What is Call Sign
Call signs are the shorter forms of unique names to use in corresponding among the radio operators. Many years ago, through an international agreement, the nations of the world decided to allocate certain Call Sign prefixes to each country. International Telecommunication Union (ITU) radio regulations outlined the basic principles used in forming Amateur Call Signs. According to their regulations, an Amateur call sign must consists of more than one characters and at first there can be a numeric character as a prefix and then there be a letter and again there can be a numeric one. The call sing must not be more than three characters long. The range S2A-S3Z has been allocated for BANGLADESH . After passing the exam you can get a Call Sign from this range.
What Are the Amateur Radio Bands and Frequency
Look at the dial of an old AM radio and you'll see frequencies marked from 540 KHz to 1600 KHz. Imagine that band extended out many thousand kilohertz, and you'll have some idea of how huge additional radio spectrum is available for the Amateurs, Government and Commercial radio bands. Here you'll find all the aircrafts, shipping lines, fire service and police communications, you will also find the so-called "shortwave" stations, which are worldwide commercial and Government broadcast stations. Amateurs are allocated nine basic "bands" (i.e. groups of frequencies) in the High Frequency (HF) range between 1800Hz to 29700 KHz, and other seven bands in the Very High Frequency (VHF) bands and Ultra High Frequency (UHF) ranges, Super High Frequency (SHF) or microwave bands. Even though many Amateur Radio conversations may be heard around the world by anyone with a suitable radio receiver, given the right frequency and propagation conditions, Amateur Radio is basically a two-way communication system among radio amateurs.
What are the Radio Equipment
Around the world there are millions of HAMs using different types of radio. They always use the frequencies allocated by the International Telecommunication Union (ITU). Generally to communicate in short distance say within 10 to 50 kilometer you need to use VHF frequency. For that you need a VHF Walkie-Talkie. You can easily take it in your hand. You can get a VHF Walkie-Talkie for around 7,000 to 10,000 Taka. To communicate around the world you need to use HF band, for this you need a HF Radio. HF Radios are quite expensive starting from 25,000 to 80,000 Taka. There are several companies make these radios, like ALINCO, YAESU, KENWOOD, MOTOROLLA, and ICOM etc.
An Amateur Radio Station Setup
To setup a basing Amateur Radio Station, all you need an Amateur band Transceiver (transmitter & receiver), a power supply unit, an antenna system and a Logbook. Optional stations accessories e.g. SWR meter, Antenna tuner, Rotator, Clocks, Temperature monitors etc. can be used to enhance your operational environment. The simplest type of antenna used is a wire dipole antenna. One can use Beam antenna (Yagi & Log periodic arrays), Quad antenna, Loop antenna, and Vertical antenna to boost up the signal quality.