Re: [VAL] Hum

[Uwe Salwender <salwender@xxxxxxxxxxxxx>]

Duane,
Make sure that the Radio's chassis is grounded. Make
sure teh Antenna is grounded securely. Aluminum has a
tendency to corrode, and if the radio's metal chassis
is not grounded properly, it will seek it's negative
potential through the antenna shield, which will
decrease the shield's function.
Another possible problem might be a defective or about
to be defective Univolt. 
It's supposed to deliver 12VDC, which shouldnot be
humming! There might be an A/C content in the voltage.
Also, make sure the Univolt itself is grounded
properly. 
Best wishes!
Uwe Salwender
Orange, CA