VHF DIRECTION FINDER (VDF)

Question 1

An aircraft has to communicate with a VHF station at a range of 300 nm, if the ground station is situated 2,500 ft amsl which of the following is the lowest altitude at which contact is likely to be made?

Answer 1

36,100 ft

Question 2

Class ‘B’ VHF DF bearings are accurate to within:

Answer 2

± 5°

Question 3

A VDF QDM given without an accuracy classification may be assumed to be accurate to within:

Answer 3

5 degrees

Question 4

An aircraft at altitude 9,000 ft wishes to communicate with a VHF/DF station that is situated at 400 ft amsl. What is the maximum range at which contact is likely to be made ?

Answer 4

143 nm

Question 5

An aircraft is passed a true bearing from a VDF station of 353°. If variation is 8°E and the bearing is classified as ‘B’ then the:

Answer 5

QTE is 353° ± 5°

Question 6

An aircraft at 19,000ft wishes to communicate with a VDF station at 1,400ft amsl. What is the maximum range at which contact is likely ?

Answer 6

219 nm