There are a number of similar transmissions that sweep about20 or 40kHz
but spread because of the short rise time of the modulation. These are
over the horizon radar systems that on analysis appear to be very
similar to those from 20 years ago.
73
Peter
G3SMT
On 12/10/2014 18:03, Vic Rosenthal K2VCO wrote:
Since getting on the air from Israel I notice an interesting noise on
the bands 7 and 10 mHz and to a lesser extent on 14 mHz. It is a
wideband 'schmutz' (technical term) which can take from 10 to 50 or
100 kHz. Its amplitude drops of gradually as you move away from the
center. It reaches S9 levels sometimes on 7 mHz.
It does not look like the typical switching supply noise. I do not
hear it on 3.5 or 1.8 mHz.
The K3's DSP noise blanker seems to help a little, but not much.
Does anyone know what it is? Could it be some kind of spread spectrum
transmission? It could be coming from anywhere in Europe or the Mideast.
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