|To:||"[email protected]" <[email protected]>|
|Subject:||Re: LF: Strong signal on 137 kHz|
|From:||DK7FC <[email protected]>|
|Date:||Sun, 06 Apr 2014 21:31:31 +0200|
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John,Last night i've checked my 50 Hz sidebands (actually 100 Hz) on LF by using SpecLab and a Tecsun PL660 receiver, both running on batteries (ferrite antenna) and coupled via a cable.
The sidebands are at -40 dBc, see attachment.So maybe the problem is on your side. I remember a similar effect by MF WSPR decodes by a EA station. From that station i'm often getting 2 decodes in the same time slot, beeing 100 Hz distant and just 10 dB or so in SNR difference, which is also not caused on my side... Maybe a galvanic coupling with some mains harmonic currents on the antenna cable?
73, Stefan/DK7FC Am 30.03.2014 23:25, schrieb DK7FC:
[...] I can't explain the -20 dBc sidebands. I've measured my sidebands to be -35 dBc some time ago and didn't change anything on the LF setup. I'll check it soon again. 73, Stefan/DK7FCAm 30.03.2014 13:00, schrieb John Rabson:This morning at about 0745Z I received a signal which seemed to be QRSS. It would have been a strong signal except that I’m still suffering from severe QRM. I was unable to identify it, but there were traces of 50 Hz side bands about -20 dBc. This was the first signal I had received for some weeks. I’m still hunting the source of interference. 73 John F5VLF
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