Goto Section: 25.280 | 25.282 | Table of Contents

FCC 25.281
Revised as of October 1, 2016
Goto Year:2015 | 2017
  § 25.281   Transmitter identification requirements for video uplink

   (a) Earth-to-space transmissions carrying video information with analog
   modulation must be identified through use of an Automatic Transmitter
   Identification System (ATIS) with an analog identifier or a direct
   sequence spread spectrum signal.

   (1) Use of an analog identifier must be in accordance with the
   following requirements:

   (i) The ATIS signal must be a separate subcarrier that is automatically
   activated whenever any radio frequency signal is transmitted.

   (ii) The ATIS message must continuously repeat.

   (iii) The ATIS subcarrier signal must be generated at a frequency of
   7.1 MHz ±25 kHz and modulate the uplink radio frequency carrier at a
   level no less than −26 dB (referenced to the unmodulated carrier).

   (iv) ATIS subcarrier deviation must not exceed 25 kHz.

   (v) The ATIS message protocol must 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 must frequency-modulate the subcarrier
   signal with the ATIS message.

   (vi) The ATIS message must include the FCC-assigned call sign of the
   transmitting earth station, a telephone number providing immediate
   access to personnel capable of resolving interference or coordination
   problems, and a unique serial number of ten or more digits programmed
   into the ATIS message in a permanent manner so that it cannot be
   readily changed by the operator on duty. Additional information may be
   included in the ATIS data stream provided the total ATIS message length
   does not exceed 30 seconds.

   (2) Use of a direct sequence spread spectrum ATIS signal must be in
   accordance with the requirements in paragraphs (b)(1) and (2) of this

   (b) As of September 3, 2016, transmissions of fixed-frequency,
   digitally modulated video signals with a symbol rate of 128,000/s or
   more from Satellite News Gathering vehicles or other temporary-fixed
   earth stations must be identified through use of an ATIS in accordance
   with the following requirements:

   (1) The ATIS message must be modulated onto a direct sequence spread
   spectrum signal in accordance with the DVB-CID standard, ETSI TS 103
   129 (2013-05), “Technical Specification, Digital Video Broadcasting
   (DVB); Framing structure, channel coding and modulation of a carrier
   identification system (DVB-CID) for satellite transmission.” This
   document is incorporated by reference in accordance with 5 U.S.C.
   552(a) and 1 CFR part 51 and approved by the Director of the Federal
   Register. The ETSI document may be obtained from ETSI, 650 Route des
   Lucioles, 06921 Sophia Antipolis Cedex, France and by email to and a copy can be downloaded from You may inspect a copy at the Federal
   Communications Commission, 445 12th Street SW., Washington, DC 20554,
   or at the National Archives and Records Administration (NARA). For
   information on the availability of this material at NARA, call
   202-741-6030 or go to:

   (2) The ATIS message must continuously repeat.

   (c) ATIS equipment must be integrated into the uplink transmitter chain
   with a method that cannot easily be defeated.

   [ 79 FR 8325 , Feb. 12, 2014;  81 FR 33601 , May 31, 2016]

   return arrow Back to Top

Goto Section: 25.280 | 25.282

Goto Year: 2015 | 2017
CiteFind - See documents on FCC website that cite this rule

Want to support this service?

Report errors in this rule. Since these rules are converted to HTML by machine, it's possible errors have been made. Please help us improve these rules by clicking the Report FCC Rule Errors link to report an error.
Helping make public information public