H...

Half Transponder

A method of transmitting two television signals through the same transponder by reducing the deviation and power levels of the signals.  A reduction of anywhere from 4 to 7 dB of  the normal power used to achieve saturation for a single carrier is required to make this a viable option.

Headend

Generally the receive site for CATV systems.  The electronic control center that contains antennas, preamplifiers, frequency converters, demodulators, automatic switching equipment and other related equipment which amplifies, filters and converts incoming satellite and terrestrial television signals for insertion into the cable system channels.

Hertz (Hz)

The name given to the basic measure of radio frequency characteristics.  Named after German physicist Heinrich Hertz who proved the existence of electromagnetic waves and the concept of their alteration or frequency.  An electromagnetic wave completes a full oscillation from it's positive to negative pole and back again in what is known as a cycle.  A single Hertz is thus equal to one cycle per second.

Hop

A term used in signal routing applications to mean one segment in the path of the signal.  The path from the production facility to the uplink is considered one hop.  The path from the uplink through the satellite to the destination is also considered one hop even though two links were involved. A hop is one data link from a source to a destination.  A path from source to destination in a network is a series of hops.

Hub

The master station through which all communications to, from and between micro terminals must flow. 

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