I had read the above threads in regards to UHF/CB Radios Use and Functions. Allthough they provided a wealth of information i still have a few questions. I had recently purchased a GME TX4400 UHF/CB Radio with a MobileOne 477mhz Ground Independant 6.5db Antenna and installed them on my car last night. I had picked up some truckies and some idiots so i take it that its working fine. I'd like to use this page as a reference for other members who just purchased a UHF/CB Radio and want to totally understand there functions, and even though i had read my insturction manual i have further questions. On my UHF/CB Radio i have a few functios and id like to understand how to use these funtions. I will quote out of my instruction manual for people to read and ill ask my question below each funtion descripton. 1. DUP/ALPHA: "Duplex Operation allows the TX4400 to transmit on a different frequency to that which it recieves. This allows operation through any repeater stations in your area.Repeaters automatically re-transmit your signal over a wider area, providing greatly increased range. The Duplex Channel only operates on channels 1-8. When Duplex is selected on one of these channels the TX4400 recieves on that channel but actually transmits on 30 channels higher.The TX4400 allows you to select Duplex Operation on individual channels. This is particularly useful in country areas where there may only be one or two repeaters. The un-used repeater channel can then be used for normal simplex or direct radio-radio communications" * If having the Duplex Function on, it provides a greater area of coverage, why not always transmit with this funtion on? * Can you just sit and listen to a Duplex Channel? * In what situations would you use the Duplex Function for? 2. A couple of times throughout the instruction manual the word "Simplex" is said. * Is this just the normal everyday mode of your UHF/CB Radio? 3. I have an OS/GS Pager button on the front of my UHF/CB Radio. * I ended up wiring my UHF/CB Radio to my lighter, this means that it comes on when the cars accessories are on compared to wiring before the ignition or straight to the battery which means the CB/UHF Radio can operate when acessories is off. I understand the Pager function, and i understand for the Pager function to work i will have to have my Acessories on when the car is un-attended. I wont be using this function, but i dont know what the OS/GS part means? 4. Most UHF/CB Radios come with Channels allready programmed. * I can select a Priority Channel, what should a Priority Channel be for? * What are the main channels used? 5. Your UHF/CB Radio * What settings do you have your UHF/CB Radio on for every day use??? * Any special channels you can reccomend for other UHF/CB Radio newbies such as myself?