. The Bell System technical journal . -Horizontal The SH and Mark 16 Autenna^^ The antennas designed for the SH and Mark 16 Radar Equipments arepractically identical. The SH system was a shipborne combined fire con-trol and search system, and the Mark 16 its land based counterpart was usedby the Marine Corps for directing shore batteries. These systems operated at cm. The requirement that the system,operate as a fire control as well as a search system imposed some ratherstringent mechanical requirements on the antenna. For search purposes,the antenna was rotated at 180 rpm, and indica
. The Bell System technical journal . -Horizontal The SH and Mark 16 Autenna^^ The antennas designed for the SH and Mark 16 Radar Equipments arepractically identical. The SH system was a shipborne combined fire con-trol and search system, and the Mark 16 its land based counterpart was usedby the Marine Corps for directing shore batteries. These systems operated at cm. The requirement that the system,operate as a fire control as well as a search system imposed some ratherstringent mechanical requirements on the antenna. For search purposes,the antenna was rotated at 180 rpm, and indications were presented on aplan position indicator. For fire control data, slow, accurately controlledmotion was recjuired. Bearing accuracy is attained by lobe switching in ^Written by R. J. Philipps. RADAR ANTENNAS 295 much the same manner as in the SJ and SJ-1 antennas previously described. The antenna is illustrated in Fig. 47, With the SH system, the unit is mast mounted; for the Mark 16, the unit is mounted atop a 50 foot steel. Fig. 46âThe SJ-1/Mark 27 Submarine Radar Antenna. tower which can be erected in a few hours with a minimum of electrical characteristics are as follows: Gainâ21. db Reflector Dimensions 30 W x 20 H Horizontal beam widthâ° Vertical beam widthâ12° Lobe separationâ5° approximately Loss in gain at lobe crossoverâ1 db approximately Scanâ(1) 360°, at 180 rpm for PPI operation (2) 360°, at approximately 1 rpm for accurate azimuth readings, with lobeswitching 296 BELL SYSTEM TECHNICAUJOURNAL SH systems were most successfully used in invasion operations in theAleutians. They were installed on landing craft, and the use of the high A
Size: 1340px × 1864px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
