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Crystal and frequency control glossary

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Harmonic level

Signal strength of the multiples of a fundamental frequency.


Abbreviation for heterojunction bipolar transistor.

Height Above Average Terrain (HAAT)

Measurement of tower height above surrounding average terrain.


Abbreviation for high electron mobility transistor.


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.


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.


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.


The complete housing for a quartz resonator plate. The holder includes the base and cover. See can and cover.

Holder - illustration

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.


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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