A simulcast system uses several transmitters on the same frequency at the same instant to blanket a wide area — which only works if their timing is near-perfect. And on the way back, voting picks the best copy of the radio's signal from every receiver that heard it. Two sides of one coin: talk-out and talk-in.
Built on public P25/simulcast concepts (GPS time sync, launch-time alignment, comparator voting on signal quality). Simplified to teach the principle; real timing budgets, modulation (LSM), and equipment specifics live in licensed docs. Not Motorola software.
Multiple transmitters, same signal, same time. Tune the sync and watch the overlap zone.
One radio, many receivers. The comparator votes the best copy, packet by packet.