[CQ-Contest] TX inhibit for Icom IC-7700

[Rich Assarabowski]

Does anyone have any suggestions or experience on how to modify an Icom IC-7700 to incorporate a TX INHIBIT function?    Yaesu and
Elecraft radios both have a TX INHIBIT input, Icom's do not.    One way is to simply break the keying and mike lines but that does
not fully exclude the possibility of transmitting.    This is needed in order to interlock radios for in-band use or to share an
amplifier.

All ideas and suggestions welcomed.    Has anyone used the new EA4TX interlock controller (http://ea4tx.com/ea4tx-interlock/) ?

--- Rich K1CC