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Avionic Common > Pulse > Flashcards

Pulse Flashcards

1
Q

What is the time taken for a transmitting pulse to return?

A

The echo is proportional to the distance of the sound waves had to travel.

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2
Q

What does RADALT provide?

A

Provides height information for terrain directly below the aircraft.

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3
Q

What does the pulse Doppler radar determine?

A

Targets speed and direction of travel.

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4
Q

What is search radar used for?

A

Uses range and azimuth of target.

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5
Q

What is the continuous wave radar used for? (Missile control)

A

To illuminate the target with RF energy and usually shares the same antenna with the pulse radar.

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6
Q

In a radar block diagram, what component switches between transmitting and receiving?

A

Duplexer (Connects to the antenna).

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7
Q

When regarding the duplexer, what is the TR switch?

A

A TR switch is sensitive to the direction of flow of RF energy; it allows the energy coming from the transmitter to pass with negligible attenuation to the antenna, while blocking the flow to the receiver. In simple terms, it is a wave guide switch.

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8
Q

What are the 2 most common types of antennas?

A
  • Parabolic (shape reflector) antenna (dish)
  • Planar array
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9
Q

What is the parabolic (dish) antenna?

A

The parabolic antenna (also known as the ‘dish’ antenna) consists of a flared end section of waveguide (known as a ‘horn’) which directs RF energy onto a parabolic dish. The parabolic shape of the dish reflects the RF energy into a narrow beam.

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10
Q

What are the 3 main components of a parabolic (dish) antenna?

A
  • Parabolic reflector
  • Horn
  • Radiated energy
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11
Q

What is the planar array?

A

Instead of employing a central feed that radiates the transmitted energy into a reflector, as in a parabolic antenna, a planar array consists of many individual slot radiators distributed over a flat surface.

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12
Q

C type display?

A

Elevation, Azimuth

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13
Q

Rotary joint - what is it?

A

Primary radar antenna is for a mechanical connection between a fixed section of waveguide and a section feeding a scanning antenna.

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14
Q

What component enables me to sample the transmitted RF energy?

A

Slot-Coupled Attenuator

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15
Q

Cannon plug and wave guide - Know the difference?

A

Be able to identify them by photos.

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16
Q

What does RADALT indicate?

A

Accurate reading at low altitude and low altitude warning.

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17
Q

How do we get a height indication on our RADLT system?

A

Transmit a CW and determine it off the time it takes to come back.

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18
Q

What component in the RADLT system loops my signal in test mode?

A

Delay unit / switch

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19
Q

How many pairs are there in the four beam Janice array?

A

2 pairs

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20
Q

Antenna array and rotor assembly - know the block diagram?

A

Know the block diagram.

21
Q

Relevant frequencies for secondary surveillance radar?

A

The airborne transponder receives the interrogating signal from the ground station: 1030 MHz (and automatically arranges to transmit a response in reply). The reply is transmitted: 1090 MHz. In simple terms: 1030MHz transmit - 1090MHz reply.

22
Q

How many antennas does a radar system have? And why?

A

2 antennas - 1 is transmit and 1 is receive.

23
Q

What is a special reply pulse in the secondary surveillance system?

A

Temporarily changing reply chain - momentarily identify you in a busy airspace.

24
Q

What does TCAS do?

A

Warn pilot of aircrafts that are present.

25
Q

What are the TCAS components?

A

Control panel

26
Q

What is the difference between traffic advisory (TA) and resolution advisory (RA)?

A

Traffic advisory (TA) indicates a potential threat, while resolution advisory (RA) requires maneuvers.

27
Q

What is the antenna transition in each quadrant?

A

90 degrees quadrants

28
Q

What is the function of ADS-B and its transition frequency?

A

Broadcast surveillance system for location and identification of aircrafts. Transition frequency is 1090MHz.

29
Q

What is the CDTI and its function?

A

Cockpit display Traffic information for situational awareness of aircraft in the area.

30
Q

What does the GPWS control panel switch inhibit?

A

It provides situational awareness to terrain and predicts terrain.

31
Q

What is mode 4?

A

Flying low and not ready to land - insufficient terrain clearance.

32
Q

What is the ADC and what does it receive?

A

ADC receives validity signal, altitude rate, and mach information.

33
Q

What should you know about GPWS?

A

Know the block diagram.

34
Q

What is an important maintenance consideration when working with coax?

A

Blanking caps should be used to prevent FOD.

35
Q

What are safety precautions when working with radar systems, particularly antennas?

A
  • Do not touch with your hands
  • Do not allow contact with metal
  • Antenna pressure must be bled before removal
  • Alert all personnel in the area that radar testing is to be carried out.
36
Q

What is used when carrying out radar maintenance?

A
  • Relevant maintenance documentation/manuals
  • Local standing instructions.
37
Q

What is the difference between ionizing and non-ionizing radiation?

A

Know the difference between the two signs.

38
Q

Choke flange joint - components?

A

One flange is flat and one flange is enlarged (Has a groove 1/4 of a wave length deep cut).

39
Q

Four beam Janice - Know the block diagram

A

Refer to the block diagram.

40
Q

Four beam Janice array - What type of radar system does it use?

A

Doppler radar waves.

41
Q

What does Doppler navigation provide us?

A

Ground speed and drift angle.

42
Q

Four beam Janice array - How does it indicate accurate heading?

A

The track bisects the angle between the beams; the received signal of each antenna will be identical.

43
Q

Indication that something has entered the TA space?

A

Sound - ‘traffic, traffic’.

44
Q

What happens when I use the precision height bug to set an altitude?

A

Gives verbal/visual indication when you cross below the altitude.

45
Q

How does secondary surveillance radar determine what mode is being interrogated?

A

Time difference between P1 and P3.

46
Q

How do we determine that we are not in the main beam?

A

P2 mode.

47
Q

What type of antenna transmits our P2?

A

Omni directional antenna.

48
Q

What information is included in the Mode S all call?

A

The second method only interrogates Mode S transponders and is known as a Mode S All Call. Aircraft responding to Mode S All Calls include their individual address (a 24-bit aircraft ID). TCAS computes the tracks of the responding aircraft and the flight crew are advised of the results via a display located in the cockpit.

Avionic Common (4 decks)

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