[Elecraft] Rev C KPA3 ??

[Eric Swartz - WA6HHQ, Elecraft]

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
>
>