Restrictions on transmission
19.—(1)  The transmission of superfluous signals by a station or network is prohibited.
(2)  No test, trial or practical transmission shall be permitted except in such circumstances as to preclude the possibility of interference with any other station or network.
(3)  All tests, unless prior approval from the Authority has been obtained, shall be conducted on dummy load.
(4)  No person shall transmit —
(a)any message containing indecent, obscene or offensive language;
(b)any message for an improper or illegal purpose;
(c)any message which interferes with the operation of any authorised station or network; or
(d)any message which, to his knowledge is false or misleading and likely to prejudice the efficiency of any life-service or endanger the safety of any person or of a place or premises, vessel, aircraft or vehicle.
(5)  A licensee shall ensure that a station or network is worked in a manner which is safe and which does not impair or interfere with —
(a)any Armed Forces Communication; or
(b)the efficient and convenient working or maintenance of any other station or network, or telecommunication system or service in Singapore authorised by the Authority under the Act or these Regulations.
(6)  A licensee shall cease operating his station or network and shall take any other immediate action which the Authority stipulates as soon as it observes, or when it has been informed by the Authority or any other competent authority, that the working of his station or network causes interference to radio-communication.
(7)  The licensee shall, where so directed by the Authority in writing, cease to operate any or all of the equipment comprised in his station for such period or periods of time as may be required by the Authority for the purposes of investigation of interference to radio-communications.