SEA 7157 Operator's Manual page 47

GLOSSARY
DEFINITIONS
PTT: Push To Talk refers to the microphone button.
RF: Radio Frequency.
ROM: Read Only Memory.
RX: Shorthand for Receive.
SIMPLEX: A channel using the same transmit and receive frequency.
SINAD: A method of measuring SIgnal to Noise And Distortion.
SQUELCH: A circuit that mutes the speaker when no signal is present.
TTY: TeleTYpewriter.
TX: Shorthand for Transmit.
UHF: Ultra High Frequency.
USCG: United States Coast Guard.
UTC: Universal Coordinated Time is located at the prime meridian.
µV: micro (µ) Volt is 1 millionth of 1 volt.
V.xx: ITU standards defining how signals are generated and protocols used.
VHF: Very High Frequency.
VSWR: Voltage Standing Wave Ratio, is a measurement figure that helps
determine how well the radio is matched to the antenna system.
X: Shorthand for "Trans" as in Xmission (transmission).
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