  UNIT ID NUMBER


  Each radio within a system will have a unique 4 digit number associated
  with it referred to as the Unit ID, and is used to identify the portable
  at the base station.  This number is transmitted upon a change in state
  of the PTT.  The Unit ID Number range depends on the Signalling Type
  being used as follows:
      For MDC (600 or 1200):  0001 to DEEE (hexadecimal - excluding "F's"),
      For STAR (400 or 800)
          Portable:  0001 - 4095 (decimal) or
                     0001 - 8191 (decimal) (with a special decoder)
          Extended:  0001 - 9999 (decimal).
