Advice please from experts:

Has anyone had any radio issues using the Monroy ATD 300 poor man’s TCAS, with the audio lead plugged into the headset socket?

I have a loud(ish) squeal on radio Tx, and an expert suggested the SPA 400 needed changing, if the squeal disappeared with the IC switched off. It did, and changed the SPA 400. However it still squeals.

Tried a little trouble shooting yesterday, and it seemed the ATD 300 audio plug might be the cause, in that when removed the squeal disappeared. However that was on ground engine off. The alternator is both internally and externally suppressed.

 

Dom Crain

VH-CZJ

 

Thanks Gre(a)yhawk