[Elecraft] K2 crystal filter question

[Don Wilhelm]

LS,

That number is ignored in the base K2 manual, but if you add the KSB2 
board, the number that is printed on the crystal set for that option is 
important to initially set the SSB filter passband right.

If you just used the default values for your filter, they will be close, 
but you will find an improvement if you refine the filter alignment.  It 
is not difficult, and there are several methods, but bite the bullet and 
use Spectrogram.  Go to my website www.w3fpr.com and read the article on 
K2 Dial Calibration.  Part 3 of that article deals with the filter 
setup, and has links and references.  You can download version 5 of 
Spectrogram (it is freeware) from www.n0ss.net.  Note that it is no 
longer available at Visualization Sofrware's website.

73,
Don W3FPR

lstavenhagen wrote:
> Hi all,
> Just remembered something from my K2 build that I'm still wondering about
> and never asked on the reflector about. On P54, the 5th step of the build
> manual: you're instructed to read the number written on the package
> containing the 7 crystals for the crystal filter. I remember there being
> such a number on there and writing it down in this step.
>
> However, I don't ever recall being asked to use this figure in any of the
> steps having to do with the crystal filter. Or indeed use that number at
> all. Unless I goofed up and skipped it somewhere? 
>
> So my question is, what is this measurement/number ever used for? Just
> wondering as my K2 seems to work fine and the filters seem to work fine
> too...
>   
>