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 TM 11-6625-2975-40
Section l ABBREVIATIONS
attenuator
atten
central processing unit
cpu
decibel
dB
difference in depth of modulation
DDM
DSCR
decrease
down/right
DIR
glide slope
GS
instrument landing system
ILS
increase
INCR
input/output
l/O
light emitting diode
LED
Iocalizer
LOC
marker beacon
MB
on course
OC
phase
PH
power
PWR
up/left
U/L
variable
VAR
very high frequency
VHF
VOR
very high frequency omnidirectional range
Section ll Definition OF UNUSUAL TERMS
Address. A pattern of characters that identifies a storage location.
Auxiliary signal. 30 Hz reference signal used in VOR mode.
Azimuth. Horizontal direction.
Bus. A parallel group of signal lines, grouped together because of similarity of functions, which
connect two assemblies or subassemblies.
Channel reject. Rejection of a radio frequency by navigational equipment.
Composite signal. Generated combined audio modulation signals.
Demodulation signal. The detected audio modulation with the rf carrier removed.
Omnidirectional range. A radio aid to navigation which indicates the magnetic bearing (omnibearing)
of that station from any azimuth.
Read. The act of retrieving a data word from memory.
Write. The act of entering a data word into memory.
2
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