Manual Interlock-IP – User guide
Page 18
Annex VI – Connections for other radios
In radios that do not have an Inhibit input, what we do is route the Mic signal (in SSB)
or the CW signal (CW Mode) through pins 3 and 8 on the DB9 connector.
As already indicated in the Hardware section (Page 6) the interlock has one relay per
radio present between pins 3 and 8 on each connector. When idle the pins are
connected but when the block is activated for that radio, the contact between the two
pins is opened.
By routing the microphone or the Morse key signals through pins 3 and 8, when idle
the radio works normally but when the interlock activates the relay, the radio cannot
transmit since the input signal is cut off.
