Quantcast Figure  2-5.  Audio/Data  Section  Module  Locations

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Figure  2-4.  RF  Section  Module  Locations
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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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Figure  2-6.  Power  Supply  Location


TM 11-5820-890-30-5 2-4. AUDIO/DATA SECTION. Continued Figure  2-5.  Audio/Data  Section  Module  Locations This section includes the COMSEC interface circuitry. All signals passing between the audio/data section and the rest of the RT are filtered or buffered by the audio power supply. These signals inside the audio/data section are called RED signals to avoid confusion. The audio power supply also adds the 150-Hz squelch tone to the audio or data  signal  to  be  transmitted. The The and The audio   control  module  performs  the  following  functions: Generation  of  audio/data  section  control  signals. Routing  of  data  signals  to  the  data  rate  adapter. Plain  text/cipher  text  (PT/CT)  signal  routing. Control  of  the  push-to-talk  line  inside  the  audio/data  section. audio/data I/O module controls signal routing within the audio/data section. It also contains the microphone audio  output  amplifiers. data  rate  adapter  performs  the  following  functions: Interleaves  and  deinterleaves  low  speed  data  into  the  16  kb/s  data  rate  of  the  RT. Provides  error  correction  at  low  speed  data  rates. Adds a synchronization preamble to the start of data transmissions to identify the type of data being transmitted. Inserts  and  removes  transitions  in  plain  text  data  modes. Generates  low  speed  data  clocks  and  synchronizes  local  clocks. 2-7


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