Page 1-4 Vector-LP Radio Beacon Transmitter Technical Instruction Manual
Issue 1.1 Section 1 General information
Table 1-3: Glossary of Terms
TERM DESCRIPTION
ac Alternating current
AM Amplitude modulation
Bit Basic timing increment derived from master clock in keying unit.
Length is dependent on frame length and number of characters
used. An 8-bit frame is nominally 125 ms long.
Character Letter or number in the beacon identification signal
dBm Decibel reference 1 mW
dc Direct current
Element Smallest divisible part of a character. May be either a dot or a
dash
Frame Selected, fixed interval of time that is sufficiently long to
accommodate the beacon identification signal and an interval of
continuous tone. Normally set to 80 bits (10 seconds)
GUI Graphic user interface. Referred to as diagnostic display
throughout the manual
Hz Hertz
Modular Redundancy Identical modules operating in an overall system design such that
failure of one module does not affect the output of the system
PDM Pulse duration modulation
PSTN Public Switched Telephone Network
PWB Printed wiring board (also known as printed circuit board)
RF Radio frequency
SPI Serial Peripheral Interface
V ac Volts ac
VSWR Voltage standing wave ratio
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