8-D-33: Variable Range Markers
8-33D1:
The variable range marker signal is normally fed to the input of the:
Video amplifier.
Sweep amplifier.
Low voltage power supply regulator.
Range ring oscillator.
8-33D2:
The purpose of the variable range marker is to:
Provide an accurate means of determining the range of a moving target.
Provide a bearing line between own ship and a moving target.
Indicate the distance between two different targets.
Provide a means of calibrating the fixed range rings.
8-33D3:
How is the variable range marker usually adjusted for accuracy?
The minimum and maximum ranges are aligned with the matching fixed range ring.
Adjusting the frequency of the VRM oscillator at the maximum range.
Adjusting the frequency of the VRM oscillator at the minimum range.
Adjusting the readout to match at the median range ring.
8-33D4:
The panel control for the variable range marker is normally a:
Variable resistor.
Variable inductance.
Variable capacitance.
Variable resolver.
8-33D5:
An important component of the VRM system is the:
Shift register.
Resolver.
Interference rejection circuit.
STC sensitivity control.
8-33D6:
Which of the following statements about the Variable Range Marker system is correct?
The VRM system develops a single adjustable range ring.
The VRM is an auxiliary output of the fixed range marker oscillator.
The VRM system is calibrated using a frequency counter.
The VRM system is controlled by a crystal oscillator.
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● = Learned
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● = Incorrect answer
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