G–4
FM30/FM100/FM250 User's Manual
A B C
pre-emphasis The deliberate accentuation of the higher audio
frequencies; made possible by a high-pass filter.
processing The procedure and/or circuits used to modify
incoming audio to make it suitable for transmis-
sion.
receiver An option which adds incoming RF capability to an
existing transmitter. See also "Translator."
RF Radio Frequency; (1) A specific portion of the
electromagnetic spectrum between audio-fre-
quency 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 fre-
quency 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 in-
tended (50 ohms) load impedance.
THD Total Harmonic Distortion
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