Goto Section: 101.113 | 101.117 | Table of Contents

FCC 101.115
Revised as of October 1, 2005
Goto Year:2004 | 2006
Sec.  101.115   Directional antennas.

   (a) Unless otherwise authorized upon specific request by the applicant, each
   station authorized under the rules of this part must employ a directional
   antenna adjusted with the center of the major lobe of radiation in the
   horizontal plane directed toward the receiving station with which it
   communicates: provided, however, where a station communicates with more than
   one point, a multi- or omni-directional antenna may be authorized if
   necessary. New Periscope antenna systems will not, under ordinary
   circumstances, be authorized.

   (b) Fixed stations (other than temporary fixed stations and DEMS nodal
   stations) operating at 932.5 MHz or higher must employ transmitting and
   receiving antennas (excluding second receiving antennas for operations such
   as space diversity) meeting the appropriate performance Standard A indicated
   below, except that in areas not subject to frequency congestion, antennas
   meeting performance Standard B may be used, subject to the requirements set
   forth in paragraph (d) of this section. Licensees shall comply with the
   antenna standards table shown in this paragraph in the following manner:

   (1) With either the maximum beamwidth to 3 dB points requirement or with the
   minimum antenna gain requirement; and

   (2) With the minimum radiation suppression to angle requirement.

                                                                    Antenna Sta
ndards
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                                                                   Maximum
        Minimum radiation suppression to angle in degrees from centerline
                                                                  beamwidth
                            of main beam in decibels
                                                                   to 3 dB   Mi
nimum -------------------------------------------------------------------
                                                                    points   an
tenna
             Frequency (MHz)                      Category           \1\
gain              10 °  15 °  20 °   30 °  100 °  140 °
                                                                  (included   (
dbi)     5 °      to       to       to       to        to        to
                                                                   angle in
       to10 °  15 °  20 °  30 °  100 °  140 °  180 °
                                                                   degrees)
-------------------------------------------------------------------------------
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932.5 to 935.............................  A                          14.0
  n/a       n/a         6       11       14        17        20        24
                                           B                          20.0
  n/a       n/a       n/a        6       10        13        15        20
941.5 to 944.............................  A                          14.0
  n/a       n/a         6       11       14        17        20        24
                                           B                          20.0
  n/a       n/a       n/a        6       10        13        15        20
952 to 960 2, 3..........................  A                          14.0
  n/a       n/a         6       11       14        17        20        24
                                           B                          20.0
  n/a       n/a       n/a        6       10        13        15        20
1,850 to 2,500 \4\.......................  A                           5.0
  n/a        12        18       22       25        29        33        39
                                           B                           8.0
  n/a         5        18       20       20        25        28        36
3,700 to 4,200...........................  A                           2.7
   36        23        29       33       36        42        55        55
                                           B                           2.7
   36        20        24       28       32        32        32        32
5,925 to 6,425 \5\.......................  A                           2.2
   38        25        29       33       36        42        55        55
                                           B                           2.2
   38        21        25       29       32        35        39        45
5,925 to 6,425 \6\.......................  A                           2.2
   38        25        29       33       36        42        55        55
                                           B                           2.2
   38        20        24       28       32        35        36        36
6,525 to 6,875 \5\.......................  A                           2.2
   38        25        29       33       36        42        55        55
                                           B                           2.2
   38        21        25       29       32        35        39        45
6,525 to 6,875 \6\.......................  A                           1.5
  n/a        26        29       32       34        38        41        49
                                           B                           2.0
  n/a        21        25       29       32        35        39        45
10,550 to 10,680 5, 7....................  A                           2.2
   38        25        29       33       36        42        55        55
                                           B                           2.2
   38        20        24       28       32        35        35        39
10,550 to 10,680 \7\.....................  A                           3.5
 33.5        18        24       28       32        35        55        55
                                           B                           3.5
 33.5        17        24       28       32        35        40        45
10,565 to 10,615.........................  n/a                         360
  n/a       n/a       n/a      n/a      n/a       n/a       n/a       n/a
10,630 to 10,680\8\......................  n/a                         3.5
   34        20        24       28       32        35        36        36
10,700 to 11,700 \5\.....................  A                           2.2
   38        25        29       33       36        42        55        55
                                           B                           2.2
   38        20        24       28       32        35        36        36
12,200 to 13,250 \9\.....................  A                           1.0
  n/a        23        28       35       39        41        42        50
                                           B                           2.0
  n/a        20        25       28       30        32        37        47
17,700 to 18,820.........................  A                           2.2
   38        25        29       33       36        42        55        55
                                           B                           2.2
   38        20        24       28       32        35        36        36
18,920 to 19,700 \10\....................  A                           2.2
   38        25        29       33       36        42        55        55
                                           B                           2.2
   38        20        24       28       32        35        36        36
21,200 to 23,600 7,11....................  A                           3.3
 33.5        18        26       26       33        33        55        55
                                           B                           3.3
 33.5        17        24       24       29        29        40        50
24,250 to 25,250 \10\....................  A                           2.8
   38        25        29       33       36        42        55        60
                                           B                           2.8
   38        20        24       28       32        35        36        45
31,000 to 31,300 12, 13..................  n/a                         4.0
   38       n/a       n/a      n/a      n/a       n/a       n/a       n/a
38,600 to 40,000 \14\....................  A                           n/a
   38        25        29       33       36        42        55        55
                                           B                           n/a
   38        20        24       28       32        35        36        36
71,000 to 76,000 (co-polar) \15\.........  N/A                         1.2
   43        35        40       45       50        50        55        55
71,000 to 76,000 (cross-polar) \15\......  N/A                         1.2
   43        45        50       50       55        55        55        55
81,000 to 86,000 (co-polar) \15\.........  N/A                         1.2
   43        35        40       45       50        50        55        55
81,000 to 86,000 (cross-polar) \15\......  N/A                         1.2
   43        45        50       50       55        55        55        55
92,000 to 95,000.........................  N/A                         0.6
 50.0        36        40       45       50        55        55        55
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\1\ If a licensee chooses to show compliance using maximum beamwidth to 3 dB po
ints, the beamwidth limit shall apply in both the azimuth and the
  elevation planes.
\2\ Except for Multiple Address System frequencies listed in  Sec.  Sec.  101.147(b)(1) t
hrough (b)(4), where omnidirectional antennas may be used.
\3\ Antennas used at outlying stations as part of a central protection alarm sy
stem need conform to only the following 2 standards:
(i) The minimum on-beam forward gain must be at least 10 dBi, and
(ii) The minimum front-to-back ratio must be at least 20 dB.
\4\ Omnidirectional antennas may be authorized in the band 2150-2160 MHz.
\5\ These antenna standards apply to all point-to-point stations authorized aft
er June 1, 1997. Existing licensees and pending applicants on that date
  are grandfathered and need not comply with these standards.
\6\ These antenna standards apply to all point-to-point stations authorized on
or before June 1, 1997.
\7\ Except for antennas between 140 ° and 180 ° authorized or pending on January
1, 1989, in the band 10,550 to 10,565 MHz for which minimum
  radiation suppression to angle (in degrees) from centerline of main beam is 3
6 decibels.
\8\ These antenna standards apply only to DEMS User Stations licensed, in opera
tion, or applied for prior to July 15, 1993.
\9\ Except for Temporary-fixed operations in the band 13200-13250 MHz with outp
ut powers less than 250 mW and as provided in  Sec.  101.147(q), and
  except for antennas in the MVDDS service in the band 12.2-12.7 GHz.
\10\ DEMS User Station antennas in this band must meet performance Standard B a
nd have a minimum antenna gain of 34 dBi. The maximum beamwidth
  requirement does not apply to DEMS User Stations. DEMS Nodal Stations need no
t comply with these standards. Stations authorized to operate in the
  24,250-25,250 MHz band do not have to meet these standards, however, the Comm
ission may require the use of higher performance antennas where
  interference problems can be resolved by the use of such antennas.
\11\ Except as provided in  Sec.  101.147(s).
\12\ The minimum front-to-back ratio shall be 38 dBi.
\13\ Mobile, except aeronautical mobile, stations need not comply with these st
andards.
\14\ Stations authorized to operate in the 38,600-40,000 MHz band may use anten
nas other than those meeting the Category A standard. However, the
  Commission may require the use of higher performance antennas where interfere
nce problems can be resolved by the use of such antennas.
\15\ Antenna gain less than 50 dBi (but greater than or equal to 43 dBi) is per
mitted only with a proportional reduction in maximum authorized EIRP in a
  ratio of 2 dB of power per 1 dB of gain, so that the maximum allowable EIRP (
in dBW) for antennas of less than 50 dBi gain becomes +55-2(50-G), where
  G is the antenna gain in dBi. In addition, antennas in these bands must meet
two additional standards for minimum radiation suppression: At angles
  between 1.2 and 5 degrees from the centerline of the main beam, co-polar disc
rimination must be G-28, where G is the antenna gain in dBi; and at
  angles of less than 5 degrees from the centerline of main beam, cross-polar d
iscrimination must be at least 25 dB.

   (c) The Commission shall require the replacement of any antenna or periscope
   antenna system of a permanent fixed station operating at 932.5 MHz or higher
   that does not meet performance Standard A specified in paragraph (c) of this
   section, at the expense of the licensee operating such antenna, upon a
   showing that said antenna causes or is likely to cause interference to (or
   receive interference from) any other authorized or applied for station
   whereas a higher performance antenna is not likely to involve such
   interference. Antenna performance is expected to meet the standards of
   paragraph (c) of this section for parallel polarization. For cases of
   potential interference, an antenna will not be considered to meet Standard A
   unless the parallel polarization performance for the discrimination angle
   involved meets the requirements, even if the cross-polarization performance
   controls the interference.

   (d) In cases where passive reflectors are employed in conjunction with
   transmitting antenna systems, the foregoing paragraphs of this section also
   will be applicable. However, in such instances, the center of the major lobe
   of radiation from the antenna normally must be directed at the passive
   reflector, and the center of the major lobe of radiation from the passive
   reflector directed toward the receiving station with which it communicates.

   (e) Periscope antennas used at an electric power facility plant area will be
   excluded from the requirements of paragraph (c) of this section on a
   case-by-case basis where technical considerations or safety preclude the use
   of other types of antenna systems.

   (f) In the event harmful interference is caused to the operation of other
   stations, the Commission may, after notice and opportunity for hearing,
   order changes to be made in the height, orientation, gain and radiation
   pattern of the antenna system.

   [ 61 FR 26677 , May 28, 1996, as amended at  62 FR 4924 , Feb. 3, 1997;  62 FR 24582 , May 6, 1997;  63 FR 6105 , Feb. 6, 1998;  65 FR 38329 , June 20, 2000;  65 FR 59358 , Oct. 5, 2000;  67 FR 43038 , June 26, 2002;  68 FR 4957 , Jan. 31,
   2003;  69 FR 3267 , Jan. 23, 2004;  70 FR 29997 , May 25, 2005]


Goto Section: 101.113 | 101.117

Goto Year: 2004 | 2006
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