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Pulse Class > Mode S Transponder > Flashcards

Mode S Transponder Flashcards

1
Q

What does the PRIMARY radar give us?

A

Range and Position/ Bearing and Distance

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2
Q

What is the main reason for Mode S?

A

Collision Avoidance and Synchronous Garble

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3
Q

What additional info does Mode S give us?

A

Aircraft Identity, ATC instructions, Traffic Info Service, Weather info

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4
Q

What is the major improvement of Mode S?

A

Interrogate a single aircraft at a time

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5
Q

What is Mode S?

A

Discrete Selective Interrogation

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6
Q

When a mode S transponder is being interrogated with an address that is not its own unique code, what happens?

A

They ignore the interrogation, reduces channel congestion

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7
Q

Does the mode S have an AOC?

A

No it does not because AOC is involved when an aircraft is replying 1200pps or more.

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8
Q

What is the ADS-B?

A

Automatic Dependent Surveillance Broadcast (gives a lot of information)

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9
Q

The mode S includes what?

A

Call sign/24bit ICAO address in the form of a hex code (broadcast on squitter)

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10
Q

During a mode S ATCRBS ALL CALL how long should P4 be and who replies?

A

1.6uS

Everyone replies, ATCRBS aircraft with mode A or C, mode S with their 24bit address

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11
Q

What does the DF11 squitter give ATC?

A

Gives ATC the address for all the aircrafts in the zone

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12
Q

What is the purpose of the ALL CALL?

A

To get the bearing and distance of an aircraft using the PSR in combination with the SSR to give aircraft ID

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13
Q

In a mode S Discrete ALL CALL who replies?

A

One specific aircraft using the correct address

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14
Q

How many bits is a short surveillance interrogation?

A

56bits

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15
Q

How many bits is a comm-A long interrogation?

A

112bits

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16
Q

How many bits is a comm-C long interrogation?

A

1280bits (16x112bits)

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17
Q

The first 5 bits tells us what?

A

The type of interrogation/format

18
Q

How many bits is the address and parity?

A

Last 24bits

19
Q

DF17, 18, and 19 are all what?

A

Squitters

20
Q

Which DF is EXTENDED SQUITTER?

A

DF17 (10001)

21
Q

If P4 is only 0.8uS, what type of interrogation is it and who replies?

A

It would be during an ATCRBS ALL CALL, modes A and C will reply, mode S will not

22
Q

What pulses are sent during a mode S interrogation format?

A

P1, P2, P6 at 1030MHz

23
Q

In mode S which pulse acts as the side lobe suppression?

A

P5

24
Q

What is the distance between P1 and P5?

A

4.5uS

25
Q

What is DPSK?

A

Differential Phase Shift Keying, a specific modulation used for the interrogation

26
Q

How long is P6?

A

16.25uS or 30.25uS

27
Q

How long is each chip?

A

0.25uS

28
Q

When you want to change the 0.25uS chips from LO to HI what do you do?

A

Change the phase of the 1030MHz by 0.25uS

29
Q

The Sync Phase Reversal Pulse is superimposed with what?

A

P5

30
Q

What pulse is mandatory in order to go through to the decoder?

A

Sync Phase Reversal Pulse

31
Q

If we are in a side lobe how big is P5?

A

P5 is as big or covers the sync phase reversal pulse, hence we are in a side lobe therefore we will not be decoding

32
Q

How long is the PREABMLE and what does it contain?

A

3.5uS and contains P1 and P2

33
Q

How long from P6 to the Sync Phase Reversal Pulse?

A

1.25uS

34
Q

How long from the Sync Phase Reversal Pulse to the beginning of the data?

A

0.5uS

35
Q

In a MODE S reply, what are the pulse widths?

A

0.5uS

36
Q

How long is the REPLY PREAMBLE?

A

8uS

37
Q

After the reply preamble what are we getting?

A

56 or 112 PPM pulse pairs

38
Q

How long is each bit?

A

1uS (early 0, late 1)

39
Q

What is the total reply length for a mode S reply?

A

Short is 64uS (8uS + 56uS)

Long is 120uS (112+8)

40
Q

When clicking the VFR button, what channel does it auto set the transponder to?

A

1200

Pulse Class (6 decks)

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