Sec.  97.311   SS emission types.

   (a) SS emission transmissions by an amateur station are authorized only for
   communications between points within areas where the amateur service is
   regulated by the FCC and between an area where the amateur service is
   regulated by the FCC and an amateur station in another country that permits
   such communications. SS emission transmissions must not be used for the
   purpose of obscuring the meaning of any communication.

   (b) A station transmitting SS emissions must not cause harmful interference
   to stations employing other authorized emissions, and must accept all
   interference caused by stations employing other authorized emissions.

   (c) When deemed necessary by a District Director to assure compliance with
   this part, a station licensee must:

   (1) Cease SS emission transmissions;

   (2) Restrict SS emission transmissions to the extent instructed; and

   (3) Maintain a record, convertible to the original information (voice, text,
   image, etc.) of all spread spectrum communications transmitted.

   (d) The transmitter power must not exceed 100 W under any circumstances. If
   more than 1 W is used, automatic transmitter control shall limit output
   power to that which is required for the communication. This shall be
   determined by the use of the ratio, measured at the receiver, of the
   received energy per user data bit (Eb) to the sum of the received power
   spectral densities of noise (N[0]) and co-channel interference (I[0]).
   Average transmitter power over 1 W shall be automatically adjusted to
   maintain an Eb/ (N[0] + I[0]) ratio of no more than 23 dB at the intended
   receiver.

   [ 64 FR 51471 , Sept. 23, 1999]