crystal video receiver


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crystal video receiver

[¦krist·əl ¦vid·ē·ō ri′sē·vər]
(electronics)
A broad-tuning radar or other microwave receiver consisting only of a crystal detector and a video or audio amplifier.
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The output of the crystal video receiver is a series of pulses with amplitude proportional to the received signal power of each received RF pulse, and with the same start and stop times.
For a modern crystal video receiver in a typical configuration, with an automatically processed output, the ultimate sensitivity is improved to the -65 to -70 range by preamplification.
A preamplified IFM receiver has approximately the same sensitivity but somewhat less dynamic range than a crystal video receiver. The switchable attenuator in Figure 2 extends its dynamic range to the equivalent of that of the crystal video receiver.
(In other types of receivers, the detection happens at about 10 mW, allowing the detector to operate in the "linear" region.) In his classic 1956 paper on crystal video receivers, Dr.
Wide-band crystal video receivers are simple, inexpensive and offer a high probability of intercept (POI) within their frequency range.
Crystal video receivers are simple and inexpensive and offer a high probability of intercept (POI) within their frequency ranges.
In all cases, channelized receivers are more complex than single superheterodyne receivers, instantaneous frequency measurement receivers or crystal video receivers. There are also differing levels of complexity associated with the above channelized receivers.