§  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]