CW and pulse capable crystal video receiver
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United States of America Patent
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-
Feb 21, 1989
Grant Date -
N/A
app pub date -
Aug 22, 1986
filing date -
Aug 22, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A crystal video receiver having CW and pulse detection capability includes a threshold signal generator which switchably provides fixed and noise riding threshold signals, used to determine initial signal detection. Track and hold circuits provide a second threshold, derived from the peak received signal level, for establishing the termination of received video pulses. A pulse width counter is coupled to determine the time a received pulse signal is between the two thresholds and is set to overflow at a predetermined time after the reception of a signal to establish a pulse representative of a received CW signal and to prevent receiver lock up.
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