[chirp_users] Programming Cable Guide

[Robert Terzi]

A few comments:

The Wouxun KG-UV1,2,3D, use the same cable as the Kenwood TH-F6a,
it's the combo of a 3.5mm (1/8") and 2.5mm (3/32") plug.

It would be good to list voltages when they are known.
Some are real TTL (5V) others are 3.3V.

The Yaesu VX-8(D)R/E use 3.3V.

I would separate the listing for the VX-8G from the regular VX-8s
given that the G is totally different: both in connector and is RS-232 levels.

I'm pretty sure I've seen some good intros to RS-232, voltage levels,
etc. that would be good to link to.  I don't remember whether it was
on the OpenWRT or, Dangerous Prototypes wiki, or some other micro-controller
wiki.