[Elecraft] KDSP2 Build

[Don Brown]

Hi

The parts to do John's mod do not come with the KSB2. You will need to
change 10 to 12 caps to different values. I ordered the caps from Mouser but
Elecraft may have them. It would be easier to install the caps when building
the KSB2 as some of them are hard to get to on a completed board. If you are
doing a retrofit then I would highly recommend a Hakko solder removal unit.
John lists the values for a 2.5 KHz, 2.2 KHz and 1.9 KHz all with better
ripple specs. I have done the 2.5 KHz 3 or 4 times and the 1.9 KHz once. The
K2/100 I built for Eric had the 2.5 KHz filter in it. The 1.9 KHz filter
only requires 4 caps to be changed and has better ripple than the stock 2.0
KHz filter. The values needed for the 2.5 KHz filter are two each 39pf 27pf
150pf and four 33pf all 5% monolithic ceramic .1 inch lead spacing. You will
also remove two 10 pf caps. Remember this may not work with the older
crystal sets so you may need to install a new set of matched crystals. If
you are replacing the crystals the cap swap is easier to do while the
crystals are removed. Anyway SN 1808 and SN 2174 have the 2.5 KHz filter mod
and KDSP2's. SN 3171 will be built with the 2.5 KHz when I get time to
finish it. I am happy with how they sound.

BTW K2/100 SN 2174 with the KAF2 will be for sale after field day. It has
all the A to B mods and is fully loaded. Email me if you are interested. It
will be one of 4 K2/100's we will be using at field day on solar power
(K5TYR)

Don Brown
KD5NDB


----- Original Message -----
From: "Tom, W6WW" <tom@cwx.com>
To: "Don Brown" <DolfinDon@msn.com>; <Elecraft@mailman.qth.net>
Sent: Sunday, May 25, 2003 8:13 AM
Subject: Re: [Elecraft] KDSP2 Build


> I just received my KSB2.  Would it have any of these mods already
included?
> Would it be wise to incorporate these mods as I build the KSB2 or finish
the
> unit and then make the mods?
>
> 73,
> Tom, W6WW
> K2 #3453
>