[Elecraft] K2 SSB

[Don Wilhelm]

Rich,

There is no direct relationship between the crystals and the caps for the
2.4 and 2.6 kHz bandwidth filters.

Sorry to hear about the attenuation - check the soldering and re-check the
soldering of T1, T2, RFC1 and RFC2.

73,
Don W3FPR

> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net]On Behalf Of Rich McCabe
> Sent: Thursday, March 09, 2006 10:11 PM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K2 SSB
>
>
> Well I dont know :)
>
> The manual they sent says revision D and January 2004.
>
> This manual shows installing CB and CN and the last one on their
> site says
> leave it out. It also calls CG/CH a 47 pf capacitor. According to the new
> update sheet, only the original 2.1 SSB used a 47 pf cap in CG/CH.
>
> So I am confused. This would mean I have -s crystals and old caps !
>
> I installed the parts and I obviouslly have something wrong. The
> OP1 filter
> is severally attenuationed. It works, but is several DB down from what it
> should me.
>
> Thanks for the response guys. Back to checking things over.
>
> 73,
>
> Rich
>
> ----- Original Message -----
> From: "Don Wilhelm" <w3fpr at earthlink.net>
> To: "Rich McCabe" <r.mccabe at 1967z28.com>; <elecraft at mailman.qth.net>
> Sent: Thursday, March 09, 2006 6:52 PM
> Subject: RE: [Elecraft] K2 SSB
>
>
> > Rich,
> >
> > All I can say is that if you have CB and CN populated, either
> you have the
> > 2.1 kHz filter or that you made some mistake in pluging the capacitors
> > (the
> > latter not likely since you indicate the capacitors called for in your
> > manual).  I can confirm that the 49136-S crystals are the new type.
> >
> > In any case, all you need to do is change the capacitors to
> those required
> > for the new bandwidth and you should be 'good to go'.  I have
> not compared
> > the manuals in detail, but as far as I have observed in several KSB2
> > builds,
> > the only recent change to the KSB2 manual has been the filter
> width change
> > information and the prior errata information has been incorporated into
> > the
> > new manual.  Other than the firmware changes to support the
> K60XV option
> > and
> > the addition of the bandwidth information, the KSB2 has been
> quite stable
> > for some time.  Whe you finish, you should have no caps in the CB and CN
> > positions.
> >
> > 73,
> > Don W3FPR
> >
> >> -----Original Message-----
> >>
> >> On a whim, I decided to order the SSB upgrade capacitor kit for
> >> my K2 Serial
> >> #4331 as I never have been happy with the SSB audio.
> >>
> >> While trying to decipher the tech sheet (installation
> >> instructions) I notice
> >> that it shows no caps in place for CB and CN. It was my
> >> understanding that
> >> Serial 4331 should have a 2.4 filter setup. My crystals are
> >> marked with the
> >> "4.9136-S", so I am assuming its a late kit.
> >>
> >> I just pulled out MY manual and it shows installing CB and CN and
> >> does not
> >> look like the manual on the Elecraft site that says to leave
> them out. I
> >> have no erata sheet with my K2 stuff.
> >>
> >> So I am wondering if Elecraft just shipped me an old manual??
> >>
> >> Anything else I should look for that has changed between manual
> >> revisions?
> >>
> >> 73,
> >>
> >> Rich
> >> kd0zv
> >>
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