
  SINGLE TONE

  This option Enables/Disables Single tone. This option, when enabled,
  allows the user to transmit a tone of selected frequency and duration.
  The singletone mode is entered by pressing and holding the RAT button
  (lower of two small buttons on the side of the radio).  The keypad is now
  in the singletone mode.  Pressing one of the keys on the keypad will cause
  the radio to go into transmit mode, emit a 1640 Hz side tone (if enabled)
  and transmit a singletone corresponding to the key pressed.
  NOTE: Singletone can only be enabled if SIGNALLING TYPE is set to NONE
  (Digital Signalling feature).


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  SINGLETONE SIDETONE

  This option Enable/Disables the sidetone during a singletone transmission.
  When enabled, a 1640 Hz sidetone is emitted, during the singletone
  transmission time, to alert the user that a singletone is being transmitted.








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  SINGLETONE TONE TYPE

  This feature has two choices: timed or continuous tone. If timed is
  selected, each time a singletone key is pressed, a singletone of a
  specified length will be transmitted.  The tone time is determined
  by the value in DURATION. If continuous is selected, the singletone
  will remain on as long as the key is pressed. The tone will stop as
  soon as the key is released.





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  SINGLETONE DURATION

  The singletone duration specifies the time, in milliseconds, that the
  singletone frequency is generated.  It may be directly entered using
  the numeric keys or scrolled using the up/down arrow keys. If the time
  is directly entered, it must be divisible by 142 ms.







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  SINGLETONE KEYS

  The singletone frequency may be directly entered using the numeric keys or
  scrolled using the up/down arrow keys.  If the frequency is directly
  entered, it will be rounded to the nearest possible frequency that can be
  generated. See Appendix I for singletone frequencies that can be generated.







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