[Elecraft] Atmospheric Noise

[Edwin Johnson]

Hello Ron,

> ----- Original Message -----
> From: "Ron Edmon"  <mailto:ronedmon at gotsky.com> <ronedmon at gotsky.com>
> Sent: Friday, June 19, 2009 10:40 PM
> Subject: [Elecraft] DSP and IF Filters
>
> I have been going through the manual on the K3 trying different combination
> of DSP and IF as well as NR filters trying to reduce atmospheric noise.  I
> find the noise level to high pitched which fatigues me after an hour or so
> of listening.  I've listened to the "Hear It" external DSP filter employed
~
> Ron, N6SC

Yes, I'm going through the same sort of thing with my K3, which I've only had 
assembled for a week, so inexperience with this rig may be a lot of the 
problem.

If the station is strong, the high pitch is not as noticeable, but if a weak 
station or if you have to narrow the bandwidth, this is really a problem. This 
is primarily noticed at night when I may have an S6 to S9 noise level, which 
consists of what I term as 'atmospheric noise' (a rushing wind sound) and not 
static crashes or weather related sounds.

Obviously, if you have the bandwidth too narrow, you can't shift or you will 
lose the cw signal, unlike ssb usage. I'm going to follow through with a few 
of the settings given in replies to this posting and will share any I have. 
Incidentally, I've also experimented with using F2-1 NR setting (as well as 
others), which helps if the signal isn't too weak and you lose too much audio 
from the NR insertion attenuation.

...Edwin
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