Goto Section: 74.1203 | 74.1205 | Table of Contents
FCC 74.1204
Revised as of October 1, 2008
Goto Year:2007 |
2009
Sec. 74.1204 Protection of FM broadcast, FM Translator and LP100 stations.
(a) An application for an FM translator station will not be accepted for
filing if the proposed operation would involve overlap of predicted field
contours with any other authorized commercial or noncommercial educational
FM broadcast stations, FM translators, and Class D (secondary) noncommercial
educational FM stations; or if it would result in new or increased overlap
with an LP100 station, as set forth:
(1) Commercial Class B FM Stations (Protected Contour: 0.5 mV/m)
Frequency separation Interference contour of proposed translator station
Protected contour of commercial Class B station
Co-channel 0.05 mV/m (34 dBu) 0.5 mV/m (54 dBu)
200 kHz 0.25 mV/m (48 dBu) 0.5 mV/m (54 dBu)
400 kHz/ 600 kHz 50.0 mV/m (94 dBu) 0.5 mV/m (54 dBu)
(2) Commercial Class B1 FM Stations (Protected Contour: 0.7 mV/m)
Frequency separation Interference contour of proposed translator station
Protected contour of commercial Class B1 station
Co-channel 0.07 mV/m (37 dBu) 0.7 mV/m (57 dBu)
200 kHz 0.35 mV/m (51 dBu) 0.5 mV/m (57 dBu)
400 kHz/ 600 kHz 70.0 mV/m (97 dBu) 0.7 mV/m (57 dBu)
(3) All Other Classes of FM Stations (Protected Contour: 1 mV/m)
Frequency separation Interference contour of proposed translator Protected
contour of any other station
Co-channel 0.1 mV/m (40 dBu) 1 mV/m (60 dBu)
200 kHz 0.5 mV/m (54 dBu) 1 mV/m (60 dBu)
400 kHz/ 600 kHz 100 mV/m (100 dBu) 1 mV/m (60 dBu)
(4) LP100 stations (Protected Contour: 1 mV/m)
Frequency separation Interference contour of proposed translator
station Protected contour of LP100 LPFM station
Co-channel 0.1 mV/m (40 dBu) 1 mV/m (60 dBu)
200 kHz 0.5 mV/m (54 dBu) 1 mV/m (60 dBu)
Note to paragraph(a)(4): LP100 stations, to the purposes of determining
overlap pursuant to this paragraph, LPFM applications and permits that have
not yet been licensed must be considered as operating with the maximum
permitted facilities. All LPFM TIS stations must be protected on the basis
of a nondirectional antenna.
(b) The following standards must be used to compute the distances to the
pertinent contours:
(1) The distances to the protected contours are computed using Figure 1 of
Sec. 73.333 [F(50,50) curves] of this chapter.
(2) The distances to the interference contours are computed using Figure 1a
of Sec. 73.333 [F(50,10) curves] of this chapter. In the event that the distance
to the contour is below 16 kilometers (approximately 10 miles), and
therefore not covered by Figure 1a, curves in Figure 1 must be used.
(3) The effective radiated power (ERP) to be used is the maximum ERP of the
main radiated lobe in the pertinent azimuthal direction. If the transmitting
antenna is not horizontally polarized only, either the vertical component or
the horizontal component of the ERP should be used, whichever is greater in
the pertinent azimuthal direction.
(4) The antenna height to be used is the height of the radiation center
above the average terrain along each pertinent radial, determined in
accordance with Sec. 73.313(d) of this chapter.
(c) An application for a change (other than a change in channel) in the
authorized facilities of an FM translator station will be accepted even
though overlap of field strength contours would occur with another station
in an area where such overlap does not already exist, if:
(1) The total area of overlap with that station would not be increased:
(2) The area of overlap with any other station would not increase;
(3) The area of overlap does not move significantly closer to the station
receiving the overlap; and,
(4) No area of overlap would be created with any station with which the
overlap does not now exist.
(d) The provisions of this section concerning prohibited overlap will not
apply where the area of such overlap lies entirely over water. In addition,
an application otherwise precluded by this section will be accepted if it
can be demonstrated that no actual interference will occur due to
intervening terrain, lack of population or such other factors as may be
applicable.
(e) The provisions of this section will not apply to overlap between a
proposed fill-in FM translator station and its primary station operating on
a first, second or third adjacent channel, provided That such operation may
not result in interference to the primary station within its principal
community.
(f) An application for an FM translator station will not be accepted for
filing even though the proposed operation would not involve overlap of field
strength contours with any other station, as set forth in paragraph (a) of
this section, if the predicted 1 mV/m field strength contour of the FM
translator station will overlap a populated area already receiving a
regularly used, off-the-air signal of any authorized co-channel, first,
second or third adjacent channel broadcast station, including Class D
(secondary) noncommercial educational FM stations and grant of the
authorization will result in interference to the reception of such signal.
(g) An application for an FM translator or an FM booster station that is 53
or 54 channels removed from an FM radio broadcast station will not be
accepted for filing if it fails to meet the required separation distances
set out in Sec. 73.207 of this chapter. For purposes of determining compliance
with Sec. 73.207 of this chapter, translator stations will be treated as Class A
stations and booster stations will be treated the same as their FM radio
broadcast station equivalents. FM radio broadcast station equivalents will
be determined in accordance with Sec. Sec. 73.210 and 73.211 of this chapter, based
on the booster station's ERP and HAAT. Provided, however, that FM translator
stations and booster stations operating with less than 100 watts ERP will be
treated as class D stations and will not be subject to intermediate
frequency separation requirements.
(h) An application for an FM translator station will not be accepted for
filing if it specifies a location within 320 kilometers (approximately 199
miles) of either the Canadian or Mexican borders and it does not comply with
Sec. 74.1235(d) of this part.
(i) FM booster stations shall be subject to the requirement that the signal
of any first adjacent channel station must exceed the signal of the booster
station by 6 dB at all points within the protected contour of any first
adjacent channel station, except that in the case of FM stations on adjacent
channels at spacings that do not meet the minimum distance separations
specified in Sec. 73.207 of this chapter, the signal of any first adjacent
channel station must exceed the signal of the booster by 6 dB at any point
within the predicted interference free contour of the adjacent channel
station.
(j) FM translator stations authorized prior to June 1, 1991 with facilities
that do not comply with the predicted interference protection provisions of
this section, may continue to operate, provided that operation is in
conformance with Sec. 74.1203 regarding actual interference. Applications for
major changes in FM translator stations must specify facilities that comply
with provisions of this section.
[ 55 FR 50694 , Dec. 10, 1990, as amended at 56 FR 56170 , Nov. 1, 1991; 58 FR 42025 , Aug. 6, 1993; 65 FR 7649 , Feb. 15, 2000; 65 FR 67304 , Nov. 9, 2000;
65 FR 79780 , Dec. 20, 2000]
Goto Section: 74.1203 | 74.1205
Goto Year: 2007 |
2009
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