Looking at the AM transmitter frequencies you discussed during our morning QSOs, I see the following as one intermod combination: 1420 + (2 x 1280) = 3980 kHz. I tend to believe there is some structure or structures nearby that generate and re-radiate the harmonics and mixed products.
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Looking at the AM transmitter frequencies you discussed during our morning QSOs, I see the following as one intermod combination:
1420 + (2 x 1280) = 3980 kHz. I tend to believe there is some structure or structures nearby that generate and re-radiate the harmonics and mixed products.
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