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A very strange occurrence....

Allen B

762 Florida
Dec 20, 2020
49
84
28
37
I sometimes run JS8 call on 11m. A few times now I have shut down my radios (power supply disconnected from wall), but my SignaLink is still on. Yesterday I left for work and still received a whole bunch of 11m meter activity. A couple of weeks ago I had no radios on my desk and just the SignaLink was sitting there, it was on but the audio wasn't connected to anything and I still received some activity. After looking up the call-signs on pskreporter I find that they were on 20m. That's with absolutely no radio whatsoever! This is a repeatable thing, I will do it again today and post a screenshot later this afternoon of what I get today.

My question would have been, "Is it possible for a radio to somehow still decode or rectify a signal when off?" I would have though SSB would need a local oscillator running. But then what explains the SignaLink picking up 20m signals from half way across the country? None of this activity I see with no radio is local.

Very strange.
 

TM86

Supporting Member
Jul 6, 2014
1,118
1,522
173
Payson, AZ
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.
 

Allen B

762 Florida
Dec 20, 2020
49
84
28
37
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.
I actually do have ferrites on all the cables at the back of the SignaLink. So I guess now the mystery deepens.
 
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  • @ BJ radionut:
    I hope he did not ask that question on the "ZED" he would get vaporized...75% telling in some "polite way" are you going to put up a "REAL" antenna? The rest telling him that's the greatest antenna ever with my 7300o_O:coffee:
  • @ Roadstar:
    still the dx wa 135 antenna
  • @ cbjunkie:
    test
  • @ cbjunkie:
    the guy qrming 27385l is on 27383 is Matt K2YCK in New York for info very bad operator causing intententional
  • @ cbjunkie:
    bleedover to 27385lsb