Patent ID: 8619838

Claim:
A bi-directional repeater for transmission line based electric fences comprising: a. a forward amplifier with differential input and output, for amplifying forward signal; b. a backward amplifier with differential input and output, for amplifying backward signal; c. a monostable circuit that is triggered by the output of said forward amplifier and outputs an electric pulse with a predetermined pulse width; d. a quad pole double throw signal switch that connects the transmission line wire pair to the forward amplifier in normal state, and to said backward amplifier when triggered by said output electric pulse of said forward amplifier; e. said output pulse of said monostable circuit operates said quad pole double throw signal switch such that said quad pole double throw signal switch connects said transmission line to said backward amplifier for a time period equal to said predetermined pulse width; f. after said time period equal to said predetermined pulse width, said quad pole double throw signal switch reconnects said transmission line wire pair to said forward amplifier, waiting for next short pulse to come.