Of course, any frequency ending in a zero is almost guaranteed to have a
constant broadcast station harmonic. I almost always hear them here,
especially at night. And very often, that BC carrier is stronger than
stations zero-beat with them calling CQ! Better to be slightly off of
zero,
if you're QRP and want to be heard.
I could never understand that either. Anything USA on the 10's is likely to,
sometime or another, have a mixing product or harmonic.
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