[Elecraft] K2 version A and B

barry halterman kthreebo at gmail.com
Thu Jun 25 16:35:44 EDT 2020


Thanks for the reply Don. I tried to down load the instruction manual but
get an error "page not found", so wasn't sure what mods were incorporated.

Barry

On Thu, Jun 25, 2020, 3:25 PM Don Wilhelm <donwilh at embarqmail.com> wrote:

> Barry,
>
> All K2s above SN 3000 are revision B - and that is what is being shipped
> today.
>
> The original Field Test and Rev A K2s began to have many mods added to
> them, so finally the boards were laid out again to incorporate all those
> mods onto the new boards - the result was Rev B.  I believe that
> happened in 2003.
>
> A fully upgraded early K2 will perform just like a brand new one.  One
> witness to that fact is my SN 00020 which was a Field Test model.
>
> There are a substantial number of mod kits for the K2, and they are
> listed on the K2 A to B upgrade instruction sheets.
> The one thing that is not covered in those instructions is the
> installation of the upgraded IF crystals (changed at SN 2560) and the
> KSB2 mods such as the PSK mod and the widening of the KSB2 filter to
> 2.4kHz instead of the original 2.1kHz.
>
> Also not covered is upgrading the KPA100 - the KPA100UPKT will bring any
> KPA100 up to the latest level.  The KPA100 does not carry a serial
> number, so the latest level must be determined by inspection.  If
> toroids L16 and at RFC4 have blue cores, it is the latest.  The older
> ones have red cores at L15 and L16.  There have also been upgrades in
> the KPA100 shield.  The latest has a 1/4 inch wide slot above the SO239
> jack and has spring clips that ground the shield to the sides of the
> base K2.  For other than the Field Test KPA100s, the board has not been
> changed.
>
> 73,
> Don W3FPR
>
> On 6/25/2020 2:51 PM, barry halterman wrote:
> > Could someone tell me main differences between the version A and B for
> the
> > K2?
> > Is the version B being shipped now if ordered?
>


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