INTERLOCK
The Interlock device ensures the compliance with Radio Contest rules for the participation in Multi-Operator categories:
– Multi/Single: Only one transmitted signal on one band permitted.
– Multi/2: Maximum of two transmitted signals on two different bands may be used at any time.
– InBand: Only one signal allowed between a Radio and its associated InBand.
http://ea4tx.com/ea4tx-interlock/