[Elecraft] DSP and IF Filters

[Guy Olinger, K2AV]

A precise definition of what you mean by "atmospheric noise"?  And were you 
talking about effectively "rolling off" higher frequencies or were you 
talking about cancellation?

One definition of "atmospheric noise includes both close and distant 
lightning static or QRN, including from another continent.

In all my years I have never seen a verified reduction of signal-to-noise 
from QRN that didn't amount to reducing bandwidth, which still works no 
better now than it did in 1955.

Careful work with levels and SNR always exposes the truth from "sounds 
better".  Sounding more "pleasant" does not mean you will communicate better 
in a contest. You'll just feel better doing the same thing.

Not that I haven't been listening and hoping all that time.  PLEASE, PLEASE 
don't prove me wrong!

73, Guy.

----- Original Message ----- 
From: "Ron Edmon" <ronedmon at gotsky.com>
To: <elecraft at mailman.qth.net>
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
> on a friends ten-tec rig and the reduction of atmospheric noise is
> significant (1 "S" unit or better).  Shouldn't the K3 DSP filter be 
> capable
> of reducing the atmospheric noise to acceptable levels?
>
> Ron, N6SC
>
>
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