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K2 version A and B

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barry halterman

K2 version A and B

Could someone tell me main differences between the version A and B for the
K2?
Is the version B being shipped now if ordered?
Thanks
Barry
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Don Wilhelm

Re: K2 version A and B

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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barry halterman

Re: K2 version A and B

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 <[hidden email]> 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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Don Wilhelm

Re: K2 version A and B

Barry,

I did make one error in my post - it relates to the blue core toroid -
it is at RFC1, not RFC4 as I indicated.

With the Covid-19 problem in California, I suspect that the website may
have some uncorrected errors at this time.
I will send a copy of the K2AtoB instructions in an off-list email.

73,
Don W3FPR

On 6/25/2020 4:35 PM, barry halterman wrote:

> 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 <[hidden email]
> <mailto:[hidden email]>> 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?
>