[Elecraft] K2/100 audio

[Terry Bassett]

Thanks, I'll check them out.

On Tue, Dec 21, 2021, 1:19 PM Don Wilhelm <don at w3fpr.com> wrote:

> 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" <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
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