I assume the microphone connector can be configured to suit different
microphones, just like the K2...
The K3 has fixed wiring rather than a jumper block. It matches the
wiring of the MH2, Elecraft's electrically and aesthetically compatible
microphone.
The pinout of the K3 microphone is consistent with the K2 if the jumpers
in the K2 are in a row. It is generally consistent with many Kenwood
microphones.
A detailed drawing of the K3 mic connector and its pinout are in the FAQ
< URL:http://www.elecraft.com/K3/K3FAQ.htm >, locate the _Interfacing_
heading near the top of the page and click on _Mic Diagram (front)_ for
details.
BACKGROUND
When the K2 was introduced 8 years ago, Elecraft did not offer a
microphone. The radio's early adopters were primarily CW operators,
most of whom seem to own a variety of designer paddles, but don't like
to admit owning microphones -- having only one is deemed sufficient, and
that one might have an uncertain pedigree :-)
Making the K2 microphone-agnostic was an appropriate design choice, and
for a radio that must be hand-built as a kit, it is a reasonable thing
to allow the builder to configure.
Unfortunately, if the K2 and its mic get separated, you can never really
be sure if you should connect a microphone configured to be compatible
with wiring for Icom, Yaesu, Kenwood or some other wiring scheme. My K2
is wired differently than the K2's of some of my friends, so they can't
use my mic on their radios, nor can I use their mics on my K2.
With the MH2, Elecraft has an electrically and aesthetically compatible
product offering. Jumper configuration seems less compelling than it
did. If you have both a K2 and a K3, the K2 is easily wired to match the K3!
I seem to offer long answers to short questions...
73,
Lyle KK7P
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