Receiver and transmitter voting

Personal radios are useless. They are useless if they must stand alone in a system which is expected to cover a large area with 100% reliability. Personal radios need not stand alone, however, due to the availability of receiver voting systems. Receiver voting systems allow people equipped with personal radios to talk back to a dispatcher from long distances since they allow receivers to be located at strategic points throughout an area. Receiver voting systems come in three basic types: relay race, tone quantized, and noise floor measuring, each of which function basically by measuring signal quality.