At 12:45 09/01/2002 +0000, you wrote:
Interesting that there appears to be no sign of the callsign ident.....
Dear Andy, LF Group,
I wouldn't be too surprised - even in 50Hz audio bandwidth, the signal was
quite broken up by noise, and I doubt if I would have been able to copy the
fast CW ID. In my experience with QRSS signals, a fast CW ID produces
rather vague blobs at the sideband frequencies on the spectrogram even if
it goes on for a long time - so since this CW ID would have been very
short, and the FFT uses a 23s run of data to generate each pixel, the
sidebands would be very faint and easily lost in the noise on this
spectrogram. On the un-edited image, there are several blurs that could be
the ID, but which might equally well be noise.
Cheers, Jim Moritz
73 de M0BMU
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