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NAVEDTRA 14090
ELECTRONICS TECHNICIAN VOLUME 05
NAVIGATION SYSTEMS
CHAPTER 2
NAVEDTRA 14090
ELECTRONICS TECHNICIAN VOLUME 05
NAVIGATION SYSTEMS
CHAPTER 2
TACAN is based on what type of
radio air-navigation system?
1. Polar-coordinate
2. Polar-sync
3. Neutral-coordinate
4. Neutral-sync
Instead of depending on radio-wave
reflection, beacon-transponders
generate what type of replies?
1. Neutral
2. Artificial
3. Basic
4. Torque
What type of decoders do TACAN
transponders use?
1. Twin–pulse
2. Single–pulse
3. Neutral–pulse
4. Basic–pulse
Which of the following receiver
controls provides noise–generated
output?
1. Fidelity
2. Sensitivity
3. Cycle
4. Squitter
If more interrogating aircraft come
into the TACAN’S range, the number
of noise–generated pulses will increase or decrease?
1. increase
2. decrease
What signal does the TACAN ground
station transmit to identify
itself?
1. Identification pulse group
2. Voice pulse group
3. Triangulation pulse group
4. Burst pulse group
What characteristic of the
transmitted TACAN pulses supplies
the distance information to
aircraft?
1. Amplitude
2. Frequency
3. Timing
4. Gain
What type of modulation is used to
convey TACAN bearing information?
1. Frequency
2. Pulse
3. Continuous wave
4. Amplitude modulation
What type of radiation pattern is
transmitted by the TACAN ground
station antenna?
1. Parabolic
2. Cardioid
3. Vectorial
4. Tangential
What is the common name of the
135–Hz reference burst?
1. Composite burst
2. North reference burst
3. Auxillary reference burst
4. East reference burst
How often is the identification
code broadcast?
1. Every 37.5 seconds
2. Every 60 seconds
3. Every 37.5 minutes
4. Every 60 minutes
What is the designation of latest
TACAN equipment in the fleet?
1. AN/URN–25
2. AN/URN-20
3. AN/URN-15
4. AN/URN–10
In the AS–3240 electronically–
scanned antenna, the old singlephase rotating parasitic element has been replaced by how many electronically–switched inner
parasitic elements?
1. 6
2. 12
3. 24
4. 32
What is one big advantage the
electronically–scanned antenna has
over the old mechanically–rotated
antenna?
1. It eliminates bandwidth
limitations
2. It is cheaper to build
3. It is easier to troubleshoot
4. It eliminates propagation
effects
The AN/URN-20 uses the same
electronically-scanned antenna as
the AN/URN-25.
1. True
2. False
What is the total number of TACAN
channels available using both X and
Y modes?
1. 68
2. 100
3. 126
4. 252
The TACAN receiver frequency is
always displaced how many MHz from
the transmitter frequency?
1. 20
2. 42
3. 63
4. 75
How many aircraft can be provided
distance data simultaneously?
1. 25
2. 50
3. 75
4. 100