Grinding noise from radio (Microair M760) at low revs

[Philster2001]

Hi, I have an issue where my Microair M760 makes a loud static grinding noise when the PTT is pressed at revs below about 2000. Anyone receiving only hears the grinding noise, no audio. Installation is in Jabiru J170. Coincidentally, the strobe also makes a significant clicking noise when switched on, not sure if that related or not. No issues at cruise power in the air/circuit.

 

Has anyone seen similar issues?

 

Cheers

[IBob]

If there's a loud hissing too, it probably means your coffee is ready???

[RFguy]

sounds like the voltage is a bit low to the radio

together with the strobe noises, sounds like wiring is /bad/faulty .

[Philster2001]

Thanks I’ll stick a meter on it and see if it increase with revs. The volt meter on the panel doesn’t seem to move but maybe the radio is sensitive.

 

cheers

[RFguy]

need to know the voltage at the radio, rather than the battery voltage.

See how close you can get a couple of alligator clips to the actual radio voltage.

Edited Sunday at 05:24 AM by RFguy