RF Radio Frequency;
(1) A specific portion of the electromagnetic
spectrum between audio-frequency and the infrared
portion.
(2) A frequency useful for radio transmission
(roughly 10 kHz and 100,000 MHz).
SCA Subsidiary Communications Authorization; see
“subcarrier.”
S/N Signal to Noise
Spurious products Unintended signals present on the transmission
output terminal.
Stability A tolerance or measure of how well a component,
circuit, or system maintains constant operating
conditions over a period of time.
Stereo Pilot See “Pilot.”
Stereo separation The amount of left channel information that bleeds
into the right channel (or vice versa).
Subcarrier A carrier signal which operates at a lower frequency
than the main carrier frequency and which
modulates the main carrier.
Suppression The process used to hold back or stop certain
frequencies.
SWR Standing Wave Ratio; on a transmission line, the
ratio of the maximum voltage to the minimum
voltage or maximum current to the minimum current;
also the ratio of load impedance to intended
(50 ohms) load impedance.
THD Total Harmonic Distortion
Translator A transmitter designed to internally change an FM
signal from one frequency to another for
retransmission. Used in conjunction with terrestrial
networks.
Satellator A transmitter equipped with an FSK ID option for
re-broadcasting a satellite fed signal.
VSWR Voltage Standing Wave Ratio; see “SWR.”
Wideband See “Broadband.”
VCO Voltage Controlled Oscillator
FM600 User’s Manual G-4
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