[Elecraft] K2 with DSP, big NO NO!

[David Gropper]

Dear Dr. Megacycle    <G>

James - My humble opinions are in line... Just playing
"Devils' Advocate!""

> So, if the DSP has a better frequency response than the
circuits that
> preceed it, the frequency of the whole will be improved by
the addition of a
> DSP.
If the frequency response of the audio amp is ,say, 400-3000
Hz then the addition of an ADSP unit will not usually make it
Hi-Fi.

> An audio filter, either analog or DSP cleans these up very
nicely, and makes a
> dramatic difference both to the ear and the spectrum
analyzer.
Agreed...

>  Selectivity early in the receive chain is preferable
> due to potential non linearity problems. But if the early
stages have been
> taken care of, audio filters can be of great utility.
Well said !!

Addendum:
However, IMHO, the utility of putting something like the SGC
ADSP2 unit into a K2 (I don't know about a K1) is the ability
to 'notch' out the heterodynes, removes 'crashes', 'clicks',
etc.. and generally decrease the harshness on the ears.. there
is very little, if any, artifacting from that unit.

I have the (possible) advantage of being able to put my K2 and
my SGC-2020 ADSP side by side on the same (poor) antennas and
compare them under real life conditions as opposed to being in
the ARRL lab!!

With my far from ideal operating conditions there are
definitely times when I switch to the SGC-2020 although the K2
is the favorite child  :-)

The poor old ICOM 746's built in DSP cannot compete!! I use
the Am-Comm ClearSpeech with that... but the  ClearSpeech
produces to many artifacts..

"Steps down from the dais, bows, takes tomato in face !!"  <G>

Dave KK7SS
K2 #3003