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PULSE   AMPLIFIER/SYMBOL   GENERATOR (PA/SG)
PLAN   POSITION   INDICATOR   (PPI)

Fire Controlman Volume 05-Display Systems and Devices
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Figure 3-14.—The PA/SG front panel. CDS  computer.  Display  consoles  in  tactical  systems are  divided  into  two  or  more  display  groups,  with  up to  ten  consoles  in  each  group. PAs  come  in  three  configurations:  single  channel, dual  channel,  or  4-channel.  A  single  channel  CPA can   interface   with   one   computer   and   one   display group.  A  dual  channel  CPA  interfaces  two  computers with   two   display   groups,   and   a   4-channel   CPA interfaces  up  to  4  computers  with  4  display  groups. Symbol   Generator For   those   systems   using   waveform   symbol generators,  there  is  one  SG  for  each  output  channel  of the  PA.  A  single  symbol  generator  can  drive  two display  groups  in  the  event  of  malfunctions.  In  a  dual channel   PA   either   computer   channel   or   SG   can   be used  to  control  both  display  groups.  This  switching arrangement   allows   the   display   to   be   divided   for 3-11 maintenance   (one   group   for   normal   operations,   and one   group   for   testing)   or   controlled   from   one computer   for   normal   operations   or   system   level testing. Figure  3-14  shows  the  front  panel  controls  for  a dual  channel  PA/SG.  The  DATA  SOURCE  switches control   the   computer   and   TMG   (test   message generator)  selection  for  the  two  display  groups  (1  or 2).   The   SYMBOL   SOURCE   switch   controls   the configuration  of  the  symbol  generators. In   the NORMAL   position,   each   of   the   two   SGs   drive   one display  group. The  symbol  generator  can  uses  analog  waveforms or  digital  strokes  to  generate  symbols.  The  methods of symbol generation (analog or digital) are covered in chapter  one  of  this  training  manual.






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