Sec.  5.111   General limitations on use.

   (a) The following transmission limitations are applicable to all classes of
   stations in the Experimental Radio Service:

   (1) Stations may make only such transmissions as are necessary and directly
   related to the conduct of the licensee's stated program of experimentation
   as  specified  in  the application for license and the related station
   instrument of authorization, and as governed by the provisions of the rules
   and regulations contained in this part. All transmissions shall be limited
   to the minimum practical transmission time.

   (2) When transmitting, the licensee must use every precaution to ensure that
   the radio frequency energy emitted will not cause harmful interference to
   the services carried on by stations operating in accordance with the Table
   of Frequency Allocations of part 2 of this chapter and, further, that the
   power radiated is reduced to the lowest practical value consistent with the
   program of experimentation for which the station authorization is granted.
   If  harmful interference to an established radio service develops, the
   licensee shall cease transmissions and such transmissions shall not be
   resumed until it is certain that harmful interference will not be caused.

   (b) If experimental stations are to be used to retransmit signals of any
   other station or to render any communications service to third parties, a
   full disclosure of this must be made in the application for license.