Rev C KPA3 ??

[W6ODJ]

Dear Wayne and Eric,

The alert "K3/100 Rev C KPA3 Spurious TX"  has alerted me to the fact that there IS a Revision C of the KPA3.  Apparently, it began shipping sometime in the spring of 2009.  Maybe one of you could tell us in some detail about the differences between Rev C and Rev B.  In particular:

(1)  Do the two revisions use the same transistors?

(2)  Are the IMD numbers different?

(3)  How and why is the circuit diagram different?

(4)  Would it benefit a customer with Rev B or earlier if he upgraded to the Rev C?

Thank you for the fine product.

73,

Oliver Johns
W6ODJ



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[Eric Swartz - WA6HHQ]

This was primarily a manufacturing driven evolutionary revision to make
the KPA3 easier to build here, improve yields and to reduce mfg assembly
cost.

1. Same transistors
2. Same IMD

3. I'll check to see what changed on the schematic.

4. If your Rev B and earlier PA is happy, there is no urgent need to
change it.

73, Eric   WA6HHQ



O. Johns wrote:

> Dear Wayne and Eric,
>
> The alert "K3/100 Rev C KPA3 Spurious TX"  has alerted me to the fact that there IS a Revision C of the KPA3.  Apparently, it began shipping sometime in the spring of 2009.  Maybe one of you could tell us in some detail about the differences between Rev C and Rev B.  In particular:
>
> (1)  Do the two revisions use the same transistors?
>
> (2)  Are the IMD numbers different?
>
> (3)  How and why is the circuit diagram different?
>
> (4)  Would it benefit a customer with Rev B or earlier if he upgraded to the Rev C?
>
> Thank you for the fine product.
>
> 73,
>
> Oliver Johns
> W6ODJ
>
>  

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[Kevin Rowett]

I just saw an email from elecraft noting their panadaptor for the K3
will be called the P3 and available in the spring.

No information on the web page yet.

Anyone gotten a chance to play with one yet?

K6TD -KR-

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[KK7P]

Hello Eric!

> 3. I'll check to see what changed on the schematic.

The diode mod to ensure the K3 reliably turns off was incorporated into
the design, saving assembly time. I found a couple of minor component
value tweaks, likely related to the slightly altered PCB layout.
Otherwise identical.

73,

Lyle KK7P

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