"Mike McAuley" wrote in message
ink.net...
Thanks Greg, I'm using Radio Shack remote speakers. They're very
small cube shaped speakers with mono mini-plugs on the end of
about a 10' wire. As I said, they're unpowered. I just have them
plugged into the aux speaker out connection on the radios.
Can you tell me more about the GE MASTR units?

Thanks

Mike

I use to operate a GE MASTR II VHF (110 watt model) mobile for 2 meters in
1980s and early 1990s. When I traded cars, I took out that big trunk unit,
but never installed it in my new car.

Kevin Custer, K3KKC has a very good web site on the MASTR II units (many
have been converted for repeater usage) as well as other GE models. In
fact, my old repeater club installed an old retired GE MASTR PRO (had a tube
final section) thirty years ago .. that worked quite well .. once WB9GGO
(sk) fixed many of its little problems (like cracking the tubes every ten
minutes) !

The MASTR II has a RX squelch logic signal (RUS) that is normally present at
the remote head. With that logic you can turn on a small LED or 12 volt
bulb when the receiver is unsquelched (useful if you have the speaker volume
turned down). GE had an option which was a resistor, bulb and bracket for
mounting in a spare "window" on the remote head and attaching to this logic
line.
RUS is the RX squelch logic signal for the MASTR II is available at J904-8
(RX Unsquelched Sensor). The MASTR II also has another signal called
"Carrier Activity Sensor" available at J901-16, but this signal usually not
used (results in increased chopping of weak signals).

You may have this logic present in your radio, but it will take a schematic
and/or service manual to trace it down and check how the logic is presented
for usage.

Greg