[Elecraft] K2/100 audio

[Dave Van Wallaghen]

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" <n4xy at 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 <w9trbterry at gmail.com> Date: 12/21/21  9:01 AM  (GMT-05:00) To: elecraft at 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 mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:Elecraft at mailman.qth.netThis list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.htmlMessage delivered to n4xy at comcast.net
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