ITU DEFINITION Flashcards
(24 cards)
Includes ac power line frequencies as well as the low end of human
hearing range
Extremely Low Frequencies, 30 – 300 Hz
Extremely Low Frequencies, 30 – 300 Hz
Includes ac power line frequencies as well as the low end of human
hearing range
This is the normal range of the human voice. Although human hearing
extends from 20 to 20,000Hz, most intelligible sounds occur in this range.
Voice Frequencies, 300 -3000Hz
Voice Frequencies, 300 -3000Hz
This is the normal range of the human voice. Although human hearing
extends from 20 to 20,000Hz, most intelligible sounds occur in this range.
Includes the higher end of the human hearing range by up to 20 KHz.
Many musical instruments also make sounds in this range.
Very Low Frequencies, 3 -30kHz
Very Low Frequencies, 3 -30kHz
Includes the higher end of the human hearing range by up to 20 KHz.
Many musical instruments also make sounds in this range.
Frequencies in this range are used in primary communication services
such as aeronautical and marine navigation
Low Frequencies, 30- 300 kHz
Low Frequencies, 30- 300 kHz
Frequencies in this range are used in primary communication services
such as aeronautical and marine navigation
The major application of frequencies in this range is AM Radio
broadcasting (535 – 1605 kHz). Marine and aeronautical Communications
also takes place in this range.
Medium Frequencies, 300- 3000 KHz
Medium Frequencies, 300- 3000 KHz
The major application of frequencies in this range is AM Radio
broadcasting (535 – 1605 kHz). Marine and aeronautical Communications
also takes place in this range.
High Frequencies, 3- 30MHz
These are frequencies generally known as short waves. All kinds of two way radio communication take place in this range.
These are frequencies generally known as short waves. All kinds of two way radio communication take place in this range.
High Frequencies, 3- 30MHz
Very High Frequencies, 30- 300 MHz
Used by many services including mobile radio, marine and aeronautical
communications, FM radio broadcasting (88 – 108 MHz), and television
channels 2 to 13. Frequencies above 1GHz are generally known as
microwaves.
Used by many services including mobile radio, marine and aeronautical communications, FM radio broadcasting (88 – 108 MHz), and television channels 2 to 13. Frequencies above 1GHz are generally known as microwaves.
Very High Frequencies, 30- 300 MHz
Ultra High Frequencies, 300 – 3000 MHz
A widely used portion of the frequency spectrum including television
channels 14 to 83, land mobile communications and cellular telephones.
A widely used portion of the frequency spectrum including television channels 14 to 83, land mobile communications and cellular telephones.
Ultra High Frequencies, 300 – 3000 MHz
Super High Frequencies, 3 – 30 GHz
These are microwave frequencies that are widely used for satellite and radar communications.
These are microwave frequencies that are widely used for satellite and radar communications.
Super High Frequencies, 3 – 30 GHz
Extremely High Frequencies, 30 – 300 GHz
Only a limited amount of activity occurs in this range including satellite communications and some specialized radar.
Infrared, 0.3 – 300 THz
Infrared refers to radiation generally associated with heat. Infrared is used in astronomy to detect stars, remote control units, guidance of weapon systems and optical devices.
Only a limited amount of activity occurs in this range including satellite communications and some specialized radar.
Extremely High Frequencies, 30 – 300 GHz
Infrared refers to radiation generally associated with heat. Infrared is used in astronomy to detect stars, remote control units, guidance of weapon systems and optical devices.
Infrared, 0.3 – 300 THz
Generally referred to as light. Used in various communication systems,
fiber optics and laser technology.
Visible Spectrum, 0.3 – 3 PHz
Visible Spectrum, 0.3 – 3 PHz
Generally referred to as light. Used in various communication systems,
fiber optics and laser technology.
