V: Difference between revisions
(New page: {{glossary}} ==V== ''' Volt''' : (V) The unit of electric potential difference (Voltage) between two points. '''VA''' : Volt Amperes - measure of apparent power. '''VA...) |
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'''VAC''' : Volts Alternating Current. | '''VAC''' : Volts Alternating Current. | ||
'''[http://en.wikipedia.org/wiki/Vacuum_tube Vacuum Tube]''' : (Also known as an '''Electron Tube''' or a '''Thermionic Valve'''). A device that creates or modifies an electrical signal through the movement of electrons in a low pressure (vacuum) space. | |||
'''Varactor Diode''' : a component whose capacitance decreases as the reverse bias voltage is increased. | '''Varactor Diode''' : a component whose capacitance decreases as the reverse bias voltage is increased. | ||
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'''VE''' : Volunteer Examiner, in countries in which government radio inspectors no longer conduct examinations for prospective new licensees but delegate this task to a few experienced radio amateurs. (Also: VE as a [[Callsign_database#Callsign_prefixes_by_Prefix | callsign prefix]] refers to the Dominion of Canada - so "W/VE stations" would indicate the continent of North America.) | '''VE''' : Volunteer Examiner, in countries in which government radio inspectors no longer conduct examinations for prospective new licensees but delegate this task to a few experienced radio amateurs. (Also: VE as a [[Callsign_database#Callsign_prefixes_by_Prefix | callsign prefix]] refers to the Dominion of Canada - so "W/VE stations" would indicate the continent of North America.) | ||
'''Vertical | '''VEC''' : Volunteer Examiner Coordinator | ||
'''Vertical Polarization''' : Used to describe a transmission or antenna in which the electric field is propagated perpendicular to the surface of the Earth. Antennas intended for two-way radio communication with mobile stations (where [[vertical antenna]]s are common) typically use vertical polarization, while broadcast TV/FM signals are most often horizontally polarised. | |||
'''VFO''' : Variable Frequency Oscillator | '''VFO''' : Variable Frequency Oscillator | ||
'''Velocity Factor''' : the speed at which radio waves travel in a particular [[Feedlines | feedline]], expressed as a | '''Velocity Factor''' : the speed at which radio waves travel in a particular [[Feedlines | feedline]], expressed as a fraction of the speed of light | ||
'''[[VHF]]''' : Very High Frequency. Frequencies in the range 30MHz to 300MHz | '''[[VHF]]''' : Very High Frequency. Frequencies in the range 30MHz to 300MHz | ||
'''VIS''' : Vertical Interval Signalling. Digital encoding of the transmission mode in the vertical sync portion of an [[Slow-Scan Television (SSTV) | SSTV]] image. | '''VIS''' : Vertical Interval Signalling. Digital encoding of the transmission mode in the vertical sync portion of an [[Slow-Scan Television (SSTV) | SSTV]] image. | ||
'''VLCA''' : Very limited coverage area. Typically used in reference to small portable repeaters deployed by emergency/disaster or public service groups to temporarily provide local communication within a relatively-small area. | |||
'''[[Bands | VLF]]''' : Very Low Frequency 3 - 30 KHz | '''[[Bands | VLF]]''' : Very Low Frequency 3 - 30 KHz | ||
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'''VSWR''' : Voltage standing wave ratio | '''VSWR''' : Voltage standing wave ratio | ||
'''VK''' : Australia | |||
'''VXO''' : Variable crystal oscillator | '''VXO''' : Variable crystal oscillator | ||
'''VY''' : CW abbreviation for "very" | |||
Latest revision as of 02:05, 29 January 2011
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V
Volt : (V) The unit of electric potential difference (Voltage) between two points.
VA : Volt Amperes - measure of apparent power.
VAC : Volts Alternating Current.
Vacuum Tube : (Also known as an Electron Tube or a Thermionic Valve). A device that creates or modifies an electrical signal through the movement of electrons in a low pressure (vacuum) space.
Varactor Diode : a component whose capacitance decreases as the reverse bias voltage is increased.
VCO : Voltage-controlled oscillator
VE : Volunteer Examiner, in countries in which government radio inspectors no longer conduct examinations for prospective new licensees but delegate this task to a few experienced radio amateurs. (Also: VE as a callsign prefix refers to the Dominion of Canada - so "W/VE stations" would indicate the continent of North America.)
VEC : Volunteer Examiner Coordinator
Vertical Polarization : Used to describe a transmission or antenna in which the electric field is propagated perpendicular to the surface of the Earth. Antennas intended for two-way radio communication with mobile stations (where vertical antennas are common) typically use vertical polarization, while broadcast TV/FM signals are most often horizontally polarised.
VFO : Variable Frequency Oscillator
Velocity Factor : the speed at which radio waves travel in a particular feedline, expressed as a fraction of the speed of light
VHF : Very High Frequency. Frequencies in the range 30MHz to 300MHz
VIS : Vertical Interval Signalling. Digital encoding of the transmission mode in the vertical sync portion of an SSTV image.
VLCA : Very limited coverage area. Typically used in reference to small portable repeaters deployed by emergency/disaster or public service groups to temporarily provide local communication within a relatively-small area.
VLF : Very Low Frequency 3 - 30 KHz
VMOS : Vertical metal-oxide semiconductor
VOX : Voice Operated Transmit
VSWR : Voltage standing wave ratio
VK : Australia
VXO : Variable crystal oscillator
VY : CW abbreviation for "very"