CW and pulse capable crystal video receiver

Details CW and pulse capable crystal video receiver CW and pulse capable crystal video receiver

1986-08-22

1989-02-21

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Return signal controls radar system

Receiver

342 93, G01S 1300

Patent

active

048069337

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.

REFERENCES:
patent: 3573820 (1971-04-01), Bohacek
patent: 3617998 (1971-11-01), Freedman
patent: 4194206 (1980-03-01), Tsui et al.
patent: 4274095 (1981-06-01), Phipps et al.

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