[Elecraft] K2/100 audio

[Don Wilhelm]

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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