Posted: 5/10/2014 8:17:53 PM EDT
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On 40 meters and it sounds like someone is sweeping the band with a vfo while ftrasnmitting
I put the pan adapter on wide and I see multiples of it but they are not parallel (like concentric portions of curves) Then they get faster and faster, the the noise floor jumps about 10 db. Meteors???? |
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This was strange because it was multiples and they were not going
at the same rate more like seeing a portion of concentric circles. What was odd was the noise floor jumped at least 10 db That leads me to thing something ionized the atmosphere I have just not sen that before, coupled with the jump in the noise level |
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Quoted:
This was strange because it was multiples and they were not going at the same rate more like seeing a portion of concentric circles. What was odd was the noise floor jumped at least 10 db That leads me to thing something ionized the atmosphere I have just not sen that before, coupled with the jump in the noise level Direct sequence spread spectrum (aka CDMA) will raise the noise floor like that (In fact, if you've got a SDR-RTL setup, look at the spectrum in the cell bands and you'll visibly see the rise in noise floor on the CDMA channels. If not radar, someone was sounding before turning on a spread spectrum transmitter. Perhaps military NVIS? |