TM 55-1510-221-10 NOTE ch digit of the frequency may be selected instead  of  dialing  up  or  down  to  a  fre- quency.   The   larger   concentric   knob   is used  to  select  the  digit  to  be  changed. This digit will flash when selected. Rota- tion  of  the  knob  moves  the  flashing  cursor in  the  direction  of  rotation.  After  the  digit to  be  changed  is  flashing,  the  smaller  con- centric knob is used to select the numeral desired.  This  process  is  repeated  until  the new  frequency  has  been  selected.  The flashing  cursor  may  then  be  stowed  by moving  it  to  the  extreme  left  or  right  of the display and then one more click. This stows the cursor behind the display until needed again. The cursor may be recalled by  turning  the  concentric  knob  one  click left  or  right. (3.)   Direct   frequency   tuning   (Simplex only). 1. FREQ/CHAN button out (FREQ). 2.  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). (4.)  Channel  Programming. NOTE There are three ways to set up a channel: Receive  only,  simplex,  and  semi-duplex. To  gain  access  to  channelized  operation, depress  FREQ/CHAN  button.  To  utilize the  existing  programmed  channels  (i.e.  no programming  required)  use  the  small  con- trol  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 (CHAN), 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. (5.)  Receiver  operating  procedure: 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, how- ever a receive only frequency is being set. The flashing "T" should be ignored. NOTE 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. (a.)  Simplex  operation:  Setting   a channel  up  for  simplex  operation  (receive  and  trans- mit on the same 1. 2. 3. 4. 5. 6. frequency). FREQ/CHAN   button   in   (cursor stowed). PGM button in (PGM displayed). Select channel to be preset. Set mode (LSB,USB or AM). Set  desired  frequency.  (Refer  to frequency  tuning) Push  and  release  STO  button twice. The first press of the STO button stores the fre- quency 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 3-17