AIM 1-1-16

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1-1-16. VHF Direction Finder

a. The VHF Direction Finder (VHF/DF) is one of the common systems that helps pilots without their being aware of its operation. It is a ground-based radio receiver used by the operator of the ground station. FAA facilities that provide VHF/DF service are identified in the A/FD.

b. The equipment consists of a directional antenna system and a VHF radio receiver.

c. The VHF/DF receiver display indicates the magnetic direction of the aircraft from the ground station each time the aircraft transmits.

d. DF equipment is of particular value in locating lost aircraft and in helping to identify aircraft on radar.

REFERENCE- AIM, Direction Finding Instrument Approach Procedure, Paragraph 6-2-3.

Aeronautical Information Manual (AIM) — Chapter 1
1-1-1 - 1-1-2 - 1-1-3 - 1-1-4 - 1-1-5 - 1-1-6 - 1-1-7 - 1-1-8 - 1-1-9 - 1-1-10 - 1-1-11 - 1-1-12 - 1-1-13 - 1-1-14 - 1-1-15 - 1-1-16 - 1-1-17 - 1-1-18 - 1-1-19 - 1-1-20 - 1-1-21 - 1-1-22
1-2-1 - 1-2-2 - 1-2-3