I use a bearcat 8500XLT for a long time,pretty easly to use,well ! I'm moving up to a ar3000 it's all new to me,with all the different modes,here is what I like to do,frist get a understand of all the mode and how and when to use them,I would like to use it for trunking mode,I know not set up for it,but was told that it could be done,also like to monitor the Mac Dill air force base,when line to find the frequency and didn't have a clue on what they had listed for the frequency,they had letter and numbers in the frequency slot.is there a book that can explain programming the different types frequency?