GTX M11 Mobile Radio Mic Hangup Circuit...

[Tom in D.C.]

Can someone tell me how I can defeat the mic hangup circuit on this
radio so that the receive PL stays active when the mic is not grounded?
I have no convenient way of grounding the mic on the car's M11 so I get
a lot of hash, burps, AVL bursts, etc. which is annoying.

My desk M11 works fine and does not show the monitor symbol because
I'm using a Maxtrac 3000 desk mic on it.

[kcbooboo]

I would just solder a short jumper across the hang-up and ground pins on the MIC jack in the control head. That will defeat it forever. You'll have to use the front panel MON button to get the radio in or out of tone decode.

This works very well on MaxTracs, and since they use the same pins on the MIC jack, it should work just as well on a GTX mobile.

Bob M.

[fineshot1]

I know on some motorola mics there are a couple of either solder pads or shorting pins you can use to be in PL decode full time except when the monitor button function is used. I know some of the maxtrac mics are like this but unsure of the GTX mobile mics....dan n2aym

[Tom in D.C.]

Thanks for the information. I should have figured it was as simple as that.

I see by the good old Batlabs site that the hook switch comes out to pin 14
on the 16-pin connector, so I should be able to get full time receive tone
squelch by grounding pin 14 permanently on the back of the radio. Live and
learn.