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INFO-HAMS Digest Wed, 20 Dec 89 Volume 89 : Issue 1048
Today's Topics:
alternative to FM tranceivers?
Callbook privacy?
Getting serious about building.
Morse code, obscenity, and packet retransmission.
Re: ARRL and tx/rx mods
rec.radio.shortwave "invite"
The un-net on 10meters on Saturday (1600-1800Z)
University Clubs notice
W1AW: Computer-generated QRM ?
----------------------------------------------------------------------
Date: 20 Dec 89 20:31:19 GMT
From: oli-stl!asylum!langz@decwrl.dec.com (Lang Zerner)
Subject: alternative to FM tranceivers?
Message-ID: <9170@asylum.SF.CA.US>
First off, I am a radio novice with a good technical background in
non-electronic areas. I understand logic and the basic principles of
electronics, but I couldn't build something from a schematic. I do have
friends who are electronics hackers and can read schematics, but none know
radio. I have a radio problem which could be solved by hacking existing
equipment or locating suitable alternates. Now...
I produce live roleplaying "living fiction" weekends at a wilderness site in
northern California. At the moment we are using FM headset tranceivers for
communication between staff. This workks for the most part, since staff aren't
usually too far apart, the grounds are fairly flat, and the structures are
mostly wooden without thick walls or wiring. Unfortunately, there is one part
of the site (the "Indian Bowl") which is up a wooded hill. The tranceivers
communicate (with difficulty) almost the complete distance between the Indian
Bowl and the production control center, but not quite.
The tranceivers are small boxes which attach to staffers' belts, with attached
headsets with boom mikes. Can anyone suggest an alternative with a better
range. The system must be lightweight and portable, and an earphone for
private listening is essential. We would like to keep costs down and avoid red
tape, so equipment which requires courses and license exams is not exactly
prefereable.
Alternately, I'd be interested in learning about any way to extend the range of
our current equipment. The systems span a fairly wide frequency range, so
increasing the FM deviation wouldn't necessarily cause a problem (we could just
use the middle of the five frequencies), if that could help. If any such
modifications would be in violation of FCC regulations, please let me know.
Naturally, I am interested in learning about such modifications for educational
purposes only.
In case they are helpful, I've attached the transceiver specs below. Thanks!
Maxon Model 49-H5 FM Tranceiver
Specifications
General:
Power source 4 x 6VDC "AA" size batteries
Frequency range A -- 49.830 B -- 49.845 C -- 49.860
(5 channels) D -- 49.875 E -- 49.890
Current Drain Stand-by: 20 mA
Receive: 60 mA
Transmit: 50 mA
Service range Avg.: 400 meters
Max.: 800 meters
Dimensions 160mm x 72mm x 24 mm
Receiver:
Receiving system FM dual conversion superheterodyne
Intermediate frequency First: 10.7 MHz
Second: 455 KHz
Sensitivity 1 uV (20dB quieting)
1 uV (squelch open)
Spurious/image reject 20 dB min.
Frequency stability +/- 2 KHz (0-40deg C)
Speaker impedance 32 ohm
Transmitter:
Transmitting system Voice-activated or manual switch to begin transmit
Power 10,000uV meter @ 3 meters (FCC Maximum)
Antenna 50 ohm flexible whip
Modulation FM
Max frequency deviation 4.5 KHz
Audio distortion 10% maximum
Frequency stability +/- 2 KHz (0-40deg C)
Microphone electret condenser
--
Be seeing you...
--Lang Zerner
langz@asylum.sf.ca.us UUCP:bionet!asylum!langz ARPA:langz@athena.mit.edu
"...and every morning we had to go and LICK the road clean with our TONGUES!"
------------------------------
Date: 20 Dec 89 08:02:35 GMT
From: wa3wbu!ka3adu!dave@uunet.uu.net (dave hultberg)
Subject: Callbook privacy?
Message-ID: <580@ka3adu.UUCP>
In article <322@ssc.UUCP>, tad@ssc.UUCP (Tad Cook) writes:
>
>
> Regarding G6WBG's query, the FCC files that are used for publising
> the callbook are a matter of public record. I have known hams who
> wanted a bit more privacy, so they filed a form 610 to show their
> mailing address as a P.O. Box.
>
Using a P.O. Box is good enough to conceal your address in the Callbook, but
not in the publicly available data bases. I have a copy of the US Amateur
file that Rusty Carruth got from the FCC. In addition to the mailing address,
it contains your station address. Station addresses must be actual physical
location, not P.O. Box or rural route box number, etc. In this age of
computers, true privacy is pretty rare.
--
===============================================================================
Dave Hultberg KA3UZR UUCP: uunet!wa3wbu!ka3adu!compnect!daveh
US Snail: 1407 Concord Road, Mechanicsburg, PA 17055-1955 CIS: 72437,3215
------------------------------
Date: 20 Dec 89 15:39:42 GMT
From: rochester!rit!cci632!dvh@rutgers.edu (David Hallidy)
Subject: Getting serious about building.
Message-ID: <32734@cci632.UUCP>
In article <2844@dogie.macc.wisc.edu>, kleemann@vms.macc.wisc.edu (Brad Kleemann) writes:
> In article <7026@unix.SRI.COM>, henry@ginger.sri.com (Henry Pasternack) writes...
>
(good background stuff deleted- read the original)
> >
> > 1) A synthesized 2 meter FM transceiver.
> > 2) A low-band HF receiver / transmitter pair.
> >
> > Either project would do. If it's the 2 meter rig, I want a compact
> >base rig with ten watts. If it's the low-band radio, I want to start
> >with a basic double conversion receiver design in modular format so
> >that I can later build it into a full-blown multi-band radio. CW only
> >on transmit is fine for now, with a hundred watts or so of input power.
> >Quality is the key, and money may not be an object.
> >
(more stuff deleted)
> for the Radio Amateur_ by the ARRL, and possibly their book on
^^^^^^^^^^^^^^^^^^^^^^^^^^
> VHF/UHF construction techniques. I got mine from Amateur Electronic
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> supply in Milwaukee, they have several locations as well as mail-
> order service. Second, make friends with someone who owns a
> spectrum analyzer and possibly a sweep system. Ours is real
> handy for that after-hours government work. Third, be prepared
> to spend a LOT of time. I've played with cohn-type ssb crystal
(lots of good info deleted)
> |Brad Kleemann (kleemann@macc.wisc.edu) | WB9WHI |
> |Madison Academic Computing Center | Badger Amateur Radio Society (W9YT) |
> +-----------------------------------------------------------------------------+
What ARRL VHF/UHF construction techniques book? If you're refering
to the RSGB VHF/UHF Manual, yes, it's pretty good, tho' somewhat
antiquated now. I'm told a new one is on the way. ARRL hasn't
published a VHF/UHF manual since the late '60s or very early '70s
to my knowledge. Otherwise, I agree with everything you said in your
response. I also will take the step of offering my help to Henry,
if he wants it, though it's probably not the most convenient thing
for either of us. However, if you need some ideas, there are lots
of us around. Also, the ARRL Handbook (see, I do support them when
they deserve it) has a lot of good basic ideas you can adapt to your
own application, if you don't want to copy their construction
articles.
Anyway, if you want to Henry, give me a call or email me and we
can discuss some RF design ideas. My daytime Phone # is (716)
482-5000 ext.2345. If not convenient, email me and we'll go from there.
Hope this is some help.
73 Dave KD5RO
------------------------------
Date: 20 Dec 89 23:34:10 GMT
From: zaphod.mps.ohio-state.edu!mips!excelan!unix!ginger.sri.com!henry@tut.cis.ohio-state.edu (Henry Pasternack)
Subject: Morse code, obscenity, and packet retransmission.
Message-ID: <7114@unix.SRI.COM>
My apologies to those who might have been offended by some strong
language I used at the end of a recent posting. I would like to point
out that I was replying to the signature offered by Michael Batchelor
in which he made an off-color comment about code, encrypted in dots
and dashes. The final line to my posting quoted Mr. Batchelor, and so
the comment was not entirely out of the blue.
A New Jersey ham politely but firmly asked me to watch my language
because a group he is associated with retransmits this bulletin board
via packet radio. In my reply to him, I expressed surprise that
retransmissions occur automatically without the immediate supervision
of a control operator. This strikes me as somewhat illegal, since there
is no means of controlling the transmission content.
Comments?
In any event, I admit it is in bad taste to publically propagate
obscenity. But the computer net is not amateur radio. I wonder if
some people forget that fact when they feed USENET directly into their
packet systems.
-Henry
------------------------------
Date: 19 Dec 89 23:44:50 GMT
From: hpfcso!hpfcdc!perry@hplabs.hp.com (Perry Scott)
Subject: Re: ARRL and tx/rx mods
Message-ID: <7880101@hpfcdc.HP.COM>
I recant. I said Marine VHF, and what you say is true. That band requires
type acceptance.
However, CAP other para-military frequencies are well within the
capabilities of most 2-meter rigs. I've been told that most military
bands do not need the type acceptance.
Funny how the government treats itself and commercial interests differently.
Perry Scott
KF0CA
------------------------------
Date: 20 Dec 89 13:36:26 GMT
From: shlump.nac.dec.com!ryn.esg.dec.com!pstjtt.enet.dec.com!taber@decwrl.dec.com
Subject: rec.radio.shortwave "invite"
Message-ID: <629@ryn.esg.dec.com>
In article <270@ccop1.ocpt.ccur.com>, wilson@ccop1.ocpt.ccur.com (<wilson>) writes...
>
>
>Can anybody explain what a "dweeb" is? It's not listed in my
>American Heritage Dictionary of the English Language.
>Although I can infer a definition from the context in
>which it's used, I prefer to have a precise definition.
>
DWEEB -- Noun, but not a person or place, if you get my drift.
An entity which has a compulsive need for precise,
authorized definitions. Someone who needs the
joke explained. Several times. The person in the
audience who shouts "That slide is upside down!"
as if they were the only who could see it. Armchair
lawyers who argue that transmitting a fax of sheet
music is transmitting music. The person who required
that auto mirrors have the words "Objects are closer
than they appear" written on them. People who object
to Bugs Bunny cartoons because they promote violence.
People unable to think for themselves and unwilling to
let others think either. A generic class of individuals
who don't have a clue that they don't have a clue.
Useage is generally considered somewhat pejorative.
>>>==>PStJTT
Patrick St. Joseph Teahan Taber
Mail address: Nahhhhh, you don't want to send me mail....
------------------------------
Date: 19 Dec 89 23:22:27 GMT
From: hpfcso!hpfcdc!perry@hplabs.hp.com (Perry Scott)
Subject: The un-net on 10meters on Saturday (1600-1800Z)
Message-ID: <7880100@hpfcdc.HP.COM>
>>I do wish that contest organizers would set up band restrictions. 29.300
>>through 29.600 was completely full. I had to go all the way up to 29.650
>>to find an un-contested frequency.
>
>I hope you mean 28.300 - 28.600.
Yup. Got lost. Thought CB was 28 MHz.
I think it would be sufficient for contest organizers to reserve the
lower 25 KHz of the Novice 10m band for the rest of us. Same for the
lower part of the General 15 and 20 bands.
I still stand by my statement that contests are insta-QRM generators.
The real problem is that all nets get displaced by contesters, while the
reverse is not true. I think the band is big enough for all uses -
contests, nets, and ragchewers. Do we need to talk to CQ, QST, et.al. ?
Perry
------------------------------
Date: 20 Dec 89 21:20:16 GMT
From: rochester!rit!ultb!cep4478@rutgers.edu (C.E. Piggott)
Subject: University Clubs notice
Message-ID: <1809@ultb.isc.rit.edu>
I have the following people on my list ... I don't think that I
really lost anybody - if you're missing, we'll fix it ASAP.
If you missed what's going on here, I'm compiling a list of
people involved with university amateur radio clubs, to exchange
ideas etc. with each other.
I'll ask Phil to post something to here about how to add yourself to
the list...I know how to do it from bitnet, but not from internet.
Write me email to cep4478@ultb.isc.rit.edu if you wrote me and I missed
you - I'll be writing personally to everyone probably right after the
new yar.
--
worall@freezer.it.udel.edu R.Todd Worall KB2GGS U. of Deleware ARC
kawai@csli.stanford.edu Goh Kawai N6UOK - Stanford ARC
paulf@shasta.stanford.edu Paul Flaherty, N9FZX - Stanford ARC
huopio@kannel.lut.fi Kauto Huopio, Lappeenrante U. of Technology
snowdog@athena.mit.edu Rich Brezina, N1FMM - M.I.T. ARC
bjb@hubcap.clemson.edu BJ Backitis KM4RB - Clemson U. ARC
luigi@mts.rpi.edu Luigi Giasi, R.P.I. ARC (W2SZ)
msmith@topaz.rutgers.edu Mark Smith, Rutgers ARC
mcdonald@topaz.rutgers.edu Dan McDonald, KB2EEP - Rutgers ARC
cousens@hardees.rutgers.edu Scott Cousens N3FXP - Rutgers ARC
rsanders@sunee.UWaterloo.edu Roger Sanderson VE3RKS - U. of Waterloo
levine@clutx.clarkson.edu Steve Levine NK1W - Clarkson U. ARC
cromwell@ef.ecn.purdue.edu Bob Cromwell W9YB - Purdue ARC
deplo@eniac.seas.upenn.edu Jeff Deplo N3HZB - U of Pennsylvania ARC
dunc@godzilla.eecg.toronto.edu Duncan VE3PKD, U of Toronto
mark@ab1x.enet.dec.com Mark Hald, N1EEM - Northeastern U. ARC
------------------------------
Date: 20 Dec 89 00:07:07 GMT
From: hpfcso!hpfcdc!perry@hplabs.hp.com (Perry Scott)
Subject: W1AW: Computer-generated QRM ?
Message-ID: <7880102@hpfcdc.HP.COM>
This is probably a re-hashed question that comes up every two years -
I thought W1AW was just like the rest of us, and aren't allowed to
QRM a frequency. If the transmitter is computer controlled, isn't
this slightly un-nice to anyone they happen to land on ?
A few nights ago, four hams on 7.290 were ragchewing late into the night.
It was particularly interesting because one was in Buffalo, NY, and another
was in Honolulu. The copy wasn't particularly good; the band QSB was
pretty bad. However, it was fun to see if Buffalo could make it to KH6.
Lo and behold, W1AW comes on with it's bulletin/broadcast. The weird
part was that nobody really heard W1AW, except the guy in Buffalo. I
was really surprised to hear him say that my speech processor and lowly
300 watts PEP could go up against W1AW anytime. I listened for a moment
before replying, and sonofagun, there it was !
I want to share the band with everyone, but it appears some stations are
more equal than others. Had a real operator at W1AW come on and asked
for the frequency, citing schedules, tradition, whatever, I'm sure
we could have moved. It's just that 7.290 is a nice frequency - no
foreign broadcast station.
I think the W1AW operating policy is rude at the least. While nets
have their place, we all operate according to Gentlemen's Agreement.
Computer-controlled QRM is about as bad as Computer-controlled telephone
solicitors.
Perry Scott
KF0CA
------------------------------
End of INFO-HAMS Digest V89 Issue #1048
***************************************