. The Bell System technical journal . WAVE GUIDE DISTRIBUTING MANIFOLDWITH ROTARY PHASE CHANGERS(720° PHASE CHANGE PER REV.) INPUT Fig. 52.—Schematic Diagram of Poljrod Fire Control Antenna. The operation of the rocking horse is described in Sec. It is essen-tially a carefully designed and firmly built paraboloidal antenna whichoscillates rapidly through the scanning sector. Its oscillation is dynamicallybalanced to eliminate undesirable vibration. Figure 54 is a photograph of a production model of the rocking horseantenna. The Mark 19 Radar Aiilcmia^^ In Anti-aircraft Fire Control
. The Bell System technical journal . WAVE GUIDE DISTRIBUTING MANIFOLDWITH ROTARY PHASE CHANGERS(720° PHASE CHANGE PER REV.) INPUT Fig. 52.—Schematic Diagram of Poljrod Fire Control Antenna. The operation of the rocking horse is described in Sec. It is essen-tially a carefully designed and firmly built paraboloidal antenna whichoscillates rapidly through the scanning sector. Its oscillation is dynamicallybalanced to eliminate undesirable vibration. Figure 54 is a photograph of a production model of the rocking horseantenna. The Mark 19 Radar Aiilcmia^^ In Anti-aircraft Fire Control Radar Systems for Heavy Machine Gunsit is necessary to em])loy a highly directive antenna and to obtain continu-ous rapid comparison of the received signals on a number of beam positions Sections , and were written by F. E. Nimmcke. RADAR ANTENNAS 303. 304 BELL SYSTEM TECHNICAL JOURNAL as discussed in Section Such an antenna is also required to obtainthe high angular precision for anti-aircraft fire control. These require-ments are achieved by the use of a conical scanning system. The beamfrom the antenna describes a narrow cone and the deviation of the axisof the cone from the line of sight to the target can be determined and meas-ured by the phase difference between the amplitude modulated receivedsignal and the frequency of the reference generator associated with the
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
