How do you go about setting up a repeater using just a mobile radio? I know one of our old UHF repeaters was just that, a mobile with some sort of antenna hooked to a battery charger. How is this done?
It should be noted that this is not the best way to build a repeater. It is really a compramize and if you have no other choices available to you. Using a mobile as a repeater transmitter has its limitations - they tend to build up heat very quickly when pressed into repeater service and you must install fans to cool them and throttle the power back on them....
How will this repeater be licensed? The frequencies used will determine what license is needed and may also require some "frequency coordination" to ensure that there is no interference with existing services on adjacent frequencies. Please consider these elements in your planning.
I presume you are either going to use it on GMRS or on amatuer radio. I have built two repeaters out of Motorola micor radios and they both worked okay. The older trunk mount radio's use crystal heaters in the channel elements and as a rule, can easily meet the freq stability requirements. It is still a lot of work to do, when you can buy desktop repeaters like the Vertex VXR7000 for about $1200. I have seen some desktop units go on ebay for less than $600. Unless you are just a glutton for punishment or an experimenter, it "aint worth the effort"!