[Elecraft] KPA100 oscillation -- NOT fixed

[Bill Coleman]

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: aa4lr at arrl.net
Quote: "Not within a thousand years will man ever fly!"
             -- Wilbur Wright, 1901