In Phase 2 systems a certain time slot is assigned to the вЂњ0вЂќ channel and the other slots are assigned to the вЂњ1вЂќ channel. The radio system divides a radio signal into timeslots of tinyВ fractions of a second. Technobabble here: Phase 2 uses Time Division Multiple Access, more commonly known as TDMA. If your system uses Phase 2 be sure to get a Phase 2 capable scanner!

вЂњPhase 2вЂќ P25 effectively splits channels using TDMA (See technobabble below) to allow 2 simultaneous conversations on the same frequency, effectively doubling the capacity of a trunked system. вЂњPhase 1вЂќ is the original single channel-per-frequency protocol used on conventional systems and most trunked P25 systems. While the P25 standards are supposed to ensure that any companies radios will work on the various systems, in practice some companies often add new вЂњfeaturesвЂќ that tend to lock out other companyвЂ™s radios from working with the system. Several manufacturers, like Motorola, Harris and others sell P25 systems and equipment. This is widely used by both trunked and conventional (non-trunked) radio systems across the country. The most common for police, fire and other public safety use is APCOвЂ™s P25 system. There are several types of digital that are of interest to scanner listeners. A digital receiver then converts it back and lets you hear it. This is a signal that is converted to the base 0вЂ™s and 1вЂ™s, compressed, and sent out on the airwaves. All digital scanners work just fine on analog channels, always have and always will.Дigital radio means that instead of using a regular AM (where the amplitude is changed) or FM (where the frequency is modulated or changed) signal, a digital signal type is used. What does this mean for the scanner listener? What is вЂњDigitalвЂќ anyway?ДЇirst, before we go any further, the number one question we get about digital scanners is whether they will also work on analog. Many areas of the country have switched to вЂњDigitalвЂќ.

Scan master aor