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
   (“Canada  border  region”)  shall  be in accordance with international
   agreements between the U.S. and Canada.

   (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]