shown  in  figure  2-9.  The  AN/SPN-46(V)2  functions the same as the AN/SPS-46(V)1, except that it does NOT use the MK 16 Mod 12 stable elements (units 17 and 18). Also, the (V)2 uses a 7-foot diameter antenna instead of the 4-foot antenna used for the (V)1. The display subsystem consists of two identical operator control consoles (OCC) (units 1 and 2), one for each channel of the system. The OCCs allow the final controllers to control and monitor the AN/SPN-46(V) system.  The  OCC  includes  a  radar  display,  a  data generator, and an embedded computer. The OJ-314 system  installed  in  the  OCC  provides  operator communications. The  ancillary   equipment   subsystem   includes aircraft control indicators (units 4, 6, and 7) for the Carrier  Air  Traffic  Control  Center  (CATCC)  and Primary   Flight   (PRI-FLI)   areas.   The   PRI-FLI indicators  (units  6  and  7)  display  the  flight  information and   system   status   required   for   each   OCC.   The recorder-converter (unit 8) records selected system data. The landing signal officer (LSO) waveoff light (unit 10) provides the LSO with a visual indication of the system waveoff  on  the  nearest  aircraft  under  control. The central computer  subsystem  (CCS),  consisting of  two  identical  AN/AYK-  14(V)  computer  sets,  receives data  from  the  radar/SMS  and  OCCs.  It  computes aircraft command and error signals and transmits them to controlled aircraft via Link 4A. The radar/ships  motion  sensor  (SMS)  subsystem consists of two radar channels, each with an X-band receiver, a Ka-band transmitter, and an antenna. It consists of several units, including the receiver and antenna (units 24 and 25), Mk 16 stabilization elements (units 17 and 18), and embedded computer processors (unit 19). Aircraft tracking information (from the radar) combines with ship’s stabilization data (from the Mk 16 gyros) and goes to the CCS for processing. SIGNIFICANT  INTERFACES.—  The  digital data  switchboard  (unit  14)  provides  an  automatic switching interface between the master-slave computers in the central computer group (unit 12) and all external system  peripherals  required  for  PALS  operation.  The AN/TPX-42A(V)8  CATCC  DAIR,  AN/SSW-1C/D,  and OA-7984(U)/UYK  Input/Output  (I/O)  Control  Console (unit 16) can all operate as the master computer of the CCS.  Electrically  operated  switches  automatically switch   these   equipment   into   a   master   or   slave configuration  in  the  central  computer  group.  The AN/SPN-46(V) also interfaces with the AN/TPX-42(V)8 system through the power distribution panel (unit 3). Other  radars,  such  as  the  AN/SPN-35,  the AN/SPN-43,  and  the  AN/SPN-44,  are  also  used  in conjunction  with  the  precession  carrier  controlled approach (CCA) system for landing operations. AN/SPN-35.— The AN/SPN-35 radar set provides both  azimuth  and  elevation  data  for  precision approaches to aircraft carriers during adverse weather conditions. Using the radar display, the operator directs pilots  along  a  predetermined  glide  path  and  azimuth courseline to a point one mile from the ship. AN/SPN-43.— The AN/SPN-43 is a surveillance and  air  traffic  control  radar  used  on  carriers  and amphibious-type   ships. It  operates  in  a  2-4  GHZ frequency  band  (S-Band)  and  provides  air  navigational data for control and identification of aircraft in the area of the ship. With a range of 50 nautical miles, it tracks low-flying  aircraft  to  a  minimum  of  250  yards  and covers  360°  at  altitudes  from  radar  horizon  to  30,000 feet. The radar displays azimuth and range which the operator uses to direct control of the aircraft to the CCA transfer  point.  An  IFF  system,  synchronized  with  the radar,  provides  positive  identification  of  the  aircraft. AN/SPN-44.—  The AN/SPN-44 is a range-rate radar set that computes, indicates, and records the speed of aircraft making a landing approach to the carrier. Both true and relative air speed are indicated. Supplied with this accurate information on the speed of the approaching  aircraft,  the  LSO  can  wave  off  those attempting to land at an unsafe speed. FOR THE MAINTAINER.— The  AN/SPN-46(V) is a modernized PALS system that provides improved reliability,  maintainability,  and  performance.  It  uses standard  electronic  modules  (SEMs),  an  AN/USH-26 Magnetic  Tape  Unit  (MTU)  and  standard  computers (AN/AYK-14)  to  provide  reliability  and  improved supply  support. The  AN/SPN-46(V)  has  a  self-monitor  capability  to prevent the transmission of erroneous control and error signals in Mode I and Mode II operation. It also displays the  deck  status. The  power  distribution  panel  (unit  3)  provides circuit breaker protection and acts as a junction box for all   stabilization   source   inputs   and   outputs,   and anemometer inputs. The PRI-FLI indicator control (unit  5)  contains  circuit  breaker  protection  for  PRI-FLI indicators (units 6 and 7) and a maintenance intercom for  troubleshooting  purposes.  The  recorder-converter 2-16


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