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TOWER  ARRAY
TRACK-RECEIVE   AXIS   COLLIMATION

Fire Controlman Volume 04-Fire Control Maintenance Concepts
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Range   Calibrator   Set   AN/UPM-115, Range   Calibrator   Set   AN/SPM-6, Radar  Beacon  Test  Set  AN/TPN-7  or AN/UPN-32, Continuous-Wave  Acquisition  and  Track (CWAT)  Tower  Transponder,  and Microwave  Power  Meter  HP  430. Some  of  this  test  equipment  is  in  the  process  of being   replaced   and   can   be   identified   in   the   combat systems  alignment  manual  that  is  specific  to  your class  of  ship.  A  number  of  additional  items  of  general- purpose  test  equipment,  such  as  oscilloscopes,  signal generators,   coaxial   cables,   directional   couplers,   and variable   attenuators   are   also   used   at   both   the   tower and  aboard  the  ship. RADAR   COLLIMATION   PROCEDURES Shore-tower   checks   between   regular   overhaul periods  are  generally  not  performed  except  when  the Naval   Sea   Systems   Command   (NAVSEA)   or   the Naval  Ship  Weapon  Systems  Engineering  Station (NSWSES)  specifies  a  shore-tower  check  as  a  result of   extensive   shipyard   or   alteration   work,   or   after   a microwave   casualty   occurs   that   requires   microwave component   replacement.   On   ships   outfitted   with   a portable  ship’s  tower,  the  need  for  shore-tower  service is   established   when   ship   tower   checks   indicate   that tolerances  are  exceeded  or  when  correlation  data  is  in question. Certain   environmental   condition   requirements must  be  complied  with  before  tower  operation.  These include  the  amount  of  ship  motion  and  the  weather conditions  under  which  the  collimation  procedures  are performed. Because  ships  must  be  tested  while  afloat,  certain methods  of  limiting  the  motion  are  used.  One  method consists  of  securing  the  ship  snugly  to  a  pier  or  dock 4-6 or,   in   certain   cases   where   excessive   ship   motion   is created   because   of   tide   changes,   by   using   various weighing  methods,  as  shown  in  figure  4-7,  to  reduce the  ship’s  motion. Figure 4-7.—Ship weighting for reducing motion. Weather  conditions  must  be  considered  because  of the  adverse  effects  they  can  have  on  collimation  tests. For  example,  visibility  between  ship  and  tower,  wind and  water  action,  and  heat  radiation  can  affect  colli- mation   tests.   Visibility   should   be   good   between   the ship  and  the  tower.  High  winds  or  rough  water  can cause  ship  motion  to  be  so  excessive  as  to  invalidate test   results.   If   refraction   due   to   heat   radiation   is observed   while   viewing   an   optical   target,   considera- tion  should  be  given  to  rescheduling  operations  at  an earlier  hour  of  the  following  day. The  Tartar/SM1  weapons  system  is  employed aboard   several   classes   of   ships.   Each   class   of   ships has  a  unique  configuration  of  the  weapons  system components.  Consequently,  each  class  has  its  own specific   collimation   procedures. This  section  discusses  track-receive  axis  collima- tion,  track-transmit  axis  collimation,  and  CWI  axis collimation.  These  procedures  are  discussed  only  in  a general   way   and   do   not   address   specific   procedures for  any  particular  class  of  ships.






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