[uk_figs]

This past weekend I noticed some crackle/static when transmitting, also heard by the people I was flying with. Noise went away when I switched off the intercom also confirmed by the other pilots. I have the PS 3000 intercom with the SL-30. I have not noticed this before and have made no system changes, it did seem that the noise occurred when I checked the plugs were seated in the sockets like a poor connection but did not occur with the intercom off.
Any suggestions on what to check would be welcomed.

 

[kai]

Do you have that noise only while transmitting, or also during normal intercom function?
Check at first all ground at the intercom and your sl30. At best with a milliohmmeter. The resistance should be max 2.5mOhms.
Could be also a bad intercom.

These kind of failures are sometimes frustrating to find...

Kai.

 

[az_gila]

Also check that the mic and phone jacks are insulated from the panel as required by the installation manual..

 

[uk_figs]

Follow up

Flew today and system seemed fine, did check the mic connection was secure and tight which it was. Connections are isolated and system has worked fine for 3+ years. Still noticed some crackling when I pulled the mic connection so I cleaned the headset plug and system seems OK, could condensation cause this as the headset stays plugged in but my hangar is not insulated and I get condensation on cold metal in the winter.