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Crystal and frequency control glossary
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Harmonic level
Signal strength of the multiples of a fundamental
frequency.
HBT
Abbreviation for heterojunction bipolar transistor.
Height Above Average Terrain (HAAT)
Measurement of tower height above surrounding average terrain.
HEMT
Abbreviation for high electron mobility transistor.
Henry
The basic unit of inductance,
identified by the letter H. One henry of inductance is produced in a
closed circuit by a current changing uniformly at the rate of one Ampere
per second.
Hermetic seal
An airtight seal.
Hertz
The basic unit of measurement of frequency, "Hertz" replaces
the term "cycle per second". Used to denote one complete occurrence
of an event in one second. Hertz is commonly abbreviated as Hz.
Heterodyne
To generate new frequencies by mixing two signals in a nonlinear device such as a transistor, or diode mixer. This results in the creation of two new frequencies, the sum of the two original frequencies and the difference. A low frequency produced in this manner is known as a beat frequency.
High frequency (HF)
Frequencies from 3 MHz
to 30 MHz commonly known
as shortwave. The carrier frequencies of 5, 10, and 15 MHz within this
spectrum are internationally allocated for time and frequency broadcasts,
and are used by a number of stations, including NIST radio stations
WWV and WWVH.
High-pass filter
A filter that passes frequencies
above a given frequency
and attenuates all others.
Holder
The complete housing for a quartz resonator plate. The holder includes
the base and cover. See can
and cover.
Holder capacitance
The sum of the stray capacity contributed by the crystal
connected between the two leads of the resonator.
Holder size
The measurement of the base and cover combined.
Home satellite dish (HSD)
A home receiver that permits the consumer to receive existing satellite
transmissions.
High-speed circuit-switched data (HSCSD)
High-Speed Circuit-Switched Data is circuit-switched wireless data
transmission for mobile users at data rates up to 38.4 Kbps, four times
faster than the standard data rates of the Global System for Mobile
(GSM) communication standard in 1999. HSCSD is comparable to the speed
of many computer modems that communicate with today's fixed telephone
networks.
Hydrothermal
A method of growing synthetic quartz using a pressure vessel, calcium
chloride or sodium chloride, and a quantity of natural quartz material.
Hypertext transfer protocol (HTTP)
In the World Wide Web, a protocol that facilitates the transfer of hypertext-based
files between local and remote systems.
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International Crystal Manufacturing
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73102
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