For what it is worth, the dominant 1820 signal heard within
a a few thousand miles of the Caribbean is from Radio 91 in
the Dominican Republic.
This is an ACTUAL harmonic from a homebrew 910 kHz
transmitter that was installed late in 2003.
There are actually a dozen or more harmonics or IM products
that are the transmitter's fault on 160 meters.
I'm not saying problems like this can't be in a receiving
system. I'm just pointing out many transmitting systems have
flaws and radiate on 160 meters. The Spanish Radio 91 on
1820 is a good case of a defective transmitter.
73 Tom
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