Navedtra 14090 Electronics Technician Volume 05 Navigation Systems Chapter 2

Front 1

NAVEDTRA 14090
ELECTRONICS TECHNICIAN VOLUME 05
NAVIGATION SYSTEMS
CHAPTER 2

Back 1

NAVEDTRA 14090
ELECTRONICS TECHNICIAN VOLUME 05
NAVIGATION SYSTEMS
CHAPTER 2

Front 2

TACAN is based on what type of
radio air-navigation system?

Back 2

1. Polar-coordinate
2. Polar-sync
3. Neutral-coordinate
4. Neutral-sync

Front 3

Instead of depending on radio-wave
reflection, beacon-transponders
generate what type of replies?

Back 3

1. Neutral
2. Artificial
3. Basic
4. Torque

Front 4

What type of decoders do TACAN
transponders use?

Back 4

1. Twin–pulse
2. Single–pulse
3. Neutral–pulse
4. Basic–pulse

Front 5

Which of the following receiver
controls provides noise–generated
output?

Back 5

1. Fidelity
2. Sensitivity
3. Cycle
4. Squitter

Front 6

If more interrogating aircraft come
into the TACAN’S range, the number
of noise–generated pulses will increase or decrease?

Back 6

1. increase
2. decrease

Front 7

What signal does the TACAN ground
station transmit to identify
itself?

Back 7

1. Identification pulse group
2. Voice pulse group
3. Triangulation pulse group
4. Burst pulse group

Front 8

What characteristic of the
transmitted TACAN pulses supplies
the distance information to
aircraft?

Back 8

1. Amplitude
2. Frequency
3. Timing
4. Gain

Front 9

What type of modulation is used to
convey TACAN bearing information?

Back 9

1. Frequency
2. Pulse
3. Continuous wave
4. Amplitude modulation

Front 10

What type of radiation pattern is
transmitted by the TACAN ground
station antenna?

Back 10

1. Parabolic
2. Cardioid
3. Vectorial
4. Tangential

Front 11

What is the common name of the
135–Hz reference burst?

Back 11

1. Composite burst
2. North reference burst
3. Auxillary reference burst
4. East reference burst

Front 12

How often is the identification
code broadcast?

Back 12

1. Every 37.5 seconds
2. Every 60 seconds
3. Every 37.5 minutes
4. Every 60 minutes

Front 13

What is the designation of latest
TACAN equipment in the fleet?

Back 13

1. AN/URN–25
2. AN/URN-20
3. AN/URN-15
4. AN/URN–10

Front 14

In the AS–3240 electronically–
scanned antenna, the old singlephase rotating parasitic element has been replaced by how many electronically–switched inner
parasitic elements?

Back 14

1. 6
2. 12
3. 24
4. 32

Front 15

What is one big advantage the
electronically–scanned antenna has
over the old mechanically–rotated
antenna?

Back 15

1. It eliminates bandwidth
limitations
2. It is cheaper to build
3. It is easier to troubleshoot
4. It eliminates propagation
effects

Front 16

The AN/URN-20 uses the same
electronically-scanned antenna as
the AN/URN-25.

Back 16

1. True
2. False

Front 17

What is the total number of TACAN
channels available using both X and
Y modes?

Back 17

1. 68
2. 100
3. 126
4. 252

Front 18

The TACAN receiver frequency is
always displaced how many MHz from
the transmitter frequency?

Back 18

1. 20
2. 42
3. 63
4. 75

Front 19

How many aircraft can be provided
distance data simultaneously?

Back 19

1. 25
2. 50
3. 75
4. 100