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TRANSMIT RF SIGNAL PATH
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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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RECEIVE DATA SIGNAL PATH.  Continued


TM 11-5820-890-30-5 2-10. RECEIVE AUDIO SIGNAL PATH. Continued The   switching   module   detects   the   presence   of   the   150-Hz   squelch   tone.   If   present,   the   BIT   SYNC/TONE SQUELCH  line  is  set  to  logic  1.  The  switching  module  routes  the  FM  DEMOD  signal  through  the  processing circuitry. For single channel (SC), plain text (PT) operation, the signal continues as RCV PT AUDIO. It is routed through the audio power supply and the audio control module. The audio/data I/O module sums the audio signal (RCV AUDIO/SIDETONE) with the 600-Hz alarm tone, if present, and amplifies it. It is routed through a high-pass filter,  low-pass  filter,  and  the  VOL  control.  It  is  amplified  using  a  voltage-to-current  converter  and  routed  to  the AUD/FILL  and  AUD/DATA  connectors  at  pin  B. In the FH and PT mode, the FM DEMOD signal is a digital data stream. It is routed to the ECCM module as BIT SYNC DATA to be deinterleaved. (See paragraph 2-11.) The signal is sent through a digital-to-analog converter to recover the original audio signal. The audio signal is returned to the switching module as RCV FH PT AUDIO and continues along the RCV PT AUDIO path. In the cipher text (CT) mode, the FM DEMOD signal is again a digital data stream. It is routed to the COMSEC connector  (J5)  as  RCV  CT.  The  COMSEC  device  decrypts  the  signal  and  recovers  the  audio  signal.  The recovered  audio  (RCV  CT  AUDIO  DECODED)  is  routed  to  the  audio  control  module  and  back  into  the  audio receive  path. In the FH and CT mode, the ECCM module deinterleaves the data stream. The data stream (FH DATA) is routed to  the  COMSEC  device  where  the  audio  signal  is  recovered. 2-11.  TRANSMIT  AUDIO  SIGNAL  PATH. The transmit audio signal proceeds through the same modules as the receive audio signal only in reverse order. See figure FO-4. The audio transmit (AT) signal is input at J3 or J4 pin D. A PTT is required for the transmit mode. The  AT  signals  from  J3  and  J4  are  summed  by  the  audio/data  I/O  module.  The  audio  signal  is  routed  to  an automatic gain control (AGC) amplifier. If the WHSP switch is on, the gain of the AGC amplifier is increased. The XMT AUDIO signal is routed through the audio control module to the audio power supply. The audio power supply combines  the  XMT  AUDIO  signal  with  the  150-Hz  squelch  tone.  From  there  it  is  routed  through  the  switching module   to   the   exciter/power   amplifier. A PTT at J3 is routed through the audio/data I/O module to the audio control module. A PTT at J4 is routed directly to the audio control module. Both are combined to generate the AUDIO MDL PTT-N. It is buffered by the audio power  supply  and  sent  to  the  control  module  and  the  switching  module. When  operating  in  the  FH  mode,  the  XMT  AUDIO  signal  is  routed  from  the  audio  power  supply  to  the  ECCM module prior to the addition of the 150-Hz squelch tone. The ECCM module converts the XMT AUDIO signal into a digital data stream (FH DATA). The FH DATA signal goes to the switching module where it is amplified and routed to   the   exciter/power   amplifier   module. When  operating  in  cipher  text,  the  XMT  AUDIO  signal  is  routed  from  the  audio  control  module  to  the  COMSEC connector  (J5).  The  CT  XMT  signal  that  is  returned  is  a  digital  data  stream. 2-12.  RECEIVE  DATA  SIGNAL  PATH. The RT can receive audio data and digital data. Audio data can be processed using either AD1 or AD2. When the RT is set to use AD1, the analog data signal follows the audio receive path. When AD2 is used, the analog data is converted into 16 kb/s digital data by the transmitter. The receiver converts it back into analog data. Low speed digital  data  (75  b/s  to  4.8  kb/s)  is  also  transmitted  as  16  kb/s  digital  data.  Majority  logic  error  correction  is provided for AD2 and low speed digital data. The data rate adapter performs the data rate conversion and error correction. 2-15


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