Goto Section: 73.213 | 73.220 | Table of Contents
FCC 73.215
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 73.215 Contour protection for short-spaced assignments.
The Commission will accept applications that specify short-spaced antenna
locations (locations that do not meet the domestic co-channel and adjacent
channel minimum distance separation requirements of § 73.207); Provided That,
such applications propose contour protection, as defined in paragraph (a) of
this section, with all short-spaced assignments, applications and
allotments, and meet the other applicable requirements of this section. Each
application to be processed pursuant to this section must specifically
request such processing on its face, and must include the necessary exhibit
to demonstrate that the requisite contour protection will be provided. Such
applications may be granted when the Commission determines that such action
would serve the public interest, convenience, and necessity.
(a) Contour protection. Contour protection, for the purpose of this section,
means that on the same channel and on the first, second and third adjacent
channels, the predicted interfering contours of the proposed station do not
overlap the predicted protected contours of other short-spaced assignments,
applications and allotments, and the predicted interfering contours of other
short-spaced assignments, applications and allotments do not overlap the
predicted protected contour of the proposed station.
(1) The protected contours, for the purpose of this section, are defined as
follows. For all Class B and B1 stations on Channels 221 through 300
inclusive, the F(50,50) field strengths along the protected contours are 0.5
mV/m (54 dBµ) and 0.7 mV/m (57 dBµ), respectively. For all other stations,
the F(50,50) field strength along the protected contour is 1.0 mV/m (60
dBµ).
(2) The interfering contours, for the purpose of this section, are defined
as follows. For co-channel stations, the F(50,10) field strength along the
interfering contour is 20 dB lower than the F(50,50) field strength along
the protected contour for which overlap is prohibited. For first adjacent
channel stations (±200 kHz), the F(50,10) field strength along the
interfering contour is 6 dB lower than the F(50,50) field strength along the
protected contour for which overlap is prohibited. For both second and third
adjacent channel stations (±400 kHz and ±600 kHz), the F(50,10) field
strength along the interfering contour is 40 dB higher than the F(50,50)
field strength along the protected contour for which overlap is prohibited.
(3) The locations of the protected and interfering contours of the proposed
station and the other short-spaced assignments, applications and allotments
must be determined in accordance with the procedures of paragraphs (c),
(d)(2) and (d)(3) of § 73.313, using data for as many radials as necessary to
accurately locate the contours.
(4) Protected and interfering contours (in dBu) for stations in Puerto Rico
and the U.S. Virgin Islands are as follows:
Station with interfering contour Station with protected contour
Class A Class B1 Class B
Interfering Protected Interfering Protected Interfering Protected
Co-Channel:
Class A 46 66 41 61 40 60
Class B1 43 63 39 59 38 58
Class B 45 65 41 61 41 61
1st Adj. Channel:
Class A 61 67 56 62 59 65
Class B1 57 63 54 60 54 60
Class B 62 68 56 62 57 63
2nd-3rd Adj. Channel:
Class A 107 67 100 60 104 64
Class B1 99 59 100 60 104 64
Class B 94 54 94 54 104 64
Maximum permitted facilities assumed for each station pursuant to 47 CFR
73.211(b)(3):
6 kW ERP/240 meters HAAT—Class A
25 kW ERP/150 meters HAAT—Class B1
50 kW ERP/472 meters HAAT—Class B
(b) Applicants requesting short-spaced assignments pursuant to this section
must take into account the following factors in demonstrating that contour
protection is achieved:
(1) The ERP and antenna HAAT of the proposed station in the direction of the
contours of other short-spaced assignments, applications and allotments. If
a directional antenna is proposed, the pattern of that antenna must be used
to calculate the ERP in particular directions. See § 73.316 for additional
requirements for directional antennas.
(2) The ERP and antenna HAAT of other short-spaced assignments, applications
and allotments in the direction of the contours of the proposed station. The
ERP and antenna HAATs in the directions of concern must be determined as
follows:
(i) For vacant allotments, contours are based on the presumed use, at the
allotment's reference point, of the maximum ERP that could be authorized for
the station class of the allotment, and antenna HAATs in the directions of
concern that would result from a non-directional antenna mounted at a
standard eight-radial antenna HAAT equal to the reference HAAT for the
station class of the allotment.
(ii) For existing stations that were not authorized pursuant to this
section, including stations with authorized ERP that exceeds the maximum ERP
permitted by § 73.211 for the standard eight-radial antenna HAAT employed,
and for applications not requesting authorization pursuant to this section,
contours are based on the presumed use of the maximum ERP for the applicable
station class (as specified in § 73.211), and the antenna HAATs in the
directions of concern that would result from a non-directional antenna
mounted at a standard eight-radial antenna HAAT equal to the reference HAAT
for the applicable station class, without regard to any other restrictions
that may apply (e.g. zoning laws, FAA constraints, application of § 73.213).
(iii) For stations authorized pursuant to this section, except stations with
authorized ERP that exceeds the maximum ERP permitted by § 73.211 for the
standard eight-radial antenna HAAT employed, contours are based on the use
of the authorized ERP in the directions of concern, and HAATs in the
directions of concern derived from the authorized standard eight-radial
antenna HAAT. For stations with authorized ERP that exceeds the maximum ERP
permitted by § 73.211 for the standard eight-radial antenna HAAT employed,
authorized under this section, contours are based on the presumed use of the
maximum ERP for the applicable station class (as specified in § 73.211), and
antenna HAATs in the directions of concern that would result from a
non-directional antenna mounted at a standard eight-radial antenna HAAT
equal to the reference HAAT for the applicable station class, without regard
to any other restrictions that may apply.
(iv) For applications containing a request for authorization pursuant to
this section, except for applications to continue operation with authorized
ERP that exceeds the maximum ERP permitted by § 73.211 for the standard
eight-radial antenna HAAT employed, contours are based on the use of the
proposed ERP in the directions of concern, and antenna HAATs in the
directions of concern derived from the proposed standard eight-radial
antenna HAAT. For applications to continue operation with an ERP that
exceeds the maximum ERP permitted by § 73.211 for the standard eight-radial
HAAT employed, if processing is requested under this section, contours are
based on the presumed use of the maximum ERP for the applicable station
class (as specified in § 73.211), and antenna HAATs in the directions of
concern that would result from a nondirectional antenna mounted at a
standard eight-radial antenna HAAT equal to the reference HAAT for the
applicable station class, without regard to any other restrictions that may
apply.
Note to paragraph (b): Applicants are cautioned that the antenna HAAT in any
particular direction of concern will not usually be the same as the standard
eight-radial antenna HAAT or the reference HAAT for the station class.
(c) Applications submitted for processing pursuant to this section are not
required to propose contour protection of any assignment, application or
allotment for which the minimum distance separation requirements of § 73.207
are met, and may, in the directions of those assignments, applications and
allotments, employ the maximum ERP permitted by § 73.211 for the standard
eight-radial antenna HAAT employed.
(d) Stations authorized pursuant to this section may be subsequently
authorized on the basis of compliance with the domestic minimum separation
distance requirements of § 73.207, upon filing of an FCC Form 301 or FCC Form
340 (as appropriate) requesting a modification of authorization.
(e) The Commission will not accept applications that specify a short-spaced
antenna location for which the following minimum distance separation
requirements, in kilometers (miles), are not met:
Relation Co-Channel 200 kHz 400/600 kHz
A to A 92 (57) 49 (30) 25 (16)
A to B1 119 (74) 72 (45) 42 (26)
A to B 143 (89) 96 (60) 63 (39)
A to C3 119 (74) 72 (45) 36 (22)
A to C2 143 (89) 89 (55) 49 (30)
A to C1 178 (111) 111 (69) 69 (43)
A to C0 193 (120) 130 (81) 80 (50)
A to C 203 (126) 142 (88) 89 (55)
B1 to B1 143 (89) 96 (60) 44 (27)
B1 to B 178 (111) 114 (71) 65 (40)
B1 to C3 143 (89) 96 (60) 44 (27)
B1 to C2 175 (109) 114 (71) 50 (31)
B1 to C1 200 (124) 134 (83) 71 (44)
B1 to C0 0215 (134) 153 (95) 81 (50)
B1 to C 233 (145) 165 (103) 99 (61)
B to B 211 (131) 145 (90) 68 (42)
B to C3 178 (111) 114 (70) 65 (40)
B to C2 211 (131) 145 (90) 68 (42)
B to C1 241 (150) 169 (105) 73 (45)
B to C0 266 (165) 195 (121) 83 (52)
B to C 268 (163) 195 (121) 99 (61)
C3 to C3 142 (88) 89 (55) 37 (23)
C3 to C2 166 (103) 106 (66) 50 (31)
C3 to C1 200 (124) 133 (83) 70 (43)
C3to C0 215 (134) 152 (94) 81 (50)
C3 to C 226 (140) 165 (103) 90 (56)
C2 to C2 177 (110) 117 (73) 52 (32)
C2 to C1 211 (131) 144 (90) 73 (45)
C2 to C0 227 (141) 163 (101) 83 (52)
C2 to C 237 (147) 176 (109) 96 (61)
C1 to C1 224 (139) 158 (98) 76 (47)
C1 to C0 239 (148) 176 (109) 88 (55)
C1 to C 249 (155) 188 (117) 99 (61)
C0 to C0 259 (161) 196 (122) 90 (56)
C0 to C 270 (168) 207 (129 99 (61)
C to C 270 (168) 209 (130) 99 (61)
[ 54 FR 9802 , Mar. 8, 1989, as amended at 54 FR 35340 , Aug. 25, 1989; 56 FR 57294 , Nov. 8, 1991; 57 FR 46325 , Oct. 8, 1992; 65 FR 79777 , Dec. 20, 2000;
66 FR 8149 , Jan. 29, 2001]
return arrow Back to Top
Goto Section: 73.213 | 73.220
Goto Year: 2014 |
2016
CiteFind - See documents on FCC website that
cite this rule
Want to support this service?
Thanks!
Report errors in
this rule. Since these rules are converted to HTML by machine, it's possible errors have been made. Please
help us improve these rules by clicking the Report FCC Rule Errors link to report an error.
hallikainen.com
Helping make public information public