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DATA  OPERATION  WITH  DATA  RATE  ADAPTER
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TM-11-5821-333-12 Non-ICOM Airborne Radio AN/ARC-201(V) ICOM Airborne Radio AN/ARC-201A(V) Manual
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POWER INPUT


TM   11-5821-333-12 1-20. DATA OPERATION WITH DATA RATE ADAPTER.  Continued d.  Plain-Text  Data.  Incoming  FSK  tones  are  routed  from  the  intercom  to  the  DRA  (through  the  Z-AHQ,  if used). The DRA recognizes the signal as FSK. The DRA adds a preamble code word that identifies the signal as data. The FSK tone is converted to 16 kb/s data, conditioned, and routed to the RT for transmitting. A received signal is routed from the RT to the DRA (through the Z-AHQ, if used). The signal is processed, converted to FSK tones,  and  routed  to  the  intercom  (through  the  Z-AHQ,  if  used)  for  processing  by  the  digital  equipment. e.  Cipher-Text  Data.  Incoming FSK tones are routed from the intercom to the DRA (through the Z-AHQ, if used).  The  DRA  recognizes  the  signal  as  FSK.  It  generates  a  preamble  code  word  that  identifies  the  signal  as data.  The  FSK  tones  are  converted  to  16  kb/s  data,  conditioned,  and  routed  to  the  KY-58  for  encryption.  The encrypted  data  is  returned  to  the  DRA  and  routed  to  the  RT  for  transmitting  (through  the  Z-AHQ,  if  used).  A received signal is routed from the RT to the DRA (through the Z-AHQ, if used). The DRA initially places the KY-58 in data mode and checks for the code word preamble that identifies the signal as data. This code word should be present. The KY-58 remains in data mode. The decrypted signal is processed by the DRA and converted to FSK tones.  The  FSK  tones  are  routed  to  the  intercom  (through  the  Z-AHQ,  if  used)  for  processing  by  the equipment. 1-21. REMOTE CONTROL OPERATION. digital ARRANGEMENT An RCU is required with the remote RT. An RCU remote RT. The RCU communicates with the RT over a serial data interface. Control and data words are transferred from RCU to RT, Display words are transferred from RT to RCU. The RT receive audio is routed through the RCU volume control  on  the  way  to  the  intercom  headset. A take control switch is used when a radio set has dual controls. Only one control point at a time is functional. The other  is  disabled  by  the  ground  from  the  take  control  switch.  The  take  control  ground  also  causes  the  volume control  to  be  bypassed  on  the  disabled  control.  The  display  on  the  disabled  control  will  still  function. FOR  REMOTE  CONTROL  OPERATION is optional with the panel RT. A second RCU is optional with the 1-18


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