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'''[[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. | |||
'''hamfest''' : An event at which hams can buy sell and swap equipment. Ofetn held in conjuction with lectures and demonstrations of equipment. | |||
'''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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'''Hertz''' : Hz - The unit of measure for [[Frequency Wavelength and Period |frequency]]. | '''Hertz''' : Hz - The unit of measure for [[Frequency Wavelength and Period |frequency]]. | ||
'''[[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. | ||
'''hi hi''' : The [[Morse Code | morse]] equivalent of laughter. | |||
'''Homebrew''' : Home built equipment. | |||
'''Horizontal Polarization''' : An antenna or radio signal in which the electric field is propagated parallel to the surface of the Earth. | '''Horizontal Polarization''' : An antenna or radio signal in which the electric field is propagated parallel to the surface of the Earth. | ||
'''HT''' : '''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'''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. | ||
Revision as of 16:04, 7 July 2009
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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.
hamfest : An event at which hams can buy sell and swap equipment. Ofetn held in conjuction with lectures and demonstrations of equipment.
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.
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 or radio signal in which the electric field is propagated parallel to the surface of the Earth.
HT : 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.