RADAR TEST SET
GENERAL INFORMATION - Continued
Preventive Maintenance Checks and Services
Repair Parts List
Receiver Side Lobe Suppression
Selective Identification Feature
Side Lobe Suppression
Serial Peripheral Interface
TCAS Traffic Advisory/Resolution Advisory
Threaded Type Connector
Utility Portable Maintenance
Unit Under Test
VER BIT A1
Verification BIT A1 word
VER BIT A2
Verification BIT A2 word
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
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.
Identification friend or foe; a recognition system
used primarily for military purposes.
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.