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LOADING OPERATING DATA.  Continued - TM-11-5821-333-12_25
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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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DATA OPERATION WITH DATA RATE ADAPTER.  Continued


TM   11-5821-333-12 ARRANGEMENT  FOR  DATA  OPERATION  WITH  DRA. a.  Introduction.   The  following  aircraft  data  equipment  are  compatible  with  the  data  rate  adapter: TACFIRE   AN/PSG-2   Digital   Memory   Device Airborne   Target   Handover   System   (ATHS) Signals  from  these  equipments  are  input  to  the  radio  through  the  aircraft  intercom.  Both  types  of  data equipment  use  frequency  shift  keying  (FSK)  signals.  The  DRA  conditions  the  FSK  to  the  16  kb/s  digital  data required by the RT. With data equipment in place, the radio set will still handle voice signals. The DRA recognizes FSK  signals.  FSK  signals  are  converted  to  data.  Voice  signals  are  not.  Operation  may  be  with  both  data  and COMSEC  equipment.  In  that  case,  there  are  four  types  of  operation:     Plain-text voice Cipher-text  voice      Plain-text data Cipher-text  data b. Plain-Text Voice.  The operator talks into the headset. Audio signals are routed from the intercom to the DRA (through Z-AHQ, if used). FSK is not detected by the DRA. So the DRA routes the audio directly to the RT for transmitting.  Received  audio  from  the  RT  is  sent  directly  to  the  intercom,  through  the  Z-AHQ,  if  used,  and otherwise  through  the  DRA.  The  operator  hears  voice  audio  in  the  headset. c.  Cipher-Text  Voice.  The  operator  talks  into  the  headset.  Audio  signals  are  routed  from  the  intercom  to the DRA (through the Z-AHQ, if used). The DRA recognizes the signal as voice (not FSK data) and routes it to the KY-58 where it is encrypted. The encrypted signal then goes through the DRA to the RT (through the Z-AHQ, if used) for transmitting. 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 the data mode and checks for a preamble code word that identifies the signal  as data. This code word should be absent. The DRA then places the KY-58 in the voice mode and the signal is decrypted and  routed  out  to  the  intercom  through  the  DRA  (and  Z-AHQ,  if  used).  The  operator  hears  voice  audio  in  the headset. 1-17 1-20  DATA  OPERATION  WITH  DATA  RATE  ADAPTER


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