VOR Flashcards
VHF freq range
108.00 - 117.95MHz
Terminal VOR freq range
108.00 - 111.95MHz
En route VOR freq range
112.00 - 117.95MHz
Radials
Bearings from the beacon
As they are magnetic radials, variation is applied at the beacon
All radials are magnetic
CVOR
Conventional VOR
Reference phase is freq modulated and the variable phase is amp modulated
Signal is strongest when it is pointing at the a/c
DVOR
Doppler VOR
Freq modulated in the variable phase and amp in the reference phase
Instrument always reads a strong signal
More accurate
Needs less space, good for confined areas
VOR freq separation
0.05 MHz between them
VOR self checks
Consists of a pick up Ariel on a given radial, it will sense any drifting
Checks the bearing information is within -+ 1*
Signal strength is less or more than 15%
VOR cone of confusion
ICAO requires the cone to be a min of 40* from the horizontal
No less than 40*
Different operational types of VOR
Enroute VOR
Terminal VOR (TVOR)
Test (VOT)
OBI/CDI
Course deviation indicator/ omni-bearing indicator
Selected bearing/course at the top if the instrument
2* deviation scale
HSI
OVI put on a compass card that moves with the a/c magnetic heading
Gives you an indication horizontally in relation to the a/c’s heading
Yellow arrow points to the bearing
Freq band and type of wave of a VOR
High freq
Space wave
To find out range for a VOR
Line of sight equation
D=1.23x(Rx+Tx)
Accuracy of a VOR
+- 5*
Made up of
1*+- of transmitter error (site error)
- +1* of propagation error (disturbance of the signal while it travels)
- +3* of airborne equipment error
