[Elecraft] KAF2 or KDSP2 for K2 #5287

[Rob Locher W7GH]

Idiom Press make a SCAF-based audio filter called the SCAF-1.  It's a  
low-pass filter with a variable upper cutoff frequency.  It also operates  
in real-time with no ringing.  Recordings of the SCAF-1 in action are  
available on the web site:

http://www.idiompress.com/scaf-1.html

The standard disclaimer does NOT apply...

73,
- Rob
K2 #5004



On Thu, 06 Apr 2006 11:24:55 -0700, Rick Dettinger <k7mw at cmc.net> wrote:

> Keith - I do CW only and use the KAF2 and think that it is an  
> improvement.
> But not to decrease bandwith, the IF filters handle that chore very  
> well.  A
> bandpass or lowpass  AF filter cleans up internal noise that I find  
> tiring.
> Another solution maybe headphones that cut off high frequencies.  I
> currently use Sony headphones that have good high audio frequency  
> response
> so the audio filter is very helpfull.  I like the comfort of the Sonys  
> but
> would like CW phones that cut off frequencies above 600 hz. or so.  I  
> also
> have a passive outboard bandpass filter constructed from 88mh inductors.
> The signal is very clean but the response is actually too sharp for most
> use.  I would rather it were designed as a low pass filter.  This would
> clean up all electronic noise.    73 - Rick - K7MW