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Pulse Class > Transponder Mode A and C > Flashcards

Transponder Mode A and C Flashcards

1
Q

The ground radar consists of what?

A

Primary and SSR

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2
Q

What does the primary radar do?

A

Gives back echo/reply. Gives us BEARING and DISTANCE in relation to time

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3
Q

What does the Secondary Surveillance Radar do?

A

Moves around with the primary radar to interrogate the aircraft. (30miles) (P1,P3)

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4
Q

How many MHz on the SSR?

A

1030MHz

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5
Q

Mode A reply consists of what?

A

Code Reply

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6
Q

If the reply contains ALTITUDE, which mode is it?

A

Mode C

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7
Q

In a ground station interrogation, there are 500pps. How are they divided for each mode?

A

300 mode C
150 mode A
50 mode S

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8
Q

Where does Flight Level come from?

A

Encoding Altimeter

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9
Q

What is after the receiver and what does it do?

A

After the receiver is the mixer/oscillator which mixes the received 1030MHz with and 970MHz, thus resulting in an IF of 60MHz

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10
Q

What does the DECODER do?

A

Wants to know whether if the signal is a mode A or C, then initiates the MODULATOR

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11
Q

If we are using the CODE SELECTOR, what mode was decoded?

A

Mode A

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12
Q

If a mode C was decoded, what does the pilot use for input?

A

Encoding Altimeter

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13
Q

Aircraft Transponder transmission is how many MHz?

A

1090Mhz

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14
Q

What does the suppression do?

A

For when the DME is transmitting and the aircraft doesn’t mistake it for an interrogation

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15
Q

What is the pulse width for mode A and C interrogations?

A

0.8uS

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16
Q

The distance from P1 and P3 in mode A is what?

A

8uS

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17
Q

If the pulses are 21uS apart, what mode is the interrogation in?

A

Mode C

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18
Q

With each transmission, we also send a second omnidirectional signal which equals the size of the ________ sidelobe

A

LARGEST

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19
Q

How long after P1 do we send the P2 pulse?

A

2uS

20
Q

If P2 is large what does that mean and what will happen?

A

We are in a sidelobe and we will suppress (not reply)

21
Q

If we are in a main beam, how large will P2 be?

A

Small

22
Q

Is the side lobe suppression transmitted on the same antenna as the interrogation?

A

No it has its own OMNIDIRECTIONAL antenna

23
Q

Altitude encoding is based on what and what is it set to?

A

Based on BAROMETRIC PRESSURE, set to 29.92Hg

24
Q

What does the REPLY contain?

A

2 framing pulses, 12 pulses (octal) in between and the SPI

25
Q

How far are the framing pulses from each other?

A

20.3uS

26
Q

What is the maximum amount of pulses in a REPLY?

A

15 pulses

27
Q

What is the pulse width of the pulses on a REPLY?

A

0.45uS

28
Q

What is the SPI and what does it do?

A

Special Position Ident, can be activated by pressing the IDENT button. Only when ATC asks you to to SQWUAK IDENT.

29
Q

How long does the SPI stay for?

A

30s

30
Q

How many possible codes are there?

A

4096

31
Q

Why does the transponder not have an AGC?

A

Amplifiers go into saturation, one at a time

32
Q

What is the purpose of the AOC?

A

Feeds into the IF. CONTROLS THE GAIN OF THE VERY FIRST STAGE OF THE IF.

33
Q

How do you trigger the AOC? What is the result of this?

A

When too many replies, greater than 1200. Begins to reduce the IF gain = only strongest signals

34
Q

What is the purpose of a NOISE SUPPRESSION CIRCUIT?

A

Checks to see if pulse is valid or noise. Cuts the first 0.3uS of every pulse.

35
Q

What are the 4 conditions that prevents anything from going into the decoder?

A

Warm up, standby, Side lobe one-shot, reply

36
Q

What is the purpose of the DITCH DIGGER?

A

To see whether or not P2 is large. This sets up the ditch digger depth if P2 is greater than P1.

37
Q

What is the purpose of the one shot?

A

Stretches pulses depending on the transponder. 0.725 into 0.45uS

38
Q

What are the suppressor gates for?

A

Only allows pulses through if we have an appropriate lows on both sides

39
Q

What is the length of the LOW PASS FILTER to the BAND PASS FILTER?

A

1 23/32 inches

40
Q

What is the length of the Tx tube to the low pass filter?

A

11 inches (for duplexer)

41
Q

Where do interrogations come from?

A

Ground and TCAS

42
Q

What is the first thing you should check when troubleshooting a transponder?

A

Check all output voltages make sure they have correct values

43
Q

How long does the REPLY GATE GENERATOR last?

A

35uS

44
Q

What does code 7700 mean?

A

Emergency

45
Q

If there is a COMMUNICATION FAILURE, what code must be inputted?

A

7600

46
Q

If the code reads 7500, what does it mean?

A

Hijacking

Pulse Class (6 decks)

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