Will,

That's what I was beginning to suspect as well. I would definitely appreciate any schematic / circuit design for an amp that would allow this.

Thanks... Glenn

Will,

I assumed that was the problem, and yes, I'd love to have a circuit for the amp. If you could see your way clear to send it my way, I'd be very appreciative.

On another tangent, and this is just throwing it out there... would the audio output from a PC sound card work? My thinking is that it ...

Ok, that makes sense... thanks.

Does anyone know of any lightweight headset that will work with the CM300.

Ideally, I'd like something like this;
http://www.novacommunications.com/Two-Way-Radio-Two-Way-Radio-Accessories-Headsets/c13_552_542/p275/53865-HEADSET-WITH-SWIVEL-BOOM-MICROPHONE/product ...

Bill,

Thanks for the quick response. That is the GIF I used to originally wire the plugs / switches.

I've 'straight' wired all the wires in the RJ45 and introduced the switches between (6) PTT and (4) GROUND to transmit.

This seems to work well, although the actual 'audio' from the mic doesn't ...

Hello all,

I work as a race controller at a motorsports park and we use the CM300 series radios.

The current setup has 5 radios with 5 mic's lying around. I'm trying to incorporate 1 mic for use with 5 radios.

I've built a 'switch box' which has an (1) RJ45 INPUT and then using five simple ...