Static on limited frequency range?

[catmandu]

All of a sudden, the LED nav lights are causing static on GTR200 #1 between 121.725 and 127.775 (none noted on GTR200 #2).

Was there not a discussion about that here sometime ago? Tried some keyword searches but no luck. Just trying to minimize my troubleshooting time, thanks.

 

[GeorgeC]

121.5 ELT?
disregard

 

[catmandu]

121.5 ELT?

There is one installed, yes.