Hi Alan and LF group,
yes, exactly the same observation on CFH here in Nuernberg.
To cope with the current high level of QRN, I have now implemented a special
averaging strategy: Each column in the final spectrogram is a 15-second
weighted power-average of about 500 10.8Hz-resolution FFT's. The weight factor
applied to a single spectrum is taken proportional to the inverse square of its
total power. In effect, this type of averaging strongly prefers the quiet
periods, and practically clears out the crashes.
73 de Markus, DF6NM
Alan Melia wrote:
Hi all despite a definite "switch-off" at about 2400z on the 12th, I was sure I
saw a weak FSK trace on ARGO at about 2320z last night (13th) My logger was started but
the plot is wery weak. The line definitely seems to be above the noise, but at such low
levels I cannot be sure that I was not measuring something else.
Can any of the N.American stations confirm activity of CFH last night?? If this
is confirmed, this is by far the lowest signal level received, and there is no
history of them ever running a QRP mode.
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