14-Channel GTX Issue...

[n9wys]

Hello, all.

I have a GTX portable on which there has been the "14 conventional channel conversion" performed. The problem is: this radio keys whenever the speaker/mic is inserted into the jack. I know the speaker/mic is OK, because it works fine on a non-modified radio.

So the question for the learned group is: What is it about this mod that might cause this? I have both the GTX service and the RSS manuals, but since this is not "OEM", I'm not sure where to even start looking... Any ideas -- other than stop using the speaker/mic?

Thanks!

[Tom in D.C.]

The problem in all likelihood is not the mod. Rather it's the
double jack which is a standard problem on all radios of this
type, GTX, GP300 etc. when the radios get into middle and
old age. Getting at the assembly is a difficult job but you will
have to replace it eventually.

[W6JK]

I agree, it sounds like a jack problem.

'JK

[n9wys]

OK - I guess some DISassembly is required, then.. :-/

Thanks all!

[AEC]

Disassembly is more than just a word on these model types, it's a complete adventure!

That assembly is a single module, and there are no single jacks available as a replacement for this.

You will need a good vacuum desoldering station to properly effect the repair, or you will end up with desoldered parts, or broken traces, or both.

AThe shield covering the assembly has to be removed first, then you can begin working on the actual part.

The 'module' sits below the antenna connection as well asthe grounding tab, with the PA assembly and heatsink in close proximity.

The two uppermost side buttons may also provide some interference to your effort as well....

You will have to desolder the contacts above the module as they will block access to the connections.

Speaker/Mics rarely cause automatic keying, and in this radio type, it's usually caused by a defective jack assy.

[n9wys]

Wonderful... Thanks, Ernie for the heads-up.