SL40 squealing on transmit

[Spriteah]

Hello peoples,

 

Im having problems with a SL40 that sometimes (not always) has a high pitched squeal on transmint. It does not seem to be feedback. I have david clark headsets. It wont occur if both mikes are out.

 

Any idea's.

 

Jim.

 

 

[Guest Maj Millard]

Have you changed headsets or radio/intercom units recently ?. Sounds like it could be microphone related. Either an Electric or dynamic mic is suitable for you'r radios, but not both.

 

 

[newairly]

It could be RF getting into the mic/intercom. This could happen if the antenna or cable is faulty causing RF to be radiated away from the antenna. Maybe something has changed.

 

I have a similar problem with an Icom A20. I can not use a headset with the built in whip, but it is OK with an antenna mounted remotely.

 

Good luck. These things can be very frustrating.

 

Phil

 

 

[Guest Cloudsuck]

I had the same thing with my A200 when I installed it in my Tecnam. I found the mic gain pot on the outside of the casing and peeled back the little silver sticky sticker and screwed back the mic gain a bit. Problem solved.