HFU HF Underground
Loggings => Other => Topic started by: ChrisSmolinski on August 09, 2013, 2001 UTC
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I've noticed this wide band signal, not seen before here, starting at 1958 UTC today:
(http://www.radiohobbyist.org/blog/mypics/UNID_signal-waterfall_08092013.png)
On and off, and there is some apparent fading of some of the frequencies. I do not think it is local QRM.
Here it is with a wider waterfall:
(http://www.radiohobbyist.org/blog/mypics/UNID_signal-waterfall_08092013b.png)
Ragnar came up with "picket fence" - I like that name.
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That kind of neat to see the various fading holes. Would like to see this go much wider and last for a very long period of time to see how propagation affects the signal.
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Chris, do you still have a file on this signal? If you do you might make a 20 or 30 second sound clip in USB, say 4 or 5 kHz width and around 6995 kHz c/f. I really just want to know if this is LFM or if it is pulsed, and the tone spacing.
I have seen a similar freq and width sounder in use, mostly detectable on the west coast, but it looks like the sweep rate of this signal is much higher than the sounder I have seen. If swept vs pulsed the sounder would be a possible fit. If pulsed a signal I have a couple other signals as possible fits.
But really nothing in my log is a good match, they all have to be changed or twisted to fit what seems to be shown in that waterfall.
T!