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Glossary of Terms Used for USAID's Automated Directives System (ADS) - Updated 07/15/2011 Partial Revision

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Term Definition
Radio Frequency

The number of complete alternating electrical currents. The unit of frequency measurement is the hertz (hz) and is one cycle per second. Radio frequencies fall between 3 Khz and 30 Ghz and the radio spectrum is divided into eight frequency bands: Frequency Classification Designation 3 to 30 Khz Very low frequency VLF 30 to 300 Khz Low Frequency LF 300 to 3000 Khz Medium frequency MF 3 to 30 Mhz High frequency HF 30 to 300 Mhz Very high frequency VHF 300 to 3000 Mhz Ultra high frequency UHF 3 to 30 Ghz Super high frequency SHF 30 to 300 Ghz Extremely high frequency EHF (USAID Automated Directives System - ADS - Chapter 564).

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