Hi Steve,
Assuming you listened long enough to hear the station's
call letters or ID slogan you can do a "Google" search and
probably learn their assigned frequency, which is likely to
be 900 kHz.
It's possible that the 1800 kHz signal is a mixing product
involving strong external signals, but I'd suspect a simple
2nd harmonic. Do you have the general coverage module
in your K3?
Second harmonics from BC stations are not uncommon,
especially when using a "good" antenna on 160M. (;-)
73! Ken Kopp - K0PP
elecraftcov...@rfwave.net
http://tinyurl.com/7lm3m5
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