Sec.  90.619   Operations within the U.S./Mexico and U.S./Canada border areas.

   (a)  Use  of  Frequencies in 800 MHz Band in Mexico Border Region. All
   operations in the 806–824/851–869 MHz band within 110 km (68.4 miles) of the
   U.S./Mexico border (“Mexico border region”) shall be in accordance with
   international agreements between the U.S. and Mexico. Channels 231–710 are
   offset 12.5 kHz lower in frequency than those specified in the table in
    Sec. 90.613. Stations located on Mt. Lemmon, serving the Tucson, AZ area, will
   only be authorized offset frequencies.

   (b)  Use  of  Frequencies in 900 MHz Band in Mexico Border Region. All
   operations in the 896–901/935–940 MHz band within the Mexico border region
   shall be in accordance with international agreements between the U.S. and
   Mexico.

   (1)  The  channels listed in Table 1 below are available to applicants
   eligible in the Industrial/Business Pool of subpart C of this part but
   exclude Special Mobilized Radio Systems as defined in  Sec. 90.603(c). These
   frequencies are available within the Mexico border region. Specialized
   Mobile Radio (SMR) systems will not be authorized on these frequencies.

   For  multi-channel  systems,  channels  may  be  grouped vertically or
   horizontally as they appear in the following table. Channels numbered above
   200 may be used only subject to the power flux density limits stated in
   paragraph (a)(2) of this section:

   Table  1—United  States/Mexico  Border  Area, Business/Industrial/Land
   Transportation Pool 896–901/935–940 MHz Band

   [199 Channels]
                Channel Nos.
   11–12–13–14–15      131–132–133–134–135
   16–17–18–19–20      136–137–138–139–140
   31–32–33–34–35      231–232–233–234–235
   36–37–38–39–40      236–237–238–239–240
   51–52–53–54–55      171–172–173–174–175
   56–57–58–59–60      176–177–178–179–180
   71–72–74–75         271–272–273–274–275
   76–77–78–79–80      276–277–278–279–280
   91–92–93–94–95      211–212–213–214–215
   96–97–98–99–100     216–217–218–219–220
   111–112–113–114–115 311–312–313–314–315
   116–117–118–119–120 316–317–318–319–320
   151–152–153–154–155 351–352–353–354–355
   156–157–158–159–160 356–357–358–359–360
   191–192–193–194–195 391–392–393–394–395
   196–197–198–199–200 396–397–398–399
   251–252–253–254–255 331–332–333–334–335
   256–257–258–259–260 336–337–338–339–340
   291–292–293–294–295 371–372–373–374–375
   296–297–298–299–300 376–377–378–379–380

   (2)  The  channels listed in Table 2 of this section are available for
   operations  only  to  eligibles  in the SMR category—which consists of
   Specialized  Mobile Radio (SMR) stations and eligible end users. These
   frequencies are available in the Mexico border region. The spectrum blocks
   listed in the table below are available for EA-based services according to
    Sec. 90.681.

   Table 2—United States-Mexico Border Area, SMR Category 896–901/935–940 MHz
   Band

   [200 Channels]
   Block              Channel Nos.
   A     1–2–3–4–5–6–7–8–9–10
   B     21–22–23–24–25–26–27–28–29–30
   C     41–42–43–44–45–46–47–48–49–50
   D     61–62–63–64–65–66–67–68–69–70
   E     81–82–83–84–85–86–87–88–89–90
   F     101–102–103–104–105–106–107–108–109–110
   G     121–122–123–124–125–126–127–128–129–130
   H     141–142–143–144–145–146–147–148–149–150
   I     161–162–163–164–165–166–167–168–169–170
   J     181–182–183–184–185–186–187–188–189–190
   K     201–202–203–204–205–206–207–208–209–210
   L     221–222–223–224–225–226–227–228–229–230
   M     241–242–243–244–245–246–247–248–249–250
   N     261–262–263–264–265–266–267–268–269–270
   O     281–282–283–284–285–286–287–288–289–290
   P     301–302–303–304–305–306–307–308–309–310
   Q     321–322–323–324–325–326–327–328–329–330
   R     341–342–343–344–345–346–347–348–349–350
   S     361–362–363–364–365–366–367–368–369–370
   T     381–382–383–384–385–386–387–388–389–390

   Channels numbered above 200 may only be used subject to the power flux
   density limits at or beyond the Mexico border as stated in paragraph (4) of
   this section.

   (3) The specific channels that are available for licensing in the band
   896–901/935–940 MHz within the Mexico border region are subject to Effective
   Radiated Power (ERP) and Antenna Height limitations as indicated in Table 3
   below.

   Table 3—Limits of Effective Radiated Power (ERP) Corresponding to Antenna
   Heights  of  Base Stations in the 896–901/935–940 MHz Bands Within 110
   Kilometers (68.4 Miles) of the Mexican Border
   Antenna height above mean sea level ERP in watts
   (maximum)
   Meters Feet
   0–503 0–1650 500
   504–609 1651–2000 350
   610–762 2001–2500 200
   764–914 2501–3000 140
   915–1066 3001–3500 100
   1067–1219 3501–4000 75
   1220–1371 4000–4500 70
   1372–1523 4501–5000 65
   Above 1523 Above 5000 5

   (4)  All  channels  in  the 896–901/935–940 MHz band are available for
   assignment to U.S. stations within the Mexico border region if the maximum
   power flux density (pfd) of the station's transmitted signal at any point at
   or beyond the border does not exceed −107 dB (W/m^2 ). The spreading loss
   must be calculated using the free space formula taking into account any
   antenna discrimination in the direction of the border. Authorizations for
   stations  using channels allotted to Mexico on a primary basis will be
   secondary to Mexican operations and conditioned to require that licensees
   take immediate action to eliminate any harmful interference resulting from
   the station's transmitted signal exceeding −107 dB (W/m^2 ).

   (c) Use of 800 MHz Band in Canada Border Region. All operations in the
   806–824/851–869 MHz band within 140 km (87 miles) of the U.S./Canada border
   (“U.S./Canada  border area”) shall be in accordance with international
   agreements between the U.S. and Canada.

   (1) The U.S./Canada border area is divided into the following geographical
   regions (“Canada Border Regions”). U.S. primary channels are shown in the
   table by region. The remaining channels are primary to Canada (“Canada
   Primary channels”).

   Table C1—Geographical Regions
   Region Location (longitude) U.S. primary channels
   1 66 ° W–71 ° W (0–100 km from border) 1–260, 561–710, 772–790 and 792–830.
   2 71 ° W–80 °30' W (0–100 km from border) 1–170, 621–710 and 795–830.
   3 80 °30' W–85 ° W (0–100 km from border) 1–320, 501–710, 729–730, 732–750,
   752–770, 772–790 and 792–830.
   4  85 °  W–121 °30' W (0–100 km from border) 1–260, 561–710, 772–790 and
   792–830.
   5  121 °30' W–127 ° W (0–140 km from border) 1–260, 561–710, 772–790 and
   792–830.
   6 127 ° W–143 ° W (0–100 km from border) 1–260, 561–710, 772–790 and 792–830.
   7A 66 ° W–71 ° W (100–140 km from border) 1–830.
   7A 80 °30' W–121 °30' W (100–140 km from border) 1–830.
   7B 71 ° W–80 °30' W (100–140 km from border) 1–830.
   8 127 ° W–143 ° W (100–140 km from border) 1–830.

   (2)  Stations authorized on U.S. primary channels in all Canada Border
   Regions, except Region 5, will be subject to the Effective Radiated Power
   (ERP) and Effective Antenna Height (EAH) limitations listed in Table C2. The
   Effective Antenna Height is calculated by subtracting the Assumed Average
   Terrain Elevation (AATE) listed in Table C3 from the antenna height above
   mean sea level.

   Table C2—Limits of Effective Radiated Power (ERP) Corresponding to Effective
   Antenna Heights (EAH) for Regions 1, 2, 3, 4, 6, 7 and 8
   Effective Antenna Height (EAH) ERP watts
   (maximum)
   Metres Feet
   0–152 0–500 500
   153–305 501–1000 125
   306–457 1001–1500 40
   458–609 1501–2000 20
   610–914 2001–3000 10
   915–1066 3001–3500 6
   Above 1967 Above 3501 5

   Table C3—Assumed Average Terrain Elevation (AATE) Along the U.S.-Canada
   Border
   Longitude (Φ)
   ( °West) Latitude (Ω)
   ( °North)                      Assumed Average Terrain Elevation
           United States           Canada
        Feet          Metres     Feet Metres
   65 ≤ Φ < 69     Ω ≤ 45           0      0   0    0
   "               45 ≤ Ω < 46    300     91 300   91
   "               Ω ≤ 46        1000    305 1000  305
   69 ≤ Φ < 73     All           2000    609 1000  305
   73 ≤ Φ < 74     "              500    152 500  152
   74 ≤ Φ < 78     "              250     76 250   76
   78 ≤ Φ < 80     Ω ≤ 43         250     76 250   76
   "               Ω ≤ 43         500    152 500  152
   80 ≤ Φ < 90     All            600    183 600  183
   90 ≤ Φ < 98     "             1000    305 1000  305
   98 ≤ Φ < 102    "             1500    457 1500  457
   102 ≤ Φ < 108   "             2500    762 2500  762
   108 ≤ Φ < 111   "             3500   1066 3500 1066
   111 ≤ Φ < 113   "             4000   1219 3500 1066
   113 ≤ Φ < 114   "             5000   1524 4000 1219
   114 ≤ Φ < 121.5 "             3000    914 3000  914
   121.5 ≤ Φ 127   "                0      0   0    0
   Φ ≥ 127         54 ≤ Ω < 56      0      0   0    0
   "               56 ≤ Ω < 58    500    152 1500  457
   "               58 ≤ Ω < 60      0      0 2000  609
   "               60 ≤ Ω < 62   4000   1219 2500  762
   "               62 ≤ Ω < 64   1600    488 1600  488
   "               64 ≤ Ω < 66   1000    305 2000  609
   "               66 ≤ Ω < 68    750    228 750  228
   "               68 ≤ Ω < 69.5 1500    457 500  152
   "               Ω ≥ 69.5         0      0   0    0

   (3) Stations authorized on U.S. primary channels in Canada Border Region 5
   will be subject to the Effective Radiated Power (ERP) and Antenna Height
   Above Mean Sea Level limitations listed in Table C4.

   Table C4—Limits of Effective Radiated Power (ERP) Corresponding to Antenna
   Height Above Mean Sea Level for Region 5
   Antenna Height Above Mean Sea Level ERP Watts
   (maximum)
   Metres Feet
   0–503 0–1650 500
   504–609 1651–2000 350
   610–762 2001–2500 200
   763–914 2501–3000 140
   915–1066 3001–3500 100
   1067–1219 3501–4000 75
   1220–1371 4001–4500 70
   1372–1523 4501–5000 65
   Above 1523 Above 5000 5

   (4) Stations may be authorized on Canada Primary channels in the Canada
   Border Regions provided the maximum power flux density (PFD) per 25 kHz at
   or beyond the border does not exceed −107 dB(W/m2). Stations authorized on
   Canada Primary channels will be secondary to stations in Canada unless
   otherwise specified in an international agreement between the U.S. and
   Canada.

   (5) Stations authorized to operate within 30 kilometers of the center city
   coordinates  listed  in Table C5 are considered to fall outside of the
   U.S./Canada border area and may operate according to the non-border band
   plan listed in  Sec. 90.617.

   Table C5—Cities That Are Considered To Fall Outside the Canada Border Region
        Location              Coordinates
                         Latitude      Longitude
   Akron, Ohio        41 °05'00.2" N. 81 °30'39.4" W.
   Youngstown, Ohio   41 °05'57.2" N. 80 °39'01.3" W.
   Syracuse, New York 43 °03'04.2" N. 76 °09'12.7" W.

   (6) The channels listed in Table C6 and paragraph (c)(6)(i) of this section
   are available in the Canada Border Regions for non-cellular operations to
   eligible  applicants  in  the Public Safety Category which consists of
   licensees eligible in the Public Safety Pool of subpart B of this part. 800
   MHz high density cellular systems as defined in  Sec. 90.7 are prohibited on
   these channels.

   Table C6—Public Safety Pool 806–816/851–861 MHz Band Channels in the Canada
   Border Regions
   Canada Border Region Channel Nos. Total
   Regions 1, 4, 5 and 6 231–260 30 Channels.
   Region 2 See paragraph (c)(6)(i) of this section
   Region 3 231–320, 501–508 90 Channels.
   Regions 7A and 8 269, 289, 311, 399, 439, 270, 290, 312, 400, 440, 279, 299,
   319, 339, 359, 280, 300, 320, 340, 360, 309, 329, 349, 369, 389, 310, 330,
   350, 370, 390, 313, 353, 393, 441, 461, 314, 354, 394, 448, 468, 321, 341,
   361, 381, 419, 328, 348, 368, 388, 420, 351, 379, 409, 429, 449, 352, 380,
   410, 430, 450, 391, 392, 401, 408, 421, 428, 459, 460, 469, 470 70 Channels.
   Region 7B 231–260, 269, 289, 311, 399, 439, 270, 290, 312, 400, 440, 279,
   299, 319, 339, 359, 280, 300, 320, 340, 360, 309, 329, 349, 369, 389, 310,
   330, 350, 370, 390, 313, 353, 393, 441, 461, 314, 354, 394, 448, 468, 315,
   355, 395, 435, 475, 316, 356, 396, 436, 476, 317, 357, 397, 437, 477, 318,
   358, 398, 438, 478, 321, 341, 361, 381, 419, 328, 348, 368, 388, 420, 331,
   371, 411, 451, 491, 332, 372, 412, 452, 492, 333, 373, 413, 453, 493, 334,
   374, 414, 454, 494, 335, 375, 415, 455, 495, 336, 376, 416, 456, 496, 337,
   377, 417, 457, 497, 338, 378, 418, 458, 498, 351, 379, 409, 429, 449, 352,
   380, 410, 430, 450, 391, 392, 401, 408, 421, 428, 459, 460, 469, 470, 431,
   432, 433, 434, 471, 472, 473, 474, 479, 480 170 Channels.

   (i) Channel numbers 1–230 are also available to eligible applicants in the
   Public Safety Category in the Canada Border Regions. The assignment of these
   channels will be done in accordance with the policies defined in the Report
   and Order of Gen. Docket No. 87–112 (See  Sec. 90.16). The following channels are
   available only for mutual aid purposes as defined in Gen. Docket No. 87–112:
   Channels 1, 39, 77, 115, 153.

   (ii) [Reserved]

   (7) The channels listed in Table C7 are available in the Canada Border
   Regions  for  the  General Category. All entities will be eligible for
   licensing  on these channels. 800 MHz high density cellular systems as
   defined in  Sec. 90.7 are permitted on these channels only as indicated in Table
   C7. The channels noted for Regions 1, 2, 3, 4, 5 and 6 where high density
   cellular systems are prohibited are all frequencies that are primary to
   Canada. Stations may be licensed on these Canada Primary channels according
   to paragraph (c)(4) of this section.

   Table C7—General Category 806–821/851–866 MHz Band Channels in the Canada
   Border Regions
   Canada Border Region General Category channels where 800 MHz high density
   cellular systems are prohibited General Category channels where 800 MHz high
   density cellular systems are permitted
   Regions 1, 4, 5 and 6 261–560 561–710.
   Region 2 172–620 621–710.
   Region 3 321–500 509–710.
   Regions 7A and 8 231–260, 511–550 None.
   Region 7B 511–550 None.

   (8) The channels listed in Table C8 are available in the Canada Border
   Regions to applicants eligible in the Industrial/Business Pool of subpart C
   of this part but exclude Special Mobilized Radio Systems as defined in
    Sec. 90.603(c). 800 MHz cellular high density systems as defined in  Sec. 90.7 are
   prohibited on these channels.

   Table C8—Business/Industrial/Land Transportation Pool 806–816/851–861 MHz
   Band Channels in the Canada Border Regions
   Canada Border Region Channel Nos. Total
   Regions 1, 2, 3, 4, 5 and 6 None 0 Channels.
   Regions 7A, 7B and 8 261, 271, 281, 291, 301, 262, 272, 282, 292, 302, 263,
   273, 283, 293, 303, 264, 274, 284, 294, 304, 265, 275, 285, 295, 305, 266,
   276, 286, 296, 306, 267, 277, 287, 297, 307, 268, 278, 288, 298, 308, 322,
   362, 402, 442, 482, 323, 363, 403, 443, 483, 324, 364, 404, 444, 484, 325,
   365, 405, 445, 485, 326, 366, 406, 446, 486, 327, 367, 407, 447, 487, 342,
   382, 422, 462, 502, 343, 383, 423, 463, 503, 344, 384, 424, 464, 504, 345,
   385, 425, 465, 505, 346, 386, 426, 466, 506, 347, 387, 427, 467, 507 100
   Channels.

   (9) The channels listed in Table C9 are available in the Canada Border
   Regions  to  applicants eligible in the SMR category—which consists of
   Specialized Mobile Radio (SMR) stations and eligible end users. 800 MHz high
   density cellular systems, as defined in  Sec. 90.7, are prohibited on these
   channels.

   Table C9—SMR Category 806–816/851–861 MHz Channels Available for Site-Based
   Licensing in the Canada Border Regions
   Canada Border Region Channel Nos. Total
   Regions 1, 2, 3, 4, 5 and 6 None 0 Channels.
   Regions 7A and 8 315, 355, 395, 435, 475, 316, 356, 396, 436, 476, 317, 357,
   397, 437, 477, 318, 358, 398, 438, 478, 331, 371, 411, 451, 491, 332, 372,
   412, 452, 492, 333, 373, 413, 453, 493, 334, 374, 414, 454, 494, 335, 375,
   415, 455, 495, 336, 376, 416, 456, 496, 337, 377, 417, 457, 497, 338, 378,
   418, 458, 498, 431, 432, 433, 434, 471, 472, 473, 474, 479, 480, 481, 488,
   489, 490, 499, 500, 501, 508, 509, 510 80 Channels.
   Region 7B 481, 488, 489, 490, 499, 500, 501, 508, 509, 510 10 Channels.

   (10) The channels listed in Table C10 are available in the Canada Border
   Regions  to  applicants eligible in the SMR category—which consists of
   Specialized  Mobile  Radio (SMR) stations and eligible end users. ESMR
   licensees who employ 800 MHz high density cellular systems, as defined in
    Sec. 90.7, are permitted to operate on these channels. Some of the channels
   listed in Table C10 are primary to Canada as indicated in paragraph (c)(1)
   of this section. ESMR systems may be authorized on these Canada Primary
   channels according to paragraph (c)(4) of this section.

   Table C10—ESMR Category 817–824/862–869 MHz Channels Available for 800 MHz
   High Density Systems
      Canada Border Region     Channel Nos.     Total
   Regions 1, 2, 3, 4, 5 and 6 711–830      120 Channels.
   Regions 7A, 7B and 8        551–830      280 Channels.

   (11) In Canada Border Regions 1, 2, 3, 4, 5 and 6, the following General
   Category channels are available for licensing to all entities except as
   described in paragraphs (c)(11)(i) and (c)(11)(ii) of this section: In
   Regions 1, 4, 5 and 6, channels 261–560; in Region 2, channels 172–620 and
   in Region 3, channels 321–500.

   (i) In a given 800 MHz NPSPAC region, the General Category channels listed
   paragraph (c)(11) of this section which are vacated by licensees relocating
   to channels 711–830 and which remain vacant after band reconfiguration will
   be available for licensing as follows:

   (A) Only to eligible applicants in the Public Safety Category until three
   years after the release of a public notice announcing the completion of band
   reconfiguration in that region;

   (B)  Only  to  eligible  applicants  in  the Public Safety or Critical
   Infrastructure  Industry Categories from three to five years after the
   release of a public notice announcing the completion of band reconfiguration
   in that region; and

   (C) To all entities five years after release of a public notice announcing
   the completion of band reconfiguration in that region.

   (ii) The General Category channels listed in paragraph (c)(11) of this
   section are primary to Canada. Stations may be authorized on these Canada
   Primary channels according to paragraph (c)(4).

   (12) In Canada Border Regions 7A, 7B and 8, the following channels will be
   available as described in paragraphs (c)(12)(i) and (c)(12)(ii) of this
   section: for Canada Border Regions 7A and 8, channels 231–260 and channels
   below 471 in Tables C8 and C9; for Canada Border Region 7B all channels in
   Tables C8 and C9.

   (i) In a given 800 MHz NPSPAC region, the channels listed paragraph (c)(12)
   of  this section which are vacated by licensees relocating to channels
   511–830 and which remain vacant after band reconfiguration will be available
   as follows:

   (A) Only to eligible applicants in the Public Safety Category until three
   years after the release of a public notice announcing the completion of band
   reconfiguration in that region; and

   (B)  Only  to  eligible  applicants  in  the Public Safety or Critical
   Infrastructure  Industry Categories from three to five years after the
   release of a public notice announcing the completion of band reconfiguration
   in that region.

   (ii)  Five  years  after the release of a public notice announcing the
   completion of band reconfiguration in a given 800 MHz NPSPAC region, the
   channels listed in paragraph (c)(12) of this section will revert back to
   their original pool categories.

   (d) Use of 900 MHz Band in Canada Border Region. All operations in the
   896–901/935–940  MHz  band within the Canada border region shall be in
   accordance with international agreements between the U.S. and Canada. The
   following criteria shall govern the assignment of frequency pairs (channels)
   in the 896–901/935–940 MHz band for stations located in the U.S./Canada
   border area. They are available for assignments for conventional or trunked
   systems in accordance with applicable sections of this subpart.

   (1)  Channels 1–399, as listed in  Sec. 90.613 table of 896–901/935–940 MHz
   Channel Designations, are available to eligible applicants for use in the
   U.S./Canada border area as shown in table 27. Additionally, Channels 71, 75,
   79, 151, 155, and 159 are available in all regions only for implementation
   of an Advanced Train Control System as defined in 3 FCC Rcd 427 (1988)
   (Advanced Train Control Waiver).

   Table 27—Channels in the 896–901/935–940 MHz Frequency Bands Available in
   the U.S./Canada Border Area
   Region           Location (longitude)              Channels
   1      66 ° W–71 ° W. (0–100 km from border)      1–200, 398, 399
   2      71 ° W–80 °30' W (0–100 km from border)              1–120
   3      80 °30' W–85 ° W (0–100 km from border)              1–340
   4      85 ° W–121 °30' W (0–100 km from border)   1–200, 398, 399
   5      121 °30' W–127 ° W (0–140 km from border)  1–200, 398, 399
   6      127 ° W–143 ° W (0–100 km from border)     1–200, 398, 399
   7      66 ° W–121 °30' W (100–140 km from border)           1–399
   8      127 ° W–143 ° W (100–140 km from border)             1–399

   Note: For assignments in the 896–901/935–940 MHz bands, the cities of Akron,
   Ohio (41 °05'00" N, 81 °30'40" W) and Youngstown, Ohio (41 °05'57" N, 80 °39'02"
   W) are considered outside of Region 3, and Syracuse, New York (43 °03'04" N,
   76 °09'14" W) is considered outside of Region 2. These cities are defined as
   an area with the given center coordinates and encompassing a circle of 30 km
   radius.

   (2) All frequency assignments made pursuant to paragraph (d)(1) of this
   section shall comply with the requirements of  Sec. 90.619(b).

   (3) In Region 5, Channels 201–397 may be authorized in the United States
   under the following conditions:

   (i) An assignment may be made if the predicted power flux density (PFD) of a
   proposed station's signal does not exceed –107 dBW/m^2 at the border. The
   prediction of the PFD is calculated based upon a modified Longley-Rice
   point-to-point propagation model with time and location variabilities of 10
   percent^3 and 3-second digitized terrain date^4 .

   ^3 See note 1, paragraph (c) of this section.

   ^4 See note 2, paragraph (c) of this section.

   (ii)  Authorizations for Channels 201–397 in Region 5 are secondary to
   Canadian operations and conditioned to require that licensees take immediate
   action to eliminate any harmful interference resulting from the station's
   transmitted signal exceeding –107 dBW/m^2 at or beyond the U.S./Canada
   border.

   (4) Channel assignments for stations to be located in the geographical area
   in Region 1 enclosed by the United States-Canada border, the meridian 71 ° W
   and the line beginning at the intersection of 44 °25' N, 71 ° W, then running
   by great circle arc to the intersection of 45 ° N, 70 ° W, then North along
   meridian 70 ° W to the intersection of 45 °45' N, then running West along
   45 °45' N to the intersection of the United States-Canada border, will be
   only  for  channels 121 through 160, inclusive, and will be limited to
   assignments with 11 kHz or less necessary bandwidth. Coordination with
   Canada will be required for these channels.

   (5) Channel assignments for stations to be located in the geographical area
   in Region 3 enclosed by the meridian of 81 ° W longitude, the arc of a circle
   of 100 km radius centered at 42 °39'30" N latitude and 81 ° W longitude at the
   northern  shore  of  Lake  Erie and drawn clockwise from the southerly
   intersection with 80 °30' W longitude to intersect the United States-Canada
   border West of 81 ° W, and the United States-Canada border, will be only for
   channels 121 through 230, inclusive, and will be limited to assignments with
   11  kHz  or less necessary bandwidth. Coordination with Canada will be
   required for these channels. U.S. stations must protect Canadian stations
   operating on channels 121 through 230 within an area of 30 km radius from
   the  center  city coordinates (referenced to North American Datum 1983
   (NAD83)) of London, Ontario (42 °59'00.1" N, 81 °13'59.5" W).

   (6) Additional channels available —The channels listed in table 28 are
   available for assignment in Regions 1–6 if the maximum power flux density
   (PFD)  of  the station's transmitted signal does not exceed the limits
   specified in tables 29 and 30. The spreading loss shall be calculated using
   the free space formula taking into account any antenna discrimination in the
   direction of the border.

   Table 28—Additional Channels Available

   [Regions 1–6]
   Region Channel No.'s Effective radiated power
   1            201–397 See Table 29
   2            121–399 See Table 29
   3            341–399 See Table 29
   4            201–397 See Table 29
   5            201–397 See Table 30
   6            201–397 See Table 29

   Authorizations  for stations using these channels will be secondary to
   Canadian operations and conditioned to require that licensees take immediate
   action to eliminate any harmful interference resulting from the station's
   transmitted signal exceeding the values specified in tables 29 or 30 at or
   beyond the U.S./Canada border.

   Table  29—Maximum  Power  Flux Density (PFD) at the U.S./Canada Border
   Corresponding to Effective Antenna Height

   [Regions 1, 2, 3, 4, and 6]
     Effective antenna height (EAH)    PFD (dBW/m^2)
      Feet             Meters
   0–500      0–152                              −84
   501–1000   153–305                            −90
   1001–1500  306–457                            −95
   1501–2000  458–609                            −98
   2001–2500  610–762                           −101
   2501–3000  763–914                           −101
   3001–3500  915–1066                          −103
   3501–4000  1067–1219                         −104
   Above 4000 Above 1219                        −104

   Table  30—Maximum  Power  Flux Density (PFD) at the U.S./Canada Border
   Corresponding to Antenna Height Above Mean Sea Level

   [Region 5]
     Antenna height above mean sea level   PFD (dBW/m^2)
      Feet               Meters
   0–1650     0–503                                −87.0
   1651–2000  504–609                              −88.5
   2001–2500  610–762                              −91.0
   2501–3000  763–914                              −92.5
   3001–3500  915–1066                             −94.0
   3501–4000  1067–1219                            −95.0
   4001–4500  1220–1371                            −95.5
   4501–5000  1372–1523                            −96.0
   Above 5000 Above 1523                          −107.0

   (Secs.  4(i) and 303, Communications Act, as amended, and 5 U.S.C. 553
   (b)(3)(B) and (d)(1))

   [ 47 FR 41032 , Sept. 16, 1982;  47 FR 41045 , Sept. 16, 1982;  47 FR 51883 , Nov.
   18, 1982, as amended at  48 FR 51928 , Nov. 15, 1983;  49 FR 22094 , May 25,
   1984;  50 FR 12261 , Mar. 28, 1985;  52 FR 3662 , Feb. 5, 1987;  55 FR 42571 ,
   Oct. 22, 1990;  56 FR 41469 , Aug. 21, 1991;  57 FR 55146 , Nov. 24, 1992;  58 FR 31476 , June 3, 1993;  58 FR 44963 , Aug. 25, 1993;  59 FR 31558 , June 20, 1994;
    60 FR 48918 , Sept. 21, 1995;  61 FR 6156 , Feb. 16, 1996;  61 FR 6577 , Feb. 21,
   1996;  62 FR 18935 , Apr. 17, 1997;  62 FR 41214 , July 31, 1997;  63 FR 68968 ,
   Dec. 14, 1998;  64 FR 71054 , Dec. 20, 1999;  69 FR 67846 , Nov. 22, 2004;  70 FR 76711 , Dec. 28, 2005;  73 FR 33731 , June 13, 2008]