[MRCA] PRC-104B CONT pinout, was: Audio "Y" Cable For PRC-104
Peter Gottlieb
kb2vtl at gmail.com
Thu Jan 21 19:26:45 EST 2016
As others have expressed an interest, I figure I'll post to the group.
The PRC-104B "CONT" connector is meant to connect to the STAJ hopping
controller. This apparently never made it to production, VERY few are still in
existence, and nobody has ever seen the cable which connects them. The
connector is a complete custom item and I can't even figure out who made it.
None I have examined have a logo, only a part number which is specific to the
PRC-104B.
The pinout is as follows:
1: 1.25 MHz clock out +
2: 1.25 MHz clock out -
3: ground
4: Serial Data in +
5: Serial Data out +
6: Serial Data out -
7: ground
8: Serial Data in -
9: ground
10: ground
11: Modem Transmit Audio
12: ground
13: Modem Receive Audio
14: ground
15: ground
16: ground
17: +28 V out from radio
18: ground
19: Remote mode select
The + and - signals are bipolar RS-422 digital data. Protocol is high speed
using the 1.25 MHz as a bit clock, byte oriented, odd parity. This is to allow
100 hops per second (!). Nobody seems to know any more than that, but I'm
slowly working on it.
Pin 19, when grounded, puts the PRC-104B into remote controlled mode. If you
ground this pin the "RMT" indication on the LCD turns on and the buttons are
inactive.
Pin 17 supplies power to the hopping controller.
Pins 11 and 13 are line level audio to and from the analog modem in the hopping
controller, used for sync training for the hopping sequence.
Hope this helps.
Peter
On 1/21/2016 5:05 PM, Carl Deitrich wrote:
>
> Peter,
>
> THANK YOU VERY MUCH!!!
>
> 73,
>
> Carl
>
> NQ3U
>
> *From:* Peter Gottlieb [mailto:kb2vtl at gmail.com]
> *Sent:* Thursday, January 21, 2016 17:03
> *To:* Carl Deitrich <carldeitrich5 at comcast.net>
> *Cc:* scottpastor <scottpastor at gmail.com>; mrca at mailman.qth.net
> *Subject:* Re: [MRCA] Audio "Y" Cable For PRC-104
>
> I have the pin outs and can send out tonight.
>
> Peter
>
>
> On Jan 21, 2016, at 4:52 PM, Carl Deitrich <carldeitrich5 at comcast.net
> <mailto:carldeitrich5 at comcast.net>> wrote:
>
> Peter,
>
> Thanks for the reply. It would be nice if we could at least find the pin
> outs for that little 19 pin doo-dad J That’s all I really need is some
> line out audio.
>
> 73,
>
> Carl
>
> NQ3U
>
> *From:* Peter Gottlieb [mailto:kb2vtl at gmail.com]
> *Sent:* Thursday, January 21, 2016 14:50
> *To:* scottpastor <scottpastor at gmail.com <mailto:scottpastor at gmail.com>>
> *Cc:* Carl Deitrich <carldeitrich5 at comcast.net
> <mailto:carldeitrich5 at comcast.net>>; mrca at mailman.qth.net
> <mailto:mrca at mailman.qth.net>
> *Subject:* Re: [MRCA] Audio "Y" Cable For PRC-104
>
> Line audio comes out of the control jack but the connector is completely
> unobtanium as it was a custom design and never manufactured in any
> significant volume before being discontinued.
>
> Peter
>
>
> On Jan 21, 2016, at 1:55 PM, scottpastor <scottpastor at gmail.com
> <mailto:scottpastor at gmail.com>> wrote:
>
> Carl,
>
> I'm in the same boat, and the cable you describe seems to be
> unubtanium-later. A company called tactic ale engineering
> (www.tacticaleng <http://www.tacticaleng/> dot com) manufactures
> them new, for the le, low price (!) of $175.00 each. Fortunately,
> there's an alternative. The Harris company makes a "y-cable that
> looks different, but performs the exact same function, and it's
> much more untrainable. Search for "Y" Adapter P/N 10372-1230 and
> you should find some. Last time I checked, Scott at American
> Milspec had some for around $65, and I bought mine off of
> everyone's favorite auction site for about $45.00. I'll try to
> attach pcs of mine for reference. It looks ugly, but it does the
> trick.
>
> Now, all that said, if anyone has a line on the other Y-cable, I
> would be interested in knowing where it can be obtained.
>
> Or, does anyone know how to get audio out of the "Control" jack on
> the front of the PRC-104b?
>
> 73
>
> Scott Pastor
>
> <image1.jpeg><image2.jpeg>
>
> scottpastor at gmail.com <mailto:cottpastor at gmail.com>
>
>
> On Jan 21, 2016, at 6:49 AM, Carl Deitrich <carldeitrich5 at comcast.net
> <mailto:carldeitrich5 at comcast.net>> wrote:
>
> All,
>
> I recently acquired a PRC-104B with the digital display that only
> has one “Aud” jack and one “Cont” jack. I’d like to use the rig
> for CW and as such, I believe I need a “Y” cable. So I can attach
> the key and handset or speaker. One of my green radio friends has
> one and the numbers on the cable are as follows…
>
> 56996
> ASSYB4011697
> MFR92837
> This cable consists of two U-228/U connectors (female), and one
> U-229/U (male).
>
>
>
> Does anybody know where one might find one of these “Y” cables or
> have an extra one that they’d be willing to part with?
>
> I’ve looked at all the usual locations on-line and have come up
> empty handed. Hopefully this cable isn’t made from unobtanium J
>
> 73,
>
> Carl
>
> NQ3U
>
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