Title 47: Telecommunication
PART 22—PUBLIC MOBILE SERVICES
Subpart I—Offshore Radiotelephone Service
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§ 22.1007 Channels for offshore radiotelephone systems.
The channels listed in this section are allocated for paired assignment to transmitters located in the specified geographical zones that provide offshore radiotelephone service. All channels have a bandwidth of 20 kHz and are designated by their center frequencies in MegaHertz.
(a) Zone A—Southern Louisiana. The geographical area in Zone A is bounded as follows:
From longitude W.87°45' on the East to longitude W.94°00' on the West and from the 4.8 kilometer (3 mile) limit along the Gulf of Mexico shoreline on the North to the limit of the Outer Continental Shelf on the South.
(1) These channels may be assigned for use by offshore central (base/fixed) or subscriber stations (fixed, temporary fixed, surface and/or airborne mobile) as indicated, for voice-grade general communications:
------------------------------------------------------------------------ Central Subscriber Central Subscriber------------------------------------------------------------------------488.025...................... 491.025 488.225......... 491.225488.050...................... 491.050 488.250......... 491.250488.075...................... 491.075 488.275......... 491.275488.100...................... 491.100 488.300......... 491.300488.125...................... 491.125 488.325......... 491.325488.150...................... 491.150 488.350......... 491.350488.175...................... 491.175 488.375......... 491.375488.200...................... 491.200 488.400......... 491.400------------------------------------------------------------------------
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(2) These channels may be assigned for use by offshore central (base/fixed) or subscriber stations (fixed, temporary fixed, surface and/or airborne mobile) as indicated, for voice-grade general communications and private line service:
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------------------------------------------------------------------------ Central Subscriber Central Subscriber------------------------------------------------------------------------488.425...................... 491.425 488.575......... 491.575488.450...................... 491.450 488.600......... 491.600488.475...................... 491.475 488.625......... 491.625488.500...................... 491.500 488.650......... 491.650488.525...................... 491.525 488.675......... 491.675488.550...................... 491.550 488.700......... 491.700------------------------------------------------------------------------
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(3) These channels may be assigned for use by relay stations in systems where it would be impractical to provide offshore radiotelephone service without the use of relay stations.
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------------------------------------------------------------------------ Central Subscriber Central Subscriber------------------------------------------------------------------------488.725...................... 491.725 488.775......... 491.775488.750...................... 491.750 488.800......... 491.800------------------------------------------------------------------------
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(4) These channels may be assigned for use by offshore central (base/fixed) or subscriber stations (fixed, temporary fixed, surface and/or airborne mobile) as indicated, for emergency communications involving protection of life and property.
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------------------------------------------------------------------------ Central Subscriber Central Subscriber------------------------------------------------------------------------488.825...................... 491.825 488.875......... 491.875488.850...................... 491.850 488.900......... 491.900------------------------------------------------------------------------
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(5) These channels may be assigned for use by offshore central (base/fixed) or subscriber stations (fixed, temporary fixed, surface and/or airborne mobile) as indicated, for emergency auto alarm and voice transmission pertaining to emergency conditions only.
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------------------------------------------------------------------------ Central Subscriber------------------------------------------------------------------------ 488.950................ 491.950------------------------------------------------------------------------
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(6) These channels may be assigned for use by offshore central (base/fixed) or subscriber stations (fixed, temporary fixed, surface and/or airborne mobile) as indicated, for emergency shut-off remote control telemetry, environmental data acquisition and disseminations, or facsimile transmissions.
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------------------------------------------------------------------------ Central Subscriber Central Subscriber------------------------------------------------------------------------489.000...................... 492.000 489.200......... 492.200489.025...................... 492.025 489.225......... 492.225489.050...................... 492.050 489.250......... 492.250489.075...................... 492.075 489.275......... 492.275489.100...................... 492.100 489.300......... 492.300489.125...................... 492.125 489.325......... 492.325489.150...................... 492.150 489.350......... 492.350489.175...................... 492.175 489.375......... 492.375------------------------------------------------------------------------
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(7) These channels may be assigned for use by offshore central (base/fixed) or subscriber stations (fixed, temporary fixed, surface and/or airborne mobile) as indicated, for private line service:
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------------------------------------------------------------------------ Central Subscriber Central Subscriber------------------------------------------------------------------------489.400...................... 492.400 489.725......... 492.725489.425...................... 492.425 489.750......... 492.750489.450...................... 492.450 489.775......... 492.775489.475...................... 492.475 489.800......... 492.800489.500...................... 492.500 489.825......... 492.825489.525...................... 492.525 489.850......... 492.850489.550...................... 492.550 489.875......... 492.875489.575...................... 492.575 489.900......... 492.900489.600...................... 492.600 489.925......... 492.925489.625...................... 492.625 489.950......... 492.950489.650...................... 492.650 489.975......... 492.975489.675...................... 492.675 490.000......... 493.000489.700...................... 492.700------------------------------------------------------------------------
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(8) Interstitial channels. Interstitial channels are those with center frequencies offset by ±12.5 kHz from the listed center frequencies. The FCC may assign interstitial channels to offshore stations in Zone A subject to the following conditions:
(i) Offshore stations transmitting on interstitial channels must be located east of W.92° longitude.
(ii) Operations on interstitial channels are considered to be secondary to operations on channels with the listed center frequencies.
(iii) Offshore stations operating on interstitial channels must be used only for voice grade general communications or to provide for private line service.
Note to paragraph (a) of §22.1007: These channels are contained in UHF TV Channel 17.
(b) Zone B—Southern Louisiana—Texas. (1) The geographical area in Zone B is bounded as follows:
From longitude W.87°45' on the East to longitude W.95°00' on the West and from the 4.8 kilometer (3 mile) limit along the Gulf of Mexico shoreline on the North to the limit of the Outer Continental Shelf on the South.
(2) These channels may be assigned for use by offshore central (base/fixed) or subscriber stations (fixed, temporary fixed, surface and/or airborne mobile) as indicated, for voice-grade general communications and private line service:
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------------------------------------------------------------------------ Central Subscriber Central Subscriber------------------------------------------------------------------------485.025...................... 482.025 486.025......... 483.025485.050...................... 482.050 486.050......... 483.050485.075...................... 482.075 486.075......... 483.075485.100...................... 482.100 486.100......... 483.100485.125...................... 482.125 486.125......... 483.125485.150...................... 482.150 485.150......... 483.150485.175...................... 482.175 486.175......... 483.175485.200...................... 482.200 486.200......... 483.200485.225...................... 482.225 486.225......... 483.225485.250...................... 482.250 486.250......... 483.250485.275...................... 482.275 486.275......... 483.275485.300...................... 482.300 486.300......... 483.300485.325...................... 482.325 486.325......... 483.325485.350...................... 482.350 486.350......... 483.350485.375...................... 482.375 486.375......... 483.375485.400...................... 482.400 486.400......... 483.400485.425...................... 482.425 486.425......... 483.425485.450...................... 482.450 486.450......... 483.450485.475...................... 482.475 486.475......... 483.475485.500...................... 482.500 486.500......... 483.500485.525...................... 482.525 486.525......... 483.525485.550...................... 482.550 484.550......... 483.550485.575...................... 482.575 486.575......... 483.575485.600...................... 482.600 486.600......... 483.600485.625...................... 482.625 486.625......... 483.625485.650...................... 482.650 486.650......... 483.650485.675...................... 482.675 486.675......... 483.675485.700...................... 482.700 486.700......... 483.700485.725...................... 482.725 486.725......... 483.725485.750...................... 482.750 486.750......... 483.750485.775...................... 482.775 486.775......... 483.775485.800...................... 482.800 486.800......... 483.800485.825...................... 482.825 486.825......... 483.825485.850...................... 482.850 486.850......... 483.850485.875...................... 482.875 486.875......... 483.875485.900...................... 482.900 486.900......... 483.900485.925...................... 482.925 486.925......... 483.925485.950...................... 482.950 486.950......... 483.950485.975...................... 482.975 486.975......... 483.975486.000...................... 483.000 487.050......... 480.050------------------------------------------------------------------------
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Note to paragraph (b) of §22.1007: These channels are contained in UHF TV Channel 16.
(c) Zone C—Southern Texas. The geographical area in Zone C is bounded as follows:
Longitude W.94°00' on the East, the 4.8 kilometer (3 mile) limit on the North and West, a 282 kilometer (175 mile) radius from the reference point at Linares, N.L., Mexico on the Southwest, latitude N.26°00' on the South, and the limits of the outer continental shelf on the Southeast.
(1) These channels may be assigned for use by offshore central (base/fixed) or subscriber stations (fixed, temporary fixed, surface and/or airborne mobile) as indicated, for emergency auto alarm and voice transmission pertaining to emergency conditions only.
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------------------------------------------------------------------------ Central Subscriber------------------------------------------------------------------------ 476.950................ 479.950------------------------------------------------------------------------
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(2) These channels may be assigned for use by offshore central (base/fixed) or subscriber stations (fixed, temporary fixed, surface and/or airborne mobile) as indicated, for voice-grade general communications and private line service:
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476.025 479.025 476.050 479.050 476.075 479.075 476.100 479.100 476.125 479.125 476.150 479.150 476.175 479.175 476.200 479.200 476.225 479.225 476.250 479.250 476.275 479.275 476.300 479.300 476.325 479.325 476.350 479.350 476.375 479.375 476.400 479.400 476.425 479.425 476.450 479.450 476.475 479.475 476.500 479.500 476.525 479.525 476.550 479.550 476.575 479.575 476.600 479.600 476.625 479.625 476.650 479.650 476.675 479.675 476.700 479.700 476.725 479.725 476.750 479.750 476.775 479.775 476.800 479.800 476.825 479.825 476.850 479.850 476.875 479.875 476.900 479.900 477.000 480.000 477.025 480.025 477.075 480.075 477.100 480.100 477.125 480.125 477.150 480.150 477.175 480.175 477.200 480.200 477.225 480.225 477.250 480.250 477.275 480.275 477.300 480.300 477.325 480.325 477.350 480.350 477.375 480.375 477.400 480.400 477.425 480.425 477.450 480.450 477.475 480.475 477.500 480.500 477.525 480.525 477.550 480.550 477.575 480.575 477.600 480.600 477.625 480.625 477.650 480.650 477.675 480.675 477.700 480.700 477.725 480.725 477.750 480.750 477.775 480.775 477.800 480.800 477.825 480.825 477.850 480.850 477.875 480.875 477.900 480.900 477.925 480.925 477.950 480.950 477.975 480.975
