[Elecraft] DSP and IF Filters

[Ron Edmon]

Merv,

 

Interesting, I have used the shift and on my unit the FC* is at 150.  I find
moving it down to 90 helps (toning down the higher pitches noise) as well as
playing with the bandwidth (trial and re-trial).  Noise seems to be about S3
in my area with no improvement or reduction in noise using DSP (both IF's)
or using Noise Reduction at any of the settings.  NR seems to be pretty
ineffective unless it's just operator error but, I think I have a fair
understanding of going through the settings while listening to the
atmospheric noise..

 

Thanks for your comments,

 

Ron N6SC

 

  _____  

From: Merv Schweigert [mailto:k9fd at flex.com] 
Sent: Saturday, June 20, 2009 4:11 PM
To: Guy Olinger, K2AV
Cc: Ron Edmon; elecraft at mailman.qth.net
Subject: Re: [Elecraft] DSP and IF Filters

 

Cannot say what Rons definition of the noise is,  but mine is the higher
pitched sound
of the radio without QRN and a noise level of S1 to S2 on the meter,  but I
find its 
easy to find a comfortable listening "pitch" by just using the shift  and a
couple clicks
down the passband and the high pitch is gone.  For instance the FC* on mine
says 
.60  and if I move the shift down to .50 or .40 the high pitch is gone.  
Have never found a setting on NR that has worked for me,  others have better
luck. 
73 Merv KH7C



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"  <mailto:ronedmon at gotsky.com> <ronedmon at gotsky.com>
To:  <mailto:elecraft at mailman.qth.net> <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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