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RADAR   COLLIMATION   SHORE   TOWERS
RADAR   COLLIMATION   PROCEDURES

Fire Controlman Volume 04-Fire Control Maintenance Concepts
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Figure 4-5.—Collimation tower. TOWER  ARRAY The  tower  array  can  be  moved  in  train  and  eleva- tion  by  either  powered  or  manual  means.  The  array consists   of   a   metal   frame   (usually   constructed   from aluminum   piping)   and   test   antennas   and   optical   tar- gets   required   for   shore-tower   checkout   of   shipboard radars.  The  test  antennas  and  the  optical  targets  are mounted  on  the  metal  frame  and  spaced  to  correspond to   the   spacing   between   the   center   of   radiation   (RF axis)  and  the  telescope  or  boresight  axis  of  each  ship- board  radar.  This  eliminates  parallax  errors  caused  by the  small  ship-to-tower  distance  involved  during  nor- mal   tower   operations. The  targets  are  illuminated  by  either  back  lighting or  floodlights.  The  four  test  antennas  and  their  charac- teristics,  the  associated  optical  targets,  and  the  appli- cable  radar  systems  that  can  be  tested  are  summarized in  figure  4-6. Figure 4-6.—(A) Standard tower array; (B) Array usage. COLLIMATION   TEST   EQUIPMENT Each  collimation  tower  is  equipped  with  a  set  of test  equipment  for  specific  tower  use.  This  equipment is   stowed   in   the   tower   equipment   room.   The   major items   include M.  Radar  Test  Set  AN/SPM-9, 4-5






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