H: Difference between revisions
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==H== | ==H== | ||
'''HAAT''' : | '''HAAT''' : '''H'''eight '''A'''bove '''A'''verage '''T'''errain. | ||
'''[[Harmonics | Harmonic]]''' : Integer multiples of the fundamental frequency being generated, harmonics are present if a signal is not perfectly sinusoidal or is undergoing intermodulation distortion. Harmonics located outside the desired band for transmission are normally removed with low-pass filters to avoid interference to other radio services. | '''[[Harmonics | Harmonic]]''' : Integer multiples of the fundamental frequency being generated, harmonics are present if a signal is not perfectly sinusoidal or is undergoing intermodulation distortion. Harmonics located outside the desired band for transmission are normally removed with low-pass filters to avoid interference to other radio services. | ||
'''Half Duplex''' : The ability for a transceiver to transmit and receive on two different frequencies, but ony one of these at any given time. | |||
'''Half wave dipole''' : An [[Antennas |antenna]] that is half a wavelength total, fed at the centre. | |||
'''HASL''' : '''H'''eight '''A'''bove '''S'''ea '''L'''evel. Often used for mountaintop stations such as repeaters and portable operations to describe their elevation. Measured in either feet or metres depending on the country. | |||
'''hamfest''' : An event at which hams can buy sell and swap equipment. Often held in conjuction with lectures and demonstrations of equipment. | |||
'''[[Harmonics | Harmonic]]''' : An integer multiple of a [[Frequency_Wavelength_ and Period | frequency]] | |||
'''Harmonic (of a ham) ''' : Slang term for the child of a ham. | '''Harmonic (of a ham) ''' : Slang term for the child of a ham. | ||
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'''Henry''' :(H) The unit for [[Inductors |inductance]] | '''Henry''' :(H) The unit for [[Inductors |inductance]] | ||
'''Hertz''' : Hz - The unit of measure for [[Frequency Wavelength and Period |frequency]]. | '''Hertz''' : Hz - The unit of measure for [[Frequency Wavelength and Period |frequency]]. Named after [http://en.wikipedia.org/wiki/Heinrich_Hertz Heinrich Hertz] | ||
'''[[HF]]''' : | '''[[HF]]''' : '''H'''igh '''F'''requency. Frequencies in the range 3MHz to 30MHz, also known as shortwave. | ||
'''High Pass Filter''' : A [[Filters |filter]] designed to pass high frequency signals. | '''High Pass Filter''' : A [[Filters |filter]] designed to pass high frequency signals. | ||
'''Horizontal Polarization''' : An antenna | '''hi hi''' : The [[Morse code | morse]] equivalent of laughter. | ||
'''Homebrew''' : Home built equipment. | |||
'''Horizontal Polarization''' : An [[Antennas |antenna]] which projects a radio signal in which the electric field is parallel to the surface of the earth '''OR''' a radio signal of which the electric field is propagated parallel to the surface of the Earth. | |||
'''HT (1)''' : '''H'''andheld '''T'''ransceiver or '''H'''andi'''T'''alkie. Usually refers to transceivers that operate in the [[2 metres | 2m]] and [[70 centimetres | 70cm]] amateur bands; these are self-contained hand-held radios which include an antenna and battery and transmit at low power. | |||
'''HT''' : '''H''' | '''HT (2)''' : '''H'''igh '''T'''ension Voltage. Voltages over 500V | ||
Latest revision as of 21:45, 20 December 2010
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H
HAAT : Height Above Average Terrain.
Harmonic : Integer multiples of the fundamental frequency being generated, harmonics are present if a signal is not perfectly sinusoidal or is undergoing intermodulation distortion. Harmonics located outside the desired band for transmission are normally removed with low-pass filters to avoid interference to other radio services.
Half Duplex : The ability for a transceiver to transmit and receive on two different frequencies, but ony one of these at any given time.
Half wave dipole : An antenna that is half a wavelength total, fed at the centre.
HASL : Height Above Sea Level. Often used for mountaintop stations such as repeaters and portable operations to describe their elevation. Measured in either feet or metres depending on the country.
hamfest : An event at which hams can buy sell and swap equipment. Often held in conjuction with lectures and demonstrations of equipment.
Harmonic : An integer multiple of a frequency
Harmonic (of a ham) : Slang term for the child of a ham.
Hellschreiber (Hell) : A digital mode for sending and receiving text using facsimile (fax) technology.
Henry :(H) The unit for inductance
Hertz : Hz - The unit of measure for frequency. Named after Heinrich Hertz
HF : High Frequency. Frequencies in the range 3MHz to 30MHz, also known as shortwave.
High Pass Filter : A filter designed to pass high frequency signals.
hi hi : The morse equivalent of laughter.
Homebrew : Home built equipment.
Horizontal Polarization : An antenna which projects a radio signal in which the electric field is parallel to the surface of the earth OR a radio signal of which the electric field is propagated parallel to the surface of the Earth.
HT (1) : Handheld Transceiver or HandiTalkie. Usually refers to transceivers that operate in the 2m and 70cm amateur bands; these are self-contained hand-held radios which include an antenna and battery and transmit at low power.
HT (2) : High Tension Voltage. Voltages over 500V