VDF

Question 1

VDF Finding is based on what frequency

Answer 1

Very High Frequency
Ultra High Frequency

Space waves mode of propagation (limited to line of site)

Question 2

Direction Finding Equipment needed in aircraft

Answer 2

No special equipment other than radio
VHF COMM transceiver

Question 3

How VDF works

Answer 3

VHF signal sent in all direction from aircraft
Received by antenna aerial
Each aerial at different angle/distance so detect different phase of signal
Phase used to determine bearing

Question 4

QGH

Answer 4

VDF Let down
ATC guidance overhead and inbound to runway

Question 5

QDM

Answer 5

AC to the station
Magnetic

Question 6

QDR

Answer 6

Station to the AC
Magnetic

Question 7

QUJ

Answer 7

AC to the station
True heading

Question 8

QTE

Answer 8

Station to the aircraft
True heading

Question 9

Class A accuracy

Answer 9

+- 2 degrees

Question 10

Class B Accuracy

Answer 10

+- 5 degrees

Question 11

Class C Accuracy

Answer 11

+- 10 degrees

Question 12

Class D Accuracy

Answer 12

Less than class C

Question 13

What is the effect of multi path signals at the ground VHF direction finder station

Answer 13

Result in bearing errors

Question 14

Which frequency bands does a locator normally transmit

Answer 14

LF/MF (NDB)

Question 15

VDF Frequency Band

Answer 15

118MHz to 137 MHz civil AC comms