Goto Section: 73.805 | 73.808 | Table of Contents

FCC 73.807
Revised as of October 1, 2005
Goto Year:2004 | 2006
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.


-------------------------------------------------------------------------------
---------------------------------
                                      Co-channel minimum       First-adjacent c
hannel   Second- and      I.F.
                                       separation (km)        minimum separatio
n (km)      third-      channel
                                 ----------------------------------------------
--------   adjacent     minimum
                                                  For no                     Fo
r no       channel    separations
Station class protected by LP100               interference               inter
ference    minimum   ------------
                                                 received                   rec
eived     separation
                                    Required     from max.     Required     fro
m max.       (km)       10.6 or
                                                   class                      c
lass    -------------   10.8 MHz
                                                 facility                   fac
ility      Required
-------------------------------------------------------------------------------
---------------------------------
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.


-------------------------------------------------------------------------------
---------------------------------
                                      Co-channel minimum       First-adjacent c
hannel   Second- and      I.F.
                                       separation (km)        minimum separatio
n  (km)     third-      Channel
                                 ----------------------------------------------
--------   adjacent     minimum
                                                  For no                     Fo
r no       channel    separations
 Station class protected by LP10               interference               inter
ference    minimum   ------------
                                                 received                   rec
eived     separation
                                    Required     from max.     Required     fro
m max.       (km)       10.6 or
                                                   class                      c
lass    -------------   10.8 MHz
                                                 facility                   fac
ility      Required
-------------------------------------------------------------------------------
---------------------------------
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:


-------------------------------------------------------------------------------
-------------------------------------------------------------------------
                                                                       Co-chann
el minimum       First-adjacent channel
                                                                        separat
ion (km)        minimum separation (km)    Second- and
                                                                  -------------
-----------------------------------------     third-

    For no                     For no        adjacent      I.F. channel
                 Station class protected by LP100
 interference               interference     channel          minimum

   received                   received       minimum     separations_10.6
                                                                     Required
   from max.     Required     from max.     separation      or 10.8 MHz

     class                      class     (km)_required

   facility                   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:


-------------------------------------------------------------------------------
-------------------------------------------------------------------------
                                                                       Co-chann
el minimum       First-adjacent channel
                                                                        separat
ion (km)        minimum separation (km)    Second- and
                                                                  -------------
-----------------------------------------     third-

    For no                     For no        adjacent      I.F. channel
                 Station class protected by LP100
 interference               interference     channel          minimum

   received                   received       minimum     separations_10.6
                                                                     Required
   from max.     Required     from max.     separation      or 10.8 MHz

     class                      class     (km)_required

   facility                   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:


-------------------------------------------------------------------------------
-------------------------------------------------------------------------
                                                                     Co-channel
 minimum         First-adjacent channel      Second- and
                                                                      separatio
n (km)          minimum  separation (km)   third-adjacent   I.F . Channel
                                                               ----------------
------------------------------------------     channel         minimum
           Distance to FM translator 60 dBu contour
  For no                       For no          minimum       separation
                                                                  Required    i
nterference     Required    interference     separation     (km)  10.6 or

 received                     received     (km)  required     10.8 MHz
-------------------------------------------------------------------------------
-------------------------------------------------------------------------
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:


-------------------------------------------------------------------------------
-------------------------------------------------------------------------
                                                                     Co-channel
 minimum         First-adjacent channel      Second- and
                                                                      separatio
n (km)          minimum  separation (km)   third-adjacent   I.F . Channel
                                                               ----------------
------------------------------------------     channel         minimum
           Distance to FM translator 60 dBu contour
  For no                       For no          minimum       separation
                                                                  Required    i
nterference     Required    interference     separation     (km)  10.6 or

 received                     received     (km)  required     10.8 MHz
-------------------------------------------------------------------------------
-------------------------------------------------------------------------
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:


-------------------------------------------------------------------------------
---------------------------------
                                                                First-      Sec
ond-       Third-    Intermediate
                                                 Co-channel    adjacent     adj
acent     adjacent     frequency
            Canadian station class                  (km)       channel      cha
nnel      channel    (IF) channel
                                                                 (km)         (
km)         (km)         (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:


-------------------------------------------------------------------------------
---------------------------------

          Second-
                                                                             Fi
rst-       third     Intermediate
                   Mexican station class                      Co-channel    adj
acent     adjacent     frequency
                                                                 (km)       cha
nnel      channel    (IF) channel
                                                                              (
km)         (km)         (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:


-------------------------------------------------------------------------------
---------------------------------
                                                                First-      Sec
ond-       Third-    Intermediate
                                                 Co-channel    adjacent     adj
acent     adjacent     frequency
            Canadian station class                  (km)       channel      cha
nnel      channel    (IF) channel
                                                                 (km)         (
km)         (km)         (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:


-------------------------------------------------------------------------------
---------------------------------

          Second-
                                                                             Fi
rst-       third     Intermediate
                   Mexican station class                      Co-channel    adj
acent     adjacent     frequency
                                                                 (km)       cha
nnel      channel    (IF) channel
                                                                              (
km)         (km)         (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]


Goto Section: 73.805 | 73.808

Goto Year: 2004 | 2006
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