From wang!elf.wang.com!ucsd.edu!info-hams-relay Thu Mar 28 01:53:46 1991 remote from tosspot Received: by tosspot (1.64/waf) via UUCP; Thu, 28 Mar 91 05:18:17 EST for lee Received: from somewhere by elf.wang.com id aa01163; Thu, 28 Mar 91 1:53:45 GMT Received: from ucsd.edu by relay1.UU.NET with SMTP (5.61/UUNET-shadow-mx) id AA20312; Wed, 27 Mar 91 17:01:12 -0500 Received: by ucsd.edu; id AA01739 sendmail 5.64/UCSD-2.1-sun Wed, 27 Mar 91 11:24:41 -0800 for brian Received: by ucsd.edu; id AA01694 sendmail 5.64/UCSD-2.1-sun Wed, 27 Mar 91 11:24:23 -0800 for /usr/lib/sendmail -oc -odb -oQ/var/spool/lqueue -oi -finfo-hams-relay info-hams-list Message-Id: <9103271924.AA01694@ucsd.edu> Date: Wed, 27 Mar 91 11:24:21 PST From: Info-Hams Mailing List and Newsgroup Reply-To: Info-Hams@ucsd.edu Subject: Info-Hams Digest V91 #243 To: Info-Hams@ucsd.edu Info-Hams Digest Wed, 27 Mar 91 Volume 91 : Issue 243 Today's Topics: 2m/70cm comparison - revised chart a few fundamental questions about RF signals (2 msgs) aor 2002 scanner Could we put QSL info online? (2 msgs) Drake R4C Service Manual? DX Bulletin DX BULLETIN 14 ARLD014 (2 msgs) How do you tell one ZK1 from another? IC-24at Sale? magazines MAJOR GEOMAGNETIC STORM UPDATE #2 - 26 MARCH - STILL STORMING Test Vacuum tube question/quest (Attn: OOTs & gov't surplus fans) Send Replies or notes for publication to: Send subscription requests to: Problems you can't solve otherwise to brian@ucsd.edu. Archives of past issues of the Info-Hams Digest are available (by FTP only) from UCSD.Edu in directory "mailarchives/info-hams". We trust that readers are intelligent enough to realize that all text herein consists of personal comments and does not represent the official policies or positions of any party. Your mileage may vary. So there. ---------------------------------------------------------------------- Date: 26 Mar 91 10:54:53 GMT From: vtserf!groupw.cns.vt.edu@uunet.uu.net Subject: 2m/70cm comparison - revised chart To: info-hams@ucsd.edu Here is the chart of 2m/70cm HTs that I posted a few weeks ago. I got an Icom IC-24AT. I am done with the chart, but I will still do updates as time permits. If you have anything to add, just let me know. ================================================== Comparison chart of 2m/70cm dual-band HTs -- 26 Mar 1991 Radios included: Alinco DJ-560T, DJ-500T Kenwood TH-77A Icom IC-24AT,IC-32AT Yaesu FT-470, Reviewed in Sept 90 QST Radio DJ-560T DJ-500T TH-77A IC24-AT IC-32AT FT-470 ------------------------------------------------------ RxCov 136-165 138-174 138-174 130-180 438-450 440-450 440-450 430-450 RxSens 0.18 0.25 0.158 TxCov 140-150 140-150 144-148 440-450 440-450 430-450 FDX Yes Yes Yes Yes X-Band Yes Mod DualDsp Yes Yes No Yes CTCSS Yes Opt Yes Yes ToneSq Yes Opt Opt MemCh 40 20 42 40x2+2 20x2+2 19x2+2 DTMFmem 10x15 4x15 None 10x15 FacPwr 2.5 2.5 5W 2.3W PwrSet 2 4 2 2 Scan BM BSML BML BML Clock Yes No Saver Yes Yes Yes Yes APO Yes Yes No Yes MSR 629 629 576 RCUSA 380 464 HRO 400 519 474 AES 520 480 549 EEB 560 580 399 Acc Charg Charg Charg Case BeltClp BeltClp BeltClp Charger KbCov BeltClip Features: - Scan: B - band S - skip during band scan M - scan memory channels L - Lock out memory channels during scan - APO: Automatic power off - Saver: Battery saving monitor mode - Tone Sq: DTMF operated tone squelch - Mem Chan: channels x freq/channel + calling channels - FDX: Cross-band full duplex - X-Band: cross-band repeat - DualDisp: Dual frequency Display - FacPwr - Transmit ppower from factory, all of these units are 5W with 13.6V - PwrSet - Number of transmit power settings - MSR - Manufacturer's Suggested Retail - RCUSA - Radio Cebter USA - HRO - Ham Radio Outlet - AES - Amateur Electronics Supply - EEB - Electronic Equipment Bank Other features: The following information is based on things I have seen on the net and may not necessarily work. I have also put comments that don't fit in the chart in this section. - Kenwood TH-77A 2m section is modifiable for MARS/CAP can be modified for 118-165MHz Rx dual UHF receive - Icom IC-24AT A diode will extend UHF transmit range to 410-485 A diode will extend VHF transmit range to 138-168 Keyboard entry can enable 100-1000MHz Receive (diode has to be removed on older models). A diode can be removed to allow cross-band repeat Icom IC-32AT Simple mods for RX on 138-168 and 418-458. Tx on those ranges with a bit more work. - Yaesu 470 There is a mod for transmit on 140-174 Several people have mentioned that the backlit keyboard in a nice feature. Phil Benchoff benchoff@groupw.cns.vt.edu ------------------------------ Date: 27 Mar 91 17:54:00 GMT From: news-mail-gateway@ucsd.edu Subject: a few fundamental questions about RF signals To: info-hams@ucsd.edu > Both light and radio are electromagnetic waves, > but the vast difference in frequency gives them vastly different properties. > Because of this, the technologies for generating and detecting the different > waves are so different that the similarity is hard to see. > > There's another realm between radio and light, the infrared. IR is It might be useful to add here that astronomers and atmospheric scientists frequently build heterodyne infrared receivers. Mike Mumma & colleagues at NASA/Goddard have pioneered this work. Very similar technology to heterodyne radio receivers, except for the differences of mixing and detecting. But infrared detectors are still solid state diode-type devices. So... do you call infrared RF or light? The point is that there is a somewhat smooth (or maybe I should say "piecewise continuous" for you mathematician-types) transition between RF detection and light detection. Step functions along the way, but not just one big step function between 4e10 and 5e14 Hz! And I wouldn't necessarily say that the similarities are hard to see. steve W3GRG ------------------------------ Date: 27 Mar 91 18:19:24 GMT From: mojo!chuck@mimsy.umd.edu Subject: a few fundamental questions about RF signals To: info-hams@ucsd.edu In article <7087@mace.cc.purdue.edu> dil@mace.cc.purdue.edu (Perry G Ramsey) writes: >In article <9171@plains.NoDak.edu>, kkim@plains.NoDak.edu (kyongsok kim) writes: >> I wonder if the >> same RF signal can travel either through copper wire or through air. In >> other words, is there no difference between RF signal (say, for channel >> 4) that my TV receives from the air and RF signal (say, for channel 4) >> coming from CATV company through cable? > >None at all, except that one is an electromagnetic wave traveling through >the air and the other is an alternating current traveling through a >wire. I'm sorry Perry, but you are wrong. The "signal" travelling thru the coax is an electro-magnetic wave. The only significant difference between it, and the one travelling thru the air is the speed of propagation. E-M waves travel slower in any medium other than free space. (eg. vacuum). > >Additional comments or flames welcome. >-- >Perry G. Ramsey Department of Earth and Atmospheric Sciences >dil@mace.cc.purdue.edu Purdue University, W. Lafayette, IN USA >perryr@vm.cc.purdue.edu *** IMAGINE YOUR LOGO HERE ****** > Ten thousand low-lifes a day read this space. Chuck Harris - WA3UQV chuck@eng.umd.edu ------------------------------ Date: 27 Mar 91 17:32:32 GMT From: news-mail-gateway@ucsd.edu Subject: aor 2002 scanner To: info-hams@ucsd.edu From: Colin Schmutter I am using an aor 2002 scanner to receive polar orbiting fax signals. While reception is satisfactory, the IF bandwidth appears to be too wide in wideFM mode. Strong local signals are breaking through into the IF strip causing interference and distortion. The IF bandwidth is rated at +/- 50 khz. I think that by narrowing the IF bandwidth in WFM mode the problem may be reduced. Does anyone know of mods to do this and of other mods to improve fax reception? COLIN SCHMUTTER NETWORK TECHNICIAN, COMPUTER RESOURCES : 432 - 8858 ------------------------------ Date: 26 Mar 91 15:36:41 GMT From: dog.ee.lbl.gov!hellgate.utah.edu!fcom.cc.utah.edu!cc.utah.edu!cc.usu.edu!slp9m@ucsd.edu Subject: Could we put QSL info online? To: info-hams@ucsd.edu Information from the W6GO/K6HHD QSL Managers List is currently available on packet clusters and the publishers have said that this will be permitted as long as subscriptions to the List do not drop off. I wonder if it would also be possible to put this info on the net, under the same type of arrangement. Simply posting the List would definitely not be the way to go as it would chew up big time bandwidth and even the budding, young, over enthusiastic DXer who is spending 18 to 20 hours per day on the air and has zero countries confirmed will not use 1% of the information contained in any one issue. The way to go would be a mail based, or even an interactive server. I am not in a position to put such a thing together, but would be willing to volunteer any assistance I am able to render to such a project. I really do not know if this is even a realistic idea. I would like to see some comments from the net. (Also, any other volunteers??) ############################################################################ # Scott E. Parker WA7VYJ # INTERNET: SLP9M@cc.usu.edu # # Center for Atmospheric & Space Sciences # Twisted pair: (801) 750-2975 # # Utah State University # Home: (801) 753-3924 # # Logan, UT 84322-4405 # # ############################################################################ ------------------------------ Date: 27 Mar 91 15:07:11 GMT From: pa.dec.com!rust.zso.dec.com!shlump.nac.dec.com!mast.enet.dec.com!reisert@decwrl.dec.com Subject: Could we put QSL info online? To: info-hams@ucsd.edu RE: W6GO list I think the machine hosting the data would have to pay a subscription fee to W6GO, or something like that. I'm sure he doesn't provide this service to the PacketCluster (tm) users (sysops) for free. I guess people on the net could contribute to a fund, though, much like the Buckmaster tapes that Rusty puts together. - Jim AD1C =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= "The opinions expressed here in no way represent the views of Digital Equipment Corporation." James J. Reisert Internet: reisert@mast.enet.dec.com Digital Equipment Corp. UUCP: ...decwrl!mast.enet!reisert 146 Main Street Voice: 508-493-5293 Maynard, MA 01754 FAX: 508-493-???? ------------------------------ Date: 26 Mar 91 05:51:07 GMT From: hpda!hpcupt1!hprnd!hprpcd!stan@hplabs.hpl.hp.com Subject: Drake R4C Service Manual? To: info-hams@ucsd.edu For manuals, parts (some), and service (yes they still service them), try R.L.Drake Co. 540 Richard St. Miamisburg, Ohio 45342 (513) 866-3211 I got a manual for my R4C from them last fall and yes, the owners manual is the service manual! Also, don't forget to give them your serial number. According to the guy I talked to, there are 4 diferent versions of the R4-C, depending on when it was made and what engineering changes were incorporated. Good luck ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~ Stan Witherspoon ~ Disclaimer ~ ~ Systems Technology Division ~~~~~~~~~~~~~~~~~~~~~~~~ ~ Hewlett Packard Company ~ These are my ~ ~ 8010 Foothills Blvd. ~ personal opinions ~ ~ Roseville Ca. 95678 ~ and do not represent ~ ~ Phone: (916) 785-5071 ~ the views of anyone ~ ~ RF: N6SCE ~ or anything else ~ ~ Email: ucbvax!hplabs!hprpcd!stan ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ------------------------------ Date: 27 Mar 91 15:52:22 GMT From: news-mail-gateway@ucsd.edu Subject: DX Bulletin To: info-hams@ucsd.edu The Ohio/Penn Dx Packet Cluster DX Bulletin No. 003 (OPDX.003) March 25, 1991 Editor Tedd Mirgliotta, KB8NW Provided by BARF-80 BBS Cleveland, Ohio Online at 216-237-8208 2400/1200/300 8/N/1 Thanks to the Northern Ohio Amateur Radio Society, Northern Ohio DX Association K8AAI, W8GMH, WB3LHD, KA8MVJ, WK3N, NQ8S, K8YSE and K8YVI for the following DX information. 5X, Uganda. It was reported, on the INDEXA net on 14236 KHz, John, PA3CXC, will be in 5X land in about 2 weeks. He will try to get a license there and active 5X. (KYFC) 7O, YEMEN. Great News. It seems the logs for the 7O1AA Dxpedition were found intact at the home of 9K2CS in Kuwait. The logs have been sent to Gabby, DL2BCH, and anyone that hasn't received their 7O1AA cards should resubmit to DL2BCH. 9K, KUWAIT. 9K2SH has been active again on 21335 around 2200Z and he has also reported that the Kuwaiti QSL Bureau was totally destroyed in Kuwait city. Records, cards and logs were all lost. By the time you read this, 9K2SH may be in A7 land. QSL 9K2SH to OE6EEG. 9N, NEPAL. Denny, GW3CDP, expects Father Moran, 9N1MM, to begin showing up on the 21335 Net around 1400Z. During the net, Denny has been calling frequently on a daily basis for the 9N1MM. AP, PAKISTAN. John, K8YSE, reports a sure way to receive QSL cards from AP2JZB by using the K2EWB method. He said to send the cards in an unsealed envelope to Pakistan, but send a donation to K2EWB. John said he received his cards direct from Pakistan with an acknowledgment that he had sent a donation to K2EWB. Turn around time for the cards were 7 weeks. CY9, ST. PAUL ISLAND. Pat, FP5DX, QSL Manager for the CY9CF operation of last year says the QSL cards are at the printers now. About 12,000 QSO's were made and cards will be going out as soon as they reach Pat sometime in April. EP, IRAN. There was a report on March 18 of a station signing EP2HZ on 14156.8 at 0357Z. Even if this station is in Iran, their government still has a ban on Amateur Radio and the DXCC Desk will not accept this operation. ET, ETHIOPIA. JACK, W4IBB, signing ET2A, continues to be very active. Jack was heard saying he will be leaving on March 30, but would return sometime in May. He said he will try operating some CW upon his return. K8YVI also heard Jack mention logs were being sent stateside on March 12. Rumors still persist that John, PA3CXC, will be activating this one. FT4W, CROZET. FT4WC has become active again and showing up on a net on 28510 KHz around 1530 to 1700 UTC. QSL via F6GVH. PY0, ST. PETER & ST. PAUL ROCKS. Info from Claude, PY4VB, stated the operations on 10 meters on FEB. 14 and MAR. 18 by a PY0PT were undoubtedly the work of a SLIM. The operator Bill, gave his QSL route as P.O. Box 63003, 02699 Sao Paulo Brazil. Claude is attempting to find out who belongs to the Box number. For now save your money and WFWL. As for the real Dxpedition, JH1AJT, DJ9ZB, PY5AKW, PS7KM and PY4VB will active PY0 for 10 days beginning May 9-11. They will have 2 stations on the air at the same time and will operate 6-80 meters, including the WARC bands, on SSB and CW. They will try for 160 meters and RTTY if possible. Due to the extreme heat and humidity, logging will be done on paper instead of a computer. Each operator will have their own callsign similar to the Trindade operation. PY4VB says the QSL route will be PS7KM. S2, BANGLADESH. Prior to publication, Bruce, N8JDX, heard Jim Smith, VK9NS, state he was heading for S2 Friday. Jim will be meeting and talking with Bangladesh official Saturday March 23. Jim is skeptical about the talks, but reminds us to keep listening to the HIDXA Net on 14222 KHz for further information. XQ0X, SAN FELIX. QSL Manager Mickey, CE3ESS, for the XQ0X operation has stated he has the logs up to the 21st of January and cards for those QSO's will be out around the end of the month. The first 10,000 cards that QSL will receive an actual photograph. A QSL card with the photograph printed on it will be used after they run out of the photo QSL's. (FCFS) ZS8, MARION ISLAND. Reports say, Gerard, ZS8MI, will concluded his one-year stint on Marion Island this coming May. Recent QSN reports has him on 3790 KHz at 0215Z, 14226 KHz at 2330Z, and 14020 at 1300Z. QSL to: G. Everett, Box 13077, Jacobs 4026, Natal, R.S.A IN THE MAIL. The following QSL cards that have been received in the mail: C9EC, XU0AA, 5R8GN, 7O8AA and 9U5QL. DAYTON REMINDER: Don Search, W3AZD, the ARRL DXCC Manager, will be at the Dayton Hamvention to check QSL cards for DXCC endorsements. Don said he will only check 25 QSL cards for endorsements. This will help process cards for more people than in the past. Good Luck on DX de KB8NW Excerpts and distribution of The OPDX Bulletin are granted as long as OPDX/BARF80 receive credit. To contribute DX info, call BARF-80 BBS online at 216-237-8208 2400/1200/300 and leave a message with the Sysop or send a message via packet to KB8NW @ WA8BXN.OH.USA.NA 73 -- marty -- nr3z skitch@nadc.navy.mil ------------------------------ Date: 27 Mar 91 13:59:43 GMT From: sdd.hp.com!spool.mu.edu!uwm.edu!linac!att!cbfsb!cbnewsb.cb.att.com!feg@ucsd.edu Subject: DX BULLETIN 14 ARLD014 To: info-hams@ucsd.edu In article <1991Mar22.185147.5028@n8emr.uucp> gws writes: > >YEMEN, 70. Gabbie, DL2BCH, tells us that she has the logs for >7O1AA. She asks us to remind you that German airmail postage is >almost two dollars. Cards for the operation of 7O8AA are currently >being received here. Both 9K2CS and F6EXV plan to be in Dayton >the end of April, 1991. Who is the QSL mgr for 7O8AA? Forrest Gehrke feg\@dodger.att.com ------------------------------ Date: 27 Mar 91 15:02:52 GMT From: deccrl!news.crl.dec.com!shlump.nac.dec.com!mast.enet.dec.com!reisert@decwrl.dec.com Subject: DX BULLETIN 14 ARLD014 To: info-hams@ucsd.edu In article <1991Mar27.135943.25364@cbfsb.att.com>, feg@cbnewsb.cb.att.com (forrest.e.gehrke) writes... > >Who is the QSL mgr for 7O8AA? Paul, F6EXV. He has supposedly mailed all US cards by now (I got mine). - Jim AD1C =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= "The opinions expressed here in no way represent the views of Digital Equipment Corporation." James J. Reisert Internet: reisert@mast.enet.dec.com Digital Equipment Corp. UUCP: ...decwrl!mast.enet!reisert 146 Main Street Voice: 508-493-5293 Maynard, MA 01754 FAX: 508-493-???? ------------------------------ Date: 26 Mar 91 15:25:04 GMT From: dog.ee.lbl.gov!hellgate.utah.edu!fcom.cc.utah.edu!cc.utah.edu!cc.usu.edu!slp9m@ucsd.edu Subject: How do you tell one ZK1 from another? To: info-hams@ucsd.edu If you work a ZK1 you cannot find a QTH for in the callbook, is there any way to tell, after the fact, whether you've worked the North Cooks or South Cooks? I really do not want to go to the bother of extracting a QSL from a foreign manager only to find out its not the one I need. ############################################################################ # Scott E. Parker WA7VYJ # INTERNET: SLP9M@cc.usu.edu # # Center for Atmospheric & Space Sciences # Twisted pair: (801) 750-2975 # # Utah State University # Home: (801) 753-3924 # # Logan, UT 84322-4405 # # ############################################################################ ------------------------------ Date: 27 Mar 91 13:48:14 GMT From: sdd.hp.com!wuarchive!swbatl!ken@ucsd.edu Subject: IC-24at Sale? To: info-hams@ucsd.edu Just a note for anyone looking for a new dual band handheld. I've been looking at the lower cost dual-ht's and comparing features while fretting over Icom's high prices. On a random call to Madison Electronics (Houston) I found the IC-24at on special for $395. This was yesterday (3-27-91). Are we seeing a new strategy by Icom, with high normal prices and random sales? Ken - WB0QNA ------------------------------ Date: 26 Mar 91 23:22:49 GMT From: hpcc05!hpsciz!rkarlqu@hplabs.hpl.hp.com Subject: magazines To: info-hams@ucsd.edu > / hpsciz:rec.radio.amateur.misc / rtaylor@ux1.cso.uiuc.edu (Roger Taylor) / 11:10 am Mar 25, 1991 / > I have complete set of 73 Magazines, including first issue, except missing one oor two. I also have a complete set of Ham Radio. I have heard the first issue > of 73 was worth a couple hundred dollars. Anybody have any idea what these sets > might be worth and to whom? K9ALD 217-586-4958 > :wq > ---------- I think not. I tried to sell a complete run of the first 10 years of 73 including the first issue at an electronic flea market last year for $10.00 and was unable to sell them. At *least* 500 people visited my space, a lot of them hams. On the other hand, I routinely make several hundred dollars selling "junque" every time I go out there, so I know this is a valid flea market. I ended up giving them away to a friend who put them on a shelf where they have now sat for a year without being read. Good luck. Rick N6RK ------------------------------ Date: 26 Mar 91 18:45:16 GMT From: news-mail-gateway@ucsd.edu Subject: MAJOR GEOMAGNETIC STORM UPDATE #2 - 26 MARCH - STILL STORMING To: info-hams@ucsd.edu /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ GEOMAGNETIC STORM UPDATE /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ 18:30 UT, 26 March ------------- STORM UPDATE INFORMATION: Minor to severe geomagnetic storming has been observed over the past twelve to fourteen hours over middle latitudes. A period of very intense and rapid magnetic pulsations were observed between 13:00 UT and 14:10 UT. Other middle latitude stations have also reported severe storming during this period. The geomagnetic field has calmed down somewhat as of 18:00 UT, although intensification back to storm levels is expected by 24:00 UT on 26 March. Geomagnetic activity is expected to remain at minor to major storm levels for the next 24 to possibly 48 hours. Periods of major to severe storming remain possible through the UT day on 27 March. However, for the most part, minor storming should dominate. Auroral activity may be possible to observe at low latitudes tonight (27 March, UT time) for North American observers, although the phase and luminosity of the moon will make observations very difficult. VHF and/or UHF auroral backscatter may also be possible tonight over southerly middle and low latitudes. Polar and high latitude signal blackouts will continue for the next 24 hours at least. Periodic near-blackout conditions are still possible over middle latitudes as well. Current projections estimate a return to more normal propagation conditions with quieter geomagnetic and auroral activity on 28 or 29 March. Overall geomagnetic activity is declining slowly, but periods of strong activity are still evident. The best periods to attempt HF propagation are between 9 am and 3 pm local time, particularly for southerly signal paths (or northerly paths for southern hemisphere operators). Northerly paths can be heavily affected by absorption. Eastward and westward paths are unstable during these periods due to transitions in the diurnal magnetic and ionospheric activity. The next update will be posted near 06:00 UT on 27 March. The following alerts remain IN PROGRESS until at least 18:00 UT, 26 March: - MAJOR GEOMAGNETIC STORM ALERT - GEOMAGNETICALLY INDUCED CURRENT (GIC) ALERT - LOW LATITUDE AURORAL ACTIVITY ALERT - SATELLITE PROTON EVENT ALERT - POLAR CAP ABSORPTION EVENT ALERT - POLAR AND HIGH LATITUDE RADIO SIGNAL BLACKOUT ALERT The following warnings are IN PROGRESS: - POTENTIAL MAJOR SOLAR FLARE WARNING - POTENTIAL PROTON FLARE WARNING /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ ------------------------------ Date: 27 Mar 91 14:28:47 GMT From: news-mail-gateway@ucsd.edu Subject: Test To: info-hams@ucsd.edu ------------------------------ Date: 26 Mar 91 15:39:04 GMT From: dog.ee.lbl.gov!hellgate.utah.edu!fcom.cc.utah.edu!cc.utah.edu!cc.usu.edu!slp9m@ucsd.edu Subject: Vacuum tube question/quest (Attn: OOTs & gov't surplus fans) To: info-hams@ucsd.edu I have a Navy surplus LF/VLF/MF receiver (14 to 600 kHz), type AN/FRR-21. It was operational when I purchased it but has since died. I traced the problem to a dead tube. The tubes are tiny little things with wires for pins. They are held to circuit boards with clips and the "pins" are soldered onto terminal posts. I have a manual and it designates the tubes with numbers like 5899, 5636, 5719 or 5840 (it's the 5840 that's dead). Several industrial electronics catalogs list tubes with these numbers. However, I suspect, perhaps unfoundedly, that tube numbers in military equipment may not correspond to the same tube that bears that number in the world of industrial electronics. I hope I'm wrong, but before I place an order, I need to have someone who knows tell me I am wrong. It is not at all convenient for me to go to the supply house and look before I buy. Another question arises. When I had the receiver open looking for the problem, it became apparent that figuring out which "pin" was which on one of these little guys could be very difficult. Is there some trick to figuring these tiny tubes out that someone would care to share with me? If anyone has one of these things that they would like to unload, E-mail me with the details. ############################################################################ # Scott E. Parker WA7VYJ # INTERNET: SLP9M@cc.usu.edu # # Center for Atmospheric & Space Sciences # Twisted pair: (801) 750-2975 # # Utah State University # Home: (801) 753-3924 # # Logan, UT 84322-4405 # # ############################################################################ ------------------------------ Date: 27 Mar 91 17:35:05 GMT From: tgv.com!garlough@ames.arpa To: info-hams@ucsd.edu References , <21416@shlump.nac.dec.com>, <941@nddsun1.sps.mot.com>" Reply-To : trey@tgv.com (Trey Garlough) Subject : Re: Straight keys vs. iambic In article <941@nddsun1.sps.mot.com>, waters@nddsun1.sps.mot.com (Mike Waters) writes: |Actually I doubt if many people use keyboards for 40+ wpm since you also |need to receive the CW. If you are automatic at BOTH ends then RTTY etc. |is much better. In my experience most of the high speed operators use |keyers of one sort or another - usually iambic as you note. I guess it depends what is meant by "high speed operators." It takes a bit of effort to send 40 WPM with a keyer, but there are a lot of people out there doing it. It takes a lot of effort to send 50 WPM with a keyer, and even those who can send that fast have trouble sustaining those speeds. On the other hand, it is virtually effortless to send 50 WPM with a keyboard, epsecially if you start "typing ahead" while the other station is still transmitting. My observation has been that most of the *really* fast CW operators use keyboards to send and receive by ear. -- Trey Garlough, WN4KKN ------------------------------ End of Info-Hams Digest ******************************