Dear Markus, LF Group
At 16:47 26/03/2003 -0500, you wrote:
tonight the band seems to be plagued by a high level of background QRN.
Not the usual distinct static crashes, but rather a continous static
crackling reminiscent of old 78-rpm shellack records. This type of noise
has been present during some nights, but not often. Its southerly angle of
arrival went along well with the usual explanation of very distant
lightning activity.
I have noticed similar noise on the band here also during the past few days
- the background band noise seems to be ~10dB over the usual levels,
swamping the Loran chatter that normally sets the noise floor, but can
"switch" on and off over a period of a few minutes. It seems to occur
during both the day and night time. I have been trying to record
spectrograms of it; unfortunately, some local mains noise sources also
produce a similar effect on the spectrogram, so it is difficult to tell
which is local and which is distant, unless you are actually listening to
the RX audio.
I am slightly relieved it appears to be a distant natural phenomenon,
rather than yet another local noise source - hopefully it is not permanent!
Can anyone else hear it too?
Cheers, Jim Moritz,
73 de M0BMU
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