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Assignment 3-Cont. - 14103_139
Assignment 3-Cont. - 14103_141

Fire Controlman Volume 06-Digital Communications
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3-49. Which of the following tones are graphically displayed by the LMS-11 Spectrum  Display? 1.  30  tones  that  are  the  odd  harmonics  of 55  Hz 2.  30  tones  that  are  the  even  harmonics of  55  Hz 3.  The  605  Hz  tone  and  the  noise  tone only 4.  The  15  data  tones  only 3-50. Under ideal conditions, at what level should the data tones be displayed on the bar graph of the spectrum display? 1  . 0 dB 2 . +6 dB 3 . -6  dB 4. +4 dB 3-51. 3-52. When the operator enters PU 00 into the PU address field of the spectrum display what effect, if any, will it have on the operation  of  the  LMS-11? 1.  00  is  an  illegal  address;  therefore,  no data  will  be  displayed 2.  The  LMS-11  will  continuously update  the  display  for  each  unit  in the   net 3.  The  LMS-11  will  update  the  display for  NCS  only 4.  No  effect,  the  LMS-11  will  continue to  update  the  last  legal  address entered Carrier suppression can only be tested when the Link-11 system is operating in which of the following modes? 1.  Net  Test 2.   Net   Sync 3.   Roll   call 4.   Broadcast 26 3-53. When reading the LMS-11 spectrum 3-54. 3-55. 3-56. display, the technician notices that only the 605 Hz tone and the 2195 Hz tones are  displayed.  Which  of  the  following setup entries would cause this display? 1.  The  RESTRICT  field  set  to  preamble o n l y 2.  The  RESTRICT  field  set  to  data  only 3.  The  PU  field  is  set  to  a  unit  not  in the   net 4.  The  SIDEBAND  SELECT  is  set  to USB   only Link-4A is what type of tactical digital information  link? 1.   Ship-to-aircraft 2.   Ship-to-submarine 3.  Ship-to-shore 4.  Ship-to-ship Link-4A is used to transmit which of the following  types  of  information? 1.  High-speed  computer-to-computer tactical   information 2.  Tactical  information  from  a  CDS ship  to  a  non-CDS  ship 3.  Aircraft  control  and  target information 4.  All  of  the  above Link-4A data is transmitted by using which  of  the  following  methods? 1.  Frequency-shift  keying 2.  Phase-shift  keying 3.  Audio  frequency  tone  shift 4.   Quadrature   differential   phase-shift keying






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