Quantcast Figure 1-17. TACAN Azimuth Cone of Confusion

 

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INSTRUMENT FLIGHT RULES WORKBOOK
CHAPTER ONE
CONE
OF
CONFUSION
AS GREAT AS
100
Figure 1-17 TACAN Azimuth Cone of Confusion
3.
Range indicator fluctuations. Slight oscillations up to approximately NM are normal for
range indicator operation. When a usable signal is lost, the memory circuit maintains the
indicated range for about 10 seconds. If the signal is regained during this period, the indicator
will "jump" to the correct reading.
4.  Erroneous TACAN indications. Several forms of malfunction of airborne equipment or
interference between ground stations can give false or erroneous TACAN navigational
information to an aviator. These discrepancies are easier to recognize and guard against if the
aviator is aware they can occur. The more common erroneous indications are:
a.
A 40 azimuth error lock-on/lock-off. The construction of the TACAN ground
antenna is such that it transmits a series of nine signal lobes (eight auxiliary and one
main reference pulse) 40 apart. With the airborne receiver working correctly, the
main reference pulse (which occurs when the peak of the rotating cardioid pattern is
at the 090 magnetic direction) locks on at the 090 slot of the receiver. With a weak
airborne receiver, the reference pulse may "slide over" or miss the 090 slot and lock
on at one of the auxiliary positions. When this occurs, azimuth indications will be 40
or some multiple of 40 in error. Rechanneling (retuning) the airborne receiver to
deliberately cause unlock may cause the receiver to lock on properly. When other
bearing information such as VOR or ADF is available, it should be used to verify the
position periodically. This type error is unusual, but possible in present day TACAN
sets.
b.
Co-channel interference. Co-channel interference occurs when a aircraft is in a
position to receive TACAN signals from more than one ground station on the same
frequency. Normally this occurs only at very high altitudes when distance separation
INTRODUCTION TO AIRBORNE NAVIGATION AND COMMUNICATIONS
EQUIPMENT AND PRINCIPLES OF OPERATION 1-21


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