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REMOTE CONTROL  OPERATION.  Continued
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TM-11-5820-890-30-5 Ground Non-Icom Radio Sets Consisting of: Receiver-Transmitter Radio RT-1439/VRC (NSN 5896-01-195-0827) Manual
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Section  II.  REPAIR  PARTS,  SPECIAL  TOOLS,  TMDE, AND  SUPPORT  EQUIPMENT - TM-11-5820-890-30-5_47


TM 11-5820-890-30-5 2-20. CIPHER TEXT. The RT can be used with a COMSEC device to receive and transmit cipher text (CT) information. The COMSEC device  is  cabled  to  the  RT  at  connector  J5.  Audio,  data,  and  control  signals  are  routed  automatically. When a cipher text signal is received, it is routed through the COMSEC device. See figure FO-11. The COMSEC device  will  ground  the  IRNST(1)-P  line  to  indicate  CT  operation.  The  received  signal  (RDCT)  is  routed  to  the COMSEC device. The decrypted signal (AR/DDR) is returned to the RT. If it is an audio signal, it follows the normal audio path. If it is a digital signal, it will follow the normal digital path. The COMSEC device provides the DDCO signal. When an audio signal is received in the FH and CT modes, the ECCM module deinterleaves the data stream. The COMSEC  device  recovers  the  audio  signal  from  the  data  stream. When transmitting, the signal sent to the COMSEC device can be either audio (AT) or 16 kb/s digital (DDT). See figure FO-12. The RED DDMC-N line is set to logic 1 for audio. It is set to logic 0 for digital. The COMSEC PTT-N line is grounded for transmit. The audio control module routes the signals to the COMSEC device. The encrypted signal  (TDCT)  is  returned  and  routed  to  the  switching  module. Audio  and  data  signals  are  interleaved  in  the  FH  mode  after  encryption. 2-21.  SNAP  INTERFACE. The RT provides seven signals for operation with a SNAP. The SNAP is cabled to J10 on the mounting adapter, See  figure  FO-14.  They  are  as  follows: SIGNAL  NAME FH SERIAL DATA TUNE  GATE-N TUNE CLK TEST SNAP DISABLE SNAP  XMT/RCV The SNAP returns DESCRIPTION SOURCE Logic 1   =  FH,  logic  0  =  SC. 1A4-30 Digital  data  stream  that  provides  operating  frequency. 1A4-48 Logic 0 pulse used with SERIAL DATA. 1A4-49 Clock used with SERIAL DATA. 1A4-51 Directs  SNAP  to  perform  self-test. 1A4-38 Logic  0  indicates  RT  is  changing  frequency. 1A12-75 Logic 1   =  transmit,  logic  0  =  receive. 1A12-76 the  results  of  its  self-test  on  the  FAULT6  line.  If  it  fails  self-test,  the  RT  will  display  “FAIL6”. 2-25


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