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Author Topic: Motorola GR900 repeater interface ELN4570 (mobicom) cable  (Read 1755 times)
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Posts: 4

« on: March 08, 2017, 08:37:00 PM »

Hi dear radio fellows, first time i write here and what a shame, it's a tricky question  Roll Eyes

Some time ago I've got a Motorola repeater housing GR900 with 2 GM900 radios.
I also have an interface Motorola ELN4570 (built by mobicom ltd UK).
This interface was often used as a TRC (tone remote control) with a single GM900 and centro desk consoles in Europe
but i've seen this ELN4570 interface in other GR900 repeaters and so i believe it can do both (TRC + repeater)
(The interface is not the so called R.I.C.K. nor the T.R.I.C.K, which where also available)

My problem is that i don't have the connection cable kit between the interface module ELN4570 and the 2 GM radios.
I only have a cable for one GM900 used in a GM900 TRC application, which is working fine. I have the
manual for this ELN4570 in TRC mode but the wiring schema/pinout of 2 Radios for a repeater is not shown.
I believe it is part of the GR900 repeater manual, which i don't have.

The cable kit includes a 37 pin SUB-D connector for the ELN4570 interface and cables to each 25 pin SUB-D accessory connector
of both GM900's...

BTW: I know that it would be easy to build a simple interconnection cable between both radios with some wires for PTT, COR, audio and
ignition control instead of a full featured repeater controller but i like the idea of using the repeater with configurable carrier delay/hang-time, knockdown
and the TRC feature with a desk console in one system.

Now my question is: Does anybody have the pinout from the GR900 manual or elsewhere for this cable? I would really be happy ;-)

Thanks for reading and stay on air!
regards, waverider

ps: I've attached a picture from the interface and part of the cable so you maybe know from what i'm talking.
« Last Edit: March 08, 2017, 08:54:41 PM by waverider » Logged
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