[MRCA] Retransmit

[Ray Fantini]

All the Motorola URC stuff uses the same configuration on retransmission connectors:

A = Ground
B = Fixed level Audio out ( to the slave  transmitter)
C = PTT input
D = Audio input (from slave receiver)
E = COS carrier operated switch (controls PTT on slave)

Goes right along with U-183 cable. On the URC radios the audio levels are all fixed and are independent of local control settings. Thinking I can put together a cable between the RT-1439 and the Harris and try it out. The URC-94 has a squelch and it works in the HF SSB mode, just have to use the big stupid multi pin connector on the back of the Harris and run that to the RT-1439, if it all works without issues can have a 100 watt HF Harris on 60 meters and a 70 watt VRC-89 on 51.0 operating cross band . biggest problems I have is that I have no antennas for any of this stuff.
RF
-----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