[Elecraft] K2 DSP summary

Fri Dec 19 15:40:01 2003

Rich, it's actually quite simple.
XFIL varies the bandwidth of the crystal filter in the
receiver IF section.  AFIL varies the bandwidth of the
DSP unit in the audio section.  They can be used alone
or together.
In my case, I have both the XFIL and AFIL settings the same,
so if I set up .5 on XFIL, I just dial up .5 on AFIL also.
the net effect of having them at the same bandwidth is to
steepen the effective filter skirts a bit, without altering
the desired nose bandwidth of the filtering system as a
whole.
When setting up my filters with Spectrogram, I start with
the narrowest AFIL setting and set XFIL to the same setting.
Then I do the BFO adjustment until I have the desired sidetone
pitch centered in the net filter passband.  This assumes you
have decided on what pitch sidetone you want, and have already
set AFIL to be centered on that pitch.  In my case, 580 Hz.
Hope this helps a bit.
Good luck and 73
Bob N6WG

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Rich McCabe
Sent: Friday, December 19, 2003 10:25 AM
To: [email protected]
Subject: [Elecraft] K2 DSP summary

Is there a good summary somewhere of operation for the DSP on the K2.

The manual does not have much detail about the basics of using AFIL / XFIL.

At first, I thought you either used XFIL or AFIL. One or the other... but
this does not seem to be the case.

Can someone fill me in? I find the operation confusing !

73,

Rich
kd0zv

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