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EQUIPMENT  DATA.  Continued
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TM-11-5821-333-12 Non-ICOM Airborne Radio AN/ARC-201(V) ICOM Airborne Radio AN/ARC-201A(V) Manual
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FH SYNC TIME


TM   11-5821-333-12 Section  Ill.  TECHNICAL  PRINCIPLES  OF  OPERATION Subject Para Audio Signal Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16 Data Operation with Data Rate Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20 FH Sync Time . . . . . .  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-15 Frequency Hopping Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14 Frequency Hopping Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12 Homing Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23 Loading Operating Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19 Power Input  . . . . . . . . .   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-22 Remote Control Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21 Retransmit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24 Single Channel Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13 Voice Operation with KY-58 COMSEC Equipment . . . . . . . . . . . . . . . . . . . . . . 1-18 Page 1-11 1-17 1-11 1-10 1-12 1-10 1-19 1-14 1-19 1-18 1-20 1-10 1-13 1-12. GENERAL. a.  Keyboard  Operations.   The  keyboard  is  provided  as  an  interface  between  the  operator  and  the  RT. By using the keyboard, the operator can enter numerical information such as frequencies to be used and where to  store  those  frequencies  in  the  presets  provided.  Functions  may  also  be  performed  by  use  of  the  appropriate keys  on  the  keyboard.  For  example,  information  maybe  stored  impermanent  memory,  retrieved  into  holding memory  from  permanent  memory,  and  sent  to  other  radio  sets  by  use  of  the  function  keys. b.  Offsetting  a  Frequency.   A  frequency  can  be  offset  by  +5  or  +10kHz  using  the  RT  keyboard. c.  Clearing  a  Frequency.  A  frequency  can  be  cleared  byloading  a  new  frequency  or  by  loading  a  single zero. d. Keyboard Display.  The display responds when a procedure is performed and tells you what you must do next. 1-13. SINGLE CHANNEL MODE. In  the  single  channel  (SC)  mode,  your  radio  operates  on  one  selected  frequency,  Up  to  eight  single  channel frequencies  can  be  loaded  into  your  RT.  These  eight  single  channels  are  CUE,  MAN,  and  six  preset  channels. The  operating  frequency  is  selected  using  the  PRESET  switch. 1-14.  FREQUENCY  HOPPING  MODE. Frequency hopping (FH) limits the ability of enemy forces to use electronic countermeasures. Their ability to find your  location  using  direction  finding  equipment  and  their  ability  to  jam  your  transmissions  are  both  greatly  re- duced. During   FH   operation,   your   radio   changes   frequency   approximately   100   times   per   second.   It   can   hop   from   be- tween  1  to  2320  individual  frequencies,  A  band  of  frequencies  from  30  to  87.975  MHz  is  available  in  25  kHz  steps. Both  the  transmitting  FH  radio  and  the  receiving  FH  radio  jump  in  an  identical  sequence.  The  net  FH  radios  use the   following   FH   data   to   synchronize   hopping: h o p s e t lockout   set(s),   if   needed Net   ID Transmission Security (TRANSEC) variable or Transmission Security Key (TSK) F H   s y n c   t i m e A hopset is the group of frequencies which the radio may use. A lockout set prevents the RT from using unavail- able  frequencies.  The  Net  ID  is  a  number  which  is  unique  to  one  net  and  determines  where  in  the  hopset  the hopping  sequence  starts.  The  TRANSEC  variable  (or  TSK)  controls  the  hopping  sequence.  The  FH  sync  time  is  - used  to  synchronize  the  clocks  in  all  radios  in  a  particular  net. The FH data must be loaded into your RT before FH net operation is possible. The data is loaded locally using electronic local fill and remotely using Electronic Remote Fill (ERF). In Non-lCOM radio sets, the TRANSEC vari- able  is  loaded  locally  only.  In  ICOM  radio  sets,  the  TRANSEC  variable  is  called  TSK  and  is  loaded  with  the  hopset. 1-10


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