Communications Systems Glossary

 

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    High frequency (HF).  The high-frequency band is the radio-frequency (RF) band the range 3-30 MHz. The HF band provides relatively reliable propagation over long distances. Reasonable efficient antennas can be built requiring low radiated power.

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    Half-duplex transmission.  Half-duplex transmission is a data transmission mode in which a transmission path can carry information in both directions but in only one direction at a time.

    Hamming distance.  TheHamming distance is the number of digits that are different between two numbers. The Hamming distance between the two binary numbers 110010 and 110100 is 2, since two of the binary digits are different.

    Harmonic.  A harmonic is an integer multiple of a reference (fundamental) frequency.

    Header.  A header carriers control information that precedes user data in a data frame or packet.

    Henry (H).  The Henry is the SI unit of inductance.

    Hertz (Hz).  The Hertz (Hz) is the SI unit of frequency; one hertz is one cycle per second.

    Heterodyne.  Heterodyne describes the process of ‘beating’ two frequencies together to generate a frequency that is the difference between them.

    Highly elliptical orbit (HEO).  A highly elliptical orbit (HEO) is an elliptical satellite orbit that has a closest point to the earth is much closer than the farthest point away from the earth.

    Hub.  The hub is the centre point for the wiring of a star-wired network.

     

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    Our other resources include Antennas, Appliances, Broadband Internet, CDMA, Communications Systems, GSM, Modems, Project Management, Radar, Risk Management and Decision Making, Satellite Communications, SMS, Speakers, Systems Engineering, Team Building, Time Management, Transmitters and Receivers, and XML.
     
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