  PRETIME


  The Pretime is the amount of time the clear carrier is sent out before
  the data packet is sent out.  This feature is enabled on all radios, and
  a pretime length must be selected.  The Pretime length should be greater
  than the access time of the system in which the radio will be used.  The
  choices range from 100 ms to 2500 ms in 10 ms increments.  Pretimes which
  are generally considered standard are 300ms, 500ms, and 750ms.
