02 VDF (VHF Directional Finding)

Question 1

What frequency range does VDF operate in?

Answer 1

118 MHz to 137 MHz

Question 2

What are the different bearings provided by a ground DF station?

Answer 2

• QDM: Magnetic bearing to station
• QDR: Magnetic bearing from station
• QUJ: True bearing to station
• QTE: True bearing from station
• QDL: Receive steering instructions
• QGH: DF controlled approach

Question 3

What are the ICAO classifications of accuracy for DF bearings?

Answer 3

• Class A: +- 2 degrees
• Class B: +- 5 degrees
• Class C: +- 10 degrees
• Class D: Less accurate than class C