QRZ! Ham Radio 4/QRZ Ham Radio Callsign Database - Volume 4.iso/digests/infoham/940925.txt

Internet Message Format | 1994-11-13 | 10KB

Date: Wed, 17 Aug 94 04:30:09 PDT
From: Info-Hams Mailing List and Newsgroup <[e-mail]>
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Subject: Info-Hams Digest V94 #925
To: Info-Hams


Info-Hams Digest            Wed, 17 Aug 94       Volume 94 : Issue  925

Today's Topics:
                  Cable TV equivalent of  427.25 Mhz
                       cell RF characteristics
                    Code Quick for Learning Morse
                    hamfest Aug. 20th, Oakland, NJ
                            Regency HR-2A
                      Repeater Directory On-Line
                       RFI to a smoke detector

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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: Tue, 16 Aug 1994 13:56:05 GMT
From: dog.ee.lbl.gov!agate!howland.reston.ans.net!europa.eng.gtefsd.com!uhog.mit.edu!news.mtholyoke.edu!news.umass.edu!news2.near.net!usenet.elf.com!rpi!psinntp!arrl.org!@@ihnp4.ucsd.edu
Subject: Cable TV equivalent of  427.25 Mhz
To: [e-mail]

David Adams ([e-mail]) wrote:

: Can anyone tell me the cable channel equivalent of 427.25 Mhz?  I had
: a whole list of all the channel/freqs before I left indiana (the
: local atv community did NOT believe in downconverters), but I lost
: it.

It is cable channel 58. A list of TV channels is available from the ARRL
Automated Electronic Mail Server, [e-mail]. Send the following as the
text of a message to [e-mail]   :

help
index
send catvfrq.txt
quit

73 from ARRL HQ, Ed
--
Ed Hare, KA1CV, ARRL Laboratory, 225 Main, Newington, CT 06111
203-666-1541 [e-mail]

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Date: 16 Aug 1994 17:00:35 GMT
From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!cat.cis.Brown.EDU!adis-204.adis.brown.edu![e-mail]
Subject: cell RF characteristics
To: [e-mail]

In article <[e-mail]>, kevin jessup
<[e-mail]> wrote:

> Given all of the above, does transmitter finger printing really work?
> Has it ever stood a test in a court of law?

Good question. I've never heard of a fingerprint being used as evidence in
court proceedings but I'm sure if you push the FCC hard enough they would.

--
== Tony Pelliccio, KD1NR                          Tel: [phone]
== Box 1908, Providence, RI 02912       Fax: [phone]
== Opinions herein are mine and not those of my employer. Nyah nyah nyah.

------------------------------

Date: Wed, 17 Aug 1994 00:56:37 GMT
From: gsm001![e-mail]
Subject: Code Quick for Learning Morse
To: [e-mail]

Robert J. Kinder ([e-mail]) wrote:
: Has any used the "Code Quick" product by Wheeler Applied Research Lab to
: learn Morse code? Does it work? How well? Any comments?

I have. I had been trying since 1965 to learn the code. I tried all sorts
of things and had no luck. With code quick I passed the 5 wpm test
(100%, >2 min perfect copy) in about 2.5 months.


My son (aged 12) went from 0 wpm to 4 wpm in a month.


To me it's the best radio related thing you can buy. IMHO it's a bargain
at $39.95.

73

Geoff.

--
"I am number six. Others come and others go, but I am always number six."
(From the movie "Eminent Domain".)

Geoffrey S. Mendelson N3OWJ    [phone]  [e-mail]

------------------------------

Date: Tue, 16 Aug 94 20:55:04 -0500
From: news.delphi.com![e-mail]
Subject: hamfest Aug. 20th, Oakland, NJ
To: [e-mail]

There is a hamfest this coming Saturday, August 20th in Oakland, NJ.
I am trying to get directions to this hamfest from the Garden State Parkway
and Route 80.  Can anyone supply the directions and also (starting time0 if
pssible?  Thanks.
Joe Keenan

------------------------------

Date: 16 Aug 1994 17:28:49 GMT
From: news.cerf.net!gopher.sdsc.edu!news.tc.cornell.edu!travelers.mail.cornell.edu!news.kei.com!eff!news.umbc.edu!europa.eng.gtefsd.com!howland.reston.ans.net!swrinde!gatech!@@ihnp4.ucsd.edu
Subject: Regency HR-2A
To: [e-mail]

Mark Symms ([e-mail]) wrote:
: Hi all,
:     I tried to post this earlier but I don't think it made it.  I was
: curious if the Regency HR-2A ( 2 meter mobile crystal controlled ) would be
: a good radio to use for a packet xceiver?  Do I need CTCSS tones to access
: the node?  And are crystals still available?
: Mark

This is a real old rig, and may have been designed to handle wide
band (+-15khz) FM.  If so, you will be hearing signals on adjacent
channels.  I ran into this problem with an old Icom IC20.  Had to
swap out the IF filter.
If you have the manual for it, check the rx selectivity specs.  You
could also use sig-gen to test it.

  - Dave  WA3U

------------------------------

Date: 17 Aug 94 08:21:05 GMT
From: [e-mail]
Subject: Repeater Directory On-Line
To: [e-mail]

You say that there is a copy on line someplace on the INTERNET?
Where is it located.  I've looked and I am unable to find it.
I'm sure I am not the only Ham looking......

73

Tim Wright  KD4OVM
[e-mail]

------------------------------

Date: Tue, 16 Aug 1994 13:52:10 GMT
From: dog.ee.lbl.gov!agate!howland.reston.ans.net!europa.eng.gtefsd.com!uhog.mit.edu!news.mtholyoke.edu!news.umass.edu!news2.near.net!usenet.elf.com!rpi!psinntp!arrl.org!@@ihnp4.ucsd.edu
Subject: RFI to a smoke detector
To: [e-mail]

Gary Coffman ([e-mail]) wrote:

: In article <[e-mail]> [e-mail]
: (Gilbert Baron) writes:
: >I have a big problem with the smoke detectors in my home. They squeal when I
: >transmit on 40 meters. They are the type that are permanently wired to the
: >ac line. Has anyone had this problem and knows what to do about it. I can
: >try bypasses or chokes or some such thing on the line I guess? I may have to
: >go to a battery operated detector perhaps? Any thoughts on this from anyone?
: >Respond here and if you have really important information please email me
: >too at [e-mail]. Thanks in advance.

: The standard treatment would be a couple of 2.5mH chokes in series
: with the leads, and a .001 disc ceramic capacitor across the line.
: However, if these are the type that talk to each other via carrier
: current on the AC line so that all of them sound when one detects
: smoke, you can't do this. You may be hosed. Your other alternative
: is to try to get the 40 meter energy away from your wiring. Locate
: your antenna higher and/or further away from the house.

Gary is right; the chokes might interfere with the communication between the
smoke detectors. In any event, it is not a good idea to put capacitors
across an AC line unless the capacitors are *AC* rated.

The house wiring or interconnect wiring is probably resonant on 40 M.
In most cases, RF pickup on the AC lines is going to be common-mode, with
all three wires acting as if they were one wire. Get some FT-240-43 ferrite
cores (Ocean State Electronics has them in stock, credit card okay,
reasonable minimum order tel [phone]). You may have to extend the
length of the wiring, but if you wrap 5-10 turns of the AC and/or
interconnect wiring (all the wires wrapped together) onto the ferrite core,
it will usually choke off any common-mode signal without affecting the
desired signal that connects all the detectors together.

I would first simplify the system a bit, perhaps with two units wired
together, just to find out which wiring or units are suspectible. Add the
other units back one at a time, debugging RFI as you go along.

If you happen to have some ferrite material laying about, go ahead and try
it. But if it doesn't work, don't assume that using the correct #43 material
won't work. I am always hearing tales of folks who buy "generic" toroids, or
use a single split bead, or one of the RS snap-together chokes, or the old
yoke from a TV set, only to find that they don't always work as well as one
might expect. The general rule is that if it fixes the problem, it is okay
to use, but if it doesn't, try the correct material before you give up and
go onto something else.

73 from ARRL HQ, Ed
--
Ed Hare, KA1CV, ARRL Laboratory, 225 Main, Newington, CT 06111
203-666-1541 [e-mail]

------------------------------

Date: Tue, 16 Aug 1994 17:04:04 GMT
From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!cs.utexas.edu!convex!seas.smu.edu!vivaldi!rsd0!rsd.dl.nec.com![e-mail]
To: [e-mail]

References <32lqsf$[e-mail]>, <[e-mail]>, <32o4c5$[e-mail]>aldi
Subject : Re: Repeater Directory?

In article <32o4c5$[e-mail]>, [e-mail] (richard nimtz) writes:

[snip...]

|> The phone company used to put dummy entries, names and numbers that didn't
|> exist in real life, in the telephone directory. That way they could look
|> at a competitors directory and easily see of they copied the data. Is the
|> ARRL doing the same thing with the latest repeater directory? There are

They must be because they list 146.88 here in Dallas and thats a dummy
repeater if I ever heard one :-)


========================================================================
Dave Rogers                                 Internet:   [e-mail]
M & R Software, Inc.                          CIS:   76672,2455

In the absence of leadership, we have decided to follow ourselves.

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End of Info-Hams Digest V94 #925
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