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Pulse Class > CARS Transponder Requirements > Flashcards

CARS Transponder Requirements Flashcards

1
Q

How often do you check Transponders?

A

Bi-annually

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2
Q

What is the rate of interrogation of any test equipment?

A

PRF of 235pp/s

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3
Q

For older transponders, what is the reply frequency and its tolerance?

A

1090MHz +-3MHz

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4
Q

For newer transponders with mode S, what is the reply frequency?

A

1090MHz +-1MHz

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5
Q

When testing suppression if you are getting a reply of 1% and below, how large is P2 in comparison to P1?

A

P2 is equal to P1

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6
Q

When testing suppression and P2 is 9dB less than P1 explain what happens.

A

Transponder is replying to at least 90% of interrogations

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7
Q

When testing Rx Sensitivity, for any class, what is the MTL?

A

-73+-4dBm (old)

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8
Q

For newer transponders with mode S, what is the MTL?

A

-74+-3dBm (new)

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9
Q

What is the peak power output at the ANT for class A?

A

125 Watts (21dBW)

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10
Q

What is the peak power output at the ANT for class B?

A

70Watts (18.5dBW)

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11
Q

What is the peak power output coming out at the bench?

A

200-250Watts

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12
Q

For any class, what is maximum peak power output that must not be exceeded?

A

500Watts

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13
Q

Describe the Mode S DIVERSITY test

A

To make sure there’s isolation between the top ANT and bottom. Selected ANT must have a peak power output of greater than 20dB.

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14
Q

Describe mode S Address test

A

Make sure it replies only to its assigned address. Use 1 correct and 2 incorrect addresses. 50 interrogations /s.

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15
Q

In the mode S transponder with uplink format, when you select UF4 what are you verifying?

A

Altitude reply same as ATCRBS mode C

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16
Q

If we are verifying the identity same as on a ATCRBS mode A which UF are we in?

A

UF 5

17
Q

During a mode S All Call Interrogation which UF are we in and how long is the P4 pulse?

A

UF11 and P4 should be 1.6uS

18
Q

During an ATCRBS only All Call Interrogation, if P4 is only 0.8uS who will reply?

A

Only aircrafts with mode A and C, mode S will not reply

Pulse Class (6 decks)

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