40.—(1) Messages transmitted through an Amateur Station shall be in plain language and shall relate solely to the licensee’s experiments or personal affairs (not being business affairs), or to the personal affairs of the person with whom the licensee is communicating.
(2) An Amateur Station shall not be used for transmitting news, advertisements, communications of a business or non-experimental character, messages for pecuniary reward or messages for or on behalf of a third party.
(3) Except with the written permission of the Authority, no licensee of an Amateur Station shall call or transmit to any station other than an Amateur Station.
(4) Messages may only be exchanged with another Amateur Station, except where prohibited by law.
(5) Transmission shall not commence without listening in on the frequency to be used in order to ascertain that no interference is likely to be caused to any other station which may be functioning.