mechanical scanning

mechanical scanning

noun
1.
Electronics. a technique for varying the sector covered by a transmitting or receiving antenna by rotating it.
2.
Television. a technique, formerly used in televising, for scanning by means of a scanning disk.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Mechanical scanning is always a great word to know.
So is alternating voltage. Does it mean:
unit of electrical resistance
voltage that reverses direction in regular cycles
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