I suspect that Sparky is not familiar with trunking, and/or is not using a trunking scanner. Let's start with understanding what trunking is - read the 'tutorial article' (just click in the phrase found in the article below) of:
Trunked Radio Systems - The RadioReference Wiki
(Anything in blue and/or underlined is a link)
The tutorial is an excellent beginner's description of trunking by our own UPMan The article is in PDF format 73 Mike
__________________
links editor,
Utility Monitoring Central
Wiki Administrator, HF Forum moderator, RadioReference
Friends don't let friends buy Scancat Lite Plus!