The VOR (15-05-18) Flashcards
What does VOR stand for?
VHR Omni-directional Range
What frequency range does VOR operate on?
108 - 118MHz
What frequency band does an ILS locator operate on?
108.1 - 111.95MHz
How do you differentiate between ILS locator frequency bands and VOR frequency bands between 108 - 112MHz?
if the first digit after the decimal is ODD then the frequency band is for ILS.
What can the combination of a VOR and a DME give you?
A bearing and range fix
What are the properties of the reference phase of a VOR?
FM and 30MHz
omnidirectional polar diagram
What are the properties of the variphase of a VOR?
AM at 30MHz
Rotating limacon polar diagram
rotates clockwise when seen from above.
What is the principle of operation of a VOR?
Magnetic bearing by phase comparison producing a radial.
Variation is applied at the VOR
P prop R^2
What are the different types of VOR?
Conventional VOR (CVOR)
Broadcast VOR (BVOR)
Doppler VOR (DVOR)
Terminal VOR (TVOR)
Test VOR (VOT)
Tactical air navigation VOR (VORTAC)
What is the major problem with CVOR and how can it be fixed?
Siting error (multipath error) leading to the need for it to be fixed on flat open terrain.
The cure for this is the DVOR
What is the difference in principle operation between a CVOR and a DVOR?
For DVOR there is no turning piece so the phase difference is created electronically and turns anticlockwise when viewed from above
What are the properties of the Omni Bearing Indicator (OBI)?
Full scale deflection in VOR mode is 10deg(or more)
2 deg per dot in a 5 dot system
5 deg per dot in 2 dot system
THEY HAVE NO KNOWLEDGE OF HEADING
The TO/FROM flag will flip when flying overhead.
What is the 1/60 rule?
RA = 60D
R is adjacent
A is angle between adjacent and hypotenuse
D is opposite
What are the properties of a Radio Magnetic Indicator (RMI)?
Compass card rotates
Can show both VOR and ADF
Head shows QDM
Tail shows QDR
Heading is always at the top
What are the properties of a Horizontal Situation Indicator (HSI)?
Heading is taken into account
The TO/FROM flag does not take the heading into account.
What are the dimensions of the cone of confusion for a VOR?
50deg
When does the TO/FROM flag flip with a VOR?
When you exit the cone of confusion
What are the effects of deviation on VOR?
It does not affect it as it provides a mag bearing
When an RMI compass card is stuck, how will displayed sense and QDM be affected for ADFs and VORs?
ADF will show correct sense but wrong QDM
VOR will show correct QDM but incorrect sense
What errors are associated with a VORs?
Propagation error
Multipath error
Station interference
Super refraction
Sub refraction
Sporadic E
What is max theoretical range for a VOR?
MTR = 1.23 x (root(HtTx) + root(HtRx))
in nm
What is the accuracy of the VOR system as a whole and its sub parts?
Ground equipment: +/- 1deg
Airborne equipment: +/- 3deg
Unknown withing DOC +/- 1deg
Total system error +/- 5deg
When will the ground equipment monitoring system transfer automaticaly from the master to stand by beacon?
When there is a change of bearing in excess of 1 deg at station
When there is a reduction in either or both of the reference and directional signal by more than 15% or carrier wave by more than 15%
When the monitor itself fails.
What is the Designated Operational Coverage (DOC)?
Essentially promulgated range but for a VOR
is valid for both day and night
can be sectorised.
