GM300 monitor setting?

[RadioChief55]

I'm using a GM300 connected with a rj45 cable into the microphone port of the radio to a SignaLInk interface to work with a digital radio application. My question is, is there a setting in the programming software or another way to have the radio receive with the PL on not open
pl/CSQ ? As it does when the microphone is connected and in its cradle. Thanks

 

[mmckenna]

Short pins 3 & 4 on the RJ-45.
Pin 3 is the "hook" pin. Pin 4 is ground. That will make the radio think the microphone is on hook.

 

[RadioChief55]

Thanks for the info. Can I do it through the pins in the back?

 

[N5XPM]

It depends a little based on how many channels the GM 300 model is (8 or 16 channel).
Please see the pinouts here:

http://www.repeater-builder.com/motorola/maxtrac/gm300-info/gm-acc-conn.jpg

 

[mmckenna]

Thanks for the info. Can I do it through the pins in the back?

Sure, if you were good with a small soldering iron. It would be easier, and easier to return to normal service, if you just short the pins. It was common to just use an RJ-45 plug with a loop of wire in the front of those, and just pull audio off the rear 16 pin connector. But, whatever works for you.

 

[Golay]

If the OP isn't going to be hanging the mic up, do what I do. I take a small paper clip and wrap it around the clip on the back of the mic, that mimics the mike hung up. No need for programming, soldering, etc. Just remove the paperclip to re-enable.

 

[mmckenna]

If the OP isn't going to be hanging the mic up, do what I do. I take a small paper clip and wrap it around the clip on the back of the mic, that mimics the mike hung up. No need for programming, soldering, etc. Just remove the paperclip to re-enable.

OP isn't using a microphone. He's got it connected to a SignalLink box using an RJ-45 cable.

 

[RadioChief55]

Thanks for all this great info. I did short 3 & 4 on the RJ-45 cable. But I must have got another wire too, I don't have PTT working on the radio now. I ran out of time today to look further into the issue. I'll have more time tomorrow to check it out. Thanks again.

 

[mmckenna]

PTT is on Pin 6.

http://batlabs.com/images/gm300mic.gif

 

[RadioChief55]

If I jump 7 to 14 will that do the same thing as shorting 3 and 4 on the RJ45?

 

[GmanX]

Same thing

 

[RadioChief55]

Ok, thank you all for your help and great info. I figured out what I was doing wrong. I actually cut the two wires and shorted them. It did close the PL but it wouldn't transmit. Then I thought about it and hooked the two wires back together and shorted them across leaving them intact through. That was it. Thanks again, I always learn when I ask questions on this great forum.

 

[mmckenna]

Ok, thank you all for your help and great info. I figured out what I was doing wrong. I actually cut the two wires and shorted them. It did close the PL but it wouldn't transmit. Then I thought about it and hooked the two wires back together and shorted them across leaving them intact through. That was it. Thanks again, I always learn when I ask questions on this great forum.

Yep, it needs the ground connection for the PTT.

The rear 16 pin connector will work, and it's also a good way to connect audio. You can buy the 16pin connector kits pretty cheap off e-Bay.