Goto Section: 73.212 | 73.215 | Table of Contents
FCC 73.213
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 73.213 Grandfathered short-spaced stations.
(a) Stations at locations authorized prior to November 16, 1964, that did
not meet the separation distances required by § 73.207 and have remained
continuously short-spaced since that time may be modified or relocated with
respect to such short-spaced stations, provided that (i) any area predicted
to receive interference lies completely within any area currently predicted
to receive co-channel or first-adjacent channel interference as calculated
in accordance with paragraph (a)(1) of this section, or that (ii) a showing
is provided pursuant to paragraph (a)(2) of this section that demonstrates
that the public interest would be served by the proposed changes.
(1) The F(50,50) curves in Figure 1 of § 73.333 are to be used in conjunction
with the proposed effective radiated power and antenna height above average
terrain, as calculated pursuant to § 73.313(c), (d)(2) and (d)(3), using data
for as many radials as necessary, to determine the location of the desired
(service) field strength. The F(50,10) curves in Figure 1a of § 73.333 are to
be used in conjunction with the proposed effective radiated power and
antenna height above average terrain, as calculated pursuant to § 73.313(c),
(d)(2) and (d)(3), using data for as many radials as necessary, to determine
the location of the undesired (interfering) field strength. Predicted
interference is defined to exist only for locations where the desired
(service) field strength exceeds 0.5 mV/m (54 dBu) for a Class B station,
0.7 mV/m (57 dBu) for a Class B1 station, and 1 mV/m (60 dBu) for any other
class of station.
(i) Co-channel interference is predicted to exist, for the purpose of this
section, at all locations where the undesired (interfering station) F(50,10)
field strength exceeds a value 20 dB below the desired (service) F(50,50)
field strength of the station being considered (e.g., where the protected
field strength is 60 dBu, the interfering field strength must be 40 dBu or
more for predicted interference to exist).
(ii) First-adjacent channel interference is predicted to exist, for the
purpose of this section, at all locations where the undesired (interfering
station) F(50,10) field strength exceeds a value 6 dB below the desired
(service) F(50,50) field strength of the station being considered (e.g.,
where the protected field strength is 60 dBu, the interfering field strength
must be 54 dBu or more for predicted interference to exist).
(2) For co-channel and first-adjacent channel stations, a showing that the
public interest would be served by the changes proposed in an application
must include exhibits demonstrating that the total area and population
subject to co-channel or first-adjacent channel interference, caused and
received, would be maintained or decreased. In addition, the showing must
include exhibits demonstrating that the area and the population subject to
co-channel or first-adjacent channel interference caused by the proposed
facility to each short-spaced station individually is not increased. In all
cases, the applicant must also show that any area predicted to lose service
as a result of new co-channel or first-adjacent-channel interference has
adequate aural service remaining. For the purpose of this section, adequate
service is defined as 5 or more aural services (AM or FM).
(3) For co-channel and first-adjacent-channel stations, a copy of any
application proposing interference caused in any areas where interference is
not currently caused must be served upon the licensee(s) of the affected
short-spaced station(s).
(4) For stations covered by this paragraph (a), there are no distance
separation or interference protection requirements with respect to
second-adjacent and third-adjacent channel short-spacings that have existed
continuously since November 16, 1964.
(b) Stations at locations authorized prior to May 17, 1989, that did not
meet the IF separation distances required by § 73.207 and have remained
short-spaced since that time may be modified or relocated provided that the
overlap area of the two stations' 36 mV/m field strength contours is not
increased.
(c) Short spacings involving at least one Class A allotment or
authorization. Stations that became short spaced on or after November 16,
1964 (including stations that do not meet the minimum distance separation
requirements of paragraph (c)(1) of this section and that propose to
maintain or increase their existing distance separations) may be modified or
relocated in accordance with paragraph (c)(1) or (c)(2) of this section,
except that this provision does not apply to stations that became short
spaced by grant of applications filed after October 1, 1989, or filed
pursuant to § 73.215. If the reference coordinates of an allotment are short
spaced to an authorized facility or another allotment (as a result of the
revision of § 73.207 in the Second Report and Order in MM Docket No. 88-375),
an application for the allotment may be authorized, and subsequently
modified after grant, in accordance with paragraph (c)(1) or (c)(2) of this
section only with respect to such short spacing. No other stations will be
authorized pursuant to these paragraphs.
(1) Applications for authorization under requirements equivalent to those of
prior rules. Each application for authority to operate a Class A station
with no more than 3000 watts ERP and 100 meters antenna HAAT (or equivalent
lower ERP and higher antenna HAAT based on a class contour distance of 24
km) must specify a transmitter site that meets the minimum distance
separation requirements in this paragraph. Each application for authority to
operate a Class A station with more than 3000 watts ERP (up to a maximum of
5800 watts), but with an antenna HAAT lower than 100 meters such that the
distance to the predicted 0.05 mV/m (34 dBµV/m) F(50,10) field strength
contour does not exceed 98 km must specify a transmitter site that meets the
minimum distance separation requirements in this paragraph. Each application
for authority to operate an FM station of any class other than Class A must
specify a transmitter site that meets the minimum distance separation
requirements in this paragraph with respect to Class A stations operating
pursuant to this paragraph or paragraph (c)(2) of this section, and that
meets the minimum distance separation requirements of § 73.207 with respect
to all other stations.
Minimum Distance Separation Requirements in Kilometers (miles)
Relation Co-channel 200 kHz 400/600 kHz 10.6/10.8 MHz
A to A 105 (65) 64 (40) 27 (17) 8 (5)
A to B1 138 (86) 88 (55) 48 (30) 11 (6)
A to B 163 (101) 105 (65) 69 (43) 14 (9)
A to C3 138 (86) 84 (52) 42 (26) 11 (6)
A to C2 163 (101) 105 (65) 55 (34) 14 (9)
A to C1 196 (122) 129 (80) 74 (46) 21 (13)
A to C 222 (138) 161 (100) 94 (58) 28 (17)
(2) Applications for authorization of Class A facilities greater than 3,000
watts ERP and 100 meters HAAT. Each application to operate a Class A station
with an ERP and HAAT such that the reference distance would exceed 24
kilometers must contain an exhibit demonstrating the consent of the licensee
of each co-channel, first, second or third adjacent channel station (for
which the requirements of § 73.207 are not met) to a grant of that
application. Each such application must specify a transmitter site that
meets the applicable IF-related channel distance separation requirements of
§ 73.207. Applications that specify a new transmitter site which is
short-spaced to an FM station other than another Class A station which is
seeking a mutual increase in facilities may be granted only if no
alternative fully-spaced site or less short-spaced site is available.
Licensees of Class A stations seeking mutual increases in facilities need
not show that a fully spaced site or less short-spaced site is available.
Applications submitted pursuant to the provisions of this paragraph may be
granted only if such action is consistent with the public interest.
[ 52 FR 37789 , Oct. 9, 1987, as amended at 54 FR 14964 , Apr. 14, 1989; 54 FR 35339 , Aug. 25, 1989; 56 FR 27426 , June 14, 1991; 62 FR 50521 , Sept. 26,
1997; 63 FR 33876 , June 22, 1998]
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Goto Section: 73.212 | 73.215
Goto Year: 2014 |
2016
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