[Elecraft] Problems with K2

[Kevin Cozens]

At 12:49 PM 09/28/2002 -0400, no9e wrote:
>2. After doing 2nd XTAL mod, the sensitivity with FL2-4 is about 10 db 
>lower than with F1. Also, I feel that the CW sensitivity is lower. I 
>peaked L34 but the peak was not too sharp. Does the modification (inluding 
>removal of 10p), deteriorate CW sensitivity? I used BC337 instead of PN2222.

Finding the point of maximum signal with least noise is not an easy thing 
to do by ear alone. There is no sharp peak as you have found. I have a 
procedure for setting L34 using Spectogram but I haven't written it up yet. 
Its on my list of things to be done however. Hopefully soon.

>3. On CW, after changing from FL3 (.6) to FL4 (.2), the pitch changes. Is 
>this normal?

A qualified yes. It depends in part on how you set up the K2 filters. A 
change in filter bandwidth will change the apparent pitch of the background 
noise. Careful setting of the CAL values for FL1-4 can minimize the amount 
of pitch change of a received CW signal when switching between filters. You 
may not be able to get the pitch change to zero but a change of only 10 or 
20 Hz may be possible. You will need to use a program like Spectogram to 
set the filters to minimize pitch change.


Cheers!

Kevin.  (http://www.interlog.com/~kcozens/)

Owner of Elecraft K2 #2172        |"What are we going to do today, Borg?"
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