[Elecraft] KI6WX Mods to KSB2

[John, KI6WX]

Jim;
The PSK31 mod has been standard production in the KSB2 for a number of
years.  It was the first mod I developed for the K2.

The  2nd Xtal Filter Flatness Mod is standard in all K2's after S/N 3000.

The 2.5 kHz Xtal filter mod will not be adopted by Elecraft for two reasons.
One is that not all BFO's can reach the required upper frequency.  The
second is that some Xtal sets will have excessive passband ripple when this
mod is done.  A few people have encountered the excessive ripple and I have
recommended that they order another set of Xtals since it doesn't occur too
frequently.

The Increased Gain and Reduced IMD Mods seem to work okay, but the Increased
Gain Mod would require re-laying out the KSB2 board.  I haven't heard of any
plans for Elecraft to do this.
-John
 KI6WX

----- Original Message ----- 
From: "Jim Brown" <jimbrown.enteract@rcn.com>


> The mods suggested to increase overall gain and reduce IM described in
> the following link look good. Have they been incorporated in post 3000
> s/n K2's? If not, I assume there is a reason why not. Anyone know?
>
> http://home.pacbell.net/johngreb/modifications_to_the_ksb2.pdf
>