RE: LF: 73k mystery signal

["john sexton" <computernetworks@excite.com>]

 Hi Jim,
Right now (11.31 utc), 73.315 is clear but will continue to monitor.
73 John, G4CNN

--- On Thu 05/16, James Moritz

wrote:
> Dear LF Group,
>
> The 73.25kHz Rugby signal has been on intermittently lately, and
> sometimes when it is off I have been hearing a strange bleeping and
> warbling signal, centered on about 73.315kHz. The attachment shows a
> couple
> of minutes worth of spectrogram - the frequency span is about 1kHz, and
> the
> signal occupies about 600Hz. The blips on the "carrier"
> frequency are
> actually shifting up and down in frequency by a few Hz, and seem to have
> some sort of modulation applied, although this is hard to see in this
> screen shot.
>
> The signal is about 20 - 30dB over the noise here - Can anyone else hear
> it, or is it some strange form of local QRM? Could it be a communications
>
> mode, or some sort of beacon? Would be interested if anyone has any
> ideas.
>
> Cheers, Jim Moritz
> 73 de M0BMU<73k315.jpg 36.60 KB>

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