Manual Interlock-IP – User guide
Page 9
Section 3
Operation
The interlock detects and decides in tenths of a microsecond if a radio has activated
the PTT and decides whether it needs to take action on this or any other active radio.
In order to do this it uses an algorithm which prioritizes jobs with respect to others.
So for example it will prioritize when comparing a radio and its Inband partner, since
under no circumstance can both of these radios put a signal on the air at the same
time.
The order in which the jobs are queued is as follows:
1. Radio 4 is analyzed for being Inband or not. If it has the PTT active, and if its
partnered radio (for example R1) is also active.
2. If this is the case, it decides which one should be blocked.
3. The same process is carried out with radio 5: if it’s an Inband radio, if the
PTT is active, and if its partner radio (eg R2) is also active.
4. If this is the case, it decides which one should be blocked.
5. It will now analyze all the rest of the radio that might be active, since in the
previous cases with the Inbands, some of them might be already be blocked.
6. In case it has to block any radio, it will first analyze the priorities of the active
radios and block the one with lower priority.
7. Finally, in the case that the remaining radios have equal priority, the one the
started transmitting first will continue to transmit.
The interlock provides two Operation modes, and this is what determines how many
radios on different bands can be active at the same time:
•M/S: One signal allowed at a time
•M/2: Two signals allowed at a time
IMPORTANT NOTE:
The LCD display only refreshes every 0.5 seconds, therefore it’s possible that a PTT
change may not be showed on the screen although the microprocessor has
monitored it perfectly.
