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PRINCIPLES OF OPERATION BLOCK DIAGRAM
TECHNICAL THEORY OF OPERATION - Continued

Simulator, Detector Uni Chemical Agent Automatic Alarm, M81 \(Nsn 6665-01-088-4789\)
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TECHNICAL THEORY OF OPERATION
The  Simulator  makes  it  possible  to  activate  M43A1  Detectors  from  up  to  1000  meters
away.
Using  the  Simulator,  an  operator  can  imitate  the  movement  of  a  chemical
agent  cloud  across  an  area.
Each  Simulator  consists  of  one  transmitter,  four
receivers,  cables,  antennas,  and  two  sets  of  tone  modules.
The  transmitter  is  used  to  broadcast  a  frequency-modulated  (FM)  radio  signal,  which
causes  an  electronic  switch  closure  in  a  receiver.
This  switch  closure  causes  an
M43A1  Detector  to  alarm.
The  signal  broadcast  by  the  transmitter  consists  of  three  different  tones  which  are
The  actual  tones  and  the  order  in  which  they  are
transmitted  in  a  timed  sequence.
transmitted  can  be  varied,  and  make  up  the  signal  code.
This  code  determines  which
receiver(s)  will  respond  to  a  signal  from  a  transmitter.
The  key  to
the  code  is  the  plug-in  tone  module.
The  tone  module  consists  of  three
resistors.
The  values  of  the  resistors  determine  the  signal  tones.  The  physical
positions  of  the  resistors  in  the  tone  module  determine  the  basic  sequence.  The
actual  sequence  in  which  the  tones  are  transmitted  is  determined  by  the  setting  of
the  5-position  CHAN  SEL  switch.
The  signal  code  a  receiver  will  respond  to  is  determined  by  the  receiver  tone
module.
The  receiver  tone  module  also  contains  three  resistors.  The  values  of  the
resistors  determine  to  which  tones  the  receiver  will  respond.
The  physical  posi-
tions  of  the  resistors  in  the  tone  module  determine  to  which  tone  sequence  the
receiver  will  respond.
Each  tone  module  is  identified  by  a  SERIAL  number.  The  first  three  digits,  or
GROUP  number,  will  vary  according  to  the  values  of  the  resistors  in  the  tone
module.
The  last  digit,  or  UNIT  number,  will  vary  according  to  the  physical  posi-
The  UNIT  number  for  a  transmitter  tone
tions  of  the  resistors  in  the  tone  module.
module  is  always  5.
The  UNIT  number  for  a  receiver  tone  module  can  be  1,  2,  3,  or
4.
The  transmitter  tone  module  is  mounted  on  the  encoder  printed  wiring  assembly.  The
receiver  tone  module  is  mounted  on  the  decoder  printed  wiring  assembly.
Transmitter  tone  modules  cannot  be  mounted  in  receivers,  and  receiver  tone  modules
cannot  be  mounted  in  transmitters.
CAUTION
Any  attempt  to  mount  a  transmitter  tone  module
in  a  receiver  or  vice-versa  could  damage  the
equipment.
Each  set  consists  of  one  transmitter  tone
Each  tone
module  is  part  of  a  set.
The  GROUP  numbers  on  all  five  tone  modules
module  and  four  receiver  tone  modules.
in  a  set  will  be  the  same.
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