From pashdown@slack.sim.es.com Wed Jul 7 16:19:25 1993 Received: from ES.COM by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA20191; Wed, 7 Jul 1993 16:19:25 -0400 Received: from slack ([130.187.198.23]) by orca.es.com (4.1/SMI-4.1) id AA20227; Wed, 7 Jul 93 14:19:20 MDT Received: by slack (4.1/E&S_client-ver1.5/SMI-4.1) id AA18259; Wed, 7 Jul 93 14:18:49 MDT From: pashdown@slack.sim.es.com (Pete Ashdown) Message-Id: <9307072018.AA18259@slack> Subject: 350mw Amp? To: fm-10@dg-rtp.dg.com (FM10 Mailing List) Date: Wed, 7 Jul 1993 14:18:48 -0600 (MDT) X-Mailer: ELM [version 2.4 PL21] Content-Type: text Content-Length: 452 I'm considering building the 350mw amp, but the instructions are a bit vague. For example: "Adjust C1, C2, C3, and R1 for max out. R2 can now be adjusted to 0 for max output" Why do these need to be adjusted? Isn't there a set value that will work instead of a variable? If I'm not using the amp as a driver, do I even need R2? It would be nice to see plans that boost up to half or a full watt, have set value components, and a built in filter. From acsys!acsys!mike@nntp.crl.com Wed Jul 7 23:18:04 1993 Received: from [192.215.1.101] by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA11223; Wed, 7 Jul 1993 23:18:04 -0400 Received: from acsys.UUCP by nntp.crl.com with UUCP id AA08608 (5.65c/IDA-1.5 for fm-10@dg-rtp.dg.com); Wed, 7 Jul 1993 20:17:53 -0700 Received: by NetAcsys.com (UUPC/extended 1.11v); Wed, 07 Jul 1993 19:14:21 PDT Date: Wed, 07 Jul 1993 19:14:20 PDT From: "mycal's fc email account" Message-Id: <2c3b82fd.acsys@NetAcsys.com> Organization: FutureIsNow To: fm-10@dg-rtp.dg.com Subject: news Could someone please forwared this to Alt.radio.pirate CNN came buy Dunifer's workshop last Saturday to videotape the first hour or so. The are supposed to interview him later this week. I was told that the segment will air this comming Saturday, somtime after 4 PM. It will be curious to see what kind of reaction that it stirs up. So watch for it. Stephen also said that he will be in New York City attending the National Lawyer's Guild conference. They are devoting an entire day, Sunday, to this whole issue of communications and micro power broadcasting. He is supposedly one of the speakers at this program on Sunday. Stephen is interested in having a workshop there, If any locals would like to help organize one, let me know. Other workshops scheduled soon in LA, and later in the fall there may be a tour up the west cost ending up in Seattle or Vancourver. Anyone interested? Let me know. Also the PLL stereo broadcaster is only days away from testing. take care, mycal From rocket.sanders.com!poirier@rocket.sanders.lockheed.com Thu Jul 8 08:43:17 1993 Received: from relay1.UU.NET by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA08101; Thu, 8 Jul 1993 08:43:17 -0400 Received: from spool.uu.net (via LOCALHOST) by relay1.UU.NET with SMTP (5.61/UUNET-internet-primary) id AA16695; Thu, 8 Jul 93 08:43:08 -0400 Received: from rocket.UUCP by spool.uu.net with UUCP/RMAIL (queueing-rmail) id 084135.3028; Thu, 8 Jul 1993 08:41:35 EDT Received: from snoopy.spcot (snoopy.sanders.lockheed.com) by rocket.sanders.lockheed.com (4.1/SMI-4. id AA12147; Thu, 8 Jul 93 08:37:38 EDT Date: Thu, 8 Jul 93 08:37:38 EDT From: poirier@rocket.sanders.com (Armand Poirier) Message-Id: <9307081237.AA12147@rocket.sanders.lockheed.com> Received: by snoopy.spcot (4.1/SMI-4.1) id AA02204; Thu, 8 Jul 93 08:37:29 EDT To: fm-10@dg-rtp.dg.com unsubscribe From acsys!acsys!mycal@nntp.crl.com Thu Jul 8 14:50:31 1993 Received: from [192.215.1.101] by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA23861; Thu, 8 Jul 1993 14:50:31 -0400 Received: from acsys.UUCP by nntp.crl.com with UUCP id AA12463 (5.65c/IDA-1.5 for fm-10@dg-rtp.dg.com); Thu, 8 Jul 1993 11:50:18 -0700 Received: by NetAcsys.com (UUPC/extended 1.11v); Thu, 08 Jul 1993 10:29:12 PDT Date: Thu, 08 Jul 1993 10:29:10 PDT From: "Mycal" Message-Id: <2c3c5968.acsys@NetAcsys.com> Organization: ACSYS, Inc. To: fm-10@dg-rtp.dg.com Subject: more news The following is from Stephen Dunifer. He asked me to forward it to the alt.radio.pirate groups. So I put it here, could someone do the honors of putting it on alt.radio.pirate. Check out the kits Stephen has too! --------------cut here-------------------- RECLAIMING THE AIRWAVES Using inexpensive hand built transmitters, Free Radio Berkeley and other micro power broadcasters are challenging the information stranglehold imposed by the corporate media and enforced by federal regulation. Every Sunday evening from 9 PM to 12 midnight, a broadcast is made from somewhere in Berkeley at 88.1 on the FM band. Running with an output power that varies from 5-15 watts, Free Radio Berkeley has been picked up as far away as 35th and Geary in San Francisco. Free Radio Berkeley is a First Amendment challenge to the restrictive federal regulations which only favor those with money and power. It is the contention of Free Radio Berkeley that most communities, however they may be defined, are denied their own voice. Unless one has at least $50,000 to start a 100 watt FM station, there is no way any community without those resources can have a voice. Before 1980 it was possible to apply for and receive a 10 watt Class D educational station license with very little money in the bank. Thanks to an alliance of reactionary elements who sought to suppress voices outside the mainstream and liberal elements such as the Corporation for Public Broadcasting (NPR) who sought to establish more "professional" stations (translation, more likely to be funded by corporate blood money laundered through foundations), the FCC eliminated all 10 watt station licenses as of 1980. This move prevented the 90% of the US population who do not have the monetary resources from having a voice on the FM band. Especially African Americans who are grossly underrepresented in the media. If the airwaves were not dominated by the corporate media pirates, there would be plenty of FM radio spectrum space available for all to use. Even in the congested Bay Area FM radio spectrum, there are quite a number of frequencies that would be appropriate for low power (.5 to 10 watts) community broadcast operations. Unfortunately, like so many other public resources such as old growth forests, the air waves have been hijacked and polluted by the corporate state in its relentless pursuit of profit and control of all public resources. Free Radio Berkeley is part of a growing movement of individuals and communities across the country who have set up these micro power (1 to 15 watts) broadcasting operations. Most notable of these is Black Liberation Radio, which covers a housing project area in Illinois. Black Liberation Radio has been under severe attack by both the local police and federal agencies. Despite police and federal harassment, Black Liberation Radio is on 24 hours a day offering some of the finest programs to be found anywhere on almost no budget to speak of. Very recently the FCC filed a Notice of Apparent Violation against one member of Free Radio Berkeley, Stephen Dunifer, with an attached civil fine of $20,000. Free Radio Berkeley and Stephen Dunifer are being represented by Louis Hiken from the National Lawyers Guild Committee on Democratic Communication. It is hoped that this case will result in some major precedents being set for Micro Power Broadcasting. Efforts are under way to organize the Free Communications Coalition to defend and support Micro Power Radio. Funds for legal defense will be raised through a series of benefits and public forums. Call the voice mail number (510) 464-3041 if you can help in any way with this effort. Just imagine the possibilities of having hundreds of micro power broadcasts like this across the country. Cost is not a problem since a basic station can be put on the air for around $200. With determination and purpose we can break the stranglehold on the flow of cultural and artistic expression, information and ideas in this country. Consider giving your community a voice. Very soon, inexpensive (less than $500) UHF TV transmitter designs will be available as well. Free Radio Berkeley encourages you to take up the microphone and let a thousand transmitters bloom. Your support, ideas, and involvement are essential to micro power radio flourishing. We will have a complete handbook out very soon which will cover all aspects of micro power broadcasting. Please call our voice mail number for updates on upcoming events and workshops. Our address is: Free Radio Berkeley, 1442 A Walnut St., #406, Berkeley, CA 94709 Phone # (510) 464-3041 Or, come to the FRB collective organizing meeting on Wednesday, July 21 - 7:30 PM at the Long Haul, 3124 Shattuck Ave., Berkeley For anyone on the net in the vicinity of New York City, I will there on the weekend of August 6 through the 10 or 11th. I am trying to set workshops on micro power radio on Monday & Tuesday. It looks like the Paper Tiger Folks will find a facility large enough to hold 20 or 30 people. Transmitter kits ($40 for 5 watt units) will be available as well as a book on Micro Power Broadcasting that I am working on now. I am asking a donation of $10 to $15 per person for the workshops. Hopefully that might cover my travel costs unless there is an extremely kind beneafactor(s) on the net who would like to donate to a good cause. If anyone on the net wants to order the kit send $40 (made out to cash) to the above address. The new and improved stereo kit using the Rohm BA1404 with one watt output will be available soon at a cost of $35. I have a 6 watt (requires only 1/4 to 1/2 watt input) amplifier kit which will drive a PA-1 to full power, it costs $25. Another design which will be in kit form soon is a 15 watt amplifier that only requires 1/2 watt input, cost will be about $30-$35. Stephen Dunifer -----------Cut here------------ -- --------------------------------------------------------------------------- PGP key on request. mycal@netacsys.com \ // "..unfortunately we can't control the actions // \ of everyone." President Clinton 04/20/93 No Risk, No Rush From saswlb@unx.sas.com Thu Jul 8 19:14:49 1993 Received: from lamb.sas.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA17752; Thu, 8 Jul 1993 19:14:49 -0400 Received: from mozart by lamb.sas.com (5.65c/SAS/Gateway/10-28-91) id AA22732; Thu, 8 Jul 1993 19:14:47 -0400 Received: from spruce.unx.sas.com by mozart (5.65c/SAS/Domains/5-6-90) id AA02090; Thu, 8 Jul 1993 19:14:27 -0400 Received: by spruce.unx.sas.com (5.65c/SAS/Generic 9.01/3-26-93) id AA11874; Thu, 8 Jul 1993 19:14:26 -0400 From: Bill Brideson Message-Id: <199307082314.AA11874@spruce.unx.sas.com> Subject: Re: Audio processing for FM-10 To: fm-10@dg-rtp.dg.com Date: Thu, 8 Jul 1993 19:14:25 -0500 (EDT) X-Mailer: ELM [version 2.4 PL20] Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Length: 2888 Several weeks ago Dave Brillhart asked if anyone knew of a circuit for something that would keep his FM-10 from overmodulating. I'm sorry I didn't get this written sooner. I'd suggest getting PAIA's catalog. They have a bunch of inexpensive kits; not Heathkit-quality but certainly adequate for anyone who's got a few clues about the differences between resistors and capacitors and integrated circuits. They have a mixer, a headphone distribution amp, reverb, parametric EQ, other audio stuff and a bunch of MIDI stuff in addition to a "dual limiter" and a "dual compressor". I discovered PAIA when I saw their "dual compressor" circuit featured in an article in _Electronic Musician_ magazine. It uses 5532s for buffer amps, which tells me that their quality is somewhere between 741s (ouch!) and the really nice Analog Devices amplifiers. For my intended application that was fine, although I'm going to go back through my _Audio Amateur_ back issues to hack in some better buffer stages. It's important to note that for radio broadcasting, you really need to consciously think in terms of two separate and independent gain- control operations. "Compression" reduces the dynamic range of the program so that people listening don't have to keep turning their radios down during fortissimo passages and up during pianissimo passages. For classical music one generally wants a low compression ratio (2:1 or 4:1 or so) so that most of the original dynamics are maintained, but for in-your-face rock-n-roll a ratio more in the 10:1 neighborhood keeps the level pretty constant so you "rock steady". Compression is, in general, applied to the program all the time. Limiting, on the other hand, is a very-high-ratio game to begin with because it's only supposed to protect against overmodulation of the transmitter. (The ultimate limiter is a pair of zener diodes, though that method can create lots of very nasty high-frequency energy.) For classical music, a limiter might trigger once a week, while at the other extreme a station might crank the sensitivity of their limiter so far down that it's "riding gain" and providing, in effect, very-high-ratio compression (which sounds terrible and induces listener fatigue). All that is a long way of saying that Dave is probably asking about a limiter, but I don't think it would be fair to simply respond to that focused question without including the rest of the gain-control story. PAIA Electronics, Inc. 3200 Teakwood Lane Edmond, OK 73013 405-340-6300 FAX: 405-340-6378 I have no connection with the company or its people whatsoever. -- Bill Brideson, saswlb@unx.sas.com, 919-677-8000 SAS Institute, Inc., SAS Campus Drive, Cary, NC 27513 "[The remarks] prove that the senator speaks his mind, and that he is not working with much when he does so." -- Anna Quindlen, 17JUN93 From keith@erg.sri.com Fri Jul 9 12:36:25 1993 Received: from moscow.erg.sri.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA28754; Fri, 9 Jul 1993 12:36:25 -0400 Received: by moscow.erg.sri.com (5.65/2.7davy) id AA02226; Fri, 9 Jul 93 09:36:16 -0700 Message-Id: <9307091636.AA02226@moscow.erg.sri.com> Date: Fri, 9 Jul 93 09:36:16 -0700 From: Keith Williams To: fm-10@dg-rtp.dg.com Subject: Unsubscribe From dxk10@thor.INS.CWRU.Edu Fri Jul 9 19:36:22 1993 Received: from thor.INS.CWRU.Edu by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA18606; Fri, 9 Jul 1993 19:36:22 -0400 Received: by thor.INS.CWRU.Edu (5.65b+ida+/CWRU-1.5.3-freenet) id AA02326; Fri, 9 Jul 93 19:36:16 -0400 (from dxk10 for fm-10@dg-rtp.dg.com) Message-Id: <9307092336.AA02326@thor.INS.CWRU.Edu> Date: Fri, 9 Jul 93 19:36:16 -0400 From: dxk10@po.CWRU.Edu (David Kazdan Md) To: fm-10@dg-rtp.dg.com Subject: PLL for the 1404? Reply-To: dxk10@po.CWRU.Edu (David Kazdan Md) I have been slowly hacking the 1404 kits (I prefer the DC Electronics kit) for some medical applications. The big problem is frequency stability, and I would guess that this causes most everybody problems. Has anyone tried using the 1404 as the voltage-controlled oscillator in a phase locked loop? It's difficult to crystal control the chip because it uses reactance modulation for the audio, but it does have the varactor diode built in for fine frequency adjust. With a low cutoff loop filter, perhaps that diode could be the driven element, phase locking the average transmit frequency to an external crystal oscillator either at the fundamental frequency of interest or at a divided-down one. May even be able to hack a frequency synthesizer out of it. Anyone have any experience with this? I would welcome ideas before I start breadboarding. --David -- David Kazdan, M.D., Ph.D dxk10@po.cwru.edu Department of Anesthesiology, University Hospitals of Cleveland, Ohio Amateur Radio: AD8Y From bill@tv.tv.tek.com Mon Jul 12 01:33:25 1993 Received: from relay.tek.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA02938; Mon, 12 Jul 1993 01:33:25 -0400 Received: by relay.tek.com id ; Sun, 11 Jul 93 22:28:02 -0700 Received: from soul.tv.tek.com by tektronix.TEK.COM (4.1/8.0) id AA19737; Sun, 11 Jul 93 22:25:31 PDT Received: from thd.tv.tek.com by soul.tv.tek.com with SMTP id AA25875 (5.65c.tv/IDA-1.4.4); Sun, 11 Jul 1993 22:26:42 -0700 Received: by thd.tv.tek.com (4.1/SMI-4.1(tv.tek.com)) id AA18779; Sun, 11 Jul 93 22:26:41 PDT Message-Id: <9307120526.AA18779@thd.tv.tek.com> To: dxk10@po.cwru.edu (David Kazdan Md) Cc: fm-10@tv.tv.tek.com Subject: Re: PLL for the 1404? In-Reply-To: Your message of Fri, 09 Jul 93 19:36:16 -0400. <9307092336.AA02326@thor.INS.CWRU.Edu> Date: Sun, 11 Jul 93 22:26:39 -0700 From: Bill McFadden >It's difficult to crystal control the chip because it uses reactance >modulation for the audio, but it does have the varactor diode built in for >fine frequency adjust. With a low cutoff loop filter, perhaps that diode >could be the driven element, phase locking the average transmit frequency >to an external crystal oscillator either at the fundamental frequency of >interest or at a divided-down one. May even be able to hack a frequency >synthesizer out of it. I did this years ago with a varactor-tuned FM stereo transmitter, so it should be easy to do. You are right about the loop bandwidth. Keep it low or the loop will try to compensate for the modulation and produce audible noise if the loop's reference frequency is in the FM composite passband. It doesn't matter much how long it takes to lock; you're not building a scanner, after all. I had a big problem with this on turntable rumble, which was at a very low frequency and easily disturbed the loop. I finally cured it through a combination of loop bandwidth reduction and highpass filtering of the audio. One other word of advice: use a limiter. Pre-emphasize the audio first, then run it through the limiter and to the trnsmitter (defeat the transmitter's internal pre-emphasis circuit by removing the capacitors). This will let you modulate the transmitter fully without distortion. (Limiting of the pre-emphasized audio compensates for the reduced modulation headroom at high frequencies.) Look for my "confessions of a former pirate" story soon. -- Bill McFadden Tektronix, Inc. P.O. Box 500 MS 58-639 Beaverton, OR 97077 bill@tv.tv.tek.com, ...!tektronix!tv.tv.tek.com!bill Phone: (503) 627-6920 How can I prove I am not crazy to people who are? From bill@tv.tv.tek.com Mon Jul 12 02:29:44 1993 Received: from relay.tek.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA08259; Mon, 12 Jul 1993 02:29:44 -0400 Received: by relay.tek.com id ; Sun, 11 Jul 93 23:07:11 -0700 Received: from soul.tv.tek.com by tektronix.TEK.COM (4.1/8.0) id AA20569; Sun, 11 Jul 93 23:04:38 PDT Received: from thd.tv.tek.com by soul.tv.tek.com with SMTP id AA26047 (5.65c.tv/IDA-1.4.4); Sun, 11 Jul 1993 23:05:48 -0700 Received: by thd.tv.tek.com (4.1/SMI-4.1(tv.tek.com)) id AA18917; Sun, 11 Jul 93 23:05:46 PDT Message-Id: <9307120605.AA18917@thd.tv.tek.com> To: fm-10@tv.tv.tek.com Cc: bill@tv.tv.tek.com, scumbags@tv.tv.tek.com, spear@tv.tv.tek.com, jaybe@tv.tv.tek.com, kent@tv.tv.tek.com, manlik@tv.tv.tek.com, joey@tv.tv.tek.com, steve@tv.tv.tek.com, george@tv.tv.tek.com, glenn@tv.tv.tek.com, richardg@tv.tv.tek.com, ruby@tv.tv.tek.com, snoopy@tv.tv.tek.com Subject: Confessions of a former pirate Date: Sun, 11 Jul 93 23:05:45 -0700 From: Bill McFadden Here is a reprint of a story I wrote for Panaxis's Experimental Broadcaster's Newsletter, EBN, in 1986. I have updated it with information (in brackets) that is either new or was too sensitive at the time to print. I hope that others will be inspired to post their stories. Excerpt from Experimental Broadcaster's Newsletter (Vol. 3, No. 1) STATION(s) OF THE MONTH....... #3 KNPR-AM, KHOG-AM, KHOG-FM, KCUF-FM --------------------------------------------------------------------- (Confessions of a former "Pirate") Dear EBN, I got my start in 1978 when I was a sophomore in high school. My first transmitter was a 4 transistor job that had about a 100 Ft range. It wasn't much but it got me hooked quick. I soon built a second AM transmitter using 3 tubes, a 12AX7 and 2-50C5's. Its range was about a mile. I was fortunate to get practical experience also at our school station, KBPS (1450 kHz), which also complemented my electronics training. In 1980 I began attending our State College [Oregon State]. Like most freshman I lived in a dormitory [McNary Hall]. It didn't take long to realize that the floor I lived on (known as "Hog City" or the "Hog Empire") [6th floor] was really wild 'n crazy. Seemed like a good place for a radio station. On went the transmitter. We decided to call the station KHOG for obvious reasons. It was an instant success. We got this really funny guy down the hall to be a DJ. He'd never done anything like it before, but he was a natural. We set up a request line and the phone was ringing off the hook. And, for some reason, the pretty coeds started hanging around "station headquarters"!! We signed-off at Midnight by playing the Imperial Death March from "The Empire Strikes Back" sound track. Our T-shirts emphasized the theme with the following logo: (picture of KHOG logo) (Pig in a Darth Vader helmet) (slogan reads: KHOG 840 AM THE VOICE OF THE EMPIRE) We went through three transmitters that year. Our second transmitter, built by a friend and I, used a 6DQ6 tube with a crystal. It was modulated by an audio amplifier through a 70 volt line transformer connected in series with the tube's plate voltage supply. Later my friend needed his 1 MHz crystal back (belonged to his computer) so we went back to 840 kHz after finding a new crystal. Our last transmitter was a hybrid containing IC's, transistors, and tubes (tubes reign supreme). The following year wasn't as successful because most of the good people were kicked out of the dorm for being too rowdy. Fall of 1981 marked a turning point however as we moved to FM stereo. My transmitter was a Stellatron FX-20, with an output of 20 mW it got out about 1/3 mile. I tried all kinds of schemes to boost the output power but none of them worked. It would be a few years before I knew enough about RF design to design my own VHF amplifiers. In addition to the low output power I also had a frequency drift. One day I read a construction article in RADIO-ELECTRONICS about a "Frequency Synthesized RF Signal Generator". A light bulb went on in my head "why can't I do this for my FM transmitter?". It took most of 1982 to work out the bugs but I did it. What an improvement! Crystal controlled accuracy and .1 MHz resolution using BCD thumbwheel switches. This was living! The next major improvement was in early 1983 with the addition of a power amplifier. I used a MOTOROLA MHW-592 module to get a 2 watt output. This increased the station's range to a 5 mile radius (coverage of the whole town [Corvallis, OR]). Later I changed to a Panaxis FMA-2000 (lots of adjustments, but it seemed to give me a bit more power - in part because I increased the supply voltage to 15 volts instead of 12.) The addition of a Panaxis RFI filter prior to my 1/4 wave ground-plane antenna improved matching and increased range further. I was in an apartment now [Londonderry Apt. #1, 9th & Adams] with no place for an antenna. A friend next door put it on top of his house (100 feet of buried cable.) We painted it black so it would be hard to see. The FCC would never know! In the summer of 1983 I started building a mixer with TL074 op-amps. It has 17 stereo inputs, six pots, and three stereo mixing buses (audition, pgm, cue). It wasn't finished until the end of that year. On December 9, 1983 KHOG helped out with a dance at my old dorm. Everyone brought records to my apartment. We broadcast to the dance two blocks away. The phone was tied up all evening with requests. The people would tell our "DJ" at the dance what they wanted, he would relay it to us on the phone. The dancers couldn't tell their music was being broadcast to them from a remote location! After Christmas break and on the air again for about 10 days, I received a visit from the FCC. I was in the shower so my roommates answered the door. By the time I got there they had already hidden the transmitter but forgot the amplifier, which I hid immediately. I went to greet my visitor in the next room. He was wearing a trench coat...(give me a break!). He asked to see the transmitter, so I showed him the 20 mW unit. He didn't believe that was all there was to it and wanted to see the antenna, how did he know where to find me? Someone must have turned me in. In any case, he let me off with a warning and didn't take the equipment. After he left I realized the date .... January 13th, 1984 ...FRIDAY the 13th. We came to the conclusion that we were "identified" by our telephone ring. Just as we were signing off [after the dance] the phone rang...and was picked up by the microphone. Instant confirmation that the station was located at the same place as the phone! So there I was, not supposed to go on the air, and several years of work put into it. I decided no one was getting the last laugh on me... I turned my transmitter into a senior project and got 8 hours of college credit (straight "A"'s no less). The station was off the air for 8 months until August, 1984, when a friend of mine offered to start it up again. We agreed in writing that it would be HIS responsibility, and would be located at his house. The station was renamed KCUF by the new owner but the equipment was being rented from me. When I moved from the area I took the transmitter with me. KCUF has since obtained another transmitter and is still on the air at 90.3 MHz. [No longer on the air, but operated until at least 1990.] In June, 1985, I graduated with a BS in electrical engineering. I am now working for Tektronix designing test and measurement equipment for TV stations (still hooked on broadcasting!). Two friends and I have formed TBA Productions for the purpose of starting a cable FM station. Our initial problems were lack of space on the cable for stereo, and then our proposal to use their text-only bulletin board channel brought a polite refusal a week later. A major problem is the cost of phone lines ... $120.00/month for one 8 kHz line; $350.00/month for a pair of 15 kHz lines. [Cable station was never realized, but TBA productions lives on a low-budget hobby recording studio.] My "Pirate" days are over so you can sign me: Sincerely, Bill McFadden -- Bill McFadden Tektronix, Inc. P.O. Box 500 MS 58-639 Beaverton, OR 97077 bill@tv.tv.tek.com, ...!tektronix!tv.tv.tek.com!bill Phone: (503) 627-6920 How can I prove I am not crazy to people who are? From @CMUVM.CSV.CMICH.EDU:34I2NYW@CMUVM.CSV.CMICH.EDU Tue Jul 13 16:39:34 1993 Received: from dg-webo.us.dg.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA10236; Tue, 13 Jul 1993 16:39:34 -0400 Received: from cmuvm.csv.cmich.edu by dg-webo.webo.dg.com (5.4.1/dg-webo-v1) id AA17550; Tue, 13 Jul 1993 16:39:18 -0400 Received: from CMUVM.CSV.CMICH.EDU by CMUVM.CSV.CMICH.EDU (IBM VM SMTP V2R1) with BSMTP id 3529; Tue, 13 Jul 93 16:35:21 EDT Received: from CMUVM (NJE origin 34I2NYW@CMUVM) by CMUVM.CSV.CMICH.EDU (LMail V1.1d/1.7f) with BSMTP 2082; Tue, 13 Jul 1993 16:35:21 -0400 Date: Tue, 13 Jul 93 16:33:18 EDT From: "Christopher M. Khoury" <34I2NYW@CMUVM.CSV.CMICH.EDU> Organization: Central Michigan University Subject: Getting started & DC Electronics FM-10 To: FM-10 Mailing List Message-Id: <930713.163318.EDT.34I2NYW@CMUVM> Hi everyone I recently got the DC Electronics catalog, and they have the "FM Stereo Transmitter Kit" Cat. No. SFM-II for $19.95... I am a novice/intermediate in electronics, with a great need/interest to build a FM transmitter that will broadcast legally/illegally to my area... Now, what exactly do i need beside the Transmitter kit? An amplifier, and antenna? What is the idfference between the FM-10 that Mycal mentions, and the DC Electronics kit?? Pleas help!! :)) Thanks --chris --------------------------- CHRISTOPHER KHOURY 34I2NYW@CMUVM.CSV.CMICH.EDU --------------------------- From cdimick@sim.es.com Tue Jul 13 17:16:47 1993 Received: from ES.COM by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA17364; Tue, 13 Jul 1993 17:16:47 -0400 Received: from sim.ES.COM ([130.187.170.219]) by orca.es.com (4.1/SMI-4.1) id AA13373; Tue, 13 Jul 93 15:16:32 MDT Received: by sim.ES.COM (4.1/esunix-ver1.7/SMI-4.1/esunix) id AA02386; Tue, 13 Jul 93 15:14:40 MDT From: cdimick@sim.es.com (Clint Dimick) Message-Id: <9307132114.AA02386@sim.ES.COM> Subject: Getting started & DC Electronics FM-10 To: fm-10@dg-rtp.dg.com Date: Tue, 13 Jul 1993 15:14:40 -0600 (MDT) X-Mailer: ELM [version 2.4 PL21] Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Length: 1308 > From: "Christopher M. Khoury" <34I2NYW@CMUVM.CSV.CMICH.EDU> > Organization: Central Michigan University > Subject: Getting started & DC Electronics FM-10 > > Hi everyone > > Now, what exactly do i need beside the Transmitter kit? An amplifier, > and antenna? What is the idfference between the FM-10 that Mycal > mentions, and the DC Electronics kit?? Pleas help!! :)) > Thanks --chris Welcome, Chris! First of all, I've heard that the DC Electronics kit is better than the FM-10 because of the crystal-controlled circuit. (Someone will surely correct me if I'm wrong.) Your frequency stability will be much more secured with the DC kit. Second, an amp and an antenna are about the only other things you'll need to start broadcasting; however, you may want to consider a harmonics (RF) filter to get rid of spurrious output which will interfere with other broad- cast bands (i.e. not good). Plans for these appear in the FAQ file as well as plans for a simple ground plane and dipole antenna. (I'm going to submit plans for a couple more.) Amp plans are available from Panaxis (916-534-0417), Ramsey (in FAQ file, don't have my catalog handy), and numerous other sources. (Again, I am going to submit some plans for a few other types.) Other questions? Let us know! - Clint From @CMUVM.CSV.CMICH.EDU:34I2NYW@CMUVM.CSV.CMICH.EDU Tue Jul 13 19:25:48 1993 Received: from dg-webo.us.dg.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA01507; Tue, 13 Jul 1993 19:25:48 -0400 Received: from cmuvm.csv.cmich.edu by dg-webo.webo.dg.com (5.4.1/dg-webo-v1) id AA09165; Tue, 13 Jul 1993 19:25:39 -0400 Received: from CMUVM.CSV.CMICH.EDU by CMUVM.CSV.CMICH.EDU (IBM VM SMTP V2R1) with BSMTP id 3622; Tue, 13 Jul 93 19:22:07 EDT Received: from CMUVM (NJE origin 34I2NYW@CMUVM) by CMUVM.CSV.CMICH.EDU (LMail V1.1d/1.7f) with BSMTP 2851; Tue, 13 Jul 1993 19:22:07 -0400 Date: Tue, 13 Jul 93 19:15:36 EDT From: "Christopher M. Khoury" <34I2NYW@CMUVM.CSV.CMICH.EDU> Organization: Central Michigan University Subject: Re: Getting started & DC Electronics FM-10 To: Clint Dimick , FM-10 Mailing List Message-Id: <930713.191536.EDT.34I2NYW@CMUVM> In-Reply-To: <9307132114.AA02386@sim.ES.COM> Hi everyone, Thanks to all who responded to my message... It seems everyone thinks the DC Electronics is the better choice, so I think i'll go for that one.... A few more things: I have the $3 packet from Mycal that talks about building Amps, and I have the FAQ that mentions filters... so i am going to try and follow that stuff... But i'm still a little clear,i guess , on the basics of the whole thing.. I take it i need to hook up a stereo receiver to the transmitter? I plan on speaking thru it (duh), and playing music, I will probably hook up a turntable, maybe a CD player, and if possible (is it possible?) a tape deck... and of course a microphone... I mean, where do all these things plug into? (dumb look :-))... Hopefully, i have enough electronics experience to put together the FM kit... I think i do... but, i'm still really unclear on the "basics" so if any of u can offer any advice to that, that'd be great... thanks a bunch everyone --chris --------------------------- CHRISTOPHER KHOURY 34I2NYW@CMUVM.CSV.CMICH.EDU --------------------------- From cdimick@sim.es.com Tue Jul 13 19:44:37 1993 Received: from ES.COM by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA03607; Tue, 13 Jul 1993 19:44:37 -0400 Received: from sim.ES.COM ([130.187.170.219]) by orca.es.com (4.1/SMI-4.1) id AA15906; Tue, 13 Jul 93 17:44:35 MDT Received: by sim.ES.COM (4.1/esunix-ver1.7/SMI-4.1/esunix) id AA03996; Tue, 13 Jul 93 17:42:42 MDT From: cdimick@sim.es.com (Clint Dimick) Message-Id: <9307132342.AA03996@sim.ES.COM> Subject: Re: Getting Started To: fm-10@dg-rtp.dg.com Date: Tue, 13 Jul 1993 17:42:42 -0600 (MDT) X-Mailer: ELM [version 2.4 PL21] Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Length: 934 > But i'm still a little clear,i guess , on the basics of the whole thing.. > I take it i need to hook up a stereo receiver to the transmitter? > I plan on speaking thru it (duh), and playing music, I will probably > hook up a turntable, maybe a CD player, and if possible (is it possible?) > a tape deck... and of course a microphone... I mean, where do all these > things plug into? (dumb look :-))... Uh, well it sounds like you'll be needing a mixing board for all of your source inputs. It works like this: the mixing board contains plugs for many different input sources (i.e. CD/tape decks, turntables, mic. inputs). Each of the volume levels of these sources can then be adjusted on the mixing board for a final output "mix." It's this output from the mixer that you would then connect to the transmitter's input. Without a mixing board, you'll be able to feed only one source at a time to the transmitter. - Clint From ccicpg!jmp@uunet.UU.NET Tue Jul 13 22:26:28 1993 Received: from relay2.UU.NET by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA18269; Tue, 13 Jul 1993 22:26:28 -0400 Received: from spool.uu.net (via LOCALHOST) by relay2.UU.NET with SMTP (5.61/UUNET-internet-primary) id AA28076; Tue, 13 Jul 93 22:26:35 -0400 Received: from ccicpg.UUCP by spool.uu.net with UUCP/RMAIL (queueing-rmail) id 222417.141; Tue, 13 Jul 1993 22:24:17 EDT Received: from al by ccicpg (5.67/1.14) with SMTP id AA00143; Tue, 13 Jul 93 19:12:07 -0700 Received: by al.irv.icl.com (5.64/1.14) with UUCP id AA04571; Wed, 14 Jul 93 02:12:02 GMT Date: Wed, 14 Jul 93 02:12:02 GMT From: ccicpg!al!jmp@uunet.UU.NET (Jim Paugh) Message-Id: <9307140212.4571.0@al.irv.icl.com> To: fm-10@dg-rtp.dg.com Subject: Unsubscribe Please unsubscribe me Thanks jmp@al.irv.icl.com From @mail.uunet.ca:jaywon.pci.on.ca!sizone!sdavis@pci Wed Jul 14 19:47:20 1993 Received: from uunet.ca by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA03856; Wed, 14 Jul 1993 19:47:20 -0400 Received: from pci by mail.uunet.ca with UUCP id <102368(4)>; Wed, 14 Jul 1993 19:47:15 -0400 Received: by pci.on.ca (/\==/\ Smail3.1.28.1 #28.1) id ; Wed, 14 Jul 93 18:38 EDT Received: by jaywon.pci.on.ca (V1.16/Amiga) id AA051yg; Wed, 14 Jul 93 18:01:07 EST Received: by sizone.jaywon.pci.on.ca (1.65/waf) via UUCP; Wed, 14 Jul 93 16:04:41 EDT for fm-10@dg-rtp.dg.com Message-Id: Date: Wed, 14 Jul 1993 16:00:39 -0400 Organization: SIZone, Soviet Recommunization Assoc., Toronto 416-YOU-SAW-BOB From: sdavis@sizone.jaywon.pci.on.ca (Scott Davis) To: fm-10@dg-rtp.dg.com Subject: SD-1272 in PA-1? I've borrowed a PA-1 kit from a friend, which seems to function fully.. I've been looking for parts locally to build (clone) another kit. The SD-1272 isn't availible. A motorola equivalent is produced, but nobody stocks or orders it. An NTE part is equivalent, and availible for $49.95 from one distributor.. ($50 EACH?!?! Uggh. That's insulting.) Any suggestions on where to source the sd-1272 from Ramsey's PA-1? I've mailed Mycal my money for his plans.. I hope some are included that don't rely on transistors that aren't availible to me locally at a decent price. Running at about three watts would be a great first step.. Thanks for any advice, Scott. From acsys!acsys!mycal@nntp.crl.com Wed Jul 14 19:33:06 1993 Received: from [192.215.1.101] by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA01844; Wed, 14 Jul 1993 19:33:06 -0400 Received: from acsys.UUCP by nntp.crl.com with UUCP id AA14169 (5.65c/IDA-1.5 for fm-10@dg-rtp.dg.com); Wed, 14 Jul 1993 16:31:56 -0700 Received: by NetAcsys.com (UUPC/extended 1.11v); Wed, 14 Jul 1993 11:02:01 PDT Date: Wed, 14 Jul 1993 11:01:49 PDT From: "Mycal" Message-Id: <2c444a19.acsys@NetAcsys.com> Organization: ACSYS, Inc. To: "Clint Dimick" Cc: fm-10@dg-rtp.dg.com Subject: Re: Getting started & DC Electronics FM-10 > > Welcome, Chris! First of all, I've heard that the DC Electronics kit is > better than the FM-10 because of the crystal-controlled circuit. (Someone > will surely correct me if I'm wrong.) Your frequency stability will be much > more secured with the DC kit. I don't think there is much difference in frequency stability. I haven't seen the DC Electronics kit, but I have seen the schematics. The major difference between the DC kit and the Ramsey kit, in my opinion, is that the DC kit comes with a 38khz xtal for much better and easier to set up stereo seperation, and that the Ramsey kit has a built in amplifier. The Ramsey produces about 17 times the power output than the DC kit. You could always put a 38khz xtal in the ramsey. The only reason that I don't like the DC kit is that to amplify the output, it requires one extra stage, thus an extra level of complexity. In a final note, I think that using the BA1404 for frequency generation is not the way to go. Someone should come up with a kit that uses a BA1404 for stereo composit generation feed into a fet based vco. This is the way to go. mycal -- --------------------------------------------------------------------------- PGP key on request. mycal@netacsys.com \ // "..unfortunately we can't control the actions // \ of everyone." President Clinton 04/20/93 No Risk, No Rush From edwards@PULMONARY.MED.BCM.TMC.EDU Thu Jul 15 12:13:53 1993 Received: from BCM.TMC.EDU by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA00837; Thu, 15 Jul 1993 12:13:53 -0400 Received: from PULMONARY.MED.BCM.TMC.EDU by bcm.tmc.edu (AA22416); Thu, 15 Jul 93 11:12:43 CDT Received: by PULMONARY.MED.BCM.TMC.EDU (AA09128); Thu, 15 Jul 93 11:06:15 CDT Date: Thu, 15 Jul 93 11:06:15 CDT From: John C Edwards Message-Id: <9307151606.AA09128@PULMONARY.MED.BCM.TMC.EDU> To: fm-10@dg-rtp.dg.com Greets... I just received a catalog of interesting modules for processing audio signals. The modules (mixers, compressor/limiters, (pre)amps, etc.) are pricey ($35-$100), but they are VERY small (2.9" X 1.5" X 0.5"), which would be good for portable applications. Call them and get the catalog, it's good stuff. Radio Design Labs PO Box 1286 Carpinteria, CA 93014 (805) 684-5415 (805) 684-9316 FAX Not affiliated, mind you... From @CMUVM.CSV.CMICH.EDU:34I2NYW@CMUVM.CSV.CMICH.EDU Thu Jul 15 14:23:18 1993 Received: from dg-webo.us.dg.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA17469; Thu, 15 Jul 1993 14:23:18 -0400 Received: from cmuvm.csv.cmich.edu by dg-webo.webo.dg.com (5.4.1/dg-webo-v1) id AA16150; Thu, 15 Jul 1993 14:23:08 -0400 Received: from CMUVM.CSV.CMICH.EDU by CMUVM.CSV.CMICH.EDU (IBM VM SMTP V2R1) with BSMTP id 5605; Thu, 15 Jul 93 14:19:42 EDT Received: from CMUVM (NJE origin 34I2NYW@CMUVM) by CMUVM.CSV.CMICH.EDU (LMail V1.1d/1.7f) with BSMTP 6340; Thu, 15 Jul 1993 14:19:42 -0400 Date: Thu, 15 Jul 93 14:17:29 EDT From: "Christopher M. Khoury" <34I2NYW@CMUVM.CSV.CMICH.EDU> Organization: Central Michigan University Subject: Cheap mixers and a few questions :) To: FM-10 Mailing List Message-Id: <930715.141729.EDT.34I2NYW@CMUVM> Hi again everyone, Thanks again for all the help people... Now, let me get this straight, the DC Electronics FM Transmitter does NOT have an amplifier built in? I thought the BA1404 chip had a small amplifier in it? I was planning on building mycals 350 watt one anyway... ALso, woudl one go about tuning the FM transmitter, say if i want it at 90.5 MHz or something? Also, is there any cheap mail order place that sells a cheap mixer to hook up to the FM transmitter? i'm not looking for anythign fancy, just so i can plug in a microphone and record player or something.. Thanks a lot ---christopher --------------------------- CHRISTOPHER KHOURY 34I2NYW@CMUVM.CSV.CMICH.EDU --------------------------- From cdimick@sim.es.com Thu Jul 15 15:00:29 1993 Received: from ES.COM by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA22537; Thu, 15 Jul 1993 15:00:29 -0400 Received: from sim.ES.COM ([130.187.170.219]) by orca.es.com (4.1/SMI-4.1) id AA26847; Thu, 15 Jul 93 13:00:17 MDT Received: by sim.ES.COM (4.1/esunix-ver1.7/SMI-4.1/esunix) id AA13970; Thu, 15 Jul 93 12:58:13 MDT From: cdimick@sim.es.com (Clint Dimick) Message-Id: <9307151858.AA13970@sim.ES.COM> Subject: Re: Cheap Mixers To: fm-10@dg-rtp.dg.com Date: Thu, 15 Jul 1993 12:58:13 -0600 (MDT) X-Mailer: ELM [version 2.4 PL21] Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Length: 1285 > From: "Christopher M. Khoury" <34I2NYW@CMUVM.CSV.CMICH.EDU> > Organization: Central Michigan University > Subject: Cheap mixers and a few questions :) > > Thanks again for all the help people... Now, let me get this straight, > the DC Electronics FM Transmitter does NOT have an amplifier built in? > I thought the BA1404 chip had a small amplifier in it? I was planning > on building mycals 350 watt one anyway... (I'll let Mycal or someone else answer this one as I don't have the schematics for the DC kit.) > ALso, woudl one go about tuning the FM transmitter, say if i want it at > 90.5 MHz or something? This is done with trimmer caps. Simply set your receiver to the desired frequency and set to turning the screws on the caps until you hear the carrier. That's basically all there is to it. > Also, is there any cheap mail order place that sells a cheap mixer > to hook up to the FM transmitter? i'm not looking for anythign fancy, > just so i can plug in a microphone and record player or something.. Sounds to me like a Smack Shack $70 jobbie will do the trick for you. I think this model (they have 2) has 4 channels. The $120 one has 5 with stereo pan pots and cueing capability. Of course you get what you pay for with their quality... - Clint From ac700@medina.CWRU.Edu Fri Jul 16 12:17:38 1993 Received: from po.CWRU.Edu by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA20151; Fri, 16 Jul 1993 12:17:38 -0400 Return-Path: Received: from medina.CWRU.Edu by po.CWRU.Edu with SMTP (5.65b+ida+/CWRU-1.9) id AA27291; Fri, 16 Jul 93 12:17:21 -0400 (from ac700@medina for fm-10@dg-rtp.dg.com) Received: by medina (5.61+ida+/CWRU-1.3-client) id AA06267; Fri, 16 Jul 93 12:14:17 -0400 (from ac700 for fm-10@dg-rtp.dg.com) Message-Id: <9307161614.AA06267@medina> Date: Fri, 16 Jul 93 12:14:17 -0400 From: ac700@medina.CWRU.Edu (Aaron M. Barnes) To: fm-10@dg-rtp.dg.com Subject: DC electronics kit, antennas, etc Reply-To: ac700@medina.CWRU.Edu Hello everyone. I ordered the DC Kits SMF-II for $19.95 on Tuesday. I bought it because it includes a 38kHz crystal, but is is true t he DC kit does not have an output stage? I have an unmodified Ramsey FM-10, and its output is pretty sorry, I couldnt imagine how short the DC kits range is.Does anyone have a MW output figure on the DC kit? Also, does it have 75K resistor s on the line inputs, or the 50K's the FM-10 has? On antennas, I have heard mention of using the Radio Shack cat # 15-1636 Triple Drive Directional for broadcasting.But the impeda nce of that antenna is 300ohms and I assume the DC kits output is more like 50ohms.How would I go about matching that? Would I loos e alot of signal just using a 75-300ohm TV baulan with RG-6 downl ead to the FM-10 or DC SMF-II? I dont have FTP access, and I no longer have Usenet News access, s o would some kind soul please E-Mail me the latest edition of the FM-10 FAQ? Any other info would be great, too. Thank You. -- Aaron Barnes ac700@medina.freenet.edu Catch blacked-out Browns games on WPXI-TV 11,Pittsburgh,WICU-TV 12,Erie,or WTVG-TV 13,Toledo.All youed is a large(at least 13feet)antenna and a good sign From averett@SLAC.Stanford.EDU Fri Jul 16 16:09:08 1993 Received: from SERV02.SLAC.Stanford.EDU by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA23328; Fri, 16 Jul 1993 16:09:08 -0400 Received: from SLACVM.SLAC.STANFORD.EDU (MAILER@SLACVM) by SERV02.SLAC.STANFORD.EDU (PMDF #2896 ) id <01H0M0OUCBSG000FYW@SERV02.SLAC.STANFORD.EDU>; Fri, 16 Jul 1993 13:08:44 PDT Received: by SLACVM (Mailer R2.08 R208004) id 7815; Fri, 16 Jul 93 13:08:10 PST Date: 16 Jul 1993 13:07 -0800 (PST) From: averett@SLAC.Stanford.EDU Subject: unsubscribe To: fm-10@dg-rtp.dg.com Message-Id: <01H0M0OUCV36000FYW@SERV02.SLAC.STANFORD.EDU> X-Envelope-To: fm-10@dg-rtp.dg.com Content-Transfer-Encoding: 7BIT unsubscribe me please From 71174.2735@CompuServe.COM Fri Jul 16 18:09:19 1993 Received: from ihd.compuserve.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA08880; Fri, 16 Jul 1993 18:09:19 -0400 Received: by ihd.compuserve.com (5.67/5.930129sam) id AA20959; Fri, 16 Jul 93 18:09:12 -0400 Date: 16 Jul 93 18:05:25 EDT From: Rick Harrison <71174.2735@CompuServe.COM> To: Subject: DC ELectronics kit Message-Id: <930716220525_71174.2735_DHQ90-1@CompuServe.COM> Aaron, I ordered the DC Electronics kit 2 or 3 years ago. It does not have an output amplifier. I didn't even bother to build it; I just used the crystal to modify my Ramsey FM-10 and kept the BA1404 chip as a spare. From harun@suhana.analog.ingr.com Fri Jul 16 19:41:41 1993 Received: from suhana.analog.ingr.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA21217; Fri, 16 Jul 1993 19:41:41 -0400 Received: by suhana.analog.ingr.com (5.65c/1.921207) id AA10373; Fri, 16 Jul 1993 16:44:57 -0700 From: harun@suhana.analog.ingr.com (Bustamam Harun) Message-Id: <199307162344.AA10373@suhana.analog.ingr.com> Subject: Unsubscribe To: fm-10@dg-rtp.dg.com Date: Fri, 16 Jul 93 16:44:51 PDT X-Mailer: ELM [version 07.00.00.00 (2.3 PL11)] Can you please remove me from your mailing list. I'll be moving job in a couple of weeks. Thanks. bharun@suhana.analog.ingr.com harun@suhana.analog.ingr.com From ah157@slc4.INS.CWRU.Edu Fri Jul 16 21:40:45 1993 Received: from slc4.INS.CWRU.Edu by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA22906; Fri, 16 Jul 1993 21:40:45 -0400 Received: by slc4.INS.CWRU.Edu (5.65b+ida+/CWRU-1.5.4-ins) id AA29381; Fri, 16 Jul 93 21:40:39 -0400 (from ah157 for fm-10@dg-rtp.dg.com) Message-Id: <9307170140.AA29381@slc4.INS.CWRU.Edu> Date: Fri, 16 Jul 93 21:40:39 -0400 From: ah157@cleveland.Freenet.Edu (Rob Henry) To: fm-10@dg-rtp.dg.com Subject: unsubscribe Reply-To: ah157@cleveland.Freenet.Edu (Rob Henry) unsubscribe From @CMUVM.CSV.CMICH.EDU:34I2NYW@CMUVM.CSV.CMICH.EDU Sat Jul 17 16:25:41 1993 Received: from dg-webo.us.dg.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA20364; Sat, 17 Jul 1993 16:25:41 -0400 Received: from cmuvm.csv.cmich.edu by dg-webo.webo.dg.com (5.4.1/dg-webo-v1) id AA13055; Sat, 17 Jul 1993 16:25:08 -0400 Received: from CMUVM.CSV.CMICH.EDU by CMUVM.CSV.CMICH.EDU (IBM VM SMTP V2R1) with BSMTP id 6772; Sat, 17 Jul 93 16:21:36 EDT Received: from CMUVM (NJE origin 34I2NYW@CMUVM) by CMUVM.CSV.CMICH.EDU (LMail V1.1d/1.7f) with BSMTP 7944; Sat, 17 Jul 1993 16:21:36 -0400 Date: Sat, 17 Jul 93 16:20:23 EDT From: "Christopher M. Khoury" <34I2NYW@CMUVM.CSV.CMICH.EDU> Organization: Central Michigan University Subject: $12.95 case for FM-10? To: FM-10 Mailing List Message-Id: <930717.162023.EDT.34I2NYW@CMUVM> Hi guys... I think i've decided to order the FM-10 from Ramsey. Thanks again for all the suggestions and help... Is it worth it tho to order that plastic case along with the FM-10? In the DC Electronics catalog, there are several cases that are cheaper i think.. Maybe if someone could tell me the dimensions of this, i could order a cheaper one? Every penney coutns for me now adays :) Thanks --christopher --------------------------- CHRISTOPHER KHOURY 34I2NYW@CMUVM.CSV.CMICH.EDU --------------------------- From @mail.uunet.ca:jaywon.pci.on.ca!sizone!sdavis@pci Sun Jul 18 13:44:57 1993 Received: from uunet.ca by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA29823; Sun, 18 Jul 1993 13:44:57 -0400 Received: from pci by mail.uunet.ca with UUCP id <102362(3)>; Sun, 18 Jul 1993 13:44:48 -0400 Received: by pci.on.ca (/\==/\ Smail3.1.28.1 #28.1) id ; Sun, 18 Jul 93 13:27 EDT Received: by jaywon.pci.on.ca (V1.16/Amiga) id AA056mj; Sun, 18 Jul 93 13:28:00 EST Received: by sizone.jaywon.pci.on.ca (1.65/waf) via UUCP; Sun, 18 Jul 93 12:42:24 EDT for fm-10@dg-rtp.dg.com Message-Id: <5N7V7B1w165w@sizone.jaywon.pci.on.ca> Date: Sun, 18 Jul 1993 12:36:51 -0400 Organization: SIZone, Soviet Recommunization Assoc., Toronto 416-YOU-SAW-BOB From: sdavis@SIZONE.JAYWON.PCI.ON.CA (Scott Davis) To: fm-10@dg-rtp.dg.com Subject: Stereo Seperation on my FM-10 I've been tinkering with the stereo seperation on my FM-10 for awhile now. It's hopelessly un-seperated. With only input into the right channel, I hear a nicely balanced "stereo" sound out of both channels on my receiver. I've been unable to isolate the cause of this (Serious, in my opinion!) problem. I haven't found a 38kHz crystal yet though, and I intend to order one tomorrow so that I can eliminate my worries about the stability of the silly variable cap. circuit that ramsey has left in the design. Any advice about how to test this seperation? What's the "proper" way to tune the stereo sub-carrier (Fundamental Frequency, then Sub-carrier, then stereo balance)? What does the stereo balance pot do - just regulate the loudness of each channel, for instance? Thanks - Peace, Scott. From brewer@anarky.ENET.dec.com Sun Jul 18 18:54:17 1993 Received: from mts-gw.pa.dec.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA18501; Sun, 18 Jul 1993 18:54:17 -0400 Received: by mts-gw.pa.dec.com; id AA11461; Sun, 18 Jul 93 15:50:41 -0700 Message-Id: <9307182250.AA11461@mts-gw.pa.dec.com> Received: from anarky.enet; by decpa.enet; Sun, 18 Jul 93 15:54:14 PDT Date: Sun, 18 Jul 93 15:54:14 PDT From: Tainted with Defilement To: fm-10@dg-rtp.dg.com Apparently-To: fm-10@dg-rtp.dg.com Subject: case for FM10 >I think i've decided to order the FM-10 from Ramsey. Thanks again for >all the suggestions and help... Is it worth it tho to order that plastic >case along with the FM-10? In the DC Electronics catalog, there are several >cases that are cheaper i think.. Maybe if someone could tell me the >dimensions of this, i could order a cheaper one? Every penney coutns for >me now adays :) Thanks Christopher: I'd recommend the radio shack 270-253 metal enclosure. It will take a bit longer to use, as you'll need to bore some holes and do a bit of filing, but with that, some threaded standoffs, and a remote on/off switch, you'll end up with a much nicer (and shielded) box. It fits the FM10 board quite nicely. I'd suggest also to make a hole in the top to allow adjustment of the transmit freq. adjustment coil. good luck /john From averett@gomez.phys.virginia.edu Sun Jul 18 18:40:56 1993 Received: from gomez.phys.Virginia.EDU by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA18247; Sun, 18 Jul 1993 18:40:56 -0400 Received: by BORN.PHYS.VIRGINIA.EDU (MX V3.1C) id 24104; Sun, 18 Jul 1993 18:38:54 EDT Sender: averett@gomez.phys.virginia.edu Date: Sun, 18 Jul 1993 18:38:57 EDT From: averett@THEORY.PHYS.VIRGINIA.EDU Reply-To: averett@gomez.phys.virginia.edu To: fm-10@dg-rtp.dg.com Message-Id: <0096FB23.430003E0.24104@THEORY.PHYS.VIRGINIA.EDU> Subject: unsubscribe unsubscribe me please...... From gil@Limbic.SSDL.COM Sun Jul 18 19:55:50 1993 Received: from UUCP-GW.CC.UH.EDU by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA22449; Sun, 18 Jul 1993 19:55:50 -0400 Received: from Limbic.SSDL.COM by UUCP-GW.CC.UH.EDU with UUCP id AA13890 (5.67a/IDA-1.5 for fm-10@dg-rtp.dg.com); Sun, 18 Jul 1993 18:53:36 -0500 Received: by limbic.ssdl.com id AA00186 (5.65c/IDA-1.4.4 for fm-10@dg-rtp.dg.com); Sun, 18 Jul 1993 18:39:58 -0500 From: "Gil Kloepfer Jr." Message-Id: <199307182339.AA00186@limbic.ssdl.com> Subject: Re: Stereo Seperation on my FM-10 To: fm-10@dg-rtp.dg.com (FM-10 Mailing List) Date: Sun, 18 Jul 93 18:39:55 CDT Reply-To: gil@limbic.ssdl.com In-Reply-To: <5N7V7B1w165w@sizone.jaywon.pci.on.ca>; from "Scott Davis" at Jul 18, 93 12:36 pm X-Mailer: ELM [version 2.3 PL11] > I've been tinkering with the stereo seperation on my FM-10 for awhile > now. It's hopelessly un-seperated. I had this problem when I first built my FM-10 also. Try changing R12 to a 10K resistor (instead of 47K). I don't know why it didn't work right out of the box, but this is what fixed it. -- Gil Kloepfer, Jr. gil@limbic.ssdl.com / ...!moxie!limbic!gil From mustang@sequent.com Mon Jul 19 14:52:27 1993 Received: from gateway.sequent.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA03589; Mon, 19 Jul 1993 14:52:27 -0400 Received: from crg8.sequent.com by gateway.sequent.com (5.61/1.34) id AA27529; Mon, 19 Jul 93 11:53:48 -0700 Received: by crg8.sequent.com (5.65/1.34) id AA25451; Mon, 19 Jul 93 11:52:21 -0700 From: Dennis Johnson Message-Id: <9307191852.AA25451@crg8.sequent.com> Subject: unsubscribe To: fm-10@dg-rtp.dg.com Date: Mon, 19 Jul 93 11:52:21 PDT Priority: normal X-Mailer: ELM [version 2.2 CRG PL14c] unsubscribe From acsys!acsys!mycal@nntp.crl.com Mon Jul 19 15:32:55 1993 Received: from [192.215.1.101] by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA08298; Mon, 19 Jul 1993 15:32:55 -0400 Received: from acsys.UUCP by nntp.crl.com with UUCP id AA11558 (5.65c/IDA-1.5 for fm-10@dg-rtp.dg.com); Mon, 19 Jul 1993 12:31:28 -0700 Received: by NetAcsys.com (UUPC/extended 1.11v); Mon, 19 Jul 1993 11:37:31 PDT Date: Mon, 19 Jul 1993 11:37:29 PDT From: "Mycal" Message-Id: <2c4ae9eb.acsys@NetAcsys.com> Organization: ACSYS, Inc. To: fm-10@dg-rtp.dg.com Subject: mailing list admin Please, if you want to delete yourself from the mailing list please mail to : fm-10-request@dg-rtp.dg.com Try not to send the message to the list 'cause you may not get dropped from the list and it wastes bandwidth. mycal -- --------------------------------------------------------------------------- PGP key on request. mycal@netacsys.com \ // "..unfortunately we can't control the actions // \ of everyone." President Clinton 04/20/93 No Risk, No Rush From bharun@suhana.analog.ingr.com Mon Jul 19 16:28:09 1993 Received: from suhana.analog.ingr.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA13913; Mon, 19 Jul 1993 16:28:09 -0400 Received: by suhana.analog.ingr.com (5.65c/1.921207) id AA01497; Mon, 19 Jul 1993 13:31:18 -0700 From: bharun@suhana.analog.ingr.com (Bustamam Harun) Message-Id: <199307192031.AA01497@suhana.analog.ingr.com> Subject: unsubscribe To: fm-10@dg-rtp.dg.com Date: Mon, 19 Jul 93 13:31:11 PDT X-Mailer: ELM [version 07.00.00.00 (2.3 PL11)] Please unsubscribe me. I'll be moving job in couple of weeks. Is there any other way to subscribe and unsubscribe without mailing to the whole list? bharun@suhana.analog.ingr.com harun@suhana.analog.ingr.com From averett@SLAC.Stanford.EDU Mon Jul 19 14:23:53 1993 Received: from SERV02.SLAC.Stanford.EDU by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA00824; Mon, 19 Jul 1993 14:23:53 -0400 Received: from SLACVM.SLAC.STANFORD.EDU (MAILER@SLACVM) by SERV02.SLAC.STANFORD.EDU (PMDF #2896 ) id <01H0Q3UFFP4G000I9N@SERV02.SLAC.STANFORD.EDU>; Mon, 19 Jul 1993 11:22:51 PDT Received: by SLACVM (Mailer R2.08 R208004) id 7805; Mon, 19 Jul 93 11:21:47 PST Date: 19 Jul 1993 11:21 -0800 (PST) From: averett@SLAC.Stanford.EDU Subject: unsubscribe To: fm-10@dg-rtp.dg.com Message-Id: <01H0Q3UM78HI000I9N@SERV02.SLAC.STANFORD.EDU> X-Envelope-To: fm-10@dg-rtp.rtp.dg.com Content-Transfer-Encoding: 7BIT unsubscribe From acsys!acsys!mycal@nntp.crl.com Mon Jul 19 15:33:05 1993 Received: from [192.215.1.101] by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA08303; Mon, 19 Jul 1993 15:33:05 -0400 Received: from acsys.UUCP by nntp.crl.com with UUCP id AA11554 (5.65c/IDA-1.5 for fm-10@dg-rtp.dg.com); Mon, 19 Jul 1993 12:31:21 -0700 Received: by NetAcsys.com (UUPC/extended 1.11v); Mon, 19 Jul 1993 11:24:21 PDT Date: Mon, 19 Jul 1993 11:24:16 PDT From: "Mycal" Message-Id: <2c4ae6d5.acsys@NetAcsys.com> Organization: ACSYS, Inc. To: fm-10@dg-rtp.dg.com Subject: faq repost and other stuph Hey everyone the following is a repost of the FM-10 faq. I am in the middle of making version 9. I may soon have a new amp for the FM-10 that will probibly apeal to alot of people. It is a 1 transistor, fairly simple amp, with a 3 pole filter that will connect right to the FM-10 and produce 500-800mw. Based on a 2SC1970. If all goes well this will be a perfect combo with the FM-10. Just enough power to be effective highly populated areas like college campuses, and not enough to create lots of waves. more info to follow. have fun mycal ---cut here--- Ramsey FM-10 Info by mycal@netacsys.com 8th Edition ----------- Here is a rough compilation of information about the Ramsey FM-10, and other BA1404 Stereo FM broadcasters. Some of the modifications may make your BA1404 based broadcaster illegal to use on the open airwaves in the US and Canada. Also it has been brought up that the stock Ramsey FM-10 kit may exceed FCC power limits when used with a proper antenna. The information contained in the file is in no way complete, nor do I take any responsibility for its accuracy. With that in mind, along with the above paragraph I must say : "This file for informational purposes only." About This File --------------- When I first started hacking on my FM-10, a few of us on alt.radio.pirate were exchanging information on mods to improve the range, stability and audio quality of the FM-10. After a couple of posts about filters and amps, my mailbox was swamped with requests for copies of previously posted information and other questions about the FM-10. So rather than drive myself crazy with sending a piece of info here and there, I decided to dig through my mailbox an notes and compile this file. I hope it helps. Also if anyone has more information about the FM-10 or FM transmitters, antennas, mixing equipment, programming information, stories about pirates, or anything else that falls into this realm, please send it to mycal@netronix.com. I will try to update this file as new information becomes available. Also I am working on a some Postscript files that will contain instructions on how to build some equipment that is to complex for ASCII art. You might want to check the FTPable archives every month or so. I would like to say thanx to all the people that contributed to the information in this file. The list has grown quite long, and some of the contributors would like to remain anonymous. So for now I am going to forgo all the names, if this is not up to your liking please let me know. FM-10 Mailing List ------------------ First Things First. There is now a mailing list that deals with the topic of the Ramsey FM-10 and other BA1404 based FM Stereo Transmitters. Feel free to join up and contribute. To send a message to the mailing list, send your question, reply, comment, or contribution to : fm-10@dg-rtp.dg.com To add or delete yourself from the list, send a short message with the function (add/delete/change address) along with the relevant e-mail address to: fm-10-request@dg-rtp.dg.com If you have any questions I can be reached at myca@netronix.com. FM-10 Archives -------------- Yes it is finally here, message archives of the FM10 mailing list and a place to put/find schematics, reviews, stories, etc. related to the FM-10 and other BA1404 based FM transmitters. Currently a 350mw amp plan and the BA1404 spec sheet are located there. People can FTP into dg-rtp.dg.com with user "anonymous" and password "". In the fm10 directory you'll currently find two sub-directories: incoming This is writable by everyone and this is where people should upload new stuff. msg-archives This directory will have files named according to the date they were last "sealed". The file "Current" is a running log of all EMail messages from the last "seal" date of the archives. I want to thank Ed Savage and the guys at Data General, NC for making the list and the archive possible. Snail Mail Info Packet (or Pirates Guide to FM Stereo) ------------------------------------------------------ The info packet has evolved yet again, it is now 24 pages. It includes plans for 4 amps, a 200mw, 350mw, 800mw, and 5watt. Instructions for modifying the Ramsey PA-1 for FM broadcast band operation. A section on how to design and build your own antenna. Plans for a power meter, regulated power supply, and dummy load. A block diagram showing a typical station. Spec sheet for the BA1404. FM-10 modifications. Sources for parts and info. And a more up to date design of my digitally synthesized transmitter. Loaded with schematics, board-layouts and diagrams. The price for this packet is $4 in the US and $7 overseas. Address to send the $$ to is: mycal PO Box 750381 Petaluma, CA 94975-0381 You can also use this address to send me any info that would be hard to send by email. I will trade info packets for hard copy information, email me for details. Note : this packet is in a constant state of change, more info could be added at any time. Other Places to Look -------------------- alt.radio.pirate is another good forum to find or post information on FM radio transmitter. Although you may not have pirate aspirations, many of the things talked about can benefit everyone. Other places to scan, sci.electronics and the amateur radio groups. Recommended Test Equipment -------------------------- An SWR/Power meter is a giant help, a CB to 2 meter one will suffice. Power readings will not be accurate, but can be useful for peaking. The most important part is the SWR meter, this is very important when making an antenna. A note on power meters. I recommeded the above power meters because they are inexpensive and most people that are interested in hacking a FM-10 have very limited funds. These are by no means accurate, but they will give you some idea what is going on. If you can spend the money you can get an accurate power meter that is designed for this band, but the cost is 10-15 times more. A 50ohm non inductive load is also very helpful, for low power applications a 50ohm 1/4 or 1/2 watt carbon resistor works well. This can be used to tune up your kit and amp without interfearing with anyone. Also note that you can run as much power you want, legally, as long is it doesn't radiate. A VOM is also very helpful. I would put out the extra bucks and buy one with a freq counter (if you shop around, about $60-$70). Buy the one that covers audio to 20MHz(or more). If you are serious about electronics you need one of these! Dummy load ---------- Dummy loads are great for testing, without radiating a signal. In fact you can run as much power as you want into one of these things legally! Basically you want to create a non-inductive 50-ohm load. This can be done with regular carbon resistors, or by buying pre built Amateur or CB radio loads. For low power ( <.5 watt ) an ethernet terminator works well (check temp when using if it gets very hot lower input power, if it is still cool you may be able to go up to .75 watt.) Most CB loads use a 2-watt carbon 50-ohm resistor. You can build your own, as wimpy or as studly as you want by running resistors in parallel to create 50-ohms. ie, 2 100 ohm 1/4 watt resistors will create a 1/2 watt 50 ohm load... Do not use 50 ohm wire wound resistors, they are not 50 ohms at radio frequencies. ----- ---------\ Sample Dummy Load where -****- = 50 ohm ---|--****-- / mounted in UHF connector. carbon --------- resistor ----- Ramsey's Address ---------------- If your looking to purchase a FM-10 kit and can't find one locally try : Ramsey Electronics, Inc. 793 Canning Parkway Victor, New York 14564 Phone (716) 924-4560 FAX (716) 924-4555 Ramsey FM-10 70mw output amplifier ---------------------------------- Provides almost 9db gain to bring the output power of the Ramsey FM-10 Stereo transmitter from 8mw to 70mw. Not the best design, but all parts can be found at Radio Shack! Much better designs are available at the archive site. +12v | / \ R1 *220 ohms(1/2 watt) / \ R2 9k | C2 -/\/\/\/-----------||-----> output | / | / | | / C1 | |/ <----------MPS2222A (276-2009) in --||------|\ -or- 2N4401 ^ | -> -- | | | GND currently on board * you can also use 2 440 ohm 1/4 watt resistors run in parallel I built this thing right on the underside of the FM-10 kit, C1 is the cap that currently goes to the RCA ant jack, the 9k and the 220 ohm resistor have to be bought, note that if you cannot find 220 ohms you can make one by using 2 440 ohm resistors in parallel, and that a 10k will work in place of the 9k but yields poorer performance (-5%). The MPS2222A is from Radio Shack part number 276-2009, use this part! if you substitute it for a 2N2222A you will get only half the gain. Be very careful to get the leads in the correct orientation! I have found that a 2N4401 can be used in place of the MPS2222A with a little better performance, about 5mw more. I think the 2N4401 can be found at Radio Shack too. C2 is of the same value of C1, I took the one that goes to the on board antenna pad. Important! the value for R1 that seems to be optimal is 220 ohms, but it is very close to the sat point, If the amp. seems noisy (interferes with the TV etc.) back this value off to 240 ohms. If you lower this value below 205 ohms the power meter may read higher power but this will not be true, the transistor will be spewing all kinds of junk and the power meter will mistake this for higher output (in reality the signal we want will drop considerably.) Well that's it, effective range with a good antenna should be a little over double. Ramsey PA-1 2-meter to 3-meter conversion mod --------------------------------------------- The Ramsey 2-meter amp (PA-1) can be converted for use on the FM broadcast band. The inductors L1 and L2 need to be changed to the following: L1 - Should be replaced with a 1-turn 1/4" diameter coil, Identical to the stock L2 shown in the PA-1 manual. L2 - Should be replaced with a 2 turn 1/4" diameter coil, one more turn than the above coil. Tune up should be the same as in the PA-1 Manual. Note that a FM-10 kit cannot be used to drive a PA-1 kit alone. The FM-10 kit doesn't put out enough power to turn on the PA-1 kit running class-c. So you have two options. One, you can do the "biased on" (newer kits may call this class-b) modification shown in the PA-1 manual. Doing this you can drive the PA-1 with a stock FM-10, yielding about 200-300mw of output power. Or two, you can drive the PA-1 with the output of the 70mw amp shown above and get close to a watt of output power. It should be noted here that running the PA-1 "biased on" (or class-b) produces a much cleaner output signal than running the PA-1 class-c. Also that you can run the PA-1 "biased on" while driving it with the 70mw amp, but you will show slightly less gain than in class-c. ANTENNAS -- read, read, read, read, most important! -------- Also Do you have a good antenna? I think that is the most important thing that you can do for extended range. I built a 1/4 wave ground plane using a UHF connector and 5 lengths of copper plated brazing rod (found at the local welding shop). Works great and only cost $3 dollars to make. Remember good antenna will improve you range much further than a good amp into a bad antenna. So this should be your 1st project to increase your range. use the formulas out of your FM-10 manual 234/freq=length of rod. Example : 234/88Mhz = 2.66 feet * 12 in/feet = 31.9" -or- 234/108Mhz= 2.17 feet * 12 in/feet = 26" insert the 4 ground plane rods in the 4 holes of the UHF connector, stick them through about 1/4 inch and solder. Solder the radiator in the top of the UHF connector (you may have to grind it a bit to fit.) Then bend the ground plane rods to a 45 degree angle to the radiator. There you have it a very effective antenna, just connect with a 50 ohm CB cable to your amplified Ramsey, stick the antenna in a tree or in another high place and you should have 1 miles of solid coverage (when using the above amp.). Also If you have an SWR meter you can cut the rods a little longer and start clipping the ends off a little until you get the best SWR reading. | | | | = brazing rod | | | | | ----- ----- ----- = UHF connector | - | / - \ - | | / \ | | / \ The final antenna should look like this: | ^ | | // \\ sky ground --horizon-- | v That is 1 radiator pointing strait up and 4 ground plane radials. (sorry for this extreme description, but there has been some confusion.) Be careful when you bend the brazing rod, don't break the connector. Grab the rod right below the connector with a pair of vice-grips (or the likes) and bend the brazing rod at that point. Try not to have anything metal near the radiator, this will effect the radiation pattern. The radiation pattern should look a lot like a doughnut surrounding the radiator, though deformed a bit. I have been told that you can shorten the radiator and make the ground radials longer to lower your radiation angle, but I haven't tried this, nor do I know what this would do to the antenna impedance. On The Road ----------- Old magnet mount CB antennas can make great mobile antennas, just take all of the base load out of them and cut the radiator to 1/4 wave length. If you need a longer radiator than the one that comes with the antenna use the above mentioned brazing rod. I've tried this antenna and it works great! It is better than my di-pole at home and you can drive to a high, optimal location for your broadcasts (and you can see the vans coming for miles ;'). Also with this setup you need very little coax cable. Line loss using RU-58u can be killer @ 100MHz. You could also try a 5/8 wave length antenna, this would give you 2+db gain, or almost 2x power gain on transmit. Filter design for FM Radio Transmitters. ---------------------------------------- It is very important to have a clean signal, the way 99% of all people who get busted for illegal transmitting is that the people that live around them complain about interference. Most of this interference is caused by harmonics. Filters cut down these nasties. So don't draw attention to yourself, keep everyone happy, including yourself, be clean, use a filter. When you amplify a signal, you get unwanted byproducts these are called harmonics. The show up at multiples of your starting frequency. For example if you amplify a 50MHz signal you may get echo's on 100MHz, 150MHz 200MHz, 250MHz... If you interfear with your neighbors TV, the local fire department, or anyone else, you are just asking for trouble. If you are only on the FM Band, you will hardly be noticed. ... Filter Designs -------------- (basically scaled from the charts in the ARRL handbook). Filter Design: 7 element Chebyshev I run @ 88.1 so my 1st harmonic is 176.2 This filter seems ideal. Fc 3db 20db 40db 85.8MHz 95.9MHz 116MHz 148MHz .132uh .150uh .132uh -----()()()-----()()()-----()()()----- | | | | <-50ohm - 33pF - 68pF - 68pF - 33pF 50ohm-> - - - - | | | | -------------------------------------- | --- - lowering the 33pF caps to 30pF and the 68pF caps to 62pF would make this filter sutible for higher frequencies like 100MHz. Filter Design: 5 element Chebyshev Not as good as above, but thrown in anyway. Fc 3db 20db 40db 81.8MHz 105MHz 147MHz 222MHz .128uh .128uh -----()()()-----()()()----- | | | <-50ohm - 30pF - 62pF - 30pF 50ohm-> - - - | | | --------------------------- | --- - The tuff part in the above is winding the coils. 3t of #12 wire 1/2" diam should be about .12 uh. 4t is .17 uh. (but ugh, #12 wire is big stuff). You could just use molded inductors, I have found these work well. Try to use fixed value caps, or fixed value with small 5pF trimmers. The latter works well when you have a spectrum analizer to tune there babies. I just pulled a program of a BBS that tells you how to wind inductors. Give it the value and wire size you have and it will tell you how many turns and what size. Way cool. More on this later. Very simple Chebyshev filter. ------------------------------ .15uH from FM10 >------()()()------> to antenna | | - c1 - c2 - - | | --- --- - - 88MHz 102MHz 107MHz c1 62pF 54pF 50pF c2 62pF 54pF 50pF It won't knock the harmonics down as much as the other two designs but the good thing about this one is that it uses standard off the shelf parts. The inductor is one of those molded jobbies that looks like a resistor so you can make this very small. You may stack these things to make a better filter. Each stage will knock the 1st harmonic down about 15db. Use the above cap values depending on which freq range you want to operate at. ie. if you run 87-90 use the 88MHz vals, 90-103 use 102MHz vals, and above that use 107MHz vals. Try to use fixed value parts! [Also of interest is that the FM-10 puts out about 8-9mw and the 2nd harmonic is -25db off the fundamental (frequency we are broadcasting on). The FM-4 Kit by Ramsey puts out 130mw and the 2nd harmonic is only -12db off the fundamental, which means the 2nd harmonic of the FM-4 is about as powerful as the FM-10. db is log10, ie 3db is 2 times 6db is 4 times...] FM-10 Myths ----------- There have been several myths about the FM-10 kit, the most prevalent are : 1) The FM-10 puts out 100mw of power. This is not true, or at least not true for the Ramsey FM-10's that I have tested. They put out between 8 and 12mw when driven with a 12volt supply. (note: there has been several revisions of the FM-10, it is possible that the original version put out more power, but I find even that highly unlikely since it would require another amplifier stage.) Also the FM-10 is the only low cost kit, that I have seen, with an amplifier stage. Most others have power outputs in the fraction of a mw area. 2) The FM-10's output can be cranked up by reducing the value of R9. This like the above is not true. R9 and R10 are optimized for maximum output and greatest harmonic suppression at 12volts. There are much better ways of getting more output power than to mess with this output stage. Lowering the value of R9 will most likely degrade the FM-10's performance and cause lots of interference. ============================================================================= FM-10 Improvements - -------------------- (Some from ACE magazine.) Stereo Pilot Mod ---------------- One of the first problems experienced with the FM-10 is difficulty in getting the stereo pilot to operate correctly. One solution is to replace C7 and C8 with a 38KHz crystal, this works the best and is recommended. If you cannot find a 38KHz crystal, you can make your life a whole lot easier with a couple part changes. As indicated on the Ramsey schematic, about 110pF is necessary to tune the oscillator. The components supplied to achieve this are a small fixed value capacitor (C7) and a slightly larger value trimmer (C8). Since proper setting of the trimmer occurs within a very small 'window' (about 5% of the trimmers range), it can bet difficult or impossible to adjust the pilot to 19KHz and have it stay put. This can be cured by increasing the value of c7 to 100pF and replacing c8 with a 6-50pF trimmer (Radio Shack #272-1340); a 5-30pF trimmer will do the trick. The RS trimmer will not fit the holes in the pc board; one needs to cut the leads off a spare resistor and solder them to the legs of the trimmer (just use bits of wire) to mount it on the component side of the board. On a 2nd note: I replaced c7 with a 68pF cap and found it much easyer to tune a rock solid 19KHz at the test point. Crystal Mod ----------- old set up new setup c8 c1 xtl where c1=10pF and xtl=38KHz |-||-| |-||-|\|-| | c7 | | | v8=var cap |-||-| | | c7=cap | | | | Remove C7 and C8, replace with 38KHz crystal and 10pF cap. Note that the 10pF cap and the crystal are running series and the old cap setup is running in parallel. Note: there have been good and bad reports on using the Epson crystal from digi-key. From what I have heard the crystal is quite delicate, and in at least one case the experimenter destroyed the crystal. In one of the positive case C1's 10pF cap was replaced by 2 22pF caps run in parallel, this yielded a rock solid stereo. Treble Boost Mod ---------------- Treble boost (pre-emphasis) improvement. The FM-10 appears to have been designed by someone outside the United States since it operates at the European audio standard of 50 microseconds. Receivers in the US are set up for 75 microsecond de-emphasis. R3 and R6 determine the time constant for the pre-emphasis curve. Replacing them with 75K ohm resistors (standard value 68K ohm is close enough) will result in improved audio response. A much better pre-emphasis/input circuit is shown in the July 1992 issue of "Radio Electronics". Not only do they use 75K ohm resisters in there pre-emphasis, but they filter stray RF signals by inserting a .001 cap between pin 1 (of the BA1404) and ground, and pin 18 and ground. It has been noted that the above mod may actually cause distortion on cheaper stereo receivers, since they were mass produced for the world market, they were designed for the European audio standard, which Japan and other Asian nations use too. Try it out, let me know what works for you. Anti-Drift Mod -------------- There has been quite a bit of discussion on the FM-10's frequency stability. Complaints that digital receivers cannot lock onto the FM-10's signal for any great length of time. I have used the below mod with good results (I used an N750 negative temperature compensated disc), but I have been told that Mylar or Polystyrene caps are even better. The FM-10 was designed to be inexpensive and cost-saving measures with components are inevitable. Disc ceramic capacitors are less expensive than silver-mica caps, and also much less stable. Simply replace c16 with a silver-mica, tantalum or negative temperature compensated disc (say anywhere from N150 to N750) cap of the same value. ============================================================================ Sources ------- The following is a list of sources for items used for modifications, replacement parts, or other kits and equipment used in FM radio transmitting: -- BA1404s and other FM Broadcaster kits can be found at : D.C. Electronics phone: 1-800-467-7736 & 1-800-423-0070 fax:1-602-994-1707 They sell BA1404s for $2 a piece, seems to be the best deal going. Also they Sell 38KHz crystals for $5.99, which is also a fair deal, the crystals are tiny ones like the digi-key ones, but a different brand and work without problems or the Digi-Key ones. -- -- 38KHz Crystals can be obtained by calling : Digi-Key at 1-800-DIGI-KEY. 38.000 KHz by Epson America, Digi-Key part No. is SE3314 (see notes on crystal mod on using this crystal, also note that this is a cylinder type crystal and kinda delicate. you are probably better off getting the 38KHz crystals from D.C. Electronics.) -- -- Panaxis Productions makes some very high quality FM transmitters. The last word in Transmitting, tons of kits. Panaxis Productions PO Box 130 (right next to my old place of study Paradise, CA 95967-0130. Chico State! ) (916)534-0417 Catalogs are $2, well worth it, a must have item. A little taste of there catalog : MMC1 Macromod Compander for 2:1 compression Plans $12, PCB $18, P+P 26.50, Full kit $87 SG High performance stereo generator Plans $15, PCB $13.5, P+P 26.50, Full kit $105 FME PLL FM exciter Plans $17.5, PCB $15, P+P 24.50, Full kit $129 More expensive than a FM-10 but much higher performance. -- -- A company called Progressive Concepts sells plans for a 88MHz to 108MHz amp. The power curves show that 12mw in will yield 2.5 watts, but can be driven harder for up to 12 watts. (I have not seen these plans) Plans only in U.S., $16 (a bit spendy, ouch!) Progressive Concepts 1313 N. Grand Ave. #291 Walnut, CA. 91789 -- -- If your looking to purchase a FM-10 kit (or a PA-1 kit) and can't find one locally try : Ramsey Electronics, Inc. 793 Canning Parkway Victor, New York 14564 Phone (716) 924-4560 FAX (716) 924-4555 Should be $29 -- -- The makers of the infamous BA1404 : Rohm Corporation Rohm Electronics Division 3034 Owen DR Jackson Business Park Antioch, TN 37013 PH: (615)-641-2020 (ask for someone who deals with the BA1404) FAX: (615)-641-2022 Also they have: PO Box 1399 Antioch, TN 37011-1399 ============================================================================= -- ============== ============== ============== Other Raw Info ============== ============== ============== the 2SC2570 is supposedly replaceable with an ECG10. Also I have used an MRF901 for a replacement, though tough to mount, try bottom of the pc board and connecting the whip antenna pad to ground plane. MPS901s seem to replace the 2SC2570 directly, same case too, check the pinouts though. I have also been told that MPS918s work well also. The MRF239 can be used as direct replacement for the Ramsey 2 meter PA-1 kit. Cost is around $14 bucks. Newark also has the 38KHz crystals for $2.90 ( I don't know Newark's address, this was sent to me in the mail, will try to find it though.) ------------------ Once more If you have any info, I stress "ANY", about this subject please drop me a byte or two. have fun, mycal@netacsys.com my public key is as follows: -----BEGIN PGP MESSAGE----- Version: 2.1 owEBmABn/4kAlQIFACsiwof0ygCBjeci2QEB3XkEALLCAgpRyo9jEfq6TmyNr3q/ 13k6+OEBEMWh70HzS6cyTXyD2EpUWlNLIndQN9fDNC5HZq8YgES2vrxpiZBiLiv4 ZaqFE1REtDvAHO0owW75mcZW0dczngzI2tzqaANL/05DrWezeMLGGRLzeQNeaaK0 VSxyQYX0xE736qRo3SEh =J2FX -----END PGP MESSAGE----- -- --------------------------------------------------------------------------- PGP key on request. mycal@netacsys.com \ // "..unfortunately we can't control the actions // \ of everyone." President Clinton 04/20/93 No Risk, No Rush From jkearman@arrl.org Tue Jul 20 13:42:19 1993 Received: from uu2.psi.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA28573; Tue, 20 Jul 1993 13:42:19 -0400 Received: from port6.hartford.pub-ip.psi.net by uu2.psi.com (5.65b/4.0.071791-PSI/PSINet) via SMTP; id AA06292 for fm-10@dg-rtp.dg.com; Tue, 20 Jul 93 13:42:06 -0400 Received: from jek by mgate with SMTP id AA225496 ; Tue, 20 Jul 93 12:29:10 EST Date: Tue, 20 Jul 93 17:33:39 GMT Message-Id: <8641@jek> From: jkearman@arrl.org (Jim Kearman) To: fm-10@dg-rtp.dg.com Subject: Subscribe SUBSCRIBE From acsys!acsys!mycal@nntp.crl.com Tue Jul 20 15:55:03 1993 Received: from [192.215.1.101] by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA13859; Tue, 20 Jul 1993 15:55:03 -0400 Received: from acsys.UUCP by nntp.crl.com with UUCP id AA16682 (5.65c/IDA-1.5 for fm-10@dg-rtp.dg.com); Tue, 20 Jul 1993 12:53:27 -0700 Received: by NetAcsys.com (UUPC/extended 1.11v); Tue, 20 Jul 1993 12:10:09 PDT Date: Tue, 20 Jul 1993 12:10:06 PDT From: "Mycal" Message-Id: <2c4c4311.acsys@NetAcsys.com> Organization: ACSYS, Inc. To: fm-10@dg-rtp.dg.com Subject: ftp site Fellow micro power radio ppl, Could someone with ftp access update the ftp site with the new faq, I won't have my net access fixed up right for another couple of weeks. Also I have the 800mw plans in postscript form, and I will put them at the ftp site soon. I will try to get some other info in postscript form soon, exp antenna info. have phun, mycal -- --------mycal@netacsys.com-------------------------------------------------- In the pure sciences, you are graded on how well you tell the truth. In the pure liberal studies, you are graded on how well you can lie. Everything in between is up for grabs. From cdimick@sim.es.com Tue Jul 20 16:24:11 1993 Received: from ES.COM by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA20357; Tue, 20 Jul 1993 16:24:11 -0400 Received: from sim.ES.COM ([130.187.170.219]) by orca.es.com (4.1/SMI-4.1) id AA09657; Tue, 20 Jul 93 14:24:02 MDT Received: by sim.ES.COM (4.1/esunix-ver1.7/SMI-4.1/esunix) id AA29921; Tue, 20 Jul 93 14:21:26 MDT From: cdimick@sim.es.com (Clint Dimick) Message-Id: <9307202021.AA29921@sim.ES.COM> Subject: FAQ Revision 8 To: fm-10@dg-rtp.dg.com Date: Tue, 20 Jul 1993 14:21:26 -0600 (MDT) X-Mailer: ELM [version 2.4 PL21] Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Length: 96 The revision 8 FAQ has been uploaded in the fm10/incoming directory at dg-rtp.dg.com - Clint From chinet!drx@genesis.mcs.com Tue Jul 20 17:43:20 1993 Received: from genesis.mcs.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA28819; Tue, 20 Jul 1993 17:43:20 -0400 Received: by genesis.mcs.com (/\==/\ Smail3.1.28.1 #28.2) id ; Tue, 20 Jul 93 16:36 CDT Received: by chinet (/\==/\ Smail3.1.28.1 #28.1{chinet}) id ; Tue, 20 Jul 93 16:11 CDT Message-Id: From: drx@chinet.com (Scott Whittle) Subject: unsubscribe To: fm-10@dg-rtp.dg.com Date: Tue, 20 Jul 1993 16:11:49 -0500 (CDT) X-Mailer: ELM [version 2.4 PL22] Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Length: 13 UNSUBSCRIBE From ecross@flute.calpoly.edu Thu Jul 22 15:15:57 1993 Received: from flute.calpoly.edu by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA23338; Thu, 22 Jul 1993 15:15:57 -0400 Received: by flute.calpoly.edu (AIX 3.2/UCB 5.64/4.03) id AA28697; Thu, 22 Jul 1993 11:56:14 -0700 Date: Thu, 22 Jul 1993 11:56:14 -0700 From: ecross@flute.calpoly.edu Message-Id: <9307221856.AA28697@flute.calpoly.edu> To: bharun@suhana.analog.ingr.com, fm-10@dg-rtp.dg.com Subject: Re: unsubscribe please unsubscribe me thanks ecross@oboe.calpoly.edu From cdimick@sim.es.com Thu Jul 22 18:39:56 1993 Received: from ES.COM by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA20916; Thu, 22 Jul 1993 18:39:56 -0400 Received: from sim.ES.COM ([130.187.170.219]) by orca.es.com (4.1/SMI-4.1) id AA25306; Thu, 22 Jul 93 16:39:52 MDT Received: by sim.ES.COM (4.1/esunix-ver1.7/SMI-4.1/esunix) id AA17415; Thu, 22 Jul 93 16:37:02 MDT From: cdimick@sim.es.com (Clint Dimick) Message-Id: <9307222237.AA17415@sim.ES.COM> Subject: Power Supply To: fm-10@dg-rtp.dg.com Date: Thu, 22 Jul 1993 16:37:01 -0600 (MDT) X-Mailer: ELM [version 2.4 PL21] Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Length: 853 > I've been powering the entire kit with a nine volt. Now that I'm about > ready to "seriously" experiment with amplifiers, I'm going to need a > "real" power supply. Running Mycal's 70mW amp with the nine volt > produces MUCH better sound that running it off my cheapie AC-DC adaptor.. > But not for long, as it eats current far too quickly for the nine volt. > I got a bigger battery, by running leads out my window to the car.. That > worked wonderfully, but it's a bit of a hassle for me. Any advice about > power supplies, anyone? Just put together a decent $30 kit or something? Scott, Smack Shack's 13.5V "CB Power Supply" was recommended to me and works great. I'm still using it to power my FME and 30W amp with no problems at all. (It will prevent humming, too, as it's a regulated supply.) Cost is ~$35, I think. - Clint From @mail.uunet.ca:jaywon.pci.on.ca!sizone!sdavis@pci Thu Jul 22 18:18:47 1993 Received: from uunet.ca by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA18427; Thu, 22 Jul 1993 18:18:47 -0400 Received: from pci by mail.uunet.ca with UUCP id <102008(5)>; Thu, 22 Jul 1993 18:18:21 -0400 Received: by pci.on.ca (/\==/\ Smail3.1.28.1 #28.1) id ; Thu, 22 Jul 93 17:47 EDT Received: by jaywon.pci.on.ca (V1.16/Amiga) id AA05cly; Thu, 22 Jul 93 17:31:02 EST Received: by sizone.jaywon.pci.on.ca (1.65/waf) via UUCP; Thu, 22 Jul 93 17:07:32 EDT for fm-10@dg-rtp.dg.com Message-Id: <3HX47B1w165w@sizone.jaywon.pci.on.ca> Date: Thu, 22 Jul 1993 16:59:37 -0400 Organization: SIZone, Soviet Recommunization Assoc., Toronto 416-YOU-SAW-BOB From: sdavis@sizone.jaywon.pci.on.ca (Scott Davis) To: fm-10@dg-rtp.dg.com Subject: More Seperation Help..? Thanks to Gil and Gary for their wonderful help with my stereo seperation problems.. I've still been unable to resolve my situation "perfectly" though. I attempted to tune the stereo matrix using Gary's method - an input into the left channel, and listen for silence on the right. It was a complete failure, I'm afraid. My stereo seperation pot seems to be entirely useless. It will destroy the transmitter's signal completly though, if I turn it far enough towards either extreme direction. Any thoughts, anyone, about why the pot seems to be failing? Gil's advice was to replace the 47k R12 with a 10k resistor. I did - with limited success. So, I stuck a 50k pot into R12's place, and found that I had optimal seperation with a value of about 19k. At that value, the right channel was perfect, but the left bled SLIGHTLY into the right. Enough to be picked up on the level meter lights of my tape deck - so I'm not happy. I've been powering the entire kit with a nine volt. Now that I'm about ready to "seriously" experiment with amplifiers, I'm going to need a "real" power supply. Running Mycal's 70mW amp with the nine volt produces MUCH better sound that running it off my cheapie AC-DC adaptor.. But not for long, as it eats current far too quickly for the nine volt. I got a bigger battery, by running leads out my window to the car.. That worked wonderfully, but it's a bit of a hassle for me. Any advice about power supplies, anyone? Just put together a decent $30 kit or something? Thanks, all! Scott From 71174.2735@CompuServe.COM Thu Jul 22 22:52:24 1993 Received: from ihb.compuserve.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA08271; Thu, 22 Jul 1993 22:52:24 -0400 Received: by ihb.compuserve.com (5.65/5.930129sam) id AA18943; Thu, 22 Jul 93 22:52:21 -0400 Date: 22 Jul 93 22:48:20 EDT From: Rick Harrison <71174.2735@CompuServe.COM> To: Subject: FRB kits (forwarded msg) Message-Id: <930723024819_71174.2735_DHQ34-1@CompuServe.COM> from alt.radio.pirate ===================== From: stephenpd@aol.com Subject: FM KITS FROM FREE RADIO BERKELEY Date: Tue, 20 Jul 93 03:02:41 EDT X-Received: by usenet.pa.dec.com; id AA07364; Tue, 20 Jul 93 00:03:23 -0700 X-To: alt.radio.pirate.usenet Lines: 99 FM KITS FROM FREE RADIO BERKELEY First, a word from our legal department: For educational purposes only. These kits are offered for the furtherance of one's knowledge regarding radio frequency design and principles. At all times during operation the assembled unit must be connected to a dummy load. Part 15 of the FCC rules prohibits an antenna being used with these units. All responsibilities for the ultimate use of these kits are born solely by the builder and/or operator. KITS AVAILABLE NOW ! All kits are complete and come with professionally manufactured, drilled and tinned PC boards. All coils are pre-wound. Each unit, unless specified, requires 12 volts for proper operation. Full instructions and diagrams included. 5 Watt FM Transmitter - $40 An improved version of the Panaxis 5 watt design with a much more rugged output transistor capable of producing 6-7 watts. Oscillator is a stable FET based VFO. 6 watt RF Amplifier - $25 Uses the same output transistor as above. Will produce 6 watts for 1/2 watt input drive. Easy, quick assembly. 15 watt RF Amplifier - $35 Uses a very high gain (14dB) RF transistor to boost a 1/2 watt input to 15 watts. Complete with PC Board and all required parts. 25-30 watt RF Amplifier - $35 Will produce full power with an input drive of 4-5 watts. 1/2 to 1 watt Amplifier - $18 1/2 to 1 watt output for an input power of 10 mw. Great for boosting lower power VFOs. Output Filter Kit - $5.00 A seven element low pass filter, composed of 4 coils and 3 capacitors, to flatten those harmonics. Specify cutoff frequency desired. COMING REAL SOON ! 1/2 - 1 watt Stereo Broadcast Transmitter - $35 A vast improvement over the Ramsey FM-10. It uses the BA1404 IC as a stereo modulator only to modulate a FET vfo, buffer and amp chain. Better audio input filtering and bypassing. IC voltage regulation for the 2.5 volt supply for the BA1404. A very rugged output stage and collector voltage bypassing make this unit stand out from all other transmitter designs using the BA1404 chip. Stereo Audio Processor - $Price to be determined A combined stereo generator using the BA1404 coupled with compandor ICs for compression and limiting of audio signals If you have any other particular requirements please let us know. Custom design and fabrication services are available including PC layout and production. Full CAD services as well. Proceeds from the sales of these kits go to the furtherance of micro power broadcasting, bringing a voice of empowerment to every community. Let a thousand transmitters bloom ! Payment to be made out to cash, we are still working out the bank trip. Send to: Free Radio Berkeley 1442 A Walnut St., #406 Berkeley, CA 94709 Email: stephenpd@aol.com Voice mail: (510) 464-3041 /end forwarded message/ From @CMUVM.CSV.CMICH.EDU:34I2NYW@CMUVM.CSV.CMICH.EDU Fri Jul 23 16:17:09 1993 Received: from dg-webo.us.dg.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA23300; Fri, 23 Jul 1993 16:17:09 -0400 Received: from cmuvm.csv.cmich.edu by dg-webo.webo.dg.com (5.4.1/dg-webo-v1) id AA05922; Fri, 23 Jul 1993 16:15:53 -0400 Received: from CMUVM.CSV.CMICH.EDU by CMUVM.CSV.CMICH.EDU (IBM VM SMTP V2R1) with BSMTP id 1932; Fri, 23 Jul 93 15:48:53 EDT Received: from CMUVM (NJE origin 34I2NYW@CMUVM) by CMUVM.CSV.CMICH.EDU (LMail V1.1d/1.7f) with BSMTP 7239; Fri, 23 Jul 1993 15:48:53 -0400 Date: Fri, 23 Jul 93 15:48:12 EDT From: "Christopher M. Khoury" <34I2NYW@CMUVM.CSV.CMICH.EDU> Organization: Central Michigan University Subject: FCC Part 15 rules? To: FM-10 Mailing List Message-Id: <930723.154812.EDT.34I2NYW@CMUVM> Can someone please post, or direct me to the FCC Part 15 rules that are always being mentioned? I want to know what i'm getting into... thanks! Comrade chris --------------------------- CHRISTOPHER KHOURY 34I2NYW@CMUVM.CSV.CMICH.EDU --------------------------- From r.delp1@genie.geis.com Fri Jul 23 16:41:43 1993 Received: from dg-webo.us.dg.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA27499; Fri, 23 Jul 1993 16:41:43 -0400 Received: from relay2.geis.com by dg-webo.webo.dg.com (5.4.1/dg-webo-v1) id AA23793; Fri, 23 Jul 1993 09:21:25 -0400 Received: by relay2.geis.com (1.37.109.4/15.6) id AA12983; Fri, 23 Jul 93 07:43:48 +0100 From: r.delp1@genie.geis.com Message-Id: <9307230643.AA12983@relay2.geis.com> Date: Fri, 23 Jul 93 03:51:00 BST To: fm-10@dg-rtp.dg.com Subject: more news X-Genie-Id: 3115244 X-Genie-From: R.DELP1 Hello- I'm new to the Internet mail system. I'm asking you to please add my name to the list about micro power stations. I would like to learn more about building these stations... Rob From @CMUVM.CSV.CMICH.EDU:34I2NYW@CMUVM.CSV.CMICH.EDU Sat Jul 24 19:43:51 1993 Received: from dg-webo.us.dg.com by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA13802; Sat, 24 Jul 1993 19:43:51 -0400 Received: from cmuvm.csv.cmich.edu by dg-webo.webo.dg.com (5.4.1/dg-webo-v1) id AA02947; Sat, 24 Jul 1993 19:43:33 -0400 Received: from CMUVM.CSV.CMICH.EDU by CMUVM.CSV.CMICH.EDU (IBM VM SMTP V2R1) with BSMTP id 2274; Sat, 24 Jul 93 19:40:06 EDT Received: from CMUVM (NJE origin 34I2NYW@CMUVM) by CMUVM.CSV.CMICH.EDU (LMail V1.1d/1.7f) with BSMTP 9791; Sat, 24 Jul 1993 19:40:06 -0400 Date: Sat, 24 Jul 93 19:39:01 EDT From: "Christopher M. Khoury" <34I2NYW@CMUVM.CSV.CMICH.EDU> Organization: Central Michigan University Subject: FCC Rule 15 again :) To: FM-10 Mailing List Message-Id: <930724.193901.EDT.34I2NYW@CMUVM> Hi everyone... I went to my local library, and searched on the computer for FCC documents. It turns out they had at least 100+ volumes of FCC documents/cases, and I had no idea where to look... Can anyone point me to Another place to find Rule 15? or at lest the Vol. # or where it would be in.. thanks a lot! --chris --------------------------- CHRISTOPHER KHOURY 34I2NYW@CMUVM.CSV.CMICH.EDU --------------------------- From svaldez@sdcc13.UCSD.EDU Sat Jul 24 21:17:57 1993 Received: from ucsd.edu by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA00722; Sat, 24 Jul 1993 21:17:57 -0400 Received: from sdcc13.ucsd.edu by ucsd.edu; id AA21751 sendmail 5.67/UCSD-2.2-sun via SMTP Sat, 24 Jul 93 18:17:53 -0700 for fm-10@dg-rtp.dg.com Received: by sdcc13.UCSD.EDU (5.60/UCSDGENERIC2) id AA23646 for fm-10@dg-rtp.dg.com; Sat, 24 Jul 93 18:17:47 PDT From: svaldez@sdcc13.UCSD.EDU (Steve Valdez) Message-Id: <9307250117.AA23646@sdcc13.UCSD.EDU> Subject: Re: FCC Rule 15 again :) To: 34I2NYW@CMUVM.CSV.CMICH.EDU (Christopher M. Khoury) Date: Sat, 24 Jul 93 18:17:46 PDT Cc: fm-10@dg-rtp.dg.com In-Reply-To: <930724.193901.EDT.34I2NYW@CMUVM>; from "Christopher M. Khoury" at Jul 24, 93 7:39 pmMailer: ELM [version 2.3 PL11] > > Hi everyone... > > I went to my local library, and searched on the computer for FCC documents. > It turns out they had at least 100+ volumes of FCC documents/cases, and > I had no idea where to look... Can anyone point me to Another place > to find Rule 15? or at lest the Vol. # or where it would be in.. > > thanks a lot! > look for the "code of federal regulations" (CFR) Title 47 (communications) part 15. The latest edition (I've seen) has a spine half in dark green half in white - they are half-page size volumes. Some applicable rules: 15.209 : general limits 15.221 : AM broadcasts (includes school campus ruling) 15.239 : FM broadcasts. to summarize: - your signal confined within 200kHz window of your frequency. (or, +-100kHz from desired) - maximum 250uV/m at 3m in that 200kHz window (your frequency is in the center) - outside of 200kHz window read 15.209 From white@sleepy.ctstateu.edu Mon Jul 26 14:29:52 1993 Received: from sleepy.ctstateu.edu by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA19454; Mon, 26 Jul 1993 14:29:52 -0400 Received: by sleepy.ctstateu.edu (5.57/Ultrix3.0-C) id AA21324; Mon, 26 Jul 93 14:33:31 -0400 Date: Mon, 26 Jul 93 14:33:31 -0400 From: white@sleepy.ctstateu.edu (Harry White) Message-Id: <9307261833.AA21324@sleepy.ctstateu.edu> To: fm-10@dg-rtp.dg.com Subject: Ready to buy the 1st kit...suggestions, please. Hi FM-10ers, I've read the FAQ, browsed the archives, got some catalog pages FAXed to me by Ramsey, DC, and Panaxis. I'm not sure which way to go... FM-10 @ $30 by Ramsey or SFM II @ $20 by DC. It appears that you can't buy anything but plans from Panaxis (export only?) Any help appreciated. Harry From white@sleepy.ctstateu.edu Mon Jul 26 21:41:12 1993 Received: from sleepy.ctstateu.edu by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA11689; Mon, 26 Jul 1993 21:41:12 -0400 Received: by sleepy.ctstateu.edu (5.57/Ultrix3.0-C) id AA21955; Mon, 26 Jul 93 21:44:55 -0400 Date: Mon, 26 Jul 93 21:44:55 -0400 From: white@sleepy.ctstateu.edu (Harry White) Message-Id: <9307270144.AA21955@sleepy.ctstateu.edu> To: fm-10@dg-rtp.dg.com Subject: What the hell is an FM oscillator? Ah yes, more confusion from my ignorant mind ... What is the PLL Direct FM Oscillator? How does it differ from an exciter? From a Stero Generator? What I'm really asking is how do all of thse sub-units integrate into the overall "transmitter" unit? Gee, 3 years in community radio, and I am just beginning to realize how little we DJs know about the broadcast hardware (duh, what do you mean I've been on the air for 3 hours with the carrier switch off?) :) Thanks... Dissertations welcome... Harry From @mail.uunet.ca:jaywon.pci.on.ca!sizone!sdavis@pci Tue Jul 27 03:09:17 1993 Received: from uunet.ca by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA29649; Tue, 27 Jul 1993 03:09:17 -0400 Received: from pci by mail.uunet.ca with UUCP id <102414(2)>; Tue, 27 Jul 1993 03:09:02 -0400 Received: by pci.on.ca (/\==/\ Smail3.1.28.1 #28.1) id ; Mon, 26 Jul 93 23:42 EDT Received: by jaywon.pci.on.ca (V1.16/Amiga) id AA05hpn; Mon, 26 Jul 93 22:31:07 EST Received: by sizone.jaywon.pci.on.ca (1.65/waf) via UUCP; Mon, 26 Jul 93 21:46:54 EDT for fm-10@dg-rtp.dg.com Message-Id: Date: Mon, 26 Jul 1993 21:38:19 -0400 Organization: SIZone, Soviet Recommunization Assoc., Toronto 416-YOU-SAW-BOB From: sdavis@sizone.jaywon.pci.on.ca (Scott Davis) To: fm-10@dg-rtp.dg.com Subject: FM10 Quick *?* Theory questions.. Okay, so I've just about reached my limits with tinkering with the seperation on my FM10. It's good enough, I suppose, for me, for now. :) I finally decided to go with Gil's suggestion - replacing the 47k resistor off pin 13 (?) of the BA1404 with a 10k resistor.. I found 18k to be optimal for my kit, actually. What is that little piece of circuitry supposed to do? I've stared with my slightly educated eyes at the schematic for two days now, and the best I can figure is that the hardware around pins 12, 13 and 14 all regulate the amount of signal being given to the 1404's internal modulator. *?* Is that guess even close? What does it all do? I can't find mention of it anywhere in the manual, and most of the ARRL and other books I've looked in don't have transmitter designs close enough to allow me to compare it to another *better* documented transmitter. My stereo seperation pot counts at ~80k ohms, as compared to the 100k that the schematic in the FM10 manual calls for. I faked it to 100k, with no difference. My pot still seems entirely useless. phuck. Anyone built that 'slim jim' antenna that's mentioned in a.r.p? It looks simple, durable and cheap.. exactly what I'm looking for. I've got the parts lying around. I'll piece one together next weekend, and let you know how my experiences go with it. Thanks, Peace, Scott. From white@sleepy.ctstateu.edu Tue Jul 27 20:13:40 1993 Received: from sleepy.ctstateu.edu by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA25613; Tue, 27 Jul 1993 20:13:40 -0400 Received: by sleepy.ctstateu.edu (5.57/Ultrix3.0-C) id AA23509; Tue, 27 Jul 93 20:16:58 -0400 Date: Tue, 27 Jul 93 20:16:58 -0400 From: white@sleepy.ctstateu.edu (Harry White) Message-Id: <9307280016.AA23509@sleepy.ctstateu.edu> To: fm-10@dg-rtp.dg.com Subject: MicroRadio Workshops in NYC 8/7 & 8/9 Cc: white@sleepy.ctstateu.edu From stephenpd@aol.com Tue Jul 27 13:41:38 1993 Received: by aol.com (16.8/16.2) id AA09818; Tue, 27 Jul 93 13:30:19 -0400 From: stephenpd@aol.com X-Mailer: America Online Mailer Sender: Errors-To: Reply-To: Message-Id: <9307271331.tn13419@aol.com> To: white@sleepy.ctstateu.edu Date: Tue, 27 Jul 93 13:31:57 EDT Subject: Re: NYC workshop & kits Status: RO Harry, I plan on having at least 25 kits with me, hopefully that will be enough. The book most likely will not be finished by then, but there will be plenty of reference material available. Pre-registration is not required nor is advance payment. The first half of the workshop covers the basic - antennas, transmitters, audio and legal aspects. The second half deals with the actual construction of the 5 watt kit and the generalities of electronic construction. Following is a description and schedule for the workshops. If you could post it on other BBS's in the area I would appreciate it. COMING TO NEW YORK CITY COMMUNITY EMPOWERMENT THROUGH MICRO POWER FM BROADCASTING WORKSHOPS ON HOW TO PUT YOUR OWN LOW WATTAGE FM STATION ON THE AIR SATURDAY, AUGUST 7 ********* 11 AM TO 4 PM MONDAY, AUGUST 9 ********* 7 PM TO 10 PM 5 WATT FM TRANSMITTER KITS WILL BE AVAILABLE AT $40 EACH A DONATION OF $0 TO $20 IS REQUESTED AT THE OFFICES OF PAPER TIGER TELEVISION, 339 LAFAYETTE, NEW YORK CITY CALL (212) 420-9045 for further information. As part of a growing national and international movement to take the airwaves back from the corporate media pirates, who have stolen yet another resource of the people, these workshops will focus on how to put your own liberation radio voice on the air. Hands on instruction will be provided for the assembly of the FM transmitter kits and other components. Workshops will be lead by Stephen Dunifer from Free Radio Berkeley in Berkeley CA. Stephen and lawyers from the National Lawyers Guild Committee on Democratic Communications (NLGCDC) are currently fighting an attempt by the FCC to impose a $20,000 fine on Stephen for alleged illegal broadcasts. It is the contention of Free Radio and the NLGCDC that communications is both a constitutional and a human right. Meanwhile, Free Radio Berkeley continues to be on the air every Sunday night from 9 PM to 12 midnight. Stephen is a long time activist who is using his skills as an electronics and computer systems engineer to help liberate the airwaves by designing transmitters and teaching people how to put their own stations together. The Monday workshop is a shortened version of the Saturday workshop Stephen Dunifer can be contacted at: Free Radio Berkeley, 1442 A Walnut, St. #406, Berkeley, CA 94709 (510) 464-3041 Email address via internet: stephenpd@aol.com Thanks, Stephen Dunifer If anyone from FM-10 is going, drop me a note. I'll be there! Peace Harry From kendelm@GAS.uug.Arizona.EDU Wed Jul 28 13:54:46 1993 Received: from argon.GAS.UUG.Arizona.EDU by dg-rtp.dg.com (5.4.1/dg-rtp-proto) id AA29450; Wed, 28 Jul 1993 13:54:46 -0400 Received: by argon.GAS.uug.Arizona.EDU (4.1/Argon-MX-1.4) id AA20442; Wed, 28 Jul 93 10:54:41 MST Date: Wed, 28 Jul 93 10:54:41 MST From: kendelm@GAS.uug.Arizona.EDU (kendel m mccarley) Message-Id: <9307281754.AA20442@GAS.uug.Arizona.EDU> To: fm-10@dg-rtp.dg.com Subject: subscribe please subscribe me to the list