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Re: Data on the air. How's it encoded?
It can be a control channel for a trunked system, but it just doesn't seem right, the amount and quantity of information seems too low/slow.
What is a trunked system? Of course, you can google or wikipedia it. In short, when you have many radio users, but not many channels, you 'trunk' all the voice signals onto a few shared channels and tell the receiving radio where to listen. The radio tuner hops around for its signal, and you can pack a lot more signal into just a few radio channels this way. Trunked systems also allow interoperability, the ability of one group of users to speak with another group if users, but can suffer from overload when there are a large number of users needing access at the same time in an under-designed system. |
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