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There's most likely a PN junction somewhere in the SignaLink acting as an RF detector. Since you say the audio side wasn't connected to anything when receiving the 20m signals then the USB cable or power cord is probably acting as an antenna. Could be both for all I know.

Maybe get some RFI suppression ferrites and run the various cables through them and see if that stops the mystery signals? Might work, might cost you a few bucks only to have the mystery deepen.

[QUOTE="TM86, post: 804019, member: 41978"] There's most likely a PN junction somewhere in the SignaLink acting as an RF detector. Since you say the audio side wasn't connected to anything when receiving the 20m signals then the USB cable or power cord is probably acting as an antenna. Could be both for all I know. Maybe get some RFI suppression ferrites and run the various cables through them and see if that stops the mystery signals? Might work, might cost you a few bucks only to have the mystery deepen. [/QUOTE]

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