TM 1-1510-224-10 (3) 2-FM  SETUP  page.      The   2-FM  SETUP page    allows    the    operator    to    set    up    the    VHF-FM transceiver.  On power-up, the transceiver is put into the self-test   mode   for   approximately   30   seconds.      During this period, the legend  TUNING is displayed adjacent to L1 on the  COMM  control  page  and  at  the  top  center  of this page and the transceiver will not respond to operator inputs. (a) SC   (single   channel)   mode.      The data at the top center of the page is: Top line -  2-FM SETUP Second    line    -    Currently    tuned    preset channel,    frequency,    and    plain/cipher    indication    plus identifier Third     line     - FAIL,    EMER,    or     TUNING    if appropriate 1 L1.      Successive   depressions   of   L1   will cause the mode to change from  SC to  FH to  FH/M, with the active mode boxed. 2    L5.  In SC mode, this function is a normal clock function. If   the   scratchpad   is   blank,   depressing   R5   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. 3 R1.      Successive   depressions   of   R1   will change  the  squelch  from   OFF to   ON,   with   the   active mode boxed. 4    R2.      Successive   depressions   of   R2   will cause    the    frequency    offset    for    the    selected    preset channel to change from 0 to +5 to +10 to -10 to -5, with the active offset boxed.  The offset selected for a preset channel is stored with that preset channel. NOTE When     the     EMER     switch     on     the keyboard  unit  (KU)  is  activated,  40.5 MHz  is  tuned,  squelch  is  set  to  ON, and   the   function   keys   on   the   2-FM AM/FM page are disabled. (b) FH     (frequency     hopping     mode). This mode is the member versus master/controller 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, the text NET, and the  NET number. Third  line  -  Displays   FAIL,  EMER,  TUNING,  or NO TSEC 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.  Second depressions of L1 will cause the mode to change from  SC to  FH to  FHIM, with the active mode boxed. NOTE If  a  TRANSEC  variable  has  not  been loaded, the text NO TSEC appears on the third line of text at the top center of the display. B L2.  The  ERF RCV key is used to initiate   reception   of   frequency   hopping   data   from   the NET controller's radio.  The received data is then stored in the member radio.  Depressing L2 causes the legend to be boxed.  If an ERF is received while the  ERF RCV mode  is  active,  the  text  at  L2  will  change  to   STORE HSET or STORE LSET, followed by the HSET or LSET data  that  was  received.    Depressing  L2  will  store  the LSET  in  its  channel  or  the    HSET  data  in  the  channel entered in the scratchpad (valid entry is I through 6) and added to the   HSET/LSET  list.    If  the  received  data  is bad,   the   text   BAD   is   displayed   next   to   L2.      If   the retrieval/storage  of  data  is  unsuccessful  for  some  other reason, the text ERROR is displayed. c  L3.    Function  key  L3  of  the  2-FM SETUP  page  (FH  format)  is  the   HSET  TUNE  function key.  This function key allows tuning of a hopset while on the   2-FM   SETUP    page.        Pressing    L3    with    a    valid channel number (1-6,  O or  M (O is processed the same as an  M))  that  contains  a  hopset  will  cause  the  radio  to be tuned to the entered channel.  If a channel number is entered which does not contain a valid hopset and L3 is pressed, a scratchpad error.  will occur. NOTE The   displayed   HSET   channel   is   the one that is used for LATE ENTRY. d L4.  The LSET CH key is used to display lockset  data  associated  with  a  particular  LSET  channel. If  the  scratchpad  is  empty,  depressing  L4  will  cause  the current displayed LSET channel and code to be blanked from     the     display.          If     a     valid LSET    channel     is scratchpadded, depressing L4 will cause the scratchpadded 3-17