I've noticed that I get some sort of RF feedback spike when using the SB-220 and keying up in sideband mode. It's enough to trip my SWR alarm in my wattmeter. What is odd is that it doesn't happen on keydown CW. The problem also gets worse when keying up in sideband mode with mic gain turned down lower. If I raise mic gaini, the RF feedback isn't as bad and the alarm doesn't trip as often. Thoughts?
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