OK lets get back to the to the original question of programming a trunk system on a APX 7000. (or a Kenwood, Harris, etc.) You must have a system key and a legitimate radio ID to make any APX \ XTL radio work on a P25 Trunk system. With out the system key you will not be able to program any talk group, and with out the ID if you get the radio on the system it will eventually see the bad ID and send a Kill signal to your radio. At that point you will have to go to the system owner and have them reprogram your radio to make it work again. I have been doing this since before trunking. This is the only way to get it to work correctly on any professional radio, regardless of manufacture.