I am sure Don may be able to answer when the KSB2 came out with a wider
crystal filter response, but the early on versions of the KSB2 came
standard with a 2.1kHz filter. Today it is 2.4kHz. If you look at your
KSB2 module and take a look at the lettered capacitors around the
crystals and you have caps installed in the B and N positions, then it
has a 2.1kHz filter (I think all of those caps were mostly blue in color
as well).
Elecraft sells a capacitor kit to convert the KSB2 to a 2.4kHz or 2.6kHz
filter by changing those lettered caps with different values to increase
the width. It is called the SSBCAPKT and found on the site here:
https://elecraft.com/products/ssbcapkt_ksb2-wider-bandwidth-capacitor-kit.
As I mentioned, 2.4kHz has been the standard width sold with the KSB2
for a number of years now.
Another thing to keep in mind is that there was also a crystal type
change applied as well to provide a flatter response and improve audio
quality. Again, looking at your KSB2 module, if the crystals have a "-S'
suffix on them, then you already have the newer crystals. If not, you
can upgrade them (and you may want to upgrade your CW crystals at the
same time if they do not have the "-S" suffix). There is a crystal kit
called K2KSB2XTLS that contains 14 crystals to replace both the KSB2 and
K2 CW crystals.
It is preferred to replace the caps and crystals at the same time as it
is easier to replace those tiny caps while the old crystals are removed
from the KSB2 board. Replace the caps first for your desired width and
then the crystals. It does make quite a bit of difference in audio
response.
73,
Dave, W8FGU
On 12/21/2021 9:11:33 AM, "Edward Tanton" <[email protected]> wrote:
I too would be interested in hearing the answer for this. I am NOT a big SSB
person, but would always prefer fidelity on the 1% of such QSOs. Sent from my
T-Mobile 4G LTE Device
-------- Original message --------From: Terry Bassett <[email protected]>
Date: 12/21/21 9:01 AM (GMT-05:00) To: [email protected] Subject: [Elecraft]
K2/100 audio I assembled my k2/100 quite some time ago. I finally used it on ssb. I
wastold my audio was too tight. I think the early ones were setup for contestaudio.
Mine was about serial number 3400 or so.My question is this: what can I do to change
it to more of a ragchew styleof audio?TIAW9TRB
Terry______________________________________________________________Elecraft mailing
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