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RECEIVER   SYSTEM   FUNCTIONAL   AREAS
Local  Oscillators

Fire Controlman Volume 02-Fire Control Radar Fundamentals
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magnitude   is   proportional   to   the   deviation   from   the The  base  frequency  is  much  lower  than  the  trans- correct  IF,  and  the  polarity  determines  the  direction  of mitted  frequency  and  is  multiplied  and  mixed  at  dif- the  error.  The  error  voltage  corrects  the  frequency  of ferent  levels.  Since  the  local  oscillator  signal  is  picked the  local  oscillator  common  to  both  the  receiver  mixer off  at  the  appropriate  level,  it  is  locked  to  the  trans- and  the  AFC  mixer  Many  of  the  newer  radar  systems mitter   frequency   without   an   AFC   system.   This   also eliminate   the   requirement   for   the   AFC   system   by allows  frequency  diversity  and  agility  with  each  trans- fusing  a  special  coherent  frequency  generator  system. mitted  pulse,  which  an  AFC  circuit  could  not  track. Figure 2-11.—Radar receiver general functions. 2-22






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