From wang!elf.wang.com!ucsd.edu!info-hams-relay Mon Apr 1 18:00:25 1991 remote from tosspot
Received: by tosspot (1.64/waf)
via UUCP; Mon, 01 Apr 91 21:01:19 EST
for lee
Received: from somewhere by elf.wang.com id aa22842; Mon, 1 Apr 91 18:00:24 GMT
Received: from ucsd.edu by relay1.UU.NET with SMTP
(5.61/UUNET-shadow-mx) id AA10274; Mon, 1 Apr 91 10:18:57 -0500
Received: by ucsd.edu; id AA04458
sendmail 5.64/UCSD-2.1-sun
Mon, 1 Apr 91 04:30:32 -0800 for brian
Received: by ucsd.edu; id AA04453
sendmail 5.64/UCSD-2.1-sun
Mon, 1 Apr 91 04:30:29 -0800 for /usr/lib/sendmail -oc -odb -oQ/var/spool/lqueue -oi -finfo-hams-relay info-hams-list
Message-Id: <9104011230.AA04453@ucsd.edu>
Date: Mon, 1 Apr 91 04:30:27 PST
From: Info-Hams Mailing List and Newsgroup <info-hams-relay@ucsd.edu>
Reply-To: Info-Hams@ucsd.edu
Subject: Info-Hams Digest V91 #256
To: Info-Hams@ucsd.edu
Info-Hams Digest Mon, 1 Apr 91 Volume 91 : Issue 256
Today's Topics:
ARRL BULLETIN 17 ARLB017
ATV: AM or FM
DX BULLETIN 15 ARLD015
Looking for info on a specific freq. band
N8EMR_BBS_INFO
SPECIAL BULLETIN 6 ARLX006
Send Replies or notes for publication to: <Info-Hams@UCSD.Edu>
Send subscription requests to: <Info-Hams-REQUEST@UCSD.Edu>
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: 1 Apr 91 06:01:23 GMT
From: swrinde!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!tut.cis.ohio-state.edu!n8emr!@ucsd.edu
Subject: ARRL BULLETIN 17 ARLB017
To: info-hams@ucsd.edu
==============================================================
| Automatic relayed from packet radio via |
| N8EMR's Ham BBS, 614-895-2553 1200/2400/9600/V.32/PEP/MNP5 |
==============================================================
ZCZC AG82
QST DE W1AW
ARRL BULLETIN 17 ARLB017
FROM ARRL HEADQUARTERS NEWINGTON CT
MARCH 29, 1991
RELAYED BY KB8NW/OBS & BARF-80 BBS
TO ALL RADIO AMATEURS
Effective April 1, 1991 W1AW voice bulletins will be coming on the
air 15 minutes later. Look for the phone bulletins to start at 45
minutes past the hour rather than on the half hour. This change
allows more time for the transmission of bulletins on digital modes.
------------------------------
Date: 31 Mar 91 17:47:26 GMT
From: usc!rpi!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!emory!wa4mei!ke4zv!gary@ucsd.edu
Subject: ATV: AM or FM
To: info-hams@ucsd.edu
In article <1991Mar29.005013.29370@ux1.cso.uiuc.edu> phil@ux1.cso.uiuc.edu (Phil Howard KA9WGN) writes:
>Some of the ATV equipment on the market for 23cm uses FM instead of AM or
>VSB as its modulation.
>
>I'd like to know what the merits in doing this are. I note that the ARRL
>bandplan for 23cm includes 5 "channels" for ATV that are only 6 MHz wide.
>
>One maker of FM equipment tells me that the picture is a lot less noisy
>and the bandwidth is the same as AM. I don't see how the picture can be
>a lot less noisy. FM gets its advantages when the deviation is high enough
>that noise will not (at a detectable level) modulate the phase of the
>carrier since the amplitude is constant after limiting.
Once the "FM improvement" threshold is passed, FM is the big winner. For
example, on satellite TV, all satellite TV is FM, a C/N ratio of 10 db
yields a 42 db signal to noise ratio in the picture. This is considered
"broadcast quality". Hint: We rebroadcast our network signal from a
satellite distribution system with a C/N of about 10 db on rainy days.
When it's not raining we get a C/N of 40 db, but the signal to noise
ratio of the picture only improves to 50 db. So, once the threshold
is passed there is little improvement in the picture for huge increases
in signal strength. As a point of reference, most broadcast videotape
recorders only achieve a 40 to 50 db signal to noise ratio.
>Broadcast FM uses a deviation (peak) of 75 kHz for a signal bandpass that
>is 15 kHz. I don't know how pre-emphasis actually affects this. The spacing
>between stations in the same area is 800 kHz. I take this latter number to
>mean that at 400 kHz from the carrier center, the sidebands are weak enough,
>but still important enough, that sidebands from an equal level (or maybe
>just a little stronger?) signal 800 kHz away can affect the signal. This
>might be the point where filtering in the IF should cut off?
No. These limits were set by the FCC so that really cheap receivers would
work reliably. By law an FM station cannot radiate any sidebands outside
it's 200 khz channel assignment. In the case of satellite TV, the
normal transponder channel is 30 Mhz wide. Increasingly we are using
"half transponder" modulation of 15 Mhz so that the other half of the
transponder can be used for *another* TV signal. So deviation ratios
of 3 are quite usable with FM TV. If you can tolerate a little degradation
of the picture, a deviation ratio of one should be practical.
>Another aspect of FM that bothers me a lot is the fact that, as the signal
>gets weaker and weaker, the quality of the resultant signal drops even
>faster. The point at which AM and FM equal out will probably be a noisy
>picture, but below that, FM declines very rapidly. Using techniques such
>as frame averaging on the demodulated video won't work, and applying such
>averaging to the IF before demodulation cannot work because the signal is
>not a truly coherent one, and may never be over some paths. With AM, there
>is at least a reasonable hope of using frame averaging if you have enough
>signal to syncronize to, or another means of syncronizing. One of the things
Once you drop below the FM threshold, the signal does degrade very rapidly.
But get just a little above the threshold and the picture gets about as
good as it can get. Also, modern phase locked loop detectors can really
dig down in the noise. Usable broadcast pictures can be had with a C/N of
only 3 db. With a good receiver such as the Harris you'd have a 30 db
picture signal to noise ratio with a 3 db C/N, that's good enough for a
news live shot. I'd like to see usable AM pictures that weak.
By the way, all these TV news remote trucks you see scurrying about use
FM microwave links too. Our trucks use 10 watt transmitters in the 2 Ghz
range and we get routine link range of at least 50 miles. The trucks
use 50 foot pneumatic masts mounting 14 db gain circular polarized antennas.
Note that the 10 watt signal has to travel through about 60 feet of RG9
to reach the antenna. That's about 12 db loss at 2 Ghz.
One final note, I don't know of *any* network affiliate that genlocks
his plant to the network signal these days. In the case of NBC affiliates,
the network downlink unit contains a frame syncronizer that is referenced
to the station's master sync generator. All signals from the plant including
the network signal are referenced to that cheap little crystal oscillator.
With frame syncronizers cheaper than a decent sync generator these days,
most plants have at least a half a dozen syncronizers for retiming incoming
feeds from their network, their remote trucks, their helicopters, and
any satellite feeds they may be using for their newscast. Nobody would
consider genlocking his plant to the unstable signal coming from a
news chopper, yet the news producer wants that chopper picture chroma
keyed in a window with his on set talent. He also wants to lay fancy
news graphic supers over the picture. The frame syncronizer comes
to the rescue. Most frame syncronizers will freeze the last good frame
they receive until another good one comes along.
A recent article about using TV signals to achieve an atomic clock accuracy
reference that appeared in 73 Magazine really made me laugh. I doubt
that there is a broadcaster left in the country that doesn't pass his
network signal through a frame syncronizer when it enters his plant.
Thus your "atomic clock" reference is really a crystal oscillator that
probably isn't even in an oven. Indeed the NBC network routinely does
live satellite switches inside their programming. From one frame to the
next your picture may be coming from the East coast or the West coast.
They count on the frame syncronizer in the local affiliate plants to
keep the picture from rolling on your set at home.
Gary KE4ZV
------------------------------
Date: 1 Apr 91 06:01:47 GMT
From: swrinde!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!tut.cis.ohio-state.edu!n8emr!@ucsd.edu
Subject: DX BULLETIN 15 ARLD015
To: info-hams@ucsd.edu
==============================================================
| Automatic relayed from packet radio via |
| N8EMR's Ham BBS, 614-895-2553 1200/2400/9600/V.32/PEP/MNP5 |
==============================================================
ZCZC AG82
QST DE W1AW
DX BULLETIN 15 ARLD015
FROM ARRL HEADQUARTERS NEWINGTON CT
MARCH 29, 1991
RELAYED BY KB8NW/OBS & BARF-80 BBS
TO ALL RADIO AMATEURS
Thanks to Bob Dow, WB2CJL, with the Western New York DX Association
and Paul, KB1BE, with the Connecticut DX Association for the
following DX information.
FROM THE DXCC DESK. The documentation for the recent ET2A operation
has been received and accepted by DXCC. QSL cards will be accepted
as soon as they are received.
BANGLADESH, S2. Jim Smith, VK9NS, is NOT operating as S21U. The
station found on 21255 KHz at 1730 UTC and working Europe was not
Jim according to Kirsti, VK9NL. Hopefully, Jim will be on
Saturday or Monday if he receives his official license, according
to the latest FAX from Kirsti.
KAMPUCHEA, XU. Boo and Phet, XU1DK, are now active on RTTY. Look
for them on 21088 KHz around 1300 to 1400 UTC. They have no
commercial power at their site and have been using power from an old
generator that is working at night local XU time. Their typing maybe
slow, but they will QSO with USA stations when conditions permit.
There is no postal system in XU land so log info must be passed by
hand to get to Japan. QSL cards will be slow, so please be patient.
QSL to PO Box 80, KOUJIMACHI, Tokyo, Japan. Do not send cards to
TORU, JG1RVN.
MARIANA ISLANDS (SAIPAN), KH0. Look for JA1PGY. During his
vacation, he will be operating from Saipan as KH0/JA1PGY. He will
be QRV around April 26 to 28. He will have RTTY capability and will
be operating with a Zepp halfwave antenna. WARC band operations
will be attemped.
BAHRAIN, A9. Rich, KI3V, keeps the DX crowd busy with his operation
on CW and SSB on all bands. He will be there for two more weeks.
QSL via his home call.
ST. PAUL ISLAND, CY9. QSL cards for the CY9CF operation are still
in the hands of the printers. They will be shipped to FP5DX, around
the first week in April.
BHUTAN, A51. Jim, VK9NS, and Kirsti, VK9NL are still planning to
go to Bhutan in early May for two weeks. Equipment will be
shipped earlier as they will bring a beam plus a linear amplifier.
NEPAL, 9N1. 9N1MM has been heard and worked in Western New York on
20 meter cw.
YEMEN, 7O1. Gabi, DL2BCH, now has the computer disks containing the
logs for the 7O1AA operation. It will take a few days to change the
computer format and then the cards will be answered.
NOTE 1. WB2WOW, QSL manager for ET2A and ST0DX became a silent key
on Saturday, March 23. QSL to the same address as cards will be
handled by Howard, WA2NHA.
Good Luck on DX de KB8NW/OBS
------------------------------
Date: 1 Apr 91 08:30:24 GMT
From: sdd.hp.com!usc!neuro.usc.edu!demikhov@ucsd.edu
Subject: Looking for info on a specific freq. band
To: info-hams@ucsd.edu
In article <2412@stsci.EDU> tullos@stsci.EDU (Calvin Tullos) writes:
>I'm looking for information on who might be broadcasting
>between 174 MHZ and 199 MHZ..... vs. wireless microphone.
174-216 MHz Television Channels 7-13 (6 Mhz of spectrum for each channel)
------------------------------
Date: 1 Apr 91 06:00:47 GMT
From: swrinde!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!tut.cis.ohio-state.edu!n8emr!root@ucsd.edu
Subject: N8EMR_BBS_INFO
To: info-hams@ucsd.edu
The N8EMR Ham bbs is online to serve the needs of the
amateur radio operators..
1/26/91 The BBS is now running on the 386 machine.
12/5/90 Columbus and HBBS are now available via PC pursuit dialout.
7/15/90: This BBS is now part of the AMSAT BBS network..
HOW TO ACCESS THE N8EMR HAM RADIO TELEPHONE BBS !!!
System Name: N8EMR
Phone: 614-895-2553
Login: hbbs
Data Settings: 8 Bits, NO Parity, 1 Stop Bit
Times: 24hrs
IP Address: 44.70.0.1
Amateur radio annonymous ftp access is available via the ohio
netrom/ip network. CMHIP is the Netrom node Id and is known
by most of the nodes in ohio. (its slow but it works)
This is only via the ohio packet network. This sytem
is not available via the "INTERNET".
To access the system via the dialup, at the login prompt type hbbs
(lower case only), you will then enter the BBS program. Follow the
directions from the bbs prompts.
I attempt to keep the latest and greatest HAM software on-line, and encourage
all to upload Here is some of software that is available for downloading.
KA9Q TCP/IP Software for various computers, PC,atari-st,Mac, amgia, unix
MORSE CODE Tutors
Modifications for HAM Rigs and Scanners
DX and contesting programs
Various amateur Newsletters
Packet Terminal programs
AMSAT news and satellite keplerian elements
Files and messages areas for AMSAT, GENERAL topics, PACKET,
KA9Q, MODS to various rigs, TVRO,SCANNER and SWL.
Many mb of of file of interest to the radio operator.
Question or comments to
Gary W. Sanders (gws@n8emr or ...!osu-cis!n8emr!gws), 72277,1325
N8EMR @ W8CQK (ip addr) 44.70.0.1 [Ohio AMPR address coordinator]
HAM BBS (1200/2400/9600/V.32/PEP/MNP=L5) 614-895-2553
Voice: 614-895-2552 (eves/weekends)
------------------------------
Date: 1 Apr 91 06:01:26 GMT
From: swrinde!zaphod.mps.ohio-state.edu!tut.cis.ohio-state.edu!n8emr!@ucsd.edu
Subject: SPECIAL BULLETIN 6 ARLX006
To: info-hams@ucsd.edu
==============================================================
| Automatic relayed from packet radio via |
| N8EMR's Ham BBS, 614-895-2553 1200/2400/9600/V.32/PEP/MNP5 |
==============================================================
ZCZC AX28
QST DE W1AW
SPECIAL BULLETIN 6 ARLX006
FROM ARRL HEADQUARTERS NEWINGTON CT
MARCH 28, 1991
RELAYED BY KB8NW/OBS & BARF-80 BBS
TO ALL RADIO AMATEURS
NASA has announced that the all ham crew of STS-37 will fly aboard
Atlantis on April 5 at 1418 UTC. The packet callsign to be used is
KB5AWP, transmitting on 145.51 MHz. Ground stations transmit on
144.91. Transmit only when the shuttle is in your range. Listen
for bulletins concerning random voice and SSTV times from the
Goddard ARC, WA3NAN, on 3860, 7185, 14295 and 21395 KHz.
------------------------------
Date: 1 Apr 91 05:52:04 GMT
From: suns.UMD.EDU!jph@umd5.umd.edu
To: info-hams@ucsd.edu
References <9103192122.AA01566@ucsd.edu>, <andreap.669677698@s.ms.uky.edu>, <1991Mar31.223819.22840@usenet.ins.cwru.edu>
Reply-To : jph@suns.UMD.EDU
Subject : Re: First No-code Tech?
In article <1991Mar31.223819.22840@usenet.ins.cwru.edu> rab@hal.CWRU.Edu (Roger Bielefeld) writes:
>K1MAN just broadcast a report that the first no-code tech license
>was issued to Robert Williams of Annapolis, Maryland. He was issued
>the call N3IFY.
>
>Roger N8NNK/AE
>--
>Roger Bielefeld Case Western Reserve University
>rab@hal.cwru.edu Cleveland, Ohio USA
Well, I got mine in the mail over a week ago. It is
dated 19 March '91. The FCC was faster than I expected.
(I took the test 16 Feb 91.) We're already out there.
Pat Harrington N3IZV
------------------------------
End of Info-Hams Digest
******************************