[Elecraft] K3 DSP Board Upgrade Info

[Andy Wood]

I have now completed all of the modifications to upgrade the DSP board to the
latest spec and can say that the improvement is worthwhile. For me, the
receive audio, especially on ssb, is a lot less fatiguing.

For those wishing to attempt this yourself, here is some more info:

- Resistors and chip capacitors are 0603 size
- C9 and C13 (100uf/6.3v) need to be the correct size to fit the pcb pads.
Panasonic part number EEEFKJ101UAR are suitable. I also found it easier to
remove the headphone socket from the pcb to facilitate removal / replacement
of these capacitors.

My K3 S/N 3017 already had some of the components changed on the DSP board.
The only components left for me to do were C1, C11, C9 and C13. My DSP board
(Revision B) had a "1" handwritten after the revision number.  My guess is
mine was a revision "B1"?

Andy  VK4KY 
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