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You might try to get in touch with Doug, he is very sharp and seems to always come up with mods for radio's that others can't. He was the first guy to come up with a dual mosfet mod for a Galaxy 959, maybe he already knows for your 3900.
Hello gentlemen and Ladies. I have the dreaded RCI-2990 receive issue where my radio gets distorted when people get close to my location. I found the C90 Capacitor, but I can not for the life of me find the C89 capacitor. Can or does anyone have a picture of the exact location of C89 ? Thank you in advance, Wes
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