[Elecraft] P3 Noise signature

[Ron D'Eau Claire]

That looks like Plasma TV noise to me Fred. It's very, very broad band since
it's basically just arc-generated RF noise from each pixel radiated through
the TV screen. The level and distribution across the RF spectrum varies
according to the information being displayed on the TV. 

Some have asked if it "tunes". If you have a bad I.F. cable between the K3
and P3, it may well pick up more of the noise than your antenna, so that's a
good place to start. You might knock it down a lot if that cable has a
defective ground. 

73 Ron AC7AC

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Fred Jensen
Sent: Tuesday, April 30, 2013 7:45 PM
To: Elecraft Reflector
Subject: [Elecraft] P3 Noise signature

OK, I think I posted the screen shots at

www.foothill.net/~andreaj/QRN.html

I think the capitalization may be important.  For all who replied, this is
external noise, it appears instantaneously, usually not on weekdays during
the day, sometimes on weekends earlier, and usually around
1600-1700 local.  The big peaks drift slowly, often stop and are steady. 
  There's a harmonic pattern to it, a wide fundamental, and increasingly
narrow and closer spaced "harmonics".

It's now 1945 local, and the P3 trace is below the baseline again.  The
noise may have continued to move up in frequency, or gone away.  If it one
of my neighbors' TV's, they must go to bed fairly early. :-))

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2013 Cal QSO Party 5-6 Oct 2013
- www.cqp.org

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

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html