Push to Talk intermittent.

[billnaz]

I'm dealing with an infuriatingly intermittent PTT problem. It only occurs after about an hour of flight. Failure is as if the PTT button is failing, with activation cutting in and out. I've already switched the switches with no change. I suspect a bad ground, but dread the thought of tracking that down. Any ideas from the brain trust on path to follow in trouble shooting?

[Plummit]

Originally Posted by billnaz

I'm dealing with an infuriatingly intermittent PTT problem. It only occurs after about an hour of flight. Failure is as if the PTT button is failing, with activation cutting in and out. I've already switched the switches with no change. I suspect a bad ground, but dread the thought of tracking that down. Any ideas from the brain trust on path to follow in trouble shooting?

Do you have multiple radios in your plane? Does it happen on both radios? What audio panel?

-Marc

[flyinga]

Check wiring on your mic plug; especially ground.

[Ron RV8]

Check voltage to radio. Similar problem traced to high resistance breaker switch...

[billnaz]

Thanks for the tips. I may have found the problem. Seems some dummy omitted the fiber washers from the mic plug installation. Assuming this is the origin, it?s interesting that the paint on the part provided enough insulation for 12 years.

[BobTurner]

Originally Posted by billnaz

Thanks for the tips. I may have found the problem. Seems some dummy omitted the fiber washers from the mic plug installation. Assuming this is the origin, it?s interesting that the paint on the part provided enough insulation for 12 years.

The function of the washers is to eliminate potential ground loop noise. It should not affect the PTT function. Check the ground wire.

[newt]

Push to talk is supposed to be intermittent

- mark

[billnaz]

Originally Posted by BobTurner

The function of the washers is to eliminate potential ground loop noise. It should not affect the PTT function. Check the ground wire.

Will do. Thanks.