On Mar 22, 4:14*pm, "D. Peter Maus" wrote:

* *Check the antenna select switch, and the DX/Local switch. It
sounds like you have some oxidation in your unit. These switches, if
oxidized, will produce the very symptoms you describe, especially
true if FM is now working.

* *Throw these switches several times. Move the toggle in a circle
until you get some change in the noise.

* *I experience this regularly with my own Sat 500.

Could you get the same results with a squirt of cleaner in the switch
innards?