## Electronics (Mike Jaroch)

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### R

#### RANGE MARKER

A movable vertical pulse on an A-scope or a ring on a PPI scope used to measure the range of an echo or to calibrate the range scale [18].

 Keyword(s): RANGE MARKER

#### RANGE RESOLUTION

Ability of a radar to distinguish between targets that are close together [18].
 Keyword(s): RANGE RESOLUTION

#### RANGE STEP

On an A-scope sweep, a vertical displacement used to measure the range of an echo [18].
 Keyword(s): RANGE STEP

#### RANGE-GATE

A movable gate used to select radar echoes from a very short range interval [18].
 Keyword(s): RANGE-GATE

#### RANGE-HEIGHT INDICATOR

A radar display on which slant range is shown along the X axis and height along the Y axis [18].

 Keyword(s): RANGE-HEIGHT INDICATOR

#### RANGES

The several upper limits a meter will measure as selectable by a switch or by jacks; for example, a voltmeter may have ranges of 1 volt, 2.5 volts, 10 volts, 25 volts, and 100 volts [3].

 Keyword(s): RANGES

#### RAREFIED WAVE

A longitudinal wave that has been expanded or rarefied (made less dense) as it
moves away from the source [10].

 Keyword(s): RAREFIED WAVE

#### RATE GYRO

A gyro used to detect and measure angular rates of change [15].
 Keyword(s): RATE GYRO

#### RATIO

The value obtained when one number is divided by another. This value indicates the relative proportions of the two numbers [2].

 Keyword(s): RATIO

#### RATIO DETECTOR

A detector that uses a double-tuned transformer to convert the instantaneous
frequency variations of the FM input signal to instantaneous amplitude variations [12].

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