& btmechfreqs()
 
  Syntax: btmechfreqs(<UnitDB>)
 
  This function returns a string containing the frequencies and 
  channelmodes set on <UnitDB>.
 
  The format of the string is <channelnumber>|<freq>|<mode>|<color>,
 
  <mode> returns:
  * a = Digital
  * b = Mute
  * c = Relay
  * d = Info
  * - = Analog 
 
  Error Messages:
  * If <UnitDB> is not a valid RS unit the function returns #-1 
    INVALID TARGET 

  Continued in btmechfreqs()2