§  25.281   Automatic Transmitter Identification System (ATIS).

   All satellite uplink transmissions carrying broadband video information
   shall be identified through the use of an automatic transmitter
   identification system as specified below.

   (a) Effective March 1, 1991, all satellite video uplink facilities
   shall be equipped with an ATIS encoder meeting the specifications set
   forth in paragraph (d) of this section.

   (b) All video uplink facilities utilizing a transmitter manufactured on
   or after March 1, 1991 shall be equipped with an ATIS encoder meeting
   the performance specifications set forth in paragraph (d) of this
   section and the encoder shall be integrated into the uplink transmitter
   chain in a method that cannot easily be defeated.

   (c) The ATIS signal shall be a separate subcarrier which is
   automatically activated whenever any RF emissions occur. The ATIS
   information shall continuously repeat.

   (d) The ATIS signal shall consist of the following:

   (1) A subcarrier signal generated at a frequency of 7.1 MHz +-25 KHz
   and injected at a level no less than -26 dB (referenced to the
   unmodulated carrier). The subcarrier deviation shall not exceed 25 kHz
   peak deviation.

   (2) The protocol shall be International Morse Code keyed by a 1200 Hz
   +-800 Hz tone representing a mark and a message rate of 15 to 25 words
   per minute. The tone shall frequency modulate the subcarrier signal.

   (3) The ATIS signal as a minimum shall consist of the following:

   (i) The FCC assigned earth station call sign;

   (ii) A telephone number providing immediate access to personnel capable
   of resolving ongoing interference or coordination problems with the
   station;

   (iii) A unique ten digit serial number of random number code programmed
   into the ATIS device in a permanent manner such that it cannot be
   readily changed by the operator on duty;

   (iv) Additional information may be included within the ATIS data stream
   provided the total message length, including ATIS, does not exceed 30
   seconds.

   [ 55 FR 21551 , May 25, 1990. Redesignated at  62 FR 5932 , Feb. 10, 1997]