1977-09-08
1979-06-19
Bookbinder, Marc E.
325380, 325381, 325384, 325413, H04B 110, H04B 118
Patent
active
041588142
ABSTRACT:
A variable impedance circuit is included between the antenna and the RF amplifier stage of a radio receiver portion of a transceiver and is responsive to a phase-inverted and amplified AGC signal to automatically protect the receiver from breaking down or otherwise malfunctioning when it receives an over-input or excessive input signal level. When the input signal level to the receiver is at the typical operating level, the circuit provides a substantially infinite impedance to ground so as not to interfere with signal transmission from the antenna to the input stage and the successive stages. The impedance to ground of the circuit decreases as the input signal level increases and, when an excessive input signal level sufficient to cause receiver breakdown or malfunction is applied to the circuit, the impedance to ground of the variable impedance reaches an almost zero level, thereby shunting to ground and thus harmlessly dissipating the excessive signal level input to the receiver before it can burn out or otherwise damage the input or subsequent circuitry or cause a malfunction thereof.
REFERENCES:
patent: 3255415 (1966-06-01), Baur
patent: 3581210 (1971-05-01), Amfahr
patent: 3600684 (1971-08-01), Cherry
patent: 3622887 (1971-11-01), Byles
Imazeki Kazuyoshi
Kazami Koichi
Bookbinder Marc E.
General Research of Electronics Inc.
LandOfFree
Automatic overload protection system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automatic overload protection system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic overload protection system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-57681