Goto Section: 73.212 | 73.215 | Table of Contents
FCC 73.213
Revised as of October 1, 2011
Goto Year:2010 |
2012
§ 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 dBuV/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]
Goto Section: 73.212 | 73.215
Goto Year: 2010 |
2012
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