Also known as: conventional radio
Conventional radio assigns each user group its own fixed frequency, in contrast to trunked radio.1 A conversation always happens on the same channel, so there is no control channel to coordinate assignments.
How it works
Groups simply transmit on their assigned simplex frequency or repeater pair. This is simple and robust but uses spectrum inefficiently, since each channel sits idle when its group is quiet.
Relevance to SDR
Conventional channels are scanned directly by tuning to the known frequency — no grant-following required. DMR Tier II is a digital example.
Sources
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Two-way radio — Wikipedia, on fixed-frequency conventional two-way radio operation. ↩