Codan Radio Radio Repeater Systems Training Guide User Manual
Page 85
RADIO REPEATER SYSTEM | TRAINING GUIDE
Appendix J: Glossary of Terms Page 77
Spectrum
A range of frequencies within
which radiation has some specifi ed
characteristic, such as the audio-
frequency spectrum, radio spectrum or
the ultra-violet spectrum.
System
A combination of two or more stations
established in such a way as to provide
communications.
Transceiver
A combination of transmitting and
receiving equipment that uses some
or all of the components jointly in both
transmitting and receiving.
Transmission
The transfer of electrical energy from
one location to another.
Transmission Loss
A term used to denote the loss in power
during the transmission of energy from
one point to another.
Transmitter
The term applied to the equipment that
is used for generating and amplifying an
RF carrier signal, modulating this carrier
signal with intelligence, and then provide
output for an antenna to radiate the
modulated signal into space.
Trunk, Trunking
A computer controlled radio system in
which many users can share multiple
switched repeater equipment while
retaining privacy.
Two-Wire Line
A telephone line or pair that carries
audio in two directions.
Ultra-High Frequency (UHF)
The portion of the radio spectrum
extending from 300 - 3000 MHz.
(Commonly thought of as 300 - 1000
MHz)
Very-High Frequency (VHF)
The portion of the radio spectrum
extending from 30 - 300 MHz.
Voice Frequency
The frequency range necessary to
faithfully carry ordinary speech. In radio
systems voice frequency (VF) range is
300-3000 Hz.
Watt (W)
The basic unit of power equal to the
voltage multiplied by the current in
amperes.
Wavelength
In a periodic wave (frequency), the
distance between corresponding points
in two consecutive cycles.FSNF
Abbreviation for “Fragment Sequence
Number Field” in the Common Air
Interface.
Yagi
A directional antenna which usually
consists of a radiator, a refl ector
and one or more director elements.
This antenna exhibits high gain and
moderate front-to-back ratio.