Abstract: A device for automatically expanding and contracting an antenna having a rotary member for moving a flexible rodlike member that is coupled to the antenna for expanding and contracting the antenna. A worm is driven by a motor to rotate about a motor axis and an intermediate gear unit having a worm wheel is formed unitarily with a small diameter gear, the worm wheel being engaged with the worm and the small diameter gear being engaged with the rotary member for rotatably driving the rotary member. A gear unit support frame is provided for supporting the intermediate gear unit and a support shaft is fixed to a casing member and coupled to the intermediate gear unit, the intermediate gear unit and the gear unit support frame being axially movable along the support shaft in a direction substantially perpendicular to the motor axis.

Abstract: In an electrically powered mechanism for expanding and contracting antenna in which an operation strip coupled to antenna overcoat members that are telescopically connected to expand or contract, is expanded or contracted by a rotary member driven by a motor, and the operation strip has a width greater than the thickness thereof, and has arcuate surfaces or flat surfaces; the rotary member is rotatably provided in a case body which is provided with an annular guide portion with a guide groove for guiding the operation strip to the side of the drum and to the side of the antenna overcoat members, and a strip-receiving groove is formed along said rotary member into which the operation strip is fitted; and the operation strip is fitted in a curved manner to the strip-receiving groove, and a torque for delivering or pulling the operation strip when the rotary member is roated is so selected as to produce a required holding force depending upon the thickness of the operation strip, the radius of curvature of the s

Abstract: A control apparatus is placed in a drive circuit of a motor of an electrically driven antenna. The drive circuit is provided in parallel with a transmitter-receiver circuit of a transmitter-receiver, and an operation unit is provided so that control instruction can be given by manual operation to a control apparatus. The electrically driven antenna is extended or contracted by an amount determined by the instruction that is given from an operation unit interlocked with a turn-on or off of the power source of a transmitter-receiver. The control apparatus includes, for example, switch plates which are moved by a small motor. Variable contact pieces for the switch plates are adjusted by a manual operation unit to obtain a suitable control instruction through mechanical operation. Alternatively, the control apparatus can be operated electrically by using a control circuit and operation unit.

Abstract: A power transmission system in which a power sending terminal is connected to a power receiving terminal via a communication cable made of a pair of parallel PVC-coated solid or stranded wires, the power sending terminal superposing DC-power on multiplex signals and transmitting the DC superposed multiplex signals through the communication cable to the power receiving terminal where DC power is separated from the multiplex signals to operate remote equipments.

Abstract: An antenna system is provided with a plurality of telescoped antenna sections which are extended and contracted by an operating wire connected to the uppermost antenna section. The wire is made of a relatively rigid material and has a width of 1.5.about.2.2 times its thickness. There is also provided a clutch for selectively operating the antenna by a motor or the human hand.