[Elecraft] eHam.net forum message

[Vic K2VCO]

I wonder if he is talking about QRN from storms, etc. or manmade QRN?

I've heard this before. The K3's AGC pulse rejection feature is intended to improve 
performance in this area.

Has anyone tried to quantify or describe this better? It would need to be done with an a/b 
comparison. It's not so easy to describe types of QRN, either. 'QRN' is meaningless, 
because of the huge differences in the nature of noise, which anyone who tries to compare 
noise blankers, for example, soon learns!

On 7/13/2010 9:37 PM, RLVZ at aol.com wrote:
>
>
> Dick Van Zandt (K9OM) has sent you a forum message for you to review.
>
>
> ----- start of message ----- "Noisy DSP experiences".
>
> Forum: Articles Subject: An Interesting CQ WPX CW Experience
>
> The"noisy DSP" phenomena is well known. Rob Sherwood has also identified this
> problem and has written about it.
>
> I have  the following radios K3 K2 Flex5000 IC7700 Perseus
>
> ALL the above radios except the K2suffer from  the noisy front end problem when mild
> QRN is around.  It sounds like these radios have a reverb unit on the receiver which
> multiplies static and pulse noise.
>
> Elecraft claims to have  a cure for this problem, however I still find the receiver
> noisy. The K2 I  prefer over the K3 on CW when there is  QRN around. The filters on the
> K2 sound better on CW when there is QRN about.
>
> It amazes  me every time that I turn on any of my old old analog radios like the TS830S
> or the FT1000D and do a comparison. The QRN all of a sudden becomes tolerable and not
> so nerve wrecking.
>
> The TS830S is still my favorite low band radio for picking  weak signals out of QRN on
> 160 and 80 meters. This is especially so when there is a lot static and QRN around.
>
> Its unfortunate that there is no current model  analog transceiver manufactured that
> has  fantastic receiver  dynamic range numbers like the Elecraft K3. The only option
> available is  to build  your own like the PA3AKE H-mode mixer high performance
> receiver.
>
> http://www.xs4all.nl/~martein/pa3ake/hmode/
-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/