I made something similar: I wanted to breakout the mic PTT line from my
IC9700 to control a sequencer (which was already wired to control
preamps, TR relays and amplifier PTT's).
I found 8-pin connectors on Amazon that would mate to the IC9700 mic
jack, used RG-174 for shielded cable for the mic audio jumper inside a
small aluminum box and used cat-5e for mic cable jumper from radio to
switch box and added a clamp-on ferrite bead at the radio end (for ac
hum/noise rejection).
I used 4-pin mic connectors to route the PTT to/from the sequencer (and
using more cat-5e for that jumper). I added a toggle switch to defeat
radio PTT if I was running my K3 with the sequencer to avoid accidental
keying of the IC9700 by the sequencer.
http://www.kl7uw.com/IC9700_Hints&Measurements.htm
For interfacing KX3 mic/signal link, you will need a four conductor mini
phone jack to mate into the radio. They can be found with a little
searching.
I made a computer interface for my KX3 using a West Mountain Rigblaster
Nohmic:
http://www.kl7uw.com/KX3_Computer_Interface.htm
These are NOT hard to do projects. No surface-mount soldering of
computer components, involved,
73, Ed - KL7UW
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