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Final_Avionics > Part 2 VOR ADF > Flashcards

Part 2 VOR ADF Flashcards

1
Q

VOR

A

Very High Frequency Omni Range

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2
Q

What is a VOR

A

A enroute, station-to-station Radio Navigation System

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3
Q

What does a VOR provide

A

magnetic Heading and Bearing information, Aircraft location around the VOR station

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4
Q

What does a VOR assist in providing

A

Position FIx

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5
Q

What can a VOR be co-located with

A

DME or TACAN ground stations

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6
Q

Radials are identifies by

A

0-360 degrees

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7
Q

VOR test station

A

non-rotating, very low power transmitter

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8
Q

VOR transmits what

A

FM and AM in phase

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9
Q

VOR modulation and how do they compare

A

30 HZ Fm reference signal
30 HZ AM variale signal
Compares the PHASE difference between the two signals

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10
Q

Components of a VOR system

A 
Antenna
Receiver
Control Head
Indication 
Interconnecting wiring and antenna coaxial cable
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11
Q

NAV receiver is located

A

in the radio rack or avionics bay

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12
Q

Frequency selector

A

mounted on the glare-shield

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13
Q

VOR can be displayed on

A

a variety of different instruments

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14
Q

Manual VOR indications are displayed on

A

CDI

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15
Q

HSI DOR deviation represents

A

5 degrees

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16
Q

Automatic VOR indications are displayed on

A

Compass Instruments

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17
Q

To/From indication

A

tells you what the aircraft would do , if you were to turn onto the selected course heading

18
Q

VOR system operates in the

A

VHF frequency band from 108.0 - 117.95 MHz

NON LOCALIZER FREQUENCIES

19
Q

A 30 HZ, FM “Sub carrier” is transmitted omnidirectional at

A

9960HZ + / - 480 HZ

20
Q

The “sub carrier” is applied as

A

AM to the RF

21
Q

The RF carrier wave is electronically rotated during transmission at a speed of

A

1800 RPM

22
Q

The FM reference signal is synchronized with

A

Rotating directional (AM) signal

23
Q

The FM Reference will always be at its positive peak when the directional (AM) signal is pointed

A

North VOR receivers will detect the AM signal’s positive peak, when the directional signal is pointed at the aircraft

24
Q

ADF

A

Automatic Direction Finders

25
Q

Purpose of ADF

A

Station to station Navigation
Radio navigation system
needle points towards ADF ground station
Ground stations are called non directional beacons

26
Q

ADF frequencies

A

horizontally polarized 200-2000KHZ

27
Q

ADF components

A

Receiver
Control Head
Indicator

28
Q

Antennas used for ADF

A 
Loop antenna (box)
Sense Antenna (wire)
Both may be combines into one unit
29
Q

ANT

A

ANT mode parks at the 3 o’clock position The loop antenna is disables and all receiving is done through the sense antenna This mode provides the best audio reception

30
Q

ADF mode

A

pointer is activated, wants to point to the station

31
Q

BFO

A

Best frequency oscillator. generates audio tone when there is none

32
Q

ADF loop

A

senses direction of radio station by seeking null position

33
Q

2 Nulls degrees apart

A

180

34
Q

what antenna gives you direction

A

loop and sense

35
Q

Problems with ADF

A

coastal effect
night effect
quadrantal error
“P” static

36
Q

Night effect

A

ADF uses a ground wave which follows the contour of the earth - Portion of the signal acts as a skywave - reflected off the ionosphere back to earth

37
Q

Coastal effect - when the ground wave from the ADF transmitter reaches a coastline what happens

A

it will change direction slightly

38
Q

“P” static interference

A

ADF is prone to noise interference

39
Q

Quadrantal error

A

Electromagnetic fields around the 4 quadrants of the airframe can cause errors being introduced into the ADF system

40
Q

How can quadrantal error be minimized

A

Quadrantal Error corrector

Final_Avionics (3 decks)

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