[Elecraft] Using K3's Pre-amp

[Bill Johnson]

Adam,

Interesting information, thank you for sharing.  That's exactly the way to
do it.  I know I am getting heavy power line noise and know approximately
where mine is coming from as I hear it when there is dense fog and I am out
for my daily run.  I will be zeroing back in on these poor insulators come
spring and the fog returns.  I thought nothing of it before, but it has
become worse.  My neighbor across the street has a horse and an electric
fence.  He knows how much I appreciate him keeping the grass cut, but now
the moisture and snow are near the insulators is causing the electric fence
pulse which is not cured by any of the K3 settings, it also is not cured by
any other radios in the shack either.  (How old can the horse get before
passing?!%^$#@)


73,

Bill
K9YEQ
K2 #35; KX1 #35; K3 #1744; mini mods


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Adam Koczarski
Sent: Monday, January 12, 2009 9:47 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Using K3's Pre-amp


> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net [mailto:elecraft-
> bounces at mailman.qth.net] On Behalf Of wayne burdick
> Sent: Friday, January 09, 2009 8:53 PM
> To: Dave Yarnes
[BJ] ........... all, because all lower signals are
> already masked by the noise.

I just ran a noise experiment at my QTH yesterday. My typical noise is s7.0
S6.5 s7.5 on 80m, 40m & 20m respectively. With every circuit in the house
off, except the one the radio is on, and with only the power supply and the
radio on that one circuit the noise is s4.0 S4.75 s5.0. I turned on circuits
one at a time and recorded to S level jump for each. The 'home entertainment
center' seems to be the biggest contributor so I'll start there. Now I just
need to figure out how the switch off the neighborhood transformers and
silence my neighbors! :) 

I have some fairly large power lines across the street. Are they usually
strong contributors to noise?

You can see the resulting data here:
http://www.ka7ark.com/20080111QTHnoise/pics.html


Adam - ka7ark