Also known as: channel grant
A channel grant is the control-channel message that assigns a talkgroup’s call to a specific voice channel (and timeslot on TDMA systems).1
How it works
The grant names the talkgroup and the channel; affiliated radios and monitors retune to follow the call. It is the moment a monitor learns that a call is starting and exactly where.
Relevance to SDR
GopherTrunk reads grants in real time to task a receiver to the right channel/slot, which is how it follows conversations as they scatter across the channel pool.
Sources
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Trunked radio system — Wikipedia, on the grant message that assigns calls to voice channels. ↩