Sec.  90.469   Unattended operation.

   (a) Subject to the provisions of  Sec.  Sec. 90.243, 90.245, and 90.247, mobile relay,
   fixed relay, and mobile repeater stations are authorized for unattended
   operation; and the transmitter control point requirements set out at
    Sec.  Sec. 90.463 through 90.465 shall not apply.

   (b) Self-activated transmitters may be authorized for unattended operation
   where they are activated by either electrical or mechanical devices,
   provided the licensee adopts reasonable means to guard against malfunctions
   and harmful interference to other users.

Internal Transmitter Control Systems