[Elecraft] [K3] K3 Utility settings for CW filters

[Arie Kleingeld PA3A]

Dick,

To come up with a optimal (?) setting I worked as follows:

Connected the elecraft XG-2 generator, 40m, S9 setting.
Set the K3 AGC to off and the display to dBV
Set Mode to cw, tuned on exact spot freq.

All frequency offsetsfor the filters were set as indicated (have 2.7,  
2.1, 400 and 200) and checked. Worked with these setting for the past 2 
years and worked just as expected.

Now for setting the filter gains:
I tried to achieve a simular dBV reading for all filters in this set-up. 
I tuned around the spot freq for max dBV readout.
The K3 came up with +5dBV with enough room above and under this level 
for the 2.7 filter.
I used that as a reference.
Then switched in the different filters and tried to compensate the loss 
in dBV.

My settings for the filters are now (for all filters around a +5dBV 
reading):
2.7k  0dB
2.1k  3dB
400   7 dB
200   8 dB  (200Hz is still 2dB short of the 2.7k level)

Ofcourse the dBV readout may differ with bandwidth (by definition) but I 
can clearly hear the difference in level. Not sure how much I need to 
compensate this measurement for bandwidth when using the XG2. at S9 level.

Has someone measured it like this?

I know that the K3 agc or my manual RF will compensate it all but I am 
trying to understand a few things and why it is a setting in the K3.

Help and guiding will be much appreciated.


73
Arie PA3A
k3 #1255


Op 4-1-2011 1:25, Dick Dievendorff schreef:
> This is in the owner's manual, and there's a corresponding table in K3
> Utility Help on the Crystal Filter configuration page.
>
> I'm afraid the table will format strangely in text e-mail.  The page is
> indexed under "filter configuration". Look for the heading "Loss
> Compensation".
>
>
> 73 de Dick, K6KR
>
>