blacklogo_orangetext.gif (13932 bytes)Radio bands

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Radio Band Also known as  Frequency  How do the radio waves travel Used for 
VLF  Very Low Frequency   3 - 30 Hz
Radio waves bounce between the ground and the ionosphere like in "wave guide". Global coverage.
Global communications, Navigation, Standard Frequency and time signals
LF Low Frequency Long Wave 30 - 300 kHz Wave guide and "direct" Ground wave. Global coverage. Maritime communications
Medium Frequency
Medium Wave  300 - 3000 kHz Ground wave during the day but E  layer ionospheric reflection at night. International coverage.  Medium Wave or AM broadcasting stations, Maritime, Aeronautical, communications,.
HF High Frequency Short Wave 3 - 30 MHz Reflection from the "E" and "F" layers of the ionosphere. Global coverage. International broadcasting (such as BBC World Service), radio amateurs, Maritime and aeronautical communications.
VHF Very High Frequency   30 - 300 MHz Line-of-sight communication multiple repeater stations for needed for  national coverage. Television, FM Broadcasting, Police, ambulance services
UHF Ultra High frequency   300 - 3000 MHz  Short range line-of-sight Cellular phones, Space communications, television, Navigation, radar.
FM - Frequency Modulation
AM - Amplitude Modulation

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11/02/1999 Ruth Bamford