On Nov 19, 2006, at 12:25 PM, Vic K2VCO wrote:

However, now I have a new problem: on 21 MHz, there is an intermittent oscillation when running 100w output. It manifests itself as a loud 'bzzzat' that's sometimes heard when the rig switches to receive, associated with lots of LEDs on the KAT100. Dropping power to 70W seems to prevent it.

Are you sure your antenna system isn't arcing? If you have an SWR shift under power, that's usually a good sign of an arc.

Bill Coleman, AA4LR, PP-ASEL        Mail: [EMAIL PROTECTED]
Quote: "Not within a thousand years will man ever fly!"
            -- Wilbur Wright, 1901

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