Radio receiver blanker gate

Details Radio receiver blanker gate Radio receiver blanker gate

H - Electricity

04

B

325/126

H04B 1/26 (2006.01) H03G 3/34 (2006.01)

Patent

CA 1080808

RADIO RECEIVER BLANKER GATE ABSTRACT A balanced, doubly tuned gate couples between the mixer and intermediate frequency (IF) stages of a conventional radio receiver. The network is comprised of a pair of matched transformers interconnected in a balanced configu- ration, with the first transformer tuned to the mixer and the remaining transformer tuned to the IF stage. Capacitors interconnect the two transformers resulting in a Butterworth filter network. Two diode pairs connect in shunt across selected wind ings of the transformers. Direct current bias normally biases the diodes to a nonconducting state, thereby allowing the mixer signals to pass to the IF stage. A blanking signal from the receiver blanker drives the diodes to conduc- tion thereby decoupling the mixer from the IF and blanking the receiver. Due to the doubly balanced nature of the gate, blanking is accomplished with a minimum of switching time. Moreover, the shunt diode switching scheme provides superior attenua- tion in the blanking mode and enhanced operation in the normal mode.

272182

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