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Pulse Class > DME > Flashcards

DME Flashcards

1
Q

How does the DME measure distance?

A

Uses time

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2
Q

What does DME provide?

A

Slant Range (distance), Ground Speed(KTS), Time to Station

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3
Q

Who is interrogating the DME?

A

The Aircraft is interrogating, and the DME is replying

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4
Q

How long does it take for 1NM?

A

12.36uS round trip (6.18uS one way)

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5
Q

Why are the DME pulses a trapezoidal shape?

A

For better propagation of the ANT. The better the propagation, the greater than range with low power.

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6
Q

How many miles is the DME good for?

A

100-200miles

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7
Q

How large are the pulses of a DME?

A

3.5uS

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8
Q

What is the pulse spacing for an X channel?

A

12uS(aircraft)

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9
Q

If the pulse spacing is 36uS(aircraft), what channel are we in?

A

Y channel

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10
Q

How many DME channels are there?

A

200 (100X and 100Y)

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11
Q

What is the Tx range?

A

1041MHz - 1150MHz

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12
Q

What is the Rx range?

A

978MHz-1213MHz

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13
Q

How do you know if the frequency is on an X or a Y channel?

A

X ends in a 00

Y ends in a .05

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14
Q

How many MHz is the change from Tx to Rx?

A

63MHz

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15
Q

What is the spacing on a Y channel Rx?

A

30uS(ground)

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16
Q

How long is the ground station delay and what is it for?

A

50uS used for nearby navigation to give time to decode and reply

17
Q

What are squitter pulses and how many pp/s does it send out?

A

To make standby DMEs go back to working, sends out 2700pp/s. The closer the aircraft, squitter turns to reply

18
Q

What is the PRF for search mode?

A

100pp/s

19
Q

What is the PRF in track mode?

A

25pp/s

20
Q

How many aircrafts can the DME ground station handle?

A

100 aircrafts

21
Q

What is a JITTER rate?

A

Unique PP (gap/timing is different for each aircraft). Uses noise. Picks out its specific replies.

22
Q

What are the frequency increments?

A

1MHz steps

23
Q

What is a quick way to test the sensitivity of the DME?

A

Turn on audio, adjust the attenuator until morse is just barely heard, turn off audio, then will automatically lock on

24
Q

What is the DME Audio ID?

A

Ground stations sends out a 3 letter morse code every 30s. During those 30s no replies(no lock on).

25
Q

What is the PRF of the Audio ID?

A

1350pp/s, all equal.

26
Q

The DME sensitivity is also know as?

A

Acquisition Sensitivity

27
Q

When testing receiver sensitivity what dBm should we be looking for?

A

-82dBm

28
Q

When more than 100 interrogations are being sent to the DME, what happens to the AOC?

A

The ground station will reduce its sensitivity

29
Q

What is the aircraft DME Memory mode?

A

The DME continues tracking for 10-15s to prevent it from going back into search mode`

30
Q

When you click Hold mode, what happens?

A

You can select a new VOR/LOC frequency while still tracking the old one

Pulse Class (6 decks)

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