TM 1-1520-218-10 3C-174 To  enter  the  preset  frequencies  into  the  preset lists, access the Preset pages from the Communication    page    and    laterally    scroll    to    the Frequency  Preset  or  Antijam  Preset  page.    Refer  to Figure  3C-126  and  Table  3C-88.    Access  the  Preset page by selecting the right line select key corresponding   to   the   preset   list   item   and   assign   a frequency and callsign to the preset list item. On  the  last  page  of  the  Antijam  presets,  select UPDT  CDU  AJ  PRESETS to reload ARC-210 Antijam presets  into  the  CDU  to  align  radio  and  CDU  preset lists. 1 Figure 3C-126.  Frequency and Antijam Preset Page Access and Usage Table 3C-88.  Frequency and Antijam Preset Page Access and Usage Procedure NO. DESCRIPTION/FUNCTION 1 To    access    the    presets    page(s)    and laterally  scroll  to  the  desired    preset  list page. 2 To   access   frequency   preset   page   to define preset. 3 Select to insert into scan list. 4 Select callsign for preset frequency. 5 Select    frequency    and    modulation    for preset. 6 Select  to  tune  to  preset  and  return  to communication page. (c)   Maritime     Channels.          To     use     a maritime channel, enter M and the channel number.  If the  transmit  frequency  is  to  be  the  coast  frequency associated   with   that   channel,   insert   a   C   after   the channel    number.        If    C    is    not    entered,    the    ship frequency  will  be used as the transmit frequency.  To switch     radio     tuning     between     ship     and     coastal frequencies,  enter  an   S  (ship)  or    C  (coast)  into  the CDU scratchpad and press the CHAN line select key. (d)   V/UHF   Scan   Function.      The   FMS- 800/ARC-210  provides  an  ability  to  continuously scan up  to  four  communications  frequencies  for  incoming signals.  To enable the ARC-210 scan function, access the V/UHF control page and toggle the SCAN mode to ON.      SCAN:   will   replace   the   callsign   field   of   the communication    page    and    the    frequency    field   will display the scan frequency. The radio will progressively   scan   through   each   of   the   four   scan frequencies   entered   on   the   V/UHF   scan   list   page.   When  the  radio  detects  a  signal  on  one  of  the  scan frequencies,   RECV:  will  be  displayed  as  long  as  a signal is detected.  The frequency on which the signal was  detected  will  be  displayed  in  the  frequency  field.   To   lock   onto   that   frequency,   press   the   RECV  line select  key  to  toggle  the  channel  to  LOCKX.    Repeat pressing  this  line  select  key  to  recall  former  locked scan  frequencies.    Up  to  three  scanning  frequencies can   be   recalled   as   locked   frequencies.      When   the oldest locked frequency is displayed, press the same line select key again to return the radio to scan mode. To    enter    the    frequencies    into    the    scan   list, access   the   preset   pages   from   the   Communication page and laterally scroll to the V/UHF Scan List page.   Refer  to  Figure  3C-127  and  Table  3C-89.    The  first scan frequency is the scan transmit frequency (i.e., the frequency  on  which  the  radio  will  transmit,  if  keyed while  scanning).    Access  the  Scan  Preset  page  by