FCC Web Documents citing 73.609

as compiled by hallikainen.com/FccRules on 2012 07 01

• http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-01-330A1.doc http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-01-330A1.pdf
  • supra n. 55. See DTV Sixth Report and Order, 12 FCC Rcd 14588, ¶ 213 (1997). The power limits depend on the antenna height above average terrain (HAAT), the channel band (low VHF channels 2-6, high VHF channels 7-13 or UHF channels 14-69), and zone or area of the country within which the station is located (as defined in Section 73.609 of the Commission's rules). See Report and Order at ¶¶ 73-74 and Section 73.622(f)(5) of the Commission's Rules. Petition for Reconsideration and Clarification of APTS and PBS at 6, n.16. Petition for Reconsideration of Red River at 5. See 5 U.S.C. § 601 et. seq. See 5 U.S.C. § 603. The RFA, see 5 U.S.C. § 601 et seq., has
• http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-05-192A1.doc http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-05-192A1.pdf http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-05-192A1.txt
  • contained. In the vast majority of cases, the appropriate circle will equal or exceed a station's currently authorized coverage contour, including the contour within which the station certified it will provide service at the end of the transition. The rule proposed will provide for those exceptional situations in which this is not the case. Channel Zone (see 47 C.F.R. § 73.609) F(50,90) field strength ERP at HAAT Distance 2-6 1 28 dBu 10 kW at 305 m. 108 km. (67 mi.) 2-6 2 and 3 28 dBu 10 kW at 610 m. 128 km. (80 mi.) 7-13 1 36 dBu 30 kW at 305 m. 101 km. (63 mi.) 7-13 2 and 3 36 dBu 30 kW at 610 m. 123
• http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-08-256A1.doc http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-08-256A1.pdf http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-08-256A1.txt
  • contours must be contained. In the vast majority of cases, the appropriate circle will equal or exceed a station's currently authorized coverage contour, including the contour within which the station will provide service at the end of the transition. The rule will provide for those exceptional situations in which this is not the case. Channel Zone (see 47 C.F.R. § 73.609) F(50,90) field strength Distance from reference point 2-6 1 28 dBu 108 km. (67 mi.) 2-6 2 and 3 28 dBu 128 km. (80 mi.) 7-13 1 36 dBu 101 km. (63 mi.) 7-13 2 and 3 36 dBu 123 km. (77 mi.) 14-51 1, 2 and 3 41 dBu 103 km. (64 mi.) Waiver policy. We adopt a waiver
• http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-08-281A1.doc http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-08-281A1.pdf http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-08-281A1.txt
  • DTV station. Meeting these measures, which vary by channel band and Zone, would establish a presumption that analog stations that are located the specified distance or greater from any operating DTV stations would not cause interference to signals in the digital television service. The minimum spacing measures used in developing this list are: Channel Band Zone (see 47 C.F.R. § 73.609) Co-Channel Minimum Spacing Adjacent Channel Minimum Spacing 2-6 (Low-VHF) 1 302 km (188 miles) 131 km (81 miles) 2-6 (Low-VHF) 2 and 3 344 km (214 miles) 156 km (97 miles) 7-13 (High-VHF) 1 264 km (164 miles) 118 km (73 miles) 7-13 (High-VHF) 2 and 3 308 km (191miles) 149 km (93 miles) 14-51 (UHF) 1, 2 and 3
• http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-09-2A1.doc http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-09-2A1.pdf http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-09-2A1.txt
  • calculate DTV service areas and 2) the analog maximum power and antenna height standards in Section 73.614 of the rules, 47 C.F.R. § 73.614, and the F(50,10) curves in Section 73.699 to calculate analog interference potential. Id. at § 73.699. The minimum spacing measures used in developing the Notice Appendix A list were: Channel Band Zone (see 47 C.F.R. § 73.609) Co-Channel Minimum Spacing Adjacent Channel Minimum Spacing 2-6 (Low-VHF) 1 302 km (188 miles) 131 km (81 miles) 2-6 (Low-VHF) 2 and 3 344 km (214 miles) 156 km (97 miles) 7-13 (High-VHF) 1 264 km (164 miles) 118 km (73 miles) 7-13 (High-VHF) 2 and 3 308 km (191miles) 149 km (93 miles) 14-51 (UHF) 1, 2 and 3
• http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-10-16A1.doc http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-10-16A1.pdf http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-10-16A1.txt
  • 15.238 added to read as follows: § 15.238 Operation in the bands 54-72 MHz, 76-88 MHz, 174-216 MHz, 470-608 MHz and 614-698 MHz. (a) Operation under this section is limited to wireless audio devices as defined in § 15.3(hh). (b) Operation is limited to locations removed from existing co-channel TV broadcast stations by not less than the following distances. See §73.609 for zone definitions. (1) 54.000-72.000 MHz and 76.000-88.000 MHz: Zone I 105 km (65 miles) Zones II and III 129 km (80 miles) (2) 174.000-216.000 MHz Zone I 97 km (60 miles) Zones II and III 129 km (80 miles) (3) 470.000-608.000 MHz and 614.000-698.000 MHz. All zones 113 km (70 miles) (c) Specific frequency operation is required as follows.
• http://transition.fcc.gov/Bureaus/Engineering_Technology/Orders/1997/fc97115a.pdf http://transition.fcc.gov/Bureaus/Engineering_Technology/Orders/1997/fc97115a.wp
  • ChannelRelationship SeparationRequirement _______________________________________________________________ VHFChannels2-13 Co-channel,DTVtoDTV ZoneI 244.6km ZonesII&III 273.6km Co-channel,DTVtoanalogTVZoneI 244.6km ZoneII&III 273.6km AdjacentChannel DTVtoDTV Noallotmentspermittedbetween: ZoneI 40.2kmand96.6km ZonesII&III 48.3kmand96.6km DTVtoanalogTV Noallotmentspermittedbetween: ZoneI 11.3kmand114.3km ZoneII&III 17.7kmand146.4km UHFChannels Co-channel,DTVtoDTV ZoneI 196.3km ZoneII&III 223.7km E-34 Co-channel,DTVtoanalogTVZoneI 217.3km ZoneII&III 244.6km AdjacentChannel DTVtoDTV Noallotmentspermittedbetween: AllZones 32.2kmand88.5km DTVtoanalogTV Noallotmentspermittedbetween: AllZones 9.7kmand88.5km TabooChannels,DTVtoanalogTVonly (DTVchannels+/-2,+/-3,+/-4, +/-7,+/-8,and14or15channels abovetheanalogTVchannel) Noallotmentspermittedbetween: ZoneI 24.1kmand80.5km ZoneII&III 24.1kmand96.6km _______________________________________________________________ Notetoparagraph(d)(1):DuetothefrequencyspacingthatexistsbetweenChannels 4and5,betweenChannels6and7,andbetweenChannels13and14,theminimum geographicspacingrequirementsspecifiedaboveshallnotbeapplicabletothesepairs ofchannels(seesection73.603(a)). (2)Zonesaredefinedinsection73.609.TheminimumdistanceseparationbetweenaDTV stationinonezoneandananalogTVorDTVstationinanotherzoneshallbethatofthe zonerequiringthelowerseparation. (e)Protectionoflandmobileoperationsonchannels14-20.TheCommissionwillnot acceptpetitionstoamendtheDTVTableofAllotments,applicationsfornewDTVstations, orapplicationstochangethechannelorlocationofauthorizedDTVstationsthatwoulduse channels14-20wherethedistancebetweentheDTVreferencepointasdefinedinsection 73.622(d),wouldbelocatedlessthan250kmfromthecitycenterofaco-channelland mobileoperationor176kmfromthecitycenterofanadjacentchannellandmobile operation.Landmobileoperationsonthesechannelsinthefollowingmarkets: City Channels Latitude Longitude Boston,MA 14,16 42º21'24" 71º03'25" Chicago,IL 14,15 41º52'28" 87º38'22" Dallas,TX 16 32º47'09" 96º47'37" Houston,TX 17 29º45'26" 95º21'37" LosAngeles,CA 14,16,2034º03'15"118º14'28" Miami,FL 14 25º46'37" 80º11'32" NewYork,NY 14,15 40º45'06" 73º59'39" Philadelphia,PA 19,20 39º56'58" 75º09'21" Pittsburgh,PA 14,18 40º26'19" 80º00'00" SanFrancisco,CA 16,17 37º46'39"122º24'40" Washington,D.C. 17,18 38º53'51" 77º00'33" E-35 (f)Negotiatedagreementsoninterference.Notwithstandingtheminimumtechnicalcriteria forDTVallotmentsspecifiedabove,DTVstationsoperatingonallotmentsthatareincluded intheinitialDTVTablemayoperatewithincreasedERPand/orantennaHAATthatwould resultinadditionalinterferencetoananalogTVstationifthatstationagrees,inwriting,to accepttheadditionalinterference.Suchagreementsmustbesubmittedwiththeapplication
• http://transition.fcc.gov/Bureaus/Engineering_Technology/Orders/1998/fc98024a.pdf http://transition.fcc.gov/Bureaus/Engineering_Technology/Orders/1998/fc98024a.txt http://transition.fcc.gov/Bureaus/Engineering_Technology/Orders/1998/fc98024a.wp
  • Zones 12 km and 106 km Taboo Channels, DTV to analog TV only (DTV channels +/- 2, +/- 3, +/- 4, +/- 7, +/- 8, and 14 or 15 channels above the analog TV channel) No allotments permitted between: Zone I 24.1 km and 80.5 km Zone II & III24.1 km and 96.6 km (2) Zones are defined in section 73.609. The minimum distance separation between a DTV station in one zone and an analog TV or DTV station in another zone shall be that of the zone requiring the lower separation. E-40 (3) Due to the frequency spacing that exists between Channels 4 and 5, between Channels 6 and 7, and between Channels 13 and 14, the minimum geographic spacing
• http://transition.fcc.gov/Bureaus/Mass_Media/Orders/2001/fcc01330.pdf http://transition.fcc.gov/Bureaus/Mass_Media/Orders/2001/fcc01330.txt
  • near future. 92 See DTV Sixth Report and Order, 12 FCC Rcd 14588, ¶ 213 (1997). The power limits depend on the antenna height above average terrain (HAAT), the channel band (low VHF channels 2-6, high VHF channels 7-13 or UHF channels 14-69), and zone or area of the country within which the station is located (as defined in Section 73.609 of the Commission's rules). 93 See Report and Order at ¶¶ 73-74 and Section 73.622(f)(5) of the Commission's Rules. 94 Petition for Reconsideration and Clarification of APTS and PBS at 6, n.16. 95 Petition for Reconsideration of Red River at 5. Federal Communications Commission FCC 01-330 25 IV. CONCLUSION 69. In this Memorandum Opinion and Order on Reconsideration, we revise
• http://transition.fcc.gov/Bureaus/Mass_Media/Public_Notices/TV_Notices/pnmm8116.pdf http://transition.fcc.gov/Bureaus/Mass_Media/Public_Notices/TV_Notices/pnmm8116.txt http://transition.fcc.gov/Bureaus/Mass_Media/Public_Notices/TV_Notices/pnmm8116.wp
  • NTSC TV stations within 217.3 km if either the NTSC or the 11 See Order at para. 146. A broadcaster otherwise seeking to change its allotted DTV channel must petition the Commission for rule making to amend the DTV Allotment Table. See Section 73.622(a) of the Commission's Rules. -10- DTV application site is in TV Zone I (defined in Section 73.609, but generally the portion of the northeastern U.S. containing the largest cities), co-channel NTSC TV stations within 244.6 km if neither the NTSC nor the DTV application site is in TV Zone I, broadcasters with co-channel DTV stations or allotments within 196.3 km if either the DTV station or the DTV application site is in TV Zone I, and within
• http://transition.fcc.gov/fcc-bin/audio/amfmrule.html
  • 73.597 FM stereophonic sound broadcasting. [281]TEXT [282]PDF 73.599 NCE-FM engineering charts. [ [283]Section 73.599 graphs ] Subpart E -- Television Broadcast Stations [284]TEXT [285]PDF 73.601 Scope of subpart. [286]TEXT [287]PDF 73.602 Cross reference to rules in other parts. [288]TEXT [289]PDF 73.603 Numerical designation of television channels. [290]TEXT [291]PDF 73.606 Table of allotments. [292]TEXT [293]PDF 73.607 Availability of channels. [294]TEXT [295]PDF 73.609 Zones. [296]TEXT [297]PDF 73.610 Minimum distance separations between stations. [298]TEXT [299]PDF 73.611 Reference points and distance computations. [300]TEXT [301]PDF 73.612 Protection from interference. [302]TEXT [303]PDF 73.613 Protection of Class A TV stations. [304]TEXT [305]PDF 73.614 Power and antenna height requirements. [306]TEXT [307]PDF 73.615 Administrative changes in authorizations. [308]TEXT [309]PDF 73.616 Post-transition DTV station interference protection. [310]TEXT [311]PDF 73.621 Noncommercial educational
• http://www.fcc.gov/Bureaus/Engineering_Technology/Notices/1996/fcc96317.pdf
  • Allotments. B. Methodology for Allotting DTV Frequencies See Second Further Notice, at paras. 25-30; see also 47 CFR §§73.207 and 73.610. 83 We note that our replication proposal automatically takes into account station differences 84 resulting from the different spacing standards in Zones I, II and III. The use of Zones in allotting TV broadcast channels is described in Sections 73.609 and 73.610 of the rules, see 47 CFR §§73.609 and .610. A description of the propagation models and service area planning factors are included 85 with the system performance data in Appendix A. The degree to which television stations interfere with one another depends in part on 86 the ability of TV receivers to reject undesired signals in favor of
• http://www.fcc.gov/Bureaus/Engineering_Technology/Orders/1997/fc97115a.pdf http://www.fcc.gov/Bureaus/Engineering_Technology/Orders/1997/fc97115a.wp
  • ChannelRelationship SeparationRequirement _______________________________________________________________ VHFChannels2-13 Co-channel,DTVtoDTV ZoneI 244.6km ZonesII&III 273.6km Co-channel,DTVtoanalogTVZoneI 244.6km ZoneII&III 273.6km AdjacentChannel DTVtoDTV Noallotmentspermittedbetween: ZoneI 40.2kmand96.6km ZonesII&III 48.3kmand96.6km DTVtoanalogTV Noallotmentspermittedbetween: ZoneI 11.3kmand114.3km ZoneII&III 17.7kmand146.4km UHFChannels Co-channel,DTVtoDTV ZoneI 196.3km ZoneII&III 223.7km E-34 Co-channel,DTVtoanalogTVZoneI 217.3km ZoneII&III 244.6km AdjacentChannel DTVtoDTV Noallotmentspermittedbetween: AllZones 32.2kmand88.5km DTVtoanalogTV Noallotmentspermittedbetween: AllZones 9.7kmand88.5km TabooChannels,DTVtoanalogTVonly (DTVchannels+/-2,+/-3,+/-4, +/-7,+/-8,and14or15channels abovetheanalogTVchannel) Noallotmentspermittedbetween: ZoneI 24.1kmand80.5km ZoneII&III 24.1kmand96.6km _______________________________________________________________ Notetoparagraph(d)(1):DuetothefrequencyspacingthatexistsbetweenChannels 4and5,betweenChannels6and7,andbetweenChannels13and14,theminimum geographicspacingrequirementsspecifiedaboveshallnotbeapplicabletothesepairs ofchannels(seesection73.603(a)). (2)Zonesaredefinedinsection73.609.TheminimumdistanceseparationbetweenaDTV stationinonezoneandananalogTVorDTVstationinanotherzoneshallbethatofthe zonerequiringthelowerseparation. (e)Protectionoflandmobileoperationsonchannels14-20.TheCommissionwillnot acceptpetitionstoamendtheDTVTableofAllotments,applicationsfornewDTVstations, orapplicationstochangethechannelorlocationofauthorizedDTVstationsthatwoulduse channels14-20wherethedistancebetweentheDTVreferencepointasdefinedinsection 73.622(d),wouldbelocatedlessthan250kmfromthecitycenterofaco-channelland mobileoperationor176kmfromthecitycenterofanadjacentchannellandmobile operation.Landmobileoperationsonthesechannelsinthefollowingmarkets: City Channels Latitude Longitude Boston,MA 14,16 42º21'24" 71º03'25" Chicago,IL 14,15 41º52'28" 87º38'22" Dallas,TX 16 32º47'09" 96º47'37" Houston,TX 17 29º45'26" 95º21'37" LosAngeles,CA 14,16,2034º03'15"118º14'28" Miami,FL 14 25º46'37" 80º11'32" NewYork,NY 14,15 40º45'06" 73º59'39" Philadelphia,PA 19,20 39º56'58" 75º09'21" Pittsburgh,PA 14,18 40º26'19" 80º00'00" SanFrancisco,CA 16,17 37º46'39"122º24'40" Washington,D.C. 17,18 38º53'51" 77º00'33" E-35 (f)Negotiatedagreementsoninterference.Notwithstandingtheminimumtechnicalcriteria forDTVallotmentsspecifiedabove,DTVstationsoperatingonallotmentsthatareincluded intheinitialDTVTablemayoperatewithincreasedERPand/orantennaHAATthatwould resultinadditionalinterferencetoananalogTVstationifthatstationagrees,inwriting,to accepttheadditionalinterference.Suchagreementsmustbesubmittedwiththeapplication
• http://www.fcc.gov/Bureaus/Engineering_Technology/Orders/1998/fc98024a.pdf http://www.fcc.gov/Bureaus/Engineering_Technology/Orders/1998/fc98024a.txt http://www.fcc.gov/Bureaus/Engineering_Technology/Orders/1998/fc98024a.wp
  • Zones 12 km and 106 km Taboo Channels, DTV to analog TV only (DTV channels +/- 2, +/- 3, +/- 4, +/- 7, +/- 8, and 14 or 15 channels above the analog TV channel) No allotments permitted between: Zone I 24.1 km and 80.5 km Zone II & III24.1 km and 96.6 km (2) Zones are defined in section 73.609. The minimum distance separation between a DTV station in one zone and an analog TV or DTV station in another zone shall be that of the zone requiring the lower separation. E-40 (3) Due to the frequency spacing that exists between Channels 4 and 5, between Channels 6 and 7, and between Channels 13 and 14, the minimum geographic spacing
• http://www.fcc.gov/Bureaus/Mass_Media/Orders/2001/fcc01330.pdf http://www.fcc.gov/Bureaus/Mass_Media/Orders/2001/fcc01330.txt
  • near future. 92 See DTV Sixth Report and Order, 12 FCC Rcd 14588, ¶ 213 (1997). The power limits depend on the antenna height above average terrain (HAAT), the channel band (low VHF channels 2-6, high VHF channels 7-13 or UHF channels 14-69), and zone or area of the country within which the station is located (as defined in Section 73.609 of the Commission's rules). 93 See Report and Order at ¶¶ 73-74 and Section 73.622(f)(5) of the Commission's Rules. 94 Petition for Reconsideration and Clarification of APTS and PBS at 6, n.16. 95 Petition for Reconsideration of Red River at 5. Federal Communications Commission FCC 01-330 25 IV. CONCLUSION 69. In this Memorandum Opinion and Order on Reconsideration, we revise
• http://www.fcc.gov/Bureaus/Mass_Media/Public_Notices/TV_Notices/pnmm8116.pdf http://www.fcc.gov/Bureaus/Mass_Media/Public_Notices/TV_Notices/pnmm8116.txt http://www.fcc.gov/Bureaus/Mass_Media/Public_Notices/TV_Notices/pnmm8116.wp
  • NTSC TV stations within 217.3 km if either the NTSC or the 11 See Order at para. 146. A broadcaster otherwise seeking to change its allotted DTV channel must petition the Commission for rule making to amend the DTV Allotment Table. See Section 73.622(a) of the Commission's Rules. -10- DTV application site is in TV Zone I (defined in Section 73.609, but generally the portion of the northeastern U.S. containing the largest cities), co-channel NTSC TV stations within 244.6 km if neither the NTSC nor the DTV application site is in TV Zone I, broadcasters with co-channel DTV stations or allotments within 196.3 km if either the DTV station or the DTV application site is in TV Zone I, and within
• http://www.fcc.gov/Forms/Form301/301.pdf
  • C.F.R. Section 73.626 of the rules. Table of Distances. The following Table of Distances describes (by channel and zone) a station's maximum service area that can be obtained in applying for a DTS authorization. See 47 C.F.R. Section 73.626(c). The distances represent circles within which DTS station coverage contours must be contained. 20 Channe l Zone (see 47 C.F.R. Section 73.609) F(50,90) field strengt h Distance from reference point 2-6 1 28 dBu 108 km. (67 mi.) 2-6 2 and 3 28 dBu 128 km. (80 mi.) 7-13 1 36 dBu 101 km. (63 mi.) 7-13 2 and 3 36 dBu 123 km. (77 mi.) 14-51 1, 2 and 3 41 dBu 103 km. (64 mi.) Item 3. DTS Reference Point
• http://www.fcc.gov/Forms/Form340/340.pdf
  • See 47 C.F.R. Section 73.626 of the rules. Table of Distances. The following Table of Distances describes (by channel and zone) a station's maximum service area that can be obtained in applying for a DTS authorization. See 47 C.F.R. Section 73.626(c). The distances represent circles within which DTS station coverage contours must be contained. Channel Zone (see 47 C.F.R. Section 73.609) F(50,90) field strength Distance from reference point 2-6 1 28 dBu 108 km. (67 mi.) 2-6 2 and 3 28 dBu 128 km. (80 mi.) 7-13 1 36 dBu 101 km. (63 mi.) 7-13 2 and 3 36 dBu 123 km. (77 mi.) 14-51 1, 2 and 3 41 dBu 103 km. (64 mi.) Item 3. DTS Reference Point Coordinates
• http://www.fcc.gov/mb/audio/bickel/amfmrule.html
  • 73.597 FM stereophonic sound broadcasting. [281]TEXT [282]PDF 73.599 NCE-FM engineering charts. [ [283]Section 73.599 graphs ] Subpart E -- Television Broadcast Stations [284]TEXT [285]PDF 73.601 Scope of subpart. [286]TEXT [287]PDF 73.602 Cross reference to rules in other parts. [288]TEXT [289]PDF 73.603 Numerical designation of television channels. [290]TEXT [291]PDF 73.606 Table of allotments. [292]TEXT [293]PDF 73.607 Availability of channels. [294]TEXT [295]PDF 73.609 Zones. [296]TEXT [297]PDF 73.610 Minimum distance separations between stations. [298]TEXT [299]PDF 73.611 Reference points and distance computations. [300]TEXT [301]PDF 73.612 Protection from interference. [302]TEXT [303]PDF 73.613 Protection of Class A TV stations. [304]TEXT [305]PDF 73.614 Power and antenna height requirements. [306]TEXT [307]PDF 73.615 Administrative changes in authorizations. [308]TEXT [309]PDF 73.616 Post-transition DTV station interference protection. [310]TEXT [311]PDF 73.621 Noncommercial educational
• http://www.fcc.gov/mb/audio/includes/63-amfmrule.htm
  • 73.597 FM stereophonic sound broadcasting. [234]TEXT [235]PDF 73.599 NCE-FM engineering charts. [ [236]Section 73.599 graphs ] Subpart E -- Television Broadcast Stations [237]TEXT [238]PDF 73.601 Scope of subpart. [239]TEXT [240]PDF 73.602 Cross reference to rules in other parts. [241]TEXT [242]PDF 73.603 Numerical designation of television channels. [243]TEXT [244]PDF 73.606 Table of allotments. [245]TEXT [246]PDF 73.607 Availability of channels. [247]TEXT [248]PDF 73.609 Zones. [249]TEXT [250]PDF 73.610 Minimum distance separations between stations. [251]TEXT [252]PDF 73.611 Reference points and distance computations. [253]TEXT [254]PDF 73.612 Protection from interference. [255]TEXT [256]PDF 73.613 Protection of Class A TV stations. [257]TEXT [258]PDF 73.614 Power and antenna height requirements. [259]TEXT [260]PDF 73.615 Administrative changes in authorizations. [261]TEXT [262]PDF 73.616 Post-transition DTV station interference protection. [263]TEXT [264]PDF 73.621 Noncommercial educational