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Page Title: LOADING AND CLEARING FH SYNC TIME. Continued
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TM   11-5821-333-12 3-4. LOADING AND CLEARING FH SYNC TIME. Continued b.  Loading  FH  Sync  Time  (ERF): There  are  seven  clocks  in  the  RT.  There  is  a  master  clock  and  one  clock  for  each  channel  1  through  6. When  time  is  first  set  in  the  RT  (cold  start  ERF  or  manually),  all  seven  clocks  are  set  to the same time. It is not possible to reset the sync time for just one channel manually. This can only be done using ERF. When ERF is re- ceived into a specific channel, the sender’s net time is also received and stored in that channel. A typical  NCS procedure   for  loading  FH  sync  time  through  receipt  of  an  ERF  would  be: (1)   Prepare   NCS   radio   to   receive   an   ERF. (2)  Request,  or  stand  by  for,  an  ERF  from  higher  level  NCS. (3)   Store   ERF   in   one   channel   (e.g.,   Chan   2). Read  "HFxxx"  and  note  display  blink.  Press STO   (Sto/ENT),   read   "STO_",   and   press   "2".   ERF   is   now   stored   in   Channel   2. (4)   Now   store   ERF   in   own   unit   channel   (e.g.,   Chan   1).   Set   MODE   to   FH-M   and PRESET   to   2.   Press   LOAD   (H-Ld),   read   "HLD_".   Press   "2",   read   "HFxxx".   press STO(Sto/ENT),   read   "STO_",   press   1. ERF  from  higher  NCS  is  now  also  stored  in unit  operating  channel. (5)  Change  net  ID  of  ERF  in  Chan  1  to  that  designated  for  own  unit  (either  by  keypad  or use  of  fill  device). NOTE NCS radio is now ready for own unit net opening. By loading sync time by ERF, the higher net, your own NCS radio, and your unit operators now all have the same sync time. This fact makes cross-net  communications  easy.  The  same  procedure  can  be  used  also  for  net  updates. c.  Checking  FH  Sync  Time: (1)  Set  FCTN  switch  to  SQ  ON  and  PRESET  switch  to  the  channel  to  be  checked.  (If checking   “base”   time,   MODE   switch  must  be  set  to  SC. (2) Press  TIME  three  times. .  , Each  press  will  give  You  a  different  display. Refer  ‘to  the  Julian  calendar  as  needed,  page  A-2. 1ST PRESS 2ND PRESS 3RD PRESS DAYS HOURS   MINUTES MINUTES    SECONDS (LAST  T WO-DIGITs OF   JULIAN   DATE) NOTES Changing FH sync time must be done with caution. FH sync time is not the same as local time. Normally, FH sync time is changed only when loading other FH data. Changing FH sync time will  result  in  loss  of  communication  with  other  radios  in  net. FH  sync  time  for  all  RTs  in  a  net  must  be  within  ±4  seconds. FH sync time is lost if the RT memory is erased (FUNCTION switch set to   Z-A or  STOW). The FH sync time clock will stop running when the RT FUNCTION switch has been at OFF for 24 hours  or  more. FH  sync  time  can  be  checked  by  pressing  keyboard  •••/TIME  three  times  and  watching  the display. Section Il. NET MANAGEMENT Subject Para Page Bringing Another Station into the Net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8 3-7 Cold Start Net Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 3-5 Net  Opening  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  3-5 3-4 Net Update Using ERF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 3-6 3-5. NET OPENING. Special data is used by the RT to operate in FH mode. All radios in a net must have the same data. Some FH data is loaded into the net member RT using local fill procedures. Other FH data is transferred to the net member using net opening procedures. Net opening is the means by which you, the NCS, transfer to the net members any FH data they still need after local fill procedures are completed. The Signal Operation Instructions (SOI) will tell you what  FH  data  to  use. NOTE l If  you  want  to  save  your  FH  data  after  net  opening,  do  not  set  FUNCTION  switch  to 3-4 STOW or Z-A.


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