[MRCA] Retransmit

[WA5CAB at cs.com]

Eugene,

U-183/U is the chassis male connector that mates with U-229/U, not a cable. 
 I don't have any idea what the cable in the photo is but it is undoubtedly 
CX-something.

Robert

In a message dated 08/28/2012 19:50:46 PM Central Daylight Time, 
w2hx at w2hx.com writes: 
> Ok, so I confirmed that the PRC-138 has the same pinout as the Rt-1439 
> (prc-119).  So I just bought some cables, CX-13298, which I believe to be 
> cross over cables in the way Al has described below.  If luck is on my side, 
> it may be as simple as connecting the two radios using this cable and maybe 
> also setting a squelch level on the PRC-138.  If I can get this working, I 
> can run the PRC-138 with my 125W amp and the RT-1439 with my 30W amp.  Fun 
> fun!
> 
> BTW: I see the U-183 cable mentioned. But also on PRC68.com I see the 
> following 
> http://www.prc68.com/I/FillCbl.shtml
> " This is a cryptographic fill cable with a U-183 (6 pin U-229) on both 
> ends.  It has all 6 pins wired straight through."
> 
> Straight through seems to not be what we want.  But maybe there is another 
> version of the -183 or maybe a misprint on the website.  According to the 
> sincgars manual, the RXMT cable is the CX-13298 (I have two coming to me).
> 
> 
> 73 Eugene W2HX
> 
> 
> -----Original Message-----
> From: mrca-bounces at mailman.qth.net [mailto:mrca-bounces at mailman.qth.net] 
> On Behalf Of Al Klase
> Sent: Monday, August 27, 2012 4:53 PM
> To: Military Radio Collectors Association
> Subject: Re: [MRCA] Retransmit
> 
> Eugene,
> 
> From: http://www.prc68.com/I/Audio.shtml#Ret
> 
> QUOTE:
> On some radios there is a connector labeled RETRANSMISSION that is used 
> with other similar radios to make a simplex repeater.
> 
> The (U-183) retransmission cable used with the RT-1439 is cross wired as
> follows:
> 
> B ->D
> D<-B
> E->C
> C<-E
> F--F (TTL Hi = Analog mode, TTL Low = Digital mode) A--A END QUOTE:
> 
> I think we can assume similar pinouts to the standard  to the standard
> U-228/229 audio connectors;
> 
> Pin
> Audio Function
> A - Ground, Negative Battery
> B - headphone audio
> C - PTT (ground to send)
> D - Microphone audio
> E - Vehicle B+ on the PRC-68 &PRC-126,
> Retransmission (switch to ground when receiver squelch opens) on PRC-25, 
> -77, RT-246
> 
> There's a potential issue with audio levels.  Perhaps, the RF-1439 retrans 
> connector takes care of that.
> 
> Al
> 
> 
> On 8/27/2012 2:13 PM, W2HX wrote:
> >Hey guys. I've been doing some research on interconnecting one of my 
> harris HF units with my RF-1439 set up (VRC-89 I think).  The harris RF-5020 
> has this capability I have learned. J5 carries a retransmission key line 
> output as well as 4 balanced audio signals. 2 RX audio and 2 TX audio. In 
> addition, through menu options, I can set these audio levels to either 0 dBm or 
> -10 dBm.  Interestingly, the PRC-138 does not seem to have a retransmission 
> capability which is somewhat surprising.
> >
> >As Ray noted, the 1439 does also have retransmit capability.  However, 
> despite the millions of pages of various TMs I have on singcars, I cannot 
> seem to find any technical details of the pin outs for the RXMT connector (6 
> pin) and what audio levels it is expecting. Anyone have technical details on 
> this?
> >
> >Also, while I'm here, anyone know the MS connector number for J5 on the 
> harris 5020? I looked in my operations and maintenance manuals and there was 
> nothing.  I've already floated the question on the harris reflector.
> >
> >
> >73 Eugene W2HX
> >
> >
> 
> --
> Al Klase - N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
> 


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