TM 1-1510-224-10 channel and its LSET code to be displayed.  Valid  LSET channels  are  I  through  6.    Other  possible  messages  are ERROR and  NO LSET (no  LSET  loaded  for  that  chan- nel). e L5.  In  FH mode, this function is used to time    FH    operations.        If    the    scratchpad    is    blank, depressing  L5  will  change  the  display  of  time  stored  in the    transceiver.        If    time    is    not    available    from    the transceiver,  the  display  remains  blank.    If  valid  data  is scratchpadded, the data will be displayed adjacent to L5 and  sent  to  the  transceiver.    Valid  time  data  is  day  (0 through   99),   hours   (0   through   23),   and   minutes   (0 through   59).      Data   fields   not   entered   are   considered zero. f R1.  Depressing RI will cause the legend at  RI  to  be  boxed  and  the  transceiver  to  be  put  into  the LATE  NET  E  (entry)  mode.    The  late  net  mode  can  be used  to  re-synchronize  the  radio  if  communication  has been lost due to drifting of the clock. g  R3.    The  function  key  R3  of  the  2-FM SETUP  page  (FH  format)  is  the   CLEAR  function  key. Pressing  R3  with  a  valid  hopset  (1-6)  or  lockset  (L1-L8) channel    number    in    the    scratch    pad    will    cause    the associated   hopset   or   lockset   to   be   cleared   from   the radio. h  R5.    R5  is  used  to  store  hopsets  and locksets  from  a  fill  device  into  the  transceiver.    When depressed,  the  legend  at  R5  will  be  boxed  and  will  load the  HSET or  LSET  channel  entered  into  the  scratchpad with the data from the fill device.  Valid  HSET entries are 1 through 6 or Hi through H6.  Valid  LSET  entries  are  L1 through  L6  or  the  single  character  L.    ERROR or   BAD can be displayed for unsuccessful or bad fill attempts. 2 In  the  air.    The  legend  at  R4  and  R5  will be  blanked  in  66  air  because  the  TSEC  FILL  and  FILL function   is   only   available   when   the   aircraft   is   on   the ground. (c) FH/M  (frequency  hopping  -  master mode).    This  mode  is  the  master/controller  versus  the member  mode  of  the  frequency  hopping  mode  of  the VHF-FM  transceiver.    The  data  at  the  top  center  of  the page is: Top line -  2-FM SETUP Second     line     -     The     currently     selected FH channel; and the text NET and the net number Third line -  CONTROL or  CONTROL/NO TSEC, but  can  read   FAIL,  EMER, or   TUNING  if  appropriate. The   display   formats   vary   somewhat   depending   upon whether the aircraft is on the ground or in the air. 1 On the ground. a L1.  Successive depressions of L1  will  cause  the  mode  to  change  from   SC  to   FH   to FHIM, with the active mode boxed. The    differences    between    the    FH/M    and    FH mode display formats are: FH/M   mode   -   L2   allows   the   operator   to   send (versus receive) frequency hopping data R1 (LATE NET) - Blanked. NOTE If  a  TRANSEC  variable  has  not  been loaded, the text NO TSEC will appear on   the   third   line   of   text   at   the   top center of the display. b   L2.      The   ERF   SEND   key   is   used   to initiate  transmission  of  frequency  hopping  data  from  the NET  controller's  radio.    When  data  is  in  the  scratchpad and L2 is depressed, the text  SENDING HSET CH X  or SENDING  LSET  CH  X  (where  X  is  the   HSET or  LSET channel     in     the     scratchpad)     is     displayed.          Valid scratchpad   data   is   I   through   6,   HI   through   H6,   or   L1 through   L8.      The   sending   legend   is   displayed   for   12 seconds or until the radio has finished sending. 2   In   the   air.      The   on-ground   and   in-air display formats for the FH/M mode are the same except that the legends TSEC FILL (R4) and FILL (R5) keys are blanked (these functions are not available in flight). c.   FM FREQ  List  Page.    The  FM  frequency  list  page  is accessed by depressing R4 on the  COMM  control  page when FM FREQ is displayed at R4.  This page is used to enter/delete  preset  frequencies  and  hopsets/locksets  for the    VHF-FM        transceiver.        On    power-up,    all    data displayed   in   the   frequency   list   box   (right   side   of   the display)  at  shutdown  is  recalled,  and  the  hopset/lockset information  stored  in  the  radio  is  recalled  and  displayed in   the   hopset/   lockset   box   (left   side   of   the   display). Leading    zeroes    and    zeroes    in    the    hundredths    and thousandths position are not displayed. (1) ADD  NET  function  key.    Function key  L1  of  the    UHF  frequency  list  page  is  the  add  net function key.  The   ADD NET  key  is  used  to  add  data  to the  AJ  NET  list.    Entering  valid  data  in  the  scratchpad and pressing LI causes the data in the scratchpad to be entered into the   AJ  NET  list.    Valid  data  consists  of  a valid net channel (1-20) followed by a valid net number (I to   5   digits   with   an   optional   decimal   point   whose   final form will be in the 3-18