DESCRIPTION
This 25-day course provides training for
technicians on concepts of VOR/DME
using VOR, Type FA-9996. The course is
70% Academy lecture and 30% Academy
laboratory. Lecture subjects include transmitting
distance and azimuth, microwave
receivers, directional couplers, Class C
amplifiers, RTA-2 antenna and speed
control, AT-100 antenna, AM modulation,
antennas and radiation patterns,
limacon and audio phase concepts, and
error analysis. Laboratory subjects
include introduction to VOR, pulse
train, azimuth test generator, monitor
and control screen introduction,
coder/decoder, space modulation, and
error analysis.
OBJECTIVES
At the conclusion of the course, participants
will be able to:
- Recognize the function of the VOR;
determine how VOR courses are developed;
and predict the phases of the
goniometer outputs with respect to the
transmitter’s instantaneous R-F phase.
- Identify the process of modulation;
identify the various parts of the composite
modulated waveforms; calculate
the modulation factors; analyze the
modulation process by employing R-F
phasing; and identify the voltage components
developed in the de-modulation
process.
- Calculate the average, peak, and effective
powers and modulation, and recognize
the usage of various symbols
used for abbreviations of voltage, current,
power, and resistance.
- Calculate the effective and apparent
space modulation, and determine the
results of quadrature phasing the VOR.
- Distinguish between carrier energy and
double-sideband suppressed carrier
energy, and examine the content of the
inputs and outputs of the solid state
modulator/goniometer.
- Analyze the Alford Loop Antenna, and
analyze the generation and effects of
vertically polarized energy of the VOR
antenna array.
- Analyze the transmission lines, tie-lines,
bridges, L-4 lines, and VOR antennas
for the proper phase relationship; analyze
the VOR radiation pattern using
the rotating limacon and the audio
phase concepts.
- Perform a ground check on a VOR system,
and plot, analyze and evaluate
VOR error curves for Index, Spread,
Duantal Error, Quadrantal Error and
Octantal Error.
WHO SHOULD ATTEND
This course provides training for electronic
technicians and engineers progressing
into technical positions having
responsibility for operating, maintaining,
and certifying/verifying normal operation
of VHF Omnidirectional Range (VOR)
Equipment.
Prerequisites: Basic Electronics
44013, Introduction to Computers
COURSE OUTLINE
- Introduction to VOR
- Amplitude Modulation
- Power in an AM Wave
- Space Modulation
- Sideband Generators
- VOR Radiation Patterns
- Course Error Analysis and Correction
- Azimuth Measuring
- Introduction to Microwave Receiver
- Frequency Conversion
- IF Amplifiers
- Special Receiver Circuits
- Directional Couplers
- Delay Lines
- Class C Amplifiers
- Introduction to Magnetic Amplifiers
- Speed Control
- Rho-Theta Antenna System
- Solid State Antenna
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