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Figure 2-10. FH Block Diagram
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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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SELF-TEST.  Continued - TM-11-5820-890-30-5_42


TM 11-5820-890-30-5 2-16.  SELF-TEST. The RT self-test is performed at several levels. When the FCTN switch is set to TST, the control module begins the self-test routines. The RT receive path, ECCM module, data rate adapter, fill routing module, and audio/data I/O module are checked. A test line to the SYSTEM connector is activated. This allows the RT to report the results of  SNAP  self-tests.  A  self-test  of  the  remote  control  modules  can  be  performed  separately. a.  Display  Checks.   “E  d”  should  be  the  first  display  when  the  FCTN  switch  is  set  to  TST,  the  control module checks for the presence of the ECCM module and the data rate adapter. The ECCM module grounds the FH HERE-N line. The data rate adapter grounds the DATA MODULE PRESENT-N line. See figure FO-8. If  either  module  is  absent,  its  letter  in  the  display  is  replaced  by  a  dash  (-). The next display is “88888”. It permits checking of the display segments. The SIG display can also be checked during  self-test.  All  display  segments  are  lit  sequentially  with  9  remaining  lit. b. Receive Path Test (FAIL 1).  The receive path is tested in four steps. First, the control module performs a memory check (RAM and ROM). Second, the control module checks the TONE SQUELCH line. It should be at logic 0 since there is no received signal. Third, the receive path is checked at eight frequencies in the SC mode. See  figure  FO-8.  The  150-Hz  tone  is  sent  from  the  switching  module  (FM  MOD)  to  the  exciter/power  amplifier. The  exciter/power  amplifier  uses  the  150-Hz  tone  to  modulate  its  3.9-MHz  output.  The  harmonics  from  the  3.9 MHz  are  used  as  the  test  frequencies.  The  tuner/mixer  and  synthesizer  are  stepped  through  eight  frequencies. The 150-Hz squelch tone presence is checked at each frequency. Because the tuner/mixer and synthesizer have several  bands,  it  is  possible  that  only  one  or  two  frequencies  will  fail.  The  last  step  repeats  the  receive  path checks  for  two  frequencies  in  the  FH  mode. There are secondary displays for each failed test. They will be displayed when any keyboard button is pressed while  the  FCTN  switch  is  being  set  to  TST.  They  are: SECONDARY DISPLAY FAILED  TEST 1--01 1--02 1--03 1--04 1--05 1--06 1--07 1--08 1--09 1--10 1--11 1--12 1--13 Control  module  RAM Control module ROM 150-Hz  detect  line  stuck  at  logic  1 Receive  at  78.0  MHz,  SC Receive  at  66.3  MHz,  SC Receive  at  58.5  MHz,  SC Receive  at  50.7  MHz,  SC Receive  at  46.8  MHz,  SC Receive  at  39.0  MHz,  SC Receive  at  35.1  MHz,  SC Receive  at  31.2  MHz,  SC Receive at 78.0 MHz, FH Receive at 35.1 MHz, FH 2-20


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