Sec.  80.217   Suppression of interference aboard ships.

   (a) A voluntarily equipped ship station receiver must not cause harmful
   interference to any receiver required by statute or treaty.

   (b) The electromagnetic field from receivers required by statute or treaty
   must not exceed the following value at a distance over sea water of one
   nautical mile from the receiver:


------------------------------------------------------------------------
                                                                 Field
                                                               intensity
             Frequency of interfering emissions                   in
                                                              microvolts
                                                               per meter
------------------------------------------------------------------------
Below 30 MHz................................................         0.1
30 to 100 MHz...............................................          .3
100 to 300 MHz..............................................         1.0
Over 300 MHz................................................         3.0
------------------------------------------------------------------------

   or

   Deliver not more than the following amounts of power, to an artificial
   antenna having electrical characteristics equivalent to those of the average
   receiving antenna(s) use on shipboard:


------------------------------------------------------------------------
                                                               Power to
                                                              artificial
             Frequency of interfering emissions               antenna in
                                                              microwatts
------------------------------------------------------------------------
Below 30 MHz................................................         400
30 to 100 MHz...............................................       4,000
100 to 300 MHz..............................................      40,000
Over 300 MHz................................................     400,000
------------------------------------------------------------------------