Edward and Terry,
The SSBCAPKT was released November 2004. KSB2 kits built before that
had a 2.1 khz filter.
Look at your KSB2 board. If CB and CN positions are populated, you
have the narrow 2.1 khz filter width.
Download the instructions for the SSBCAPKT
(https://ftp.elecraft.com/K2/Manuals%20Downloads/SSBCAPKT.pdf) and pay
close attention to the 2nd page to see if your BFO range will support
the 2.6 khz width. If not you will have to use the 2.4 kHz width.
You will want to use Spectrogram for alignment - but the link in that
document will no longer work. You can find a good download on my
website www.w3fpr.com - scroll the homepage to near the bottom to find
the links to the files resident on my website.
Position the 'knee' of the low frequency slope of the passband.
See http://www.mmccs.com/mmarc/n0ss/k2_filters_using_gram_v5r17.pdf if
you are not familiar with setup and use of Spectrogram.
73,
Don W3FPR
On 12/21/2021 9:31 AM, Dave Van Wallaghen wrote:
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" <n...@comcast.net> 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
<w9trbte...@gmail.com> Date: 12/21/21 9:01 AM (GMT-05:00) To:
elecraft@mailman.qth.net 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
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