TM 1-1510-224-10 NOTE 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. (2) COMM control page.  The  COMM control page   shows   the   status   of   the    VHF-FM    and    has   a frequency list.  Radio name, mode of operation, selected channel    and    frequency    (or    hopset    number/AJ    NET number),   and   plain/   cipher   indications   are   presented. Two   arrows   indicate   which   transceiver   each   pilot   has selected   with   the   transmitter-intercom   selector   switch (audio control panel, fig.  3-1). NOT  INST  -   The   aircraft   is   configured   for   the equipment but it is not installed. FAIL - The equipment has failed. Blank - No  legend  at  the  bezel  switch  indicates that the aircraft is not configured for the equipment. NOTE The following definitions apply to the legend adjacent to the bezel switches: If  L1  line  selection  switch  is  depressed  with  the scratch-pad empty: The  FM  frequency  list  will  be  displayed  in  the box in the center of the multifunction display (MFD). The HOPSET/LOCKSET list will be displayed in the   box   in   the   center   of   the   MFD   if   the   frequency hopping mode is active. The legend at R4 will change to  FM FREQ. The legend at R5 will change to  2-FM SETUP. If    the    VHF-FM    transceiver    is    in    the    single channel mode and valid data is scratchpadded, depressing LI will cause  the  transceiver  to  be  returned  and  the  display  at LI to be updated to reflect the scratchpadded data.  Valid data is: A channel (1 through 20, or C or E). A  frequency  (30.000  to  87.975  with  leading  and trailing zeroes and decimal points optional). An identifier (1 through 6 alphanumeric characters,  beginning  with  an  alpha  but  excluding  E,  C, C plus 1 through 6, and P). Identifiers are valid only if they exist in the frequency list. If the VHF-FM is in the frequency hopping mode and   valid   data   is   scratchpadded,   depressing   L1   will cause  the  transceiver  to  be  returned  and  the  display  at L1 to be updated to reflect the scratchpadded data.  Valid data is: A HOPSET channel (0 through 6 or an M). A HOPSET number (3 digit number). An identifier (1 through 6 alphanumeric characters,  beginning  with  an  alpha  but  excluding  E,  C, C plus 1 through 6). HOPSET  and  identifier  entries  are  valid  only  if they exist in the hopset list. NOTE Hopset  channel  0  is  processed  and displayed as an M channel. 1    Displayed data at L1.    The  first  line of  text  at  LI  is  2-FM  followed  by  an  ICS  select  arrow  if the  radio  has  been  selected  by  the  transmitter-intercom selector  switch  (audio  control  panel,  fig.    3-1).    The  text CIPH  and  a  fill  number  is  displayed  to  the  right  of  the ICS select arrow if the cipher mode has been selected. The second line of text at L1 can read: Channel number/frequency followed by an optional identifier. E (for emergency)/l followed by 40.5, followed by an optional identifier. Net  channel  number/followed  by  a  FH  followed by the net number in the frequency hopping mode. M/  followed  by  a  frequency  if  the  radio  is  tuned to  a  frequency  list  or  if  the  cipher  fill  number/status  is changed after the radio is tuned. The  third  line  of  text  (LI)  may  contain  one  of  the following messages in the following priority: FAIL - The radio has failed one of several tests. EMER  -  The  emergency  tune  function  has  been selected using the KU EMER switch. TUNING   -   The   ARC-201   is   tuning   and   L1   is inoperative. NO  TSEC  -  The   FH or   FH/M  mode  is  selected  and  a TSEC   variable   has   not   been   stored   into   permanent memory. 3-16