TM 43-6625-916-12
RADAR TEST SET
0001 00
GENERAL INFORMATION - Continued
PMCS
Preventive Maintenance Checks and Services
PN
Part Number
RF
Radio Frequency
RPL
Repair Parts List
RSLS
Receiver Side Lobe Suppression
RX
Receive/Receiver
SIF
Selective Identification Feature
SLS
Side Lobe Suppression
SPI
Serial Peripheral Interface
TA/RA
TCAS Traffic Advisory/Resolution Advisory
TCAS
Traffic Alert and Collision Avoidance System
TEST RPT
Test Repeat
TEST SEQ
Test Sequence
TM
Technical Manual
TNC
Threaded Type Connector
TX
Transmit/Transmitter
UPM
Utility Portable Maintenance
UUT
Unit Under Test
VCO
Voltage Controlled Oscillator
VER BIT A1
Verification BIT A1 word
VER BIT A2
Verification BIT A2 word
WP
Work Package
XPDR
Transponder
ALPHABETICAL LIST OF TERMS
Below is an alphabetical list of some of the terms commonly used in this manual.
Code A or B
Code A refers to the current day's Mode 4 code.
Code B refers to the next day's Mode 4 code.
Direct Connect tests
Tests performed by direct cable coupling to the transponder
set. Direct Connect testing can be useful when
troubleshooting a faulty transponder system. Direct connect
tests can be performed at any point between the
transponder/interrogator RF connection and the system's
antenna cable connection.
Emergency reply
A particular reply by an airborne transponder to indicate that
an emergency situation exists in the aircraft. This
emergency reply can be transmitted in modes 1, 2, and 3/A.
IFF
Identification friend or foe; a recognition system
used primarily for military purposes.
I/P
Identification of Position is a special SIF mode reply
(modes 1, 2, and 3/A only) which includes an SPI pulse.
The SPI replies are initiated by an IDENT switch on the
transponder system control panel.
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