{"id":158,"date":"2007-11-17T12:35:06","date_gmt":"2007-11-17T12:35:06","guid":{"rendered":"https:\/\/www.garfnet.org.uk\/cms\/commonly-used-radio-terminology\/"},"modified":"2025-10-27T03:37:31","modified_gmt":"2025-10-27T03:37:31","slug":"commonly-used-radio-terminology","status":"publish","type":"page","link":"https:\/\/garfnet.org.uk\/cms\/tables\/radio-frequencies\/commonly-used-radio-terminology\/","title":{"rendered":"Commonly used radio terminology"},"content":{"rendered":"<p><b>This is a brief list of some commonly used terms and expressions used by radio enthusiasts and resellers. It is not an exhaustive list and many of the terms can be found in greater detail in the Wikipedia.<\/b><\/p>\n<blockquote>\n<ul>\n<li><b> <a title=\"Wikipedia\" href=\"http:\/\/www.wikipedia.org\" target=\"_blank\" rel=\"noopener\">http:\/\/www.wikipedia.org<\/a><br \/>\n<\/b><\/li>\n<\/ul>\n<\/blockquote>\n<hr>\n<table class=\"aligncenter mtr-table mtr-thead-th\" style=\"width: 100%; border-collapse: collapse;\" border=\"0\" cellpadding=\"4\">\n<thead>\n<tr style=\"height: auto;\">\n<th style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"term\"}' data-mtr-content=\"Term\" class=\"mtr-th-tag\"><div class=\"mtr-cell-content\">Term<\/div><\/th>\n<th style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"meaning\"}' data-mtr-content=\"Meaning\" class=\"mtr-th-tag\"><div class=\"mtr-cell-content\">Meaning<\/div><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"AM\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">AM<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Amplitude modulation \u2013 a method of encoding an audio signal by varying the amplitude of the carrier wave. The term AM is often (incorrectly) used to describe the medium frequency or medium wave band. AM is common on low frequency\\\/longwave, medium frequency\\\/medium wave and high frequency\\\/shortwave bands. AM is also used for the VHF aircraft band.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Amplitude modulation \u2013 a method of encoding an audio signal by varying the amplitude of the carrier wave. The term AM is often (incorrectly) used to describe the medium frequency or medium wave band. AM is common on low frequency\/longwave, medium frequency\/medium wave and high frequency\/shortwave bands. AM is also used for the VHF aircraft band.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"Bandwidth control\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Bandwidth control<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Bandwidth control on a short-wave radio receiver allows you to control the selectivity of the receiver so that interference can be reduced considerably.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Bandwidth control on a short-wave radio receiver allows you to control the selectivity of the receiver so that interference can be reduced considerably.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"CW\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">CW<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Carrier ware or continuous wave. This is used for Morse code transmission.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Carrier wave or continuous wave. This is used for Morse code transmission.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"DSP\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">DSP<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Digital signal processing. The use of digital processing, such as by computers or specialised digital signal processors, to perform a variety of signal processing operations. \"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Digital signal processing. The use of digital processing, such as by computers or specialised digital signal processors, to perform a variety of signal processing operations.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"EON\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">EON<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Enhanced other network. A traffic radio subsystem that allows one to listen to an RDS programme without missing news even from other networks.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Enhanced other network. A traffic radio subsystem that allows one to listen to an RDS programme without missing news even from other networks.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"FM\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">FM<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Frequency modulation. This is where an audio signal is encoded by slightly varying the frequency of the carrier wave. The term FM is often used (incorrectly) to describe the VHF wave band. However, many countries also use frequency modulation for UHF television sound.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Frequency modulation. This is where an audio signal is encoded by slightly varying the frequency of the carrier wave. The term FM is often used (incorrectly) to describe the VHF wave band. However, many countries also use frequency modulation for UHF television sound.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"HF\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">HF<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"High frequency. Also referred to by wavelength as SW, shortwave. Radio frequencies between 3 MHz and 30 MHz.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">High frequency. Also referred to by wavelength as SW, shortwave. Radio frequencies between 3 MHz and 30 MHz.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"Ionosphere Shortwaves travel around the earth by bouncing between the earth and the ionosphere (The part of the earth\u2019s atmosphere that reflects shortwave back to the earth).\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Ionosphere<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">The ionised part of the upper atmosphere of Earth, from about 48 km to 965 km above sea level. It includes the thermosphere and parts of the mesosphere and exosphere. The ionosphere is ionised by solar radiation.\u00a0 It influences radio propagation to distant places on Earth. Shortwaves travel around the earth by bouncing between the earth and the ionosphere.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"LCD\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">LCD<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Liquid crystal display \u2013 many digital radio\u2019s and radio scanners have LCD displays.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Liquid crystal display \u2013 many digital radio\u2019s and radio scanners have LCD displays.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"LF\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">LF<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Low frequency also referred to by wavelength as LW, long wave. Radio frequencies between 30 kHz and 300 kHz \"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Low frequency also referred to by wavelength as LW, long wave. Radio frequencies between 30 kHz and 300 kHz<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"Local\\\/DX switch\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Local\/DX switch<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"DX stands for distance. This switch adjusts the sensitivity of the radio to improve reception of distant stations or prevent over loading of the radio by a very strong local transmitter.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">DX stands for distance. This switch adjusts the sensitivity of the radio to improve reception of distant stations or prevent over loading of the radio by a very strong local transmitter.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"MF\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">MF<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Medium frequency also referred to by wavelength as MW, medium wave. Radio frequencies between 300 kHz and 3 MHz.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Medium frequency also referred to by wavelength as MW, medium wave. Radio frequencies between 300 kHz and 3 MHz.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"NFM\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">NFM<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Narrow frequency modulation \u2013 as distinct from WFM, wide frequency modulation. This is used in communications radio such as UK citizens band radio. It allows a lot of channels for a small bandwidth but the audio quality is poor in comparison to wide FM.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Narrow frequency modulation \u2013 as distinct from WFM, wide frequency modulation. This is used in communications radio such as UK citizens band radio. It allows a lot of channels for a small bandwidth but the audio quality is poor in comparison to wide FM.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"Notch Filter\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Notch Filter<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"A notch filter removes a very narrow slice from a received signal. either from the radio frequency itself (RF notch) or from the audio output (audio notch) of the receiver.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">A notch filter removes a very narrow slice from a received signal. either from the radio frequency itself (RF notch) or from the audio output (audio notch) of the receiver.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"Narrow\\\/Wide switch\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Narrow\/Wide switch<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"With so many stations broadcast on adjacent frequencies, its is possible to adjust the signal bandwidth and sharpen the tuning to reduce unwanted noise.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">With so many stations broadcast on adjacent frequencies, its is possible to adjust the signal bandwidth and sharpen the tuning to reduce unwanted noise.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"Pre-sets\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Pre-sets<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"This allows you to programme your favourite stations on you radio.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">This allows you to programme your favourite stations on you radio.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"PLL\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">PLL<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Phase Lock Loop. An electronic circuit in digital radios that locks onto your chosen station to give clear drift free reception.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Phase Lock Loop. An electronic circuit in digital radios that locks onto your chosen station to give clear drift free reception.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"RDS\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">RDS<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Radio Data System \u2013 this enables the radio receiver to display the radio station name and depending on the model of radio, some program information as well.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Radio Data System \u2013 this enables the radio receiver to display the radio station name and depending on the model of radio, some program information as well.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"RF Gain\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">RF Gain<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Radio frequency gain control is a control that permits the sensitivity of the receiver to be continuously varied.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Radio frequency gain control is a control that permits the sensitivity of the receiver to be continuously varied.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"SSB\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">SSB<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Single Sideband ability to receive signals from the upper or lower part of the carrier wave. This is needed to listen to ham radio and utility stations. Single side band operation makes it possible to concentrate the full transmission energy with suppressed carrier noise.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Single Sideband ability to receive signals from the upper or lower part of the carrier wave. This is needed to listen to ham radio and utility stations. Single side band operation makes it possible to concentrate the full transmission energy with suppressed carrier noise.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"Scanning\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Scanning<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"This feature allows the receiver to automatically tune through a desired frequency range, stopping on all frequencies where a signal is present.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">This feature allows the receiver to automatically tune through a desired frequency range, stopping on all frequencies where a signal is present.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"SDR\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">SDR<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Software defined radio. Processing radio signals using software rather than conventional tuned circuits.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Software defined radio. Processing radio signals using software rather than conventional tuned circuits.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"Selectivity\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Selectivity<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"The ability of the receiver to select the station it is tuned to, and to reject signals from all the other stations broadcasting on a nearby frequency.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">The ability of the receiver to select the station it is tuned to, and to reject signals from all the other stations broadcasting on a nearby frequency.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"Sensitivity\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Sensitivity<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"The ability of a shortwave radio to pick-up weak signals. It is usually measured in microvolts. The lower the measurement in microvolts, the weaker the signal the radio can receive.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">The ability of a shortwave radio to pick-up weak signals. It is usually measured in microvolts. The lower the measurement in microvolts, the weaker the signal the radio can receive.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"Squelch\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Squelch<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"This mutes the receiver audio when the strength of the signal drops below a preset level.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">This mutes the receiver audio when the strength of the signal drops below a preset level.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"Synchronous detection\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Synchronous detection<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"This feature is found on some modern shortwave receivers such as the Grundig Satellite 800, Sony SW7600 and SW100E. It is a circuit that replaces the carrier in an AM signal with an internally generated replacement signal to reduce the effects of fading.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">This feature is found on some modern shortwave receivers such as the Grundig Satellite 800, Sony SW7600 and SW100E. It is a circuit that replaces the carrier in an AM signal with an internally generated replacement signal to reduce the effects of fading.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"Variable Bandwidth Tuning\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Variable Bandwidth Tuning<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"This is a circuit that allows the selectivity of a receiver to be continuously varied.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">This is a circuit that allows the selectivity of a receiver to be continuously varied.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"VHF\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">VHF<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Very high frequency. Radio frequencies between 30 MHz and 300 MHz.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Very high frequency. Radio frequencies between 30 MHz and 300 MHz.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"UHF\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">UHF<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Ultra high frequency. Radio frequencies between 300 MHz and 3 GHz\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Ultra high frequency. Radio frequencies between 300 MHz and 3 GHz<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"WFM Wide frequency modulation\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">WFM\u00a0<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"as distinct from NFM. WFM is used for high quality audio on the broadcast VHF &amp; UHF bands for FM Radio and analogue television.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Wide frequency modulation, as distinct from NFM. WFM is used for high quality audio on the broadcast VHF &amp; UHF bands for FM Radio and analogue television.<\/div><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 10.9827%; height: auto; vertical-align: middle;\" align=\"left\" height=\"17\" data-sheets-value='{ \"1\": 2, \"2\": \"World Band\"}' data-mtr-content=\"Term\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">World Band<\/div><\/td>\n<td style=\"width: 88.8006%; height: auto; vertical-align: middle;\" align=\"left\" data-sheets-value='{ \"1\": 2, \"2\": \"Another name for the high frequency or shortwave band.\"}' data-mtr-content=\"Meaning\" class=\"mtr-td-tag\"><div class=\"mtr-cell-content\">Another name for the high frequency or shortwave band.<\/div><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr>\n<p style=\"text-align: center;\"><a href=\"..\/..\/..\/\">Home<\/a> | <a href=\"..\/..\/\">Tables<\/a> | <a href=\"..\/\">Radio Frequencies<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This is a brief list of some commonly used terms and expressions used by radio enthusiasts and resellers. It is not an exhaustive list and many of the terms can be found in greater detail in the Wikipedia. http:\/\/www.wikipedia.org Term Meaning AM Amplitude modulation \u2013 a method of encoding an audio signal by varying the&#8230;<\/p>\n","protected":false},"author":1,"featured_media":9617,"parent":590,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ngg_post_thumbnail":0,"_kad_post_transparent":"default","_kad_post_title":"default","_kad_post_layout":"default","_kad_post_sidebar_id":"","_kad_post_content_style":"default","_kad_post_vertical_padding":"default","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"class_list":["post-158","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Commonly used radio terminology - GarfNet<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/garfnet.org.uk\/cms\/tables\/radio-frequencies\/commonly-used-radio-terminology\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Commonly used radio terminology - GarfNet\" \/>\n<meta property=\"og:description\" content=\"This is a brief list of some commonly used terms and expressions used by radio enthusiasts and resellers. 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