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Old 17th Jan 2018, 4:33 pm   #17
unixmanuk
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Join Date: Jan 2012
Location: Worcester, Worcs. UK.
Posts: 112
Default Re: Ultra VLF signals?

You may be referring to the Mizuho "Sky Coupler KX-3" like the one I have. Has a LF switch on it, that introduces a LPF giving a sharp cutoff above IIRC 500kHz.

Years ago, I used this and a comms receiver to decode a press fax transmission service on 139kHz, but that's long gone.
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