[Elecraft] K2ATOBKT

[Phil Wheeler]

Charles Greene wrote:

> Hi,
>
> In the K2ATOBKT, on the top of page 8 of the Docs, it references=20
> installing the XFILMDKT. Is this essentially the same as N0SS' "K2 2nd =

> Stage SFIL Mod for 'Flatter' SSB Filter Reesponse" listed in the tech=20
> notes section?=20


I think so. The varying terminology has puzzled me, too. If you go to=20
the Order page and click on the app note for that mod, you will find:

> Eliminating the Frequency Roll-Off On One End of the K2 SSB Filter
> ver. 2 22 March 2001
> Applicability: K2s which include the SSB Option board.
> Background:
> K2 owners have commented upon the level of frequency roll-off=20
> attributed to the K2 SSB Option filter at one end or the
> other of the audio spectrum (depending upon which band and mode you=20
> are using at the time). The stock K2 SSB Option
> filter is fairly =18flat=19 across its full bandwidth. However, the 2nd=
=20
> Xtal filter (2nd Xfil) in the IF tends to cause a moderate amount
> of signal roll-off on one end of the SSB filter chain when it is in=20
> use. This translates to high-pitched receive audio when
> using USB on the bands 160M thru 17M, and when using LSB on 15M and abo=
ve.


etc. I think this is the same mod (which I did a couple of years ago).=20
I'm in the process of sorting out which I have done and which are undone =

(and which of those I want to bother with).

73, Phil