GME TX 4200 fault

Kev,
Check to see you haven't pushed a button and put it onto silent.
Cheers Dave...

Check you have enough power, big enough power cabling, and battery not low. Have seen the same thing when aux battery was low, and the engine was not running.
Cheers

Mickey

Kev,
You may have damaged your co-ax during the shift.
Easy to check with a multimeter. I would suggest that the centre wire in the co-ax is broken at the PL259 connector.
Check with a multimeter to see if you have continuity between the centre pin on the PL259, and the antenna.

HTH

Hi there Sir Kev,
as you are a Queenslander we should ask the obvious, "Is it turned on?"

lol

Seriously though my Uniden has pooped itself and for some reason now I receive on one channel and seem to transmit on another.
Something needs fixing in it.
Didn't bend a pin in the mic plug or push one out did you when you reconnected it?


Rgds

Sounds like a microphone cable/PTT switch fault. Have enjoyed the multiple uninstall game myself many times searching for a hidden fault like this.

Maybe check the continuity of the coax cable from centre of plug to antenna base and also check that the centre conductor is not shorted to the shield (or earth)

In the olden days of 27mhz Cretins Band, you would be alerted of an antenna short or open circuit by a spectacular display of sparks and smoke as the final transmit stage went to CB heaven. I believe that modern technology has aleviated this however and simply will not work if there is a fault in the antenna system.

Craig

Dry joints on GME mic PTT switches are fairly common. I've fixed quite a few - including one at Well 15 on the Canning for a very grateful bloke in an adjacent camp who'd only been able to listen to his mate for 2 days on a brand new radio but not talk to him.

There's a design fault in which the switch pins are also the mechanical security for the PTT switch to the board, as they don't solder the location pins on the switch housing to a pad which means they aren't mechanically anchored and all the PTT switch use fatigues the solder joints.

It's also amazing how often these faults will reveal themselves coincidently when you have done something else. They are also intermittent often making them harder to track down.

But you said you have changed the mic so it's not so likely to be the cause.

Good luck with the hunt. Are you receiving signals from distant sources or just local stuff like maybe a hand held you are using to test? If the coax has a short or the connection is separated in the plug you won't receive from distant sources.

Does the display disappear when you transmit - which may indicate a higher than acceptable resistance where you sourced your power from? This can manifest as having power while at near zero load - ie in Rx mode - but dropping voltage across a bad connection when transmitting. This can occur when tension on the supply wire from it either only just reaching or being cable tied in too tight reduces spring pressure in your in line glass fuse holder too.

Dave