3-50
Replaceable Parts
Assemblies and Hardware Options
Abbreviations Used in Part Descriptions
This section defines the reference designators, abbreviations, and option numbers that are used in
the part descriptions throughout this chapter.
Reference
Designator
Definition
A assembly
AT attenuator
Bfan
DS lamp
J electrical connector; jack
W cable; transmission path; wire
Abbreviation Definition
BN buttonhead (screws)
CPU central processing unit
CW conical washer (screws)
EXT external
FL flathead (screws)
Ft feet
Hex hexagonal
GPIB general purpose interface bus
HX hexagonal recess (screws)
Iin-phase
LF low frequency
M meters or metric hardware
PC patch lock (screws) or printed circuit
PN panhead (screws)
Qquadrature
Qty quantity
RF radio frequency
RPP reverse power protection
SMA subminiature type-A
TX TORX recess (screws)
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