Campbell Scientific RF500M Radio Modem - Manual (Page 34)

Glossary
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Radio Frequency - The number of cycles per second with which the carrier
wave travels, usually specified in Megahertz.
Radiotelemetry - Process of transmitting data by radio communication.
Radiotelemetry Link - A temporary communication path within a network.
Radiotelemetry Network - A group of stations which communicate by radio
and are used to indicate or record data.
Reflected Power - Energy that is transferred back into the radio after it has
been transmitted by the same radio.
Remote Site - See Field Station.
Repeater - An intermediate station in an RF link used for the sole purpose of
relaying data.
RF - An abbreviation for radio frequency, commonly used in place of
radiotelemetry.
RF ID - A communication identification number for an RF Modem, also an
aid in specifying the RF path.
RF Modem - Device which modulates an electrical signal on the carrier wave,
and codes all transmissions for a specific path.
RF Path - The designation of an RF link with modem ID Numbers and
modem commands.
Signal Power - Power of a signal at the receiving radio, after power is lost
through transmission.
Start of Link Modem - The modem located at the base station.
Squelch - Setting on the radio which specifies the minimum power level which
signals must be received.
Sub Link - Any segment of an RF link which begins and ends with an RF
station.
UHF (Ultra High Frequency) - Carrier frequencies commonly in the range of
406 to 512 MHz.
VHF (Very High Frequency) - Carrier frequencies commonly in the range of
130 to 174 MHz.
VSWR (Voltage Standing Wave Ratio) - The ratio of the standing wave
voltage across the RF transmission cable at the high voltage points to that at
the low voltage points.
Unidirectional - Capable of operating only in a single direction.