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§ 73.401 47 CFR Ch. I (10–1–17 Edition)

Subpart C— must simulcast its analog audio pro- gramming on one of its digital audio programming streams. The DAB audio programming stream that is provided SOURCE: 72 FR 45692, Aug. 15, 2007, unless otherwise noted. pursuant to this paragraph must be at least comparable in sound quality to § 73.401 Scope. the analog programming service cur- rently provided to listeners. This subpart contains those rules (b) Emergency information. The which apply exclusively to the digital emergency information requirements audio broadcasting (DAB) service, and are in addition to those rules in Sub- found in § 73.1250 shall apply to all free parts A, B, C, G and H which apply to DAB programming streams. AM and FM broadcast services, both § 73.404 Interim hybrid IBOC DAB op- commercial and noncommercial. eration. § 73.402 Definitions. (a) The licensee of an AM or FM sta- tion, or the permittee of a new AM or (a) DAB. Digital audio broadcast sta- FM station which has commenced pro- tions are those stations licensed gram test operation pursuant to by the Commission and use the In-band On-channel (‘‘IBOC’’) system for broad- § 73.1620, may commence interim hybrid casting purposes. IBOC DAB operation with digital fa- (b) In Band On Channel DAB System. cilities which conform to the technical A technical system in which a station’s specifications specified for hybrid DAB digital signal is broadcast in the same operation in the First Report and Order spectrum and on the same channel as in MM Docket No. 99–325, as revised in its analog signal. the Media Bureau’s subsequent Order in (c) Hybrid DAB System. A system MM Docket No. 99–325. FM stations are which transmits both the digital and permitted to operate with hybrid dig- analog signals within the spectral ital effective radiated power equal to emission mask of a single AM or FM one percent (¥20 decibels below carrier channel. (dBc)) of authorized analog effective (d) Extended hybrid operation. An en- radiated power and may operate with hanced mode of FM IBOC DAB oper- up to ten percent (¥10 dBc) of author- ation which includes additional DAB ized analog effective radiated power in transmitted between the accordance with the procedures set analog FM signal and the inner edges forth in the Media Bureau’s Order in of the primary DAB . MM Docket No. 99–325. An AM or FM (e) Primary AM DAB Sidebands. The station may transmit IBOC signals two groups of hybrid AM IBOC DAB during all hours for which the station subcarriers which are transmitted 10 to is licensed to broadcast. 15 kHz above carrier (the (b) In situations where interference upper primary DAB ), and 10 to other stations is anticipated or ac- to 15 kHz below carrier frequency (the tually occurs, AM licensees may, upon lower primary DAB sideband). notification to the Commission, reduce (f) Multicasting. Subdividing the dig- the power of the primary DAB ital bitstream into multiple channels sidebands by up to 6 dB. Any greater for additional audio programming uses. reduction of sideband power requires (g) . Subdividing the dig- prior authority from the Commission ital bitstream into multiple channels via the filing of a request for special for additional data or information serv- temporary authority or an informal ices uses. letter request for modification of li- cense. § 73.403 Digital audio broadcasting (c) Hybrid IBOC AM stations must service requirements. use the same licensed main or auxil- (a) Broadcast radio stations using iary antenna to transmit the analog IBOC must transmit at least one over- and digital signals. the-air digital audio programming (d) FM stations may transmit hybrid stream at no direct charge to listeners. IBOC signals in combined mode; i.e., In addition, a broadcast radio station using the same antenna for the analog

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and digital signals; or may employ sep- § 1.1306(b) of this chapter. Any station arate analog and digital antennas. that cannot certify compliance must Where separate antennas are used, the submit an environmental assessment digital antenna: (‘‘EA’’) pursuant to § 1.1311 of this chap- (1) Must be a licensed auxiliary an- ter and may not commence IBOC oper- tenna of the station; ation until such EA is ruled upon by (2) Must be located within 3 seconds the Commission. latitude and longitude from the analog antenna; [72 FR 45692, Aug. 15, 2007, as amended at 75 (3) Must have a radiation center FR 17877, Apr. 8, 2010] height above average terrain between 70 and 100 percent of the height above Subpart D—Noncommercial average terrain of the analog antenna. Educational FM Broadcast Stations (e) Licensees must provide notifica- tion to the Commission in Washington, SOURCE: 28 FR 13651, Dec. 14, 1963, unless DC, within 10 days of commencing otherwise noted. Redesignated at 72 FR 45692, IBOC digital operation. The notifica- Aug. 15, 2007. tion must include the following infor- mation: § 73.501 Channels available for assign- (1) and facility identifica- ment. tion number of the station; (a) The following , except (2) Date on which IBOC operation as provided in paragraph (b) of this sec- commenced; tion, are available for noncommercial (3) Certification that the IBOC DAB educational FM broadcasting: facilities conform to permissible hy- brid specifications; Frequency (MHz) Channel (4) Name and telephone number of a No. technical representative the Commis- 87.9 ...... 1 200 sion can call in the event of inter- 88.1 ...... 201 ference; 88.3 ...... 202 (5) FM digital effective radiated 88.5 ...... 203 power used and certification that the 88.7 ...... 204 FM analog effective radiated power re- 88.9 ...... 205 2 mains as authorized; 89.1 ...... 206 89.3 ...... 207 (6) power output; if sepa- 89.5 ...... 208 rate analog and digital 89.7 ...... 209 are used, the power output for each 89.9 ...... 210 transmitter; 90.1 ...... 211 (7) If applicable, any reduction in an 90.3 ...... 212 AM station’s primary digital carriers; 90.5 ...... 213 (8) If applicable, the geographic co- 90.7 ...... 214 90.9 ...... 215 ordinates, elevation data, and license 91.1 ...... 216 file number of the auxiliary antenna 91.3 ...... 217 employed by an FM station as a sepa- 91.5 ...... 218 rate digital antenna; 91.7 ...... 219 (9) If applicable, for FM systems em- 91.9 ...... 220 ploying interleaved antenna bays, a 1 The frequency 87.9 MHz, Channel 200, is available only for use of existing Class D stations required to change fre- certification that adequate filtering quency. It is available only on a noninterference basis with re- and/or isolation equipment has been in- spect to TV Channel 6 stations and adjacent channel non- commercial educational FM stations. It is not available at all stalled to prevent spurious emissions within 402 kilometers (250 miles) of and 320 - in excess of the limits specified in meters (199 miles) of Mexico. The specific standards gov- § 73.317; erning its use are contained in § 73.512. 2 The frequency 89.1 MHz, Channel 206, in the New York (10) A certification that the oper- City metropolitan area, is reserved for the use of the United ation will not cause human exposure to Nations with the equivalent of an antenna height of 150 me- ters (492 feet) above average terrain and effective radiated levels of radiation in power of 20 kW and the Commission will make no assign- excess of the limits specified in § 1.1310 ments which would cause objectionable interference with such use. of this chapter and is therefore cat- egorically excluded from environ- (b) In Alaska, FM broadcast stations mental processing pursuant to operating on Channels 200–220 (87.9–91.9

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