Re: [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:

)

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/
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com

Re: [Elecraft] Noise in the Mideast

[Merv Schweigert]

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.


__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com

Re: [Elecraft] Noise in the Mideast

[Jay K2TTT]

Might be this

https://medium.com/war-is-boring/iran-can-now-detect-u-s-stealth-jets-at-lon
g-range-765efd6253e2




73

K2TTT (Jay)C6ATT


__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com

Re: [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.


__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com