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What is a ham callsign?
As soon as the amateur radio operator makes his wireless transmitter on, picks up the press-to-talk (PTT) microphone or starts pounding the Morse Key, he sets in motion a sort of chain of communication involving a number of amateur radio stations. Each station has its own unique "name" alloted by the authorities. Just as the telephone number helps you to know its owner, in amateur radio, the unique name assigned to a ham radio station helps you to know its operator. This unique name is called the "Call sign".All hams get a call sign, a set of letters and numbers, assigned to them by the authority. For example VU2MSY is an Indian call sign which belongs to  me, while 4S7VK is a Sri Lankan call sign which belongs to Victor. In a call sign, the letters before the number is called the prefix. Each country has its own prefix. The International Callbook lists call signs of all the licensed ham radio operators of the world along with their addresses.

Click here to visit the site where you will find the names and addresses of all the hams of the world! QSL information