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I had a similar problem with a Uniden 520 recently. I took it to Justin to look at (I had gotten it used) to see if he could figure out why it would squeal with the KL-200p on. The problem was in the way the bonehead tech who worked on it originally had lowered the carrier for use with the amp. The mods were causing self oscillation on certain channels, which exhibits itself as squealing. He fixed it up and after a few minutes of repairing the junk mods, it worked great! Maybe the 510's you had were set up with the same type of problem?
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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