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AT1 > IFF(2018) > Flashcards

IFF(2018) Flashcards

NAVEDTRA 14339

1
Q

What does the acronym IFF stands for?

A

Identification Friend or Foe.

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2
Q

What are the three basic steps in the iden- tification process of a typical IFF system?

A

Challenge, decode, and reply.

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3
Q

True or False. All naval aircraft contain an interrogator system.

A

False.

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4
Q

What is the pulse spacing of Mode 1?

A

2.9 to 3.1 micro seconds.

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5
Q

Of the six modes of IFF operation, which one is used by military and civilian aircraft control stations?

A

Mode 3/A.

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6
Q

What mode IFF is the military encrypted mode?

A

Mode 4.

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7
Q

What is the transmission frequency of the interrogator?

A

1030 MHz.

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8
Q

In a typical IFF/SIF system, what total number of codes can be selected in Mode 2?

A

4,096.

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9
Q

The Identification of Position (I/P) pulse is used for what purpose?

A

It is used to identify a specific friendly aircraft among other friendly aircraft that reply with the same code.

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10
Q

What mode of IFF is set prior to takeoff by maintenance personnel?

A

Mode 2.

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11
Q

Where are Modes 1 and 3/A selected on the AN/APX-72 transponder set?

A

By thumbwheel switches on the front of the control box.

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12
Q

What part of the APX-72 system provides for ground or in-flight transponder testing capability?

A

The Transponder Test Set TS-1843/APX.

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13
Q

The AN/APX-72 generates a signal of what frequency when interrogated?

A

1090 MHz.

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14
Q

The interrogator works in conjunction with what other aircraft system?

A

The radar.

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15
Q

What component of the interrogator set is used to select SIF reply codes for Modes 1, 2, and 3/A?

A

C-7383/APX-76(V) control box.

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16
Q

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?

A

Electronic Synchronizer SN-416/APX-76(V).

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17
Q

The APX-100 transponder set is available in what number of configurations?

A

The system comes in two configurations.

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18
Q

To respond to Mode 4 interrogations, the IFF transponder set system requires what addi- tional components?

A

Transponder Computer KIT-1/TSEC.

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19
Q

What APX-100 system is referred to as the rack-mounted configuration?

A

Receiver/Transmitter RT-1157/APX-100.

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20
Q

What electronic circuit compares both videos
in the AN/APX-100 system to determine the
stronger signal?

A

Diversity processor

21
Q

What number of major configurations exist for

the AN/APX-100 system?

A

Two

22
Q 
The AN/APX-100 system contains what number
of antenna(s)?
A

Two

23
Q

The interrogator set works in conjunction with

which of the following systems?

A

Radar

24
Q

What component of the interrogator set contains
performance monitoring circuits that perform
self-tests during each challenging period?

A

Switch Amplifier SA-1568/APX-76(V)

25
Q

What component of the interrogator set
determines the delay between the challenge
pulse and receipt of the coded replies for
determining target range?

A

Receiver/Transmitter RT-868/APX-76(V)

26
Q

Which of the following components of the
APX-72 system allow the transponder to
respond to Mode 4 interrogations?

A

KIT-1/TSEC

27
Q

Which of the following APX-72 system
components provides for ground or in-flight
transponder testing capability?

A

TS-1843/APX

28
Q

Which of the following components of the
APX-72 system contains controls for selection
of Modes 1 and 3/A?

A

C-6280/APX-72

29
Q

When is the SPI pulse present in the reply pulse

train in Mode C?

A

When a D4 pulse is present

30
Q

The X-pulse special reply function is used for

which of the following purposes?

A

Unmanned or experimental aircraft

31
Q

The I/P function is used for which of the

following purposes?

A

Aircraft using identical coding

32
Q

The emergency function affects which of the

following IFF mode(s)?

A

1, 2, and 3/A

33
Q

Mode 4 codes are loaded into the transponder

computer by which of the following means?

A

Electronically

34
Q

Which of the following IFF codes are set prior

to flight by maintenance personnel?

A

2 and 4

35
Q

What is the total number of possible codes

available in Mode C IFF?

A

2048

36
Q

In a typical IFF system, what total number
of combinations of codes can be selected in
Mode 1?

A

32

37
Q

In a typical IFF system, what total number
of combinations of codes can be selected in
Mode C?

A

2048

38
Q

Astandard SIF reply is bound by a total of how

many framing pulse(s)?

A

Two

39
Q

What is the transmission frequency of the

transponder?

A

1090 MHz

40
Q

What is the pulse spacing of Mode 1?

A

2.9 to 3.1 μs

41
Q

What is the pulse spacing of Mode 2?

A

4.8 to 5.2 μs

42
Q

What is the pulse spacing of Mode 3/A?

A

7.8 to 8.2 μs

43
Q

Which of the following modes are used strictly
by the military as tactical modes for mission
and identification purposes?

A

1 and 2

44
Q

What it the transmission frequency of the

interrogator?

A

1030 MHz

45
Q

Which of the following modes of IFF operation

is the military encrypted mode?

A

Mode 4

46
Q

What IFF mode of operation is used to report

altitude information?

A

Mode C

47
Q

In a typical IFF system, what component is

referred to as the responding unit?

A

The transponder

48
Q

In a typical IFF system, what component is

referred to as the challenging unit?

A

The interrogator

AT1 (31 decks)

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