[MRCA] Retransmit

[Al Klase]

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/