Radio Transmitters



The frequency spectrum is divided into segments for specific use. These frequency allocations are determined by international organisations (eg World Administrative Radio Conference), and may vary slightly between large geographical regions.

For example, in the UK the FM broadcast band is in the range 88-108MHz, while in parts of Eastern Europe it extends down to 76MHz. In urban environments, the electric field strength due to radio transmissions may be around 200mV/m.

A few selected examples from the frequency spectrum are :

148.5-283.5KHzAM Radio Broadcasting (LF)
526.5-1606.5KHzAM Radio Broadcasting (MF)
3.5-4.0MHzAmateur Radio (80m HF)
5.950-6.2MHzAM Radio International Broadcasting (49 m HF)
13.553-13.567MHzIndustrial, Scientific, Medical (ISM)
26.957-27.283MHzISM
27.6-28MHzCitizen's Band Radio
87.5-108MHzFM Radio Broadcasting
144-145MHzAmateur Radio (2m)
420-450MHzAmateur Radio (70 cm)
470-852MHzTV Broadcasting (UHF)
886-906MHzISM
934-935MHzCitizens Band Radio
2.4-2.5 GHzISM (Microwave Heating)
10.7-12.8GHzSatellite TV (SHF)