[Elecraft] Noise in the Mideast

[Peter Torry]

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.