VHF Flashcards
What is the frequency range for VHF
108- 117.95 MHz
What is the frequency range for a terminal VOR
108-111.95 MHz
What is the frequency range for a en route VOR
112 - 117.95 MHz
Where is variation applied for VHF
At the beacon
What is a CVOR
Conventional VOR
variable phase is amplitude modulated
Signal strongest when a/c is pointing directly at beacon
= when antenna is pointing towards a/c
What is DVOR
More accurate than CVOR
less susceptible to site errors
Better for use in confined areas
Variable phase is frequency modulated
What concept for VOR work on
Phase comparison
What is the VOR self checking for
Beating indie remains +- 1°
Signal strength has not dropped more than 15%
If any conditions haven’t been met then VOR stops ident and shuts down
What is the VOR cone of confusion
No less than 40° from the horizontal
What are the 3 operational types of VOR
En route VOR
Terminal VOR (TVOR)
Rest VOR (VOT)
If on test will see TST instead of ident
Can’t use while on test
VOR can transmit ATIS
What aircraft equipment is required for a VOR
Antenna
VOR receiver / control unit
Indicator system;
- RMI = radio magnetic indicator (similar to ADF
- OMI = monk bearing indicator
- HSI = horizontal situation indicator
On a OBI what does 1 dash represent
2° deviation from the selected radial
What is the equation to find the range of the VOR
1.23 x ((squareroot a/c height)+(VOR height))
Range is proportional to power of transmitted signal
What is the accuracy required of a VOR
+/- 5°
This is made up of
+/- 1 ° transmitter error
+/- 1° propagation error
+/- 3° airborne equipment error
What is the accuracy you must fly within for a VOR
+/- 5° of radial
Half scale deflection
