[Elecraft] KSB2 Mod's

[Don Wilhelm]

Sid,

I would personally recommend the 2.2 kHz bandwidth over the 2.5.  I know
several folks do like the 2.5 kHz, but I recommend that only for those whose
operations are mostly ragchewing and desire the best voice 'fidelity'.  The
2.2 kHz gives a better edge in crowded band conditions and a little bit more
'punch' on transmit.  Both filters are good.  One caution about the 2.5 kHz
filter - it may require a bit greater BFO range and while most K2s are OK, a
few may require a bit of 'trimming' to get the BFOs in proper alignment.
John KI6WX had a posting on the reflector about this a few days ago.

Yes, the capacitor values shown in the KI6WX instructions will be used
instead of the ones specified in the KSB2 manual.  Install them before
installing the crystals to make things easier to assemble.

The improved 2nd crystal flatness mod is included on the post 3000 SN k2s -
do nothing extra here.

The KI6WX 'KSB2 Increased Gain Mod' is a good one, but unless you have great
confidence in your building and potential troubleshooting skills, I
recommend that you build the KSB2 as instructed and then add this mod after
things are working for you.  Yes, you will have to procure the 3 parts -
Mouser www.mouser.com is a good source for small orders.

73,
Don W3FPR

----- Original Message -----
>
> NB completed & ok.   Now I am doing the KSB with modification
> questions.  Scott, Elecraft, sent me an addendum sheet (KI6WX, dt 7/18/02)
> & capacitors for the bandwidth.  I will use the Heil Traveler boom mike
for
> the K2.
>
> Not knowing about the past problems, here are my questions:
>
> A. "Crystal Filter Bandwidth Mod":  I have the mod cap's from Elecraft.
>  From what I can gather, it might be best for me to install the lettered
> cap's             for a bandwith of 2.5khz.  Is this correct.????
>
> B. "Improved 2nd. Xtal Filter Flatness Mod";  This mod was as built, I
> assume on all > #3000.  No question.  Done.
>
> C. "KSB2 Increased Gain Mod":  Do I install now?  I will have to purchase
> some parts to install, Pn2222, 82.0 & 2.7k resistors.
>       I assume I should obtain parts & install now??
>