IFF(2018) Flashcards
NAVEDTRA 14339
What does the acronym IFF stands for?
Identification Friend or Foe.
What are the three basic steps in the iden- tification process of a typical IFF system?
Challenge, decode, and reply.
True or False. All naval aircraft contain an interrogator system.
False.
What is the pulse spacing of Mode 1?
2.9 to 3.1 micro seconds.
Of the six modes of IFF operation, which one is used by military and civilian aircraft control stations?
Mode 3/A.
What mode IFF is the military encrypted mode?
Mode 4.
What is the transmission frequency of the interrogator?
1030 MHz.
In a typical IFF/SIF system, what total number of codes can be selected in Mode 2?
4,096.
The Identification of Position (I/P) pulse is used for what purpose?
It is used to identify a specific friendly aircraft among other friendly aircraft that reply with the same code.
What mode of IFF is set prior to takeoff by maintenance personnel?
Mode 2.
Where are Modes 1 and 3/A selected on the AN/APX-72 transponder set?
By thumbwheel switches on the front of the control box.
What part of the APX-72 system provides for ground or in-flight transponder testing capability?
The Transponder Test Set TS-1843/APX.
The AN/APX-72 generates a signal of what frequency when interrogated?
1090 MHz.
The interrogator works in conjunction with what other aircraft system?
The radar.
What component of the interrogator set is used to select SIF reply codes for Modes 1, 2, and 3/A?
C-7383/APX-76(V) control box.
What component monitors the timing triggers, pre-triggers, gates, and test video and causes the fault indicator lamp on the interrogator control to illuminate when a fault has been detected within the system?
Electronic Synchronizer SN-416/APX-76(V).
The APX-100 transponder set is available in what number of configurations?
The system comes in two configurations.
To respond to Mode 4 interrogations, the IFF transponder set system requires what addi- tional components?
Transponder Computer KIT-1/TSEC.
What APX-100 system is referred to as the rack-mounted configuration?
Receiver/Transmitter RT-1157/APX-100.
What electronic circuit compares both videos
in the AN/APX-100 system to determine the
stronger signal?
Diversity processor
What number of major configurations exist for
the AN/APX-100 system?
Two
The AN/APX-100 system contains what number of antenna(s)?
Two
The interrogator set works in conjunction with
which of the following systems?
Radar
What component of the interrogator set contains
performance monitoring circuits that perform
self-tests during each challenging period?
Switch Amplifier SA-1568/APX-76(V)
What component of the interrogator set
determines the delay between the challenge
pulse and receipt of the coded replies for
determining target range?
Receiver/Transmitter RT-868/APX-76(V)
Which of the following components of the
APX-72 system allow the transponder to
respond to Mode 4 interrogations?
KIT-1/TSEC
Which of the following APX-72 system
components provides for ground or in-flight
transponder testing capability?
TS-1843/APX
Which of the following components of the
APX-72 system contains controls for selection
of Modes 1 and 3/A?
C-6280/APX-72
When is the SPI pulse present in the reply pulse
train in Mode C?
When a D4 pulse is present
The X-pulse special reply function is used for
which of the following purposes?
Unmanned or experimental aircraft
The I/P function is used for which of the
following purposes?
Aircraft using identical coding
The emergency function affects which of the
following IFF mode(s)?
1, 2, and 3/A
Mode 4 codes are loaded into the transponder
computer by which of the following means?
Electronically
Which of the following IFF codes are set prior
to flight by maintenance personnel?
2 and 4
What is the total number of possible codes
available in Mode C IFF?
2048
In a typical IFF system, what total number
of combinations of codes can be selected in
Mode 1?
32
In a typical IFF system, what total number
of combinations of codes can be selected in
Mode C?
2048
Astandard SIF reply is bound by a total of how
many framing pulse(s)?
Two
What is the transmission frequency of the
transponder?
1090 MHz
What is the pulse spacing of Mode 1?
2.9 to 3.1 μs
What is the pulse spacing of Mode 2?
4.8 to 5.2 μs
What is the pulse spacing of Mode 3/A?
7.8 to 8.2 μs
Which of the following modes are used strictly
by the military as tactical modes for mission
and identification purposes?
1 and 2
What it the transmission frequency of the
interrogator?
1030 MHz
Which of the following modes of IFF operation
is the military encrypted mode?
Mode 4
What IFF mode of operation is used to report
altitude information?
Mode C
In a typical IFF system, what component is
referred to as the responding unit?
The transponder
In a typical IFF system, what component is
referred to as the challenging unit?
The interrogator