Chapter 2 - VHF Direction Finding

Question 1

Give the frequency range for VHF direction finding

Answer 1

118.000 - 136.975 MHz

Question 2

Give the different bearings that a DF station can provide using the following codes
QDM
QDR
QUJ
QTE

Answer 2

QDM - Magnetic to the station
QDR - Magnetic from the station
QUJ - True to the station
QTE - True from the station

Question 3

Give the formula for a space wave range

Answer 3

Range (Nm) = 1.23 x Root Height + Root Height of A/C

Question 4

Give the accuracy for VDF Class A,B,C and D

Answer 4

A + or - 2 degrees
B + or - 5 degrees
C + or - 10 degrees
D More than 10 degrees