[Elecraft] Noise in the Mideast

[Vic Rosenthal K2VCO]

Thanks to all who responded. The Chinese radar seems to fit what I hear 
best. I'll try to null it with my Pixel Loop (which, by the way, is a 
great, quiet receive-only antenna:
<http://pixel-antennas.com/?page_id=31>)

On 12 Oct 2014 21:23, Merv Schweigert wrote:
> There is Chinese Hainan Island radar that is very active, and usually on
> 7MHZ.
> it covers 100KHZ at least,   the "smaller" 10khz wide signals are also
> radar,  over the
> horizon,  the smaller ones usually are several seconds of signal then
> space and
> repeat..    the Hainan dragon is constant on all the time when operating.
> it is over S9 here on 40 when its on...
> Not sure if thats what your hearing or not,  K3 blanker will not handle
> it,  helps a
> little but not much,   I asked Elecraft about it and they mentioned an
> experimental
> change of some components that may help,  but I do not have the info and
> have
> not tried it.
> 73 Merv K9FD/KH6
>
>> 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.


-- 
73,
Vic, K2VCO/4X6GP
Rehovot, Israel
http://www.qsl.net/k2vco/