Quantcast Figure 1-11. Cardioid Pattern Resulting From Inner Parasitic Element

 

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INSTRUMENT FLIGHT RULES WORKBOOK
CHAPTER ONE
Wires
On Outer
Rotating
Cylinder
Wire On Inner
Stationary
Rotating
Central
Cylinder
Element
Reference
Pulse Disk
Drive Shaft
Figure 1-10 TACAN Ground Beacon Antenna Design (Azimuth)
Magnetic North
Fixed Center
Element
E
W
Inner Parasitic
Element
Coarse Pattern
S
Figure 1-11 Cardioid Pattern Resulting From Inner Parasitic Element
3.  Determination for bearing. To determine the aircraft's bearing from the station, a phase
angle must be electronically measured. To measure the phase angle, a fixed reference is
established. This fixed reference is a 15-pulse-per-second nondirectional signal normally
referred to as the main reference bearing pulse. One main reference pulse occurs with each
revolution of the antenna when the peak of the cardioid is at a magnetic direction of 090. In
addition to the main reference pulse, eight auxiliary reference pulses also occur during one
revolution of the ground beacon antenna. Therefore, a reference pulse occurs each 40 of
INTRODUCTION TO AIRBORNE NAVIGATION AND COMMUNICATIONS
EQUIPMENT AND PRINCIPLES OF OPERATION 1-15


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