VDF/UDF Flashcards
1
Q
How VDF works
A
Multiple antennas on a pole
Picks up a signal at different point - strongest = direction of a/c
ATC get updates every-time they get a signal to find a direction
2
Q
Freq of VHF
A
118MHz to 137MHz
3
Q
UDF/UHF
A
Used by military a/c
4
Q
QDM
A
Magnetic bearing to station
5
Q
QDR
A
Magnetic bearing from a station
6
Q
QUJ
A
True bearing to the station
7
Q
QTE
A
True bearing from the station
8
Q
Wave category
A
Space wave
9
Q
Errors with VHF
A
Interference if 2 stations are broadcasting at the same time
Signals can be bounced of clouds/buildings to give a different direction
10
Q
Class A accuracy VHF
A
Accurate within +- 2*
11
Q
Class B accuracy VHF
A
Accuracy within +- 5*
12
Q
Class C accuracy VHF
A
Accuracy within +- 10*
13
Q
Class D accuracy VHF
A
Accurate to less than class c (+- 10*)
