[MRCA] MRCA Digest, Vol 100, Issue 20
Lou Ribble
n3od at frontiernet.net
Mon Aug 27 19:29:42 EDT 2012
Al & Group,
I am bringing my PRC-25. If you need it, it will be available.
Lou-n3od
-----Original Message-----
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Behalf Of mrca-request at mailman.qth.net
Sent: Monday, August 27, 2012 12:03 PM
To: mrca at mailman.qth.net
Subject: MRCA Digest, Vol 100, Issue 20
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Today's Topics:
1. Re: Retransmit: was MRCA Meet Recon Patrol Operations
(WA5CAB at cs.com)
2. Re: Retransmit: was MRCA Meet Recon Patrol Operations (Al Klase)
3. Fiendish plan #2 (Al Klase)
4. Re: Fiendish plan #2 (W2HX)
5. Mil. Power Supply for sale at Gilbert (Rob Flory)
6. Re: Retransmit (Ray Fantini)
7. Re: Retransmit (Ken Downs)
----------------------------------------------------------------------
Message: 1
Date: Sun, 26 Aug 2012 14:19:08 -0400 (EDT)
From: WA5CAB at cs.com
Subject: Re: [MRCA] Retransmit: was MRCA Meet Recon Patrol Operations
To: mrca at mailman.qth.net
Message-ID: <16c46.c37fcec.3d6bc29b at cs.com>
Content-Type: text/plain; charset="US-ASCII"
I've not paid any attention to newer sets but AN/MRC-20 and AN/MRC-35 were
Jeep or 3/4 Ton mounted HF/VHF/UHF (all AM) sets with simplex retransmit
capabilities between any pair. Radios were AN/ARC-3,8,27 but there was
probably one using the equipment generation the thread has been mentioning.
In a message dated 08/26/2012 12:18:37 PM Central Daylight Time,
w2hx at w2hx.com writes:
> Al, here is a very interesting interconnection diagram on the back of
> your C-7673/pcc-1
> http://www.geocities.co.jp/Technopolis-Mars/9972/html/pcc1_2.html
>
>
> -----Original Message-----
> From: mrca-bounces at mailman.qth.net [mailto:mrca-bounces at mailman.qth.net]
> On Behalf Of Al Klase
> Sent: Sunday, August 26, 2012 1:09 PM
> To: Gene Smar
> Cc: mrca at mailman.qth.net
> Subject: Re: [MRCA] Retransmit: was MRCA Meet Recon Patrol Operations
>
> Gene and the Group,
>
> I have one of these as well, came along with the duplexer.:
>
http://www.murphyjunk.bizland.com/imagelib/sitebuilder/misc/show_image.html
> ?linkedwidth=actual&
>
linkpath=http://murphyjunk.bizland.com/sitebuildercontent/sitebuilderpicture
s/PCC1UCD.jpg
> <
>
http://www.murphyjunk.bizland.com/imagelib/sitebuilder/misc/show_image.html?
linkedwidth=actual&
>
linkpath=http://murphyjunk.bizland.com/sitebuildercontent/sitebuilderpicture
s/PCC1UCD.jpg>
>
> Thanks for the nomenclature, Dennis. This should eliminate the CX-4656,
> and power two PRC-77's from a single source, including 117 VAC. I'll
> retrieve this stuff from storage. I should have at least on extra
> PRC-77 or equivalent, like a 628K1.
>
> If you really want to play with field phones, I have a small collection,
> including an SB-22. I never thought anyone cared. :-(
>
> Al
>
> On 8/26/2012 12:46 PM, Gene Smar wrote:
> >Al et al:
> >
> > Here's a link, I think, to the duplexer you describe:
> >http://www.prc68.com/I/CU2194.html . It's just an antenna duplexer
> >that permits one antenna to be used simultaneously with two PRC-77's.
> >The freq sep required is 3 MHz. It does not, however, provide the
> >connections that permit one -77 to retransmit the audio of the second
> >and VV. For that you would need the CX-4656/GRC cable harness, below.
> >
> > Also, if we did set up the two 6M freqs and retransmit each to the
> >other, we'd have to make sure that the two groups of stations, one on
> >each freq, could hear each other. Otherwise, there may be some
> >stations that could be heard (and retransmitted) by the repeater, but,
> >because of their low-lying location, might not be heard by other
> >co-channel (e.g., 50.4 MHz) stations nearby.
> >
> > To try this mode at GIlbert we'd need a couple of good -25/-77s
> >plus bunches of other frequency-agile radios that can move to channels
> >other than 51.0. I have one -25 that I usually bring. ANyone else?
> >
> >
>
> --
> Al Klase - N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
>
Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480
------------------------------
Message: 2
Date: Sun, 26 Aug 2012 15:10:51 -0400
From: Al Klase <ark at ar88.net>
Subject: Re: [MRCA] Retransmit: was MRCA Meet Recon Patrol Operations
To: W2HX <w2hx at w2hx.com>
Cc: "mrca at mailman.qth.net" <mrca at mailman.qth.net>
Message-ID: <503A74BB.4080900 at ar88.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Do you have a GRA-39 pair? - Al
On 8/26/2012 1:12 PM, W2HX wrote:
> Taking your idea further, what about connecting an EE-8 through a GRA-39
to the radios? Just more fun!
>
--
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/
------------------------------
Message: 3
Date: Sun, 26 Aug 2012 16:16:40 -0400
From: Al Klase <ark at ar88.net>
Subject: [MRCA] Fiendish plan #2
To: Military Radio Collectors Association <mrca at mailman.qth.net>
Message-ID: <503A8428.3030309 at ar88.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Gang,
If we can get HF-VHF retransmit running at Gilbert, we can run
Saturday's Moose & Squirrel net locally on 51.0, and take checkins from
off-site stations.
I have a GRC-213 (PRC-104) that might support this if I can figure out
the J-102 connector, and get something that plugs into it. However, if
someone has an easy way, speak up.
Al
--
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/
------------------------------
Message: 4
Date: Sun, 26 Aug 2012 15:49:24 -0700
From: "W2HX" <w2hx at w2hx.com>
Subject: Re: [MRCA] Fiendish plan #2
To: "Al Klase" <ark at ar88.net>, "Military Radio Collectors Association"
<mrca at mailman.qth.net>
Message-ID:
<A84117545CAA524BA8C609247D3650571DAC27BD86 at EX-BE-012-SV1.shared.themessagec
enter.com>
Content-Type: text/plain; charset=us-ascii
My RF-5020 will support it, but I have to figure out how to use it. There is
a "Retransmission Key Line Output" in the auxiliary connector port, but
there isn't any explanation on it other than it is "ground closure" which
sounds compatible with what has been explained for the VRC stuff. There is
also an audio keyline input (ground closure) which sounds right also.
I will look into my PRC-138 documentation to see whats what.
-----Original Message-----
From: mrca-bounces at mailman.qth.net [mailto:mrca-bounces at mailman.qth.net] On
Behalf Of Al Klase
Sent: Sunday, August 26, 2012 4:17 PM
To: Military Radio Collectors Association
Subject: [MRCA] Fiendish plan #2
Gang,
If we can get HF-VHF retransmit running at Gilbert, we can run Saturday's
Moose & Squirrel net locally on 51.0, and take checkins from off-site
stations.
I have a GRC-213 (PRC-104) that might support this if I can figure out the
J-102 connector, and get something that plugs into it. However, if someone
has an easy way, speak up.
Al
--
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/
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Message: 5
Date: Mon, 27 Aug 2012 08:15:51 -0400
From: Rob Flory <farmer.rob.flory at gmail.com>
Subject: [MRCA] Mil. Power Supply for sale at Gilbert
To: mrca <mrca at mailman.qth.net>
Message-ID:
<CAFcNxxX3yeiFVVa-xpcTkpKBUis7t_p44KLAE3ttthxgEipMbQ at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Hi, I don't run as much dynamotor stuff as I used to, so I don't feel like
I need this:
PP-2309c/u 0-36V 0-15A
I always found the current meter useful to know if a piece was running to
spec or had a drag(friction or shunt load)
Quirk: It doesn't like it's chassis grounded. Voltage drops to 2V or
so.
Ten bucks. That's only about 16 cents a pound.
RF
------------------------------
Message: 6
Date: Mon, 27 Aug 2012 09:06:41 -0400
From: Ray Fantini <RAFANTINI at salisbury.edu>
Subject: Re: [MRCA] Retransmit
To: "mrca at mailman.qth.net" <mrca at mailman.qth.net>
Message-ID:
<2DE6F17E951D824AAE8B8D0BF7579D810E1393211D at MBX.salisbury.edu>
Content-Type: text/plain; charset="us-ascii"
The URC family of radios (URC-100,101,104 and 110) all have retransmit
connectors that allow two radios to be connected together. I have once set
up a URC-104 on 51.0 to a URC-110 on 145.520 that provided a cross band
platform. The 104 has a tone squelch decoder and when the radio receives
tone it keys the transmitter. The 110 had a regular COS control line that
keyed the 104. The cable has a number but do not know it off the top of my
head but it was something that I built up using just the two cross band
connectors and a five or six conductor cable. The big problem with trying to
do anything on just low band is that you need two offset frequencies and no
radio that operates in the tactical FM band will support this. My RT-1439
(VRC-88) SINCGARS while doing frequency hopping and all that other junk
still won't operate on offsets. The URC family of radios will operate
offsets but that was included for supporting satellite operation and
accommodating the transponders offset. J
ust thinking about this would speculate that the amateur concept of using
repeaters is unknown in tactical military radio?
RF
------------------------------
Message: 7
Date: Mon, 27 Aug 2012 10:27:34 -0400
From: Ken Downs <krtdowns at myfairpoint.net>
Subject: Re: [MRCA] Retransmit
To: Ray Fantini <RAFANTINI at salisbury.edu>
Cc: "mrca at mailman.qth.net" <mrca at mailman.qth.net>
Message-ID: <111B3458-7F85-4018-B8E8-267B00CEA386 at myfairpoint.net>
Content-Type: text/plain; charset=us-ascii
Ray,
You wrote "the amateur concept of using repeaters is unknown in tactical
military radio?"
I never saw repeaters as we amateurs know them in my 20 years, except of
course with commercial equipment for post engineers, military police, etc.
Tactical radios did not support that sort of operation, at least up to 1987
when I retired.
Tactical operations don't normally need a repeater as we know them; the two
simplex freq "Retrans" sufficed to jump mountains or otherwise extend range.
I suspect the main technical reason precluding repeater use was the need to
frequently (in some places I've been, every 8 hours) change frequencies. How
are you going to retune all those duplexers? Plus, the KISS principle is
vital in tactical gear. Observe a new ham/new owner trying to program a new
ham radio ht or mobile rig. Then add factors like him/her trying to do it
while someone else is trying to kill him/her, and, of course, the usual
"tactical weather" (always bad). One frequency, one PL tone (hell, that was
called "new squelch"- "Old squelch" was simply carrier operated.) simple,
"GI proof" operation is essential. Nothing to fight QRM, select various i.f.
bandwidths (with some exceptions), work split, etc. Personally, I think that
gear sucks for ham band use, except for situations like 60 meters. But it's
fun, so w
e do it anyway under the right circumstances.
Ken, W1KRT
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