[Elecraft] K2 / 100 - SSB Filters

[Don Wilhelm]

David,

It may help for you to re-visit the FL2 and FL3 filters with 
Spectrogram.  Instead of believing the filter widths that are indicated 
on the display, you may want to actually measure the width in the 
Spectrogram display.  When the K2 variable filter is set substantially 
away from its design point, the filter width does not track very well - 
the design point of the K2 variable filter is in the 400 to 600 Hz 
range, and a width of 2kHz is very far away indeed.  Usually the actual 
width is wider than that indicated.

If you need additional information about setting the SSB filters, take a 
look at my website www.qsl.net/w3fpr - look at part 3 of the article on 
K2 dial calibration.

73,
Don W3FPR

David Wilburn wrote:
> I participated in a couple of contests lately with my K2/100, and I was
> amazed how I could drill down and isolate CW signals with the
> combinations of xfil/afil's (KDSP2).  It was VERY rare that a
> combination of FLx/CFx didn't make the problem go away completely.  In
> those cases it diminished it enough that I could ignore it.
>
> In the SS SSB contest, working through the FLx filters did not seem to
> have much impact against strong adjacent signals. Does this mean I need
> to go back through and re-visit the filter alignment for the SSB stages?
> I imagine that in some cases, with the size of noisy amps the SSB'ers
> use, nothing with help.  Current settings are;
> FL1-OP1
> FL2-2.00
> FL3-1.80
>
> Will going through the filter alignment for SSB help with this?  Is
> there a setting in there (can't recall) that steepens the skirt?  Will
> tweaking the afil/SFx filter settings help any?
>