Pulse interference blanking circuit for radio receivers

Details Pulse interference blanking circuit for radio receivers Pulse interference blanking circuit for radio receivers

1975-07-25

1977-02-01

Richardson, Robert L.

325478, H04B 110

Patent

active

040064190

ABSTRACT:
After a preliminary differentiation, the demodulated signal is supplied in parallel to a peak rectifier and to a second differentiating network, the outputs of the latter two circuits being added in the input circuit of a switching transistor that controls the blanking gate of a receiver. The value of the resistor across the output capacitor of the peak rectifier, as well as the rectifier capacitor, is so chosen in value that periodically recurrent pulses that may be persistently present in the signal build up a blocking bias on the switching transistor reducing its sensitivity and preventing corresponding differentiated pulses from switching it on, whereas occasionally or irregularly appearing pulses develop a negligible bias through the rectifier, so that their twice differentiated derived pulses will switch on the transistor and produce blanking.

REFERENCES:
patent: 3284714 (1966-11-01), Battin et al.
patent: 3390339 (1968-06-01), Kamerer et al.
patent: 3699457 (1971-08-01), Wright

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