Abstract: An electrostatic overvoltage protection device for use in remotely mountable weatherproof bi-directional, half-duplex switching amplifier system designed to provide maximum range for low power half-duplex radios such as Spread Spectrum radio transceivers in which a conductor is connected between the signal input and a source of reference potential having a length selected to be one quarter of the wavelength of a preselected desired signal band frequency and is one of a trace on a circuit board and wire.

Abstract: A mounting arrangement for an external connection to an electrical circuit of use in a remotely mountable weatherproof bi-directional, half-duplex switching amplifier system is designed to provide maximum range for low power half-duplex radios such as Spread Spectrum radio transceivers in which a coaxial connector protrudes through the wall of a housing and is in an abutting relationship with a circuit board on which an electrical circuit is mounted.

Abstract: A waterpoof housing arrangement for use with a remotely mountable bi-directional, half-duplex switching amplifier system is designed to provide maximum range for low power half-duplex radios such as Spread Spectrum radio transceivers in which the side of the housing that is not constructed to be waterproof is mounted in a downward position and constructed so that all electrical connections are accomplished through the downward facing side of the housing having unique structural arrangements.

Abstract: A temperature compensated RF sensing circuitry for use in a remotely mountable weatherproof bi-directional, half-duplex switching amplifier system designed to provide maximum range for low power half-duplex radios such as Spread Spectrum radio transceivers in utilizing a voltage reference that is connected between a power supply circuit and a reference potential with a thermistor for temperature compensation purposes.

Abstract: A method of sensing the desvcrete operational states of a device that is remote from a direct current power supply in which the desrete operational states have different levels of electrical power for use in a remotely mountable weatherproof bi-directional, half-duplex switching amplifier system designed to provide maximum range for low power half-duplex radios such as Spread Spectrum radio transceivers and in which the current being drawn by the device flows through a series connected resistor and in which the voltage drop across the resistor is sensed.

Abstract: A remotely mountable weatherproof bi-directional, half-duplex switching amplifier system is designed to provide maximum range for low power half-duplex radios such as Spread Spectrum radio transceivers. This invention automatically senses when to go into the transmitter amplification mode and puts all the transmit power right at the antenna. In the receive mode, it provides low noise pre amplification of received signals at the antenna thereby minimizing or even eliminating the effects of the coaxial transmission line from the radio transceiver to the remote location of the antenna. The invention is preferred to be in a waterproof enclosure adjacent to the antenna mounted to a pole and powered by a DC injector and excited by a transceiver, both pole and injector located remote from the mounting pole and also includes an improved electrostatic overvoltage protection device.