[ICOM] More thinking going on.

[Gary Fiber]

 >>It sounds to me like an adapter in the making.  The current plug on the end
of the OPC-478 is a 3 terminal.  I can make an adapter for this, 3 terminal
to two terminal.  Which of the three goes where?  I would hazard a guess,
sleeve to sleeve, tip to tip, and leave the ring open.  But that is only a
guess.<<

On the OPC-478 only the Sleeve and Ring are used the Tip is open.
Ring is hot, Sleeve is ground.

So connect Ring to Tip and Sleeve to Sleeve. As CI-V uses Tip and Sleeve

Gary K8IZ