Mike posted:
Thank you for the reply. That is what I have heard from others too. But
how
come my new SX110 (in 1961) and my current SX99 (same circuit) doesn't "block
out"?
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Very good question. Could it be that some version of the receiver used a dual
gang switch that disabled the AGC when the bfo was turned on? If I can find a
SX99 schematic I'll check for differences.

Don