47 CFR 80.213 - Modulation requirements.

§ 80.213 Modulation requirements.
(a) Transmitters must meet the following modulation requirements:
(1) When double sideband emission is used the peak modulation must be maintained between 75 and 100 percent;
(2) When phase or frequency modulation is used in the 156-162 MHz band the peak modulation must be maintained between 75 and 100 percent. A frequency deviation of ±5 kHz is defined as 100 percent peak modulation; and
(3) In single sideband operation the upper sideband must be transmitted. Single sideband transmitters must automatically limit the peak envelope power to their authorized operating power and meet the requirements in § 80.207(c).
(b) Radiotelephone transmitters using A3E, F3E and G3E emission must have a modulation limiter to prevent any modulation over 100 percent. This requirement does not apply to survival craft transmitters, to transmitters that do not require a license or to transmitters whose output power does not exceed 3 watts.
(c) Coast station transmitters operated in the 72.0-73.0 MHz and 75.4-76.0 MHz bands must be equipped with an audio low-pass filter. The filter must be installed between the modulation limiter and the modulated radio frequency stage. At frequencies between 3 kHz and 15 kHz it must have an attenuation greater than at 1 kHz by at least 40log10 (f/3) dB where “f” is the frequency in kilohertz. At frequencies above 15 kHz the attenuation must be at least 28 dB greater than at 1 kHz.
(d) Ship and coast station transmitters operating in the 156-162 MHz and 216-220 bands must be capable of proper operation with a frequency deviation that does not exceed ±5 kHz when using any emission authorized by § 80.207.
(e) Coast station transmitters operated in the 156-162 MHz band must be equipped with an audio low-pass filter. The filter must be installed between the modulation limiter and the modulated radio frequency stage. At frequencies between 3 kHz and 20 kHz it must have an attenuation greater than at 1 kHz by at least 60log10(f/3) dB where “f” is the audio frequency in kilohertz. At frequencies above 20 kHz the attenuation must be at least 50 dB greater than at 1 kHz.
(f) Radiodetermination ship stations operating on 154.585 MHz, 159.480 MHz, 160.725 MHz, 160.785 MHz, 454.000 MHz and 459.000 MHz must employ a duty cycle with a maximum transmission period of 60 seconds followed by a minimum quiescent period four times the duration of the transmission period.
(g) Radar stations operating in the bands above 2.4 GHz may use any type of modulation consistent with the bandwidth requirements in § 80.209(b).
(h) Radar transponder coast stations using the 2900-3100 MHz or 9300-9500 MHz band must operate in a variable frequency mode and respond on their operating frequencies with a maximum error equivalent to 100 meters. Additionally, their response must be encoded with a Morse character starting with a dash. The duration of a Morse dot is defined as equal to the width of a space and 1/3 of the width of a Morse dash. The duration of the response code must not exceed 50 microseconds. The sensitivity of the stations must be adjustable so that received signals below −10 dBm at the antenna will not activate the transponder. Antenna polarization must be horizontal when operating in the 9300-9500 MHz band and either horizontal or both horizontal and vertical when operating in the 2900-3100 MHz band. Racons using frequency agile transmitting techniques must include circuitry designed to reduce interference caused by triggering from radar antenna sidelobes.
(i) Variable frequency ship station transponders operating in the 2900-3100 MHz or 9300-9500 MHz band that are not used for search and rescue purposes must meet the following requirements:
(1) Non-selectable transponders must have the following characteristics:
(i) They must respond on all their frequencies with a maximum range error equivalent to 100 meters;
(ii) They must use a Morse encoding of “PS” (dot-dash-dash-dot, dot-dot-dot), meaning “You should not come any closer”. The width of a Morse dot is defined as equal to the width of a space and 1/3 of the width of a Morse dash;
(iii) When they employ swept frequency techniques they must not transmit on any frequency for more than 10 seconds in any 120 second period;
(iv) Any range offset of their response must occur during their pause on the fixed frequency;
(v) The duration of the response code must not exceed 50 microseconds;
(vi) The sensitivity of the stations must be adjustable so that received signals below −10 dBm at the antenna input will not activate the transponder;
(vii) Antenna polarization must be horizontal when operating in the 9300-9500 MHz band and either horizontal or both horizontal and vertical when operating in the 2900-3100 MHz band.
(viii) Transponders using frequency agile techniques must include circuitry designed to reduce interference caused by triggering from radar antenna sidelobes.
(2) Selectable transponders must be authorized under part 5 of the Commission's rules until standards for their use are developed.
(j) The transmitted signals of search and rescue transponders must cause to appear on a radar display a series of at least 20 equally spaced dots.
(k) The modulation requirements for EPIRB's are contained in subpart V.
[51 FR 31213, Sept. 2, 1986, as amended at 52 FR 7418, Mar. 11, 1987; 52 FR 28825, Aug. 4, 1987; 54 FR 40058, Sept. 29, 1989; 57 FR 43407, Sept. 21, 1992; 65 FR 77824, Dec. 13, 2000; 68 FR 46965, Aug. 7, 2003; 69 FR 64673, Nov. 8, 2004]

Title 47 published on 2013-10-01

no entries appear in the Federal Register after this date.

This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.

This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].

It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.


United States Code
U.S. Code: Title 47 - TELECOMMUNICATIONS

§ 151 - Purposes of chapter; Federal Communications Commission created

§ 152 - Application of chapter

§ 153 - Definitions

§ 154 - Federal Communications Commission

§ 155 - Commission

§ 301 - License for radio communication or transmission of energy

§ 302 - Repealed. June 5, 1936, ch. 511,

§ 302a - Devices which interfere with radio reception

§ 303 - Powers and duties of Commission

§ 303a - Standards for children’s television programming

§ 303b - Consideration of children’s television service in broadcast license renewal

§ 303c - Television program improvement

§ 304 - Waiver by license of claims to particular frequency or of electromagnetic spectrum

§ 305 - Government owned stations

§ 306 - Foreign ships; application of

§ 307 - Licenses

§ 308 - Requirements for license

§ 309 - Application for license

§ 310 - License ownership restrictions

§ 311 - Requirements as to certain applications in broadcasting service

§ 312 - Administrative sanctions

§ 312a - Revocation of operator’s license used in unlawful distribution of controlled substances

§ 313 - Application of antitrust laws to manufacture, sale, and trade in radio apparatus

§ 314 - Competition in commerce; preservation

§ 315 - Candidates for public office

§ 316 - Modification by Commission of station licenses or construction permits; burden of proof

§ 317 - Announcement of payment for broadcast

§ 318 - Transmitting apparatus; operator’s license

§ 319 - Construction permits

§ 320 - Stations liable to interfere with distress signals; designation and regulation

§ 321 - Distress signals and communications; equipment on vessels; regulations

§ 322 - Exchanging radio communications between land and ship stations and from ship to ship

§ 323 - Interference between Government and commercial stations

§ 324 - Use of minimum power

§ 325 - False, fraudulent, or unauthorized transmissions

§ 326 - Censorship

§ 327 - Naval stations; use for commercial messages; rates

§ 328 - Repealed.

§ 329 - Administration of radio laws in Territories and possessions

§ 330 - Prohibition against shipment of certain television receivers

§ 331 - Very high frequency stations and AM radio stations

§ 332 - Mobile services

§ 333 - Willful or malicious interference

§ 334 - Limitation on revision of equal employment opportunity regulations

§ 335 - Direct broadcast satellite service obligations

§ 336 - Broadcast spectrum flexibility

§ 337 - Allocation and assignment of new public safety services licenses and commercial licenses

§ 338 - Carriage of local television signals by satellite carriers

§ 339 - Carriage of distant television stations by satellite carriers

§ 340 - Significantly viewed signals permitted to be carried

§ 341 - Carriage of television signals to certain subscribers

§ 342 - Process for issuing qualified carrier certification

§ 351 - Ship radio stations and operations

§ 352 - Exemptions

§ 353 - Radio equipment and operators

§ 353a - Operators and watches on radiotelephone equipped ships

§ 354 - Technical requirements of equipment on radiotelegraph equipped ships

§ 354a - Technical requirements of equipment on radiotelephone equipped ships

§ 355 - Survival craft

§ 356 - Approval of installations by Commission

§ 357 - Safety information

§ 358 - Master’s control over operations

§ 359 - Certificates of compliance; issuance, modification, and cancellation

§ 360 - Station licenses; inspection of equipment by Commission

§ 361 - Control by Commission; review of decisions

§ 362 - Forfeitures; recovery

§ 363 - Automated ship distress and safety systems

§ 381 - Vessels transporting more than six passengers for hire required to be equipped with radiotelephone

§ 382 - Vessels excepted from radiotelephone requirement

§ 383 - Exemptions by Commission

§ 384 - Authority of Commission; operations, installations, and additional equipment

§ 385 - Inspections

§ 386 - Forfeitures

§ 390 - Declaration of purpose

§ 391 - Authorization of appropriations

§ 392 - Grants for construction

§ 392a - Repealed.

§ 393 - Criteria for approval and expenditures by Secretary

§ 393a - Long-range planning for facilities

§ 394 - Establishment of National Endowment

§ 395 - Assistance for demonstration projects

§ 396 - Corporation for Public Broadcasting

§ 397 - Definitions

§ 398 - Federal interference or control

§ 399 - Support of political candidates prohibited

§ 399a - Use of business or institutional logograms

§ 399b - Offering of certain services, facilities, or products by public broadcast station

§ 401 - Enforcement provisions

§ 402 - Judicial review of Commission’s orders and decisions

§ 403 - Inquiry by Commission on its own motion

§ 404 - Reports of investigations

§ 405 - Petition for reconsideration; procedure; disposition; time of filing; additional evidence; time for disposition of petition...reconsideration of order concluding hearing or investigation; appeal of order

§ 406 - Compelling furnishing of facilities; mandamus; jurisdiction

§ 407 - Order for payment of money; petition for enforcement; procedure; order of Commission as prima facie evidence; costs; attorneys’ fees

§ 408 - Order not for payment of money; when effective

§ 409 - Hearings

§ 410 - Joint boards and commissions

§ 411 - Joinder of parties

§ 412 - Documents filed with Commission as public records; prima facie evidence; confidential records

§ 413 - Designation of agent for service; method of service

§ 414 - Exclusiveness of chapter

§ 415 - Limitations of actions

§ 416 - Orders of Commission

§ 501 - General penalty

§ 502 - Violation of rules, regulations, etc.

§ 503 - Forfeitures

§ 504 - Forfeitures

§ 505 - Venue of trials

§ 506 - Repealed.

§ 507 - Violation of Great Lakes Agreement

§ 508 - Disclosure of payments to individuals connected with broadcasts

§ 509 - Prohibited practices in contests of knowledge, skill, or chance

§ 510 - Forfeiture of communications devices

§ 521 - Purposes

§ 522 - Definitions

§ 531 - Cable channels for public, educational, or governmental use

§ 532 - Cable channels for commercial use

§ 533 - Ownership restrictions

§ 534 - Carriage of local commercial television signals

§ 535 - Carriage of noncommercial educational television

§ 536 - Regulation of carriage agreements

§ 537 - Sales of cable systems

§ 541 - General franchise requirements

§ 542 - Franchise fees

§ 543 - Regulation of rates

§ 544 - Regulation of services, facilities, and equipment

§ 544a - Consumer electronics equipment compatibility

§ 545 - Modification of franchise obligations

§ 546 - Renewal

§ 547 - Conditions of sale

§ 548 - Development of competition and diversity in video programming distribution

§ 549 - Competitive availability of navigation devices

§ 551 - Protection of subscriber privacy

§ 552 - Consumer protection and customer service

§ 553 - Unauthorized reception of cable service

§ 554 - Equal employment opportunity

§ 555 - Judicial proceedings

§ 555a - Limitation of franchising authority liability

§ 556 - Coordination of Federal, State, and local authority

§ 557 - Existing franchises

§ 558 - Criminal and civil liability

§ 559 - Obscene programming

§ 560 - Scrambling of cable channels for nonsubscribers

§ 561 - Scrambling of sexually explicit adult video service programming

§ 571 - Regulatory treatment of video programming services

§ 572 - Prohibition on buy outs

§ 573 - Establishment of open video systems

§ 601 - Interstate Commerce Commission and Postmaster General; duties, powers, and functions transferred to Commission

§ 602, 603 - Repealed.

§ 604 - Effect of transfer

§ 605 - Unauthorized publication or use of communications

§ 606 - War powers of President

§ 607 - Effective date of chapter

§ 608 - Separability

§ 609 - Short title

Statutes at Large