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.
Frequency Allocation from ITU (International Telecommunication Union) for Amateur Radio
HF VHF / UHF SHF / EHF
1800-2000 KHz/ 50 - 54 MHz/ 3.300-3.500 GHz
3500-4000 KHz/ 144 - 148 MHz/ 5.650-5.925 GHz
7000-7300 KHz/ 220 - 225 MHz/ 10.00-10.50 GHz
10100-10150 KHz/ 420 - 450 MHz/ 24.00-24.25 GHz
14000-14350 KHz/ 902 - 928 MHz/ 47.00-47.20 GHz
18068-18168 KHz/ 1240 - 1300 MHz/ 75.50-76.00 GHz
21000-21450 KHz/ 2300 - 2450 MHz/ 76.00-81.00 GHz
24890-24990 KHz/ 119.98-120.02 GHz
28000-29700 KHz/ 142.00-144.00 GHz
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