TM 1-1510-218-10 3B-11 (a)   Direct    Frequency    Tuning    (Simplex Only). 1.     FREQ / CHAN switch – FREQ. 2.     Mode    –    Select    desired    mode, USB, LSB, or AM. 3.     Select  digit  to  be  changed  (outer knob), digit (cursor) will flash. 4.     Select    numerical    value    of    digit, inner knob. 5.     Stow  cursor,  or  repeat  procedure for additional changes. 6.     Tune antenna coupler, press microphone button. (3)   Channel  Programming.    There  are  three ways to set up a channel: Receive only, simplex, and semi-duplex. To gain access to channelized operation, press  FREQ  /  CHAN  button  to  the   CHAN position.  To utilize the existing programmed channels (i.e.  no  programming  required),  use  the  inner  control knob  to  select  the  desired  channel  number.    Then, momentarily  key  the  microphone  to  tune  the  antenna coupler.      If   channel   programming   is   required,   it   is necessary  to  activate  the  program  mode  as  follows.   With the FREQ / CHAN button in, use a pencil or other pointed object to push the  PGM button in.  The button is  an  alternate  action  switch,  push-on,  push-off.    The letters PGM will appear in the lower part of the display window  and  the  system  will  remain  in  the  program mode until the PGM button is pressed again. (a)   Receive Only. 1.   Stow the cursor if a frequency digit is flashing. 2.   Select the channel to be preset. 3.   Set  the  desired  operating  mode, LSB, USB or AM. 4.   Set  the  desired  frequency.    Refer to frequency tuning. 5.   Push    and    release    STO    button once. NOTE T will flash in the display window, however, a receive-only frequency is being set.  The flashing T should be ignored. If  another  channel  is  to  be  set,  the  cursor  must be stowed before a new channel can be selected.  Use the smaller concentric knob to select the channel and repeat the steps for selecting a new frequency. 6.     To  return  to  an  operating  mode, push the PGM button. (b)   Simplex.      Setting   a   channel   up   for simplex  operation  (receive  and  transmit  on  the  same frequency). 1.   FREQ   /   CHAN   –   CHAN,  cursor stowed. 2.   PGM button – In. 3.   Channel – Select. 4.   Mode – Set LSB, USB, or AM. 5.   Frequency – Set desired frequency.        Refer    to    frequency tuning. 6.   STO button   –  Push  and  release twice. The   first   press   of   the   STO   button   stores   the frequency in the receive position and the second press stores  the  same  frequency  in  the  transmit  position.   The  second  push  also  stores  the  cursor.    If  another channel is to be reset, use the smaller concentric knob to select the channel and repeat the steps for selecting a   new   frequency.      The   cursor   was   automatically stowed.    To  return  to  one  of  the  operating  modes, push the PGM button again. (c)   Semi-Duplex.    Setting  a  channel  for semi-duplex.    Transmit  on  one  frequency  and  receive on another. 1.   Channel   –  Select  channel  to  be preset. 2.  Frequency – Set desired frequency.      Refer   to   frequency selection. 3.  Mode – Set LSB, USB, or AM. 4.  STO button – Push once. 5.     Transmit frequency – Set. 6.     STO button – Push again.