Sec. 90.427  Precautions against unauthorized operation.

    (a) Each transmitter shall be so installed and protected that it is 
not accessible to or capable of operation by persons other than those 
duly authorized by and under the control of the licensee. Provisions of 
this part authorizing certain unlicensed persons to operate stations, or 
authorizing unattended operation of stations in certain circumstances, 
shall not be construed to change or diminish in any respect the 
responsibility of station licensees to maintain control over the 
stations licensed to them (including all transmitter units thereof), or 
for the proper functioning and operation of those stations and 
transmitter units in accordance with the terms of the licenses of those 
stations.
    (b) Except for frequencies used in accordance with Sec. 90.417, no 
person shall program into a transmitter frequencies for which the 
licensee using the transmitter is not authorized.
[ 43 FR 54791 , Nov. 22, 1978, as amended at  52 FR 47570 , Dec. 15, 1987]