In this case, there would be a single channel available to be shared by all users. Trunk radio Trunk radio is a sophisticated digital radio technology that makes possible a host of features normally associated with telephones. The user can be notified of an incoming call with a ring, just like a mobile phone. This means that the user does not need to keep listening to the transmissions in order to pick up when someone wants to speak to him. Companies and individuals subscribe to gain network access.
Users have to be in the network coverage area in order to use the network.
Trunk radio depends on network availability. Your potential network provider should be able to give you all the information you need. Next up, you can move out of your local area and have two-way communications directly between towns and countries. Standard HF equipment with standard power output and standard antennae can transmit and receive up to 1,000km, but with higher power and better, fancier antennae the range can be stretched to 3,000km or even 4,000km. Says James Turner of Australian radio supplier Codan Pty Ltd, 'The summer before last I sailed a yacht from UK to Spitzbergen.