Sec.  73.807   Minimum distance separation between stations.

   Minimum separation requirements for LP100 and LP10 stations, as defined in
    Sec.  Sec. 73.811 and 73.853, are listed in the following paragraphs. An LPFM station
   will not be authorized unless these separations are met. Minimum distances
   for co-channel and first-adjacent channel are separated into two columns.
   The left-hand column lists the required minimum separation to protect other
   stations and the right-hand column lists (for informational purposes only)
   the  minimum  distance  necessary  for  the LPFM station to receive no
   interference  from  other stations assumed to operating at the maximum
   permitted facilities for the station class. For second- and third-adjacent
   channels  and IF channels, the required minimum distance separation is
   sufficient to avoid interference received from other stations.

   (a)(1) An LP100 station will not be authorized initially unless the minimum
   distance  separations  in  the following table are met with respect to
   authorized FM stations, applications for new and existing FM stations filed
   prior to the release of the public notice announcing an LPFM window period
   for LP100 stations, authorized LP100 stations, LP100 station applications
   that were timely-filed within a previous window, and vacant FM allotments.
   LP100 stations are not required to protect LP10 stations. LPFM modification
   applications must either meet the distance separations in the following
   table or, if short-spaced, not lessen the spacing to subsequently authorized
   stations.
   Station class protected by LP100 Co-channel minimum
   separation (km) First-adjacent channel
   minimum  separation  (km)  Second-  and third-adjacent channel minimum
   separation (km) I.F. channel minimum separations
   Required For no interference received from max. class facility Required For
   no interference received from max. class facility Required 10.6 or 10.8 MHz
   LP100 24 24 14 14 None None
   D 24 24 13 13 6 3
   A 67 92 56 56 29 6
   B1 87 119 74 74 46 9
   B 112 143 97 97 67 12
   C3 78 119 67 67 40 9
   C2 91 143 80 84 53 12
   C1 111 178 100 111 73 20
   C0 122 193 111 130 84 22
   C 130 203 120 142 93 28

   (2) LP100 stations must satisfy the second-adjacent channel minimum distance
   separation requirements of paragraph (a)(1) of this section with respect to
   any third-adjacent channel FM station that, as of September 20, 2000 (the
   adoption  date of this MO&O ) broadcasts a radio reading service via a
   subcarrier frequency.

   (b)(1) An LP10 station will not be authorized unless the minimum distance
   separations in the following table are met with respect to authorized FM
   stations, applications for new and existing FM stations filed prior to the
   release of the public notice announcing an LPFM window period for LP10
   stations, vacant FM allotments, or LPFM stations.
   Station class protected by LP10 Co-channel minimum
   separation (km) First-adjacent channel
   minimum separation
   (km) Second- and third-adjacent channel minimum separation (km) I.F. Channel
   minimum separations
   Required For no interference received from max. class facility Required For
   no interference received from max. class facility Required 10.6 or 10.8 MHz
   LP100 16 22 10 11 None None
   LP10 13 13 8 8 None None
   D 16 21 10 11 6 2
   A 59 90 53 53 29 5
   B1 77 117 70 70 45 8
   B 99 141 91 91 66 11
   C3 69 117 64 64 39 8
   C2 82 141 77 81 52 11
   C1 103 175 97 108 73 18
   C0 114 190 99 127 84 21
   C 122 201 116 140 92 26

   (2) LP10 stations must satisfy the second-adjacent channel minimum distance
   separation requirements of paragraph (b)(1) of this section with respect to
   any third-adjacent channel FM station that, as of September 20, 2000 (the
   adoption  date of this MO&O ) broadcasts a radio reading service via a
   subcarrier frequency.

   (c) In addition to meeting or exceeding the minimum separations for Class
   LP100 and Class LP10 stations in paragraphs (a) and (b) of this section, new
   LP100 and LP10 stations will not be authorized in Puerto Rico or the Virgin
   Islands unless the minimum distance separations in the following tables are
   met with respect to authorized or proposed FM stations:

   (1) LP100 stations in Puerto Rico and the Virgin Islands:
   Station class protected by LP100 Co-channel minimum
   separation (km) First-adjacent channel
   minimum  separation  (km)  Second-  and third-adjacent channel minimum
   separation (km)—required I.F. channel minimum separations—10.6 or 10.8 MHz
   Required For no interference received from max. class facility Required For
   no interference received from max. class facility
   A 80 111 70 70 42 9
   B1 95 128 82 82 53 11
   B 138 179 123 123 92 19

   (2) LP10 stations in Puerto Rico and the Virgin Islands:
   Station class protected by LP100 Co-channel minimum
   separation (km) First-adjacent channel
   minimum  separation  (km)  Second-  and third-adjacent channel minimum
   separation (km)—required I.F. channel minimum separations—10.6 or 10.8 MHz
   Required For no interference received from max. class facility Required For
   no interference received from max. class facility
   A 72 108 66 66 42 8
   B1 84 125 78 78 53 9
   B 126 177 118 118 92 18

   Note to paragraphs(a), (b),and(c): Minimum distance separations towards
   “grandfathered” superpowered Reserved Band stations are as specified.

   Full  service FM stations operating within the reserved band (Channels
   201–220) with facilities in excess of those permitted in  Sec. 73.211(b)(1) or
    Sec. 73.211(b)(3) shall be protected by LPFM stations in accordance with the
   minimum distance separations for the nearest class as determined under
    Sec. 73.211. For example, a Class B1 station operating with facilities that
   result in a 60 dBu contour that exceeds 39 kilometers but is less than 52
   kilometers would be protected by the Class B minimum distance separations.
   Class D stations with 60 dBu contours that exceed 5 kilometers will be
   protected by the Class A minimum distance separations. Class B stations with
   60 dBu contours that exceed 52 kilometers will be protected as Class C1 or
   Class C stations depending upon the distance to the 60 dBu contour. No
   stations will be protected beyond Class C separations.

   (d)  In  addition  to  meeting  the  separations (a) through (c), LPFM
   applications must meet the minimum separation requirements with respect to
   authorized FM translator stations, cutoff FM translator applications, and FM
   translator applications filed prior to the release of the Public Notice
   announcing the LPFM window period:

   (1) LP100 stations:
   Distance to FM translator 60 dBu contour Co-channel minimum separation (km)
   First-adjacent channel minimum
   separation (km) Second- and third-adjacent channel minimum
   separation (km)
   required I.F . Channel minimum
   separation (km)
   10.6 or 10.8 MHz
   Required For no
   interference
   received Required For no
   interference
   received
   13.3 km or greater 39 67 28 35 21 5
   Greater than 7.3 km, but less than 13.3 km 32 51 21 26 14 5
   7.3 km or less 26 30 15 16 8 5

   (2) LP10 Stations:
   Distance to FM translator 60 dBu contour Co-channel minimum separation (km)
   First-adjacent channel minimum
   separation (km) Second- and third-adjacent channel minimum
   separation (km)
   required I.F . Channel minimum
   separation (km)
   10.6 or 10.8 MHz
   Required For no
   interference
   received Required For no
   interference
   received
   13.3 km or greater 30 65 25 33 20 3
   Greater than 7.3 km, but less than 13.3 km 24 49 18 23 14 3
   7.3 km or less 18 28 12 14 8 3

   (e) Existing Class LP100 and LP10 stations which do not meet the separations
   in paragraphs (a) through (e) of this section may be relocated provided that
   the separation to any short-spaced station is not reduced.

   (f) Commercial and noncommercial educational stations authorized under
   subparts B and C of this part, as well as new or modified commercial FM
   allotments, are not required to adhere to the separations specified in this
   rule section, even where new or increased interference would be created.

   (g) International considerations within the border zones. (1) Within 320 km
   of the Canadian border, LP100 stations must meet the following minimum
   separations with respect to any Canadian stations:
   Canadian station class Co-channel (km) First-adjacent channel (km)
   Second-adjacent  channel (km) Third-adjacent channel (km) Intermediate
   frequency (IF) channel (km)
   A1 & Low Power 45 30 21 20 4
   A 66 50 41 40 7
   B1 78 62 53 52 9
   B 92 76 68 66 12
   C1 113 98 89 88 19
   C 124 108 99 98 28

   (2)  Within 320 km of the Mexican border, LP100 stations must meet the
   following separations with respect to any Mexican stations:
   Mexican station class Co-channel (km) First-adjacent channel (km)
   Second-third adjacent channel (km) Intermediate frequency (IF) channel (km)
   Low Power 27 17 9 3
   A 43 32 25 5
   AA 47 36 29 6
   B1 67 54 45 8
   B 91 76 66 11
   C1 91 80 73 19
   C 110 100 92 27

   (3)  Within 320 km of the Canadian border, LP10 stations must meet the
   following minimum separations with respect to any Canadian stations:
   Canadian station class Co-channel (km) First-adjacent channel (km)
   Second-adjacent  channel (km) Third-adjacent channel (km) Intermediate
   frequency (IF) channel (km)
   A1 & Low Power 33 25 20 19 3
   A 53 45 40 39 5
   B1 65 57 52 51 8
   B 79 71 67 66 11
   C1 101 93 88 87 18
   C 111 103 98 97 26

   (4)  Within  320 km of the Mexican border, LP10 stations must meet the
   following separations with respect to any Mexican stations:
   Mexican station class Co-channel (km) First-adjacent channel (km)
   Second-third adjacent channel (km) Intermediate frequency (IF) channel (km)
   Low Power 19 13 9 2
   A 34 29 24 5
   AA 39 33 29 5
   B1 57 50 45 8
   B 79 71 66 11
   C1 83 77 73 18
   C 102 96 92 26

   (5) The Commission will notify the International Telecommunications Union
   (ITU) of any LPFM authorizations in the US Virgin Islands. Any authorization
   issued for a US Virgin Islands LPFM station will include a condition that
   permits the Commission to modify, suspend or terminate without right to a
   hearing  if  found by the Commission to be necessary to conform to any
   international regulations or agreements.

   (6)  The Commission will initiate international coordination of a LPFM
   proposal even where the above Canadian and Mexican spacing tables are met,
   if it appears that such coordination is necessary to maintain compliance
   with international agreements.

   [ 65 FR 7640 , Feb. 15, 2000, as amended at  65 FR 67299 , Nov. 9, 2000;  65 FR 79779 , Dec. 20, 2000;  66 FR 23863 , May 10, 2001]