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Old 13th Jan 2018, 11:40 am   #13
G8HQP Dave
Join Date: Sep 2008
Location: Solihull, West Midlands, UK.
Posts: 4,766
Default Re: Ultra VLF signals?

36kHz and 45kHz are both multiples of 9kHz, the spacing used on MW and LW in Europe. They are very likely to be intermodulation.
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