Rotatable aerial installation mounted on a mast with remote mechanical drive
First Claim
1. In a rotatable aerial installation, especially for ship-borne and ground satellite stations of the type having a mast at the upper end of which rotatable basket means contains the transmitting/receiving aerial, the improvement comprisinga turntable within the basket at the top of the mast mounted for rotation about a vertical axis,said turntable comprising a first rim with gearing for azimuth displacement of the aerial and a second rim with internal/external, double-gearing for elevational displacement of the aerial,differential gearing means comprising two drive shafts and two driven shafts,means for separately driving each of the drive shafts of the differential gearing,means for driving said first rim by means of one of the drive shafts of the differential gearing means,means for driving the second rim from the other of said drive shafts of the differential gearing means,a fixed wave guide extending upwardly to said turntable and concentric with the rotational axis of the latter,a quarter-wave joint mounted on the turntable and surrounding the upper end of said wave guide with a clearance therebetween,a wave guide probe extending from said turntable into said wave guide adapted to transmit signals between the wave guide and the aerial.
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Accused Products
Abstract
Slip-ring electrical contacts are avoided in a rotatable aerial or antenna of the type which is housed in a rotatable cage or basket having a supporting platform at the top of a mast, by constructing the electrical transmitting/receiving apparatus and the drive and control units for the rotating aerial at some region below the supporting platform for the rotating cage or basket, e.g., below deck in the case of a ship, and by transmitting the signal to or from the aerial by means of a wave guide concentrically arranged below and surrounding the axis of rotation of the cage, including a quarter wave joint surrounding the wave guide (with a clearance) on the platform, and connecting the wave guide to the aerial with the aid of a probe extending into the wave guide, two motor devices operating through differential gearing, all included in the region below the platform enabling the azimuth and elevation of the aerial to be determined.
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Citations
5 Claims
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1. In a rotatable aerial installation, especially for ship-borne and ground satellite stations of the type having a mast at the upper end of which rotatable basket means contains the transmitting/receiving aerial, the improvement comprising
a turntable within the basket at the top of the mast mounted for rotation about a vertical axis, said turntable comprising a first rim with gearing for azimuth displacement of the aerial and a second rim with internal/external, double-gearing for elevational displacement of the aerial, differential gearing means comprising two drive shafts and two driven shafts, means for separately driving each of the drive shafts of the differential gearing, means for driving said first rim by means of one of the drive shafts of the differential gearing means, means for driving the second rim from the other of said drive shafts of the differential gearing means, a fixed wave guide extending upwardly to said turntable and concentric with the rotational axis of the latter, a quarter-wave joint mounted on the turntable and surrounding the upper end of said wave guide with a clearance therebetween, a wave guide probe extending from said turntable into said wave guide adapted to transmit signals between the wave guide and the aerial.
Specification