Goto Section: 74.706 | 74.708 | Table of Contents
FCC 74.707
Revised as of October 1, 2010
Goto Year:2009 |
2011
§ 74.707 Low power TV and TV translator station protection.
(a)(1) A low power TV or TV translator will be protected from
interference from other low power TV or TV translator stations, or TV
booster stations within the following predicted contours:
(i) 62 dBu for stations on Channels 2 through 6;
(ii) 68 dBu for stations on Channels 7 through 13; and
(iii) 74 dBu for stations on Channels 14 through 69.
Existing licensees and permittees that did not furnish sufficient data
required to calculate the above contours by April 15, 1983 are assigned
protected contours having the following radii:
Up to 0.001 kW VHF/UHF--1 mile (1.6 km) from transmitter site
Up to 0.01 kW VHF; up to 0.1 k/W UHF--2 miles (3.2 km) from transmitter
site
Up to 0.1 kW VHF; up to 1 kW UHF--4 miles (6.4 km) from transmitter
site
New applicants must submit the required information; they cannot rely
on this table.
(2) The low power TV or TV translator station protected contour is
calculated from the authorized effective radiated power and antenna
height above average terrain, using Figure 9, 10, or 10b of § 73.699
(F(50,50) charts) of Part 73 of this chapter.
(b)(1) An application to construct a new low power TV, TV translator,
or TV booster station or change the facilities of an existing station
will not be accepted if it specifies a site which is within the
protected contour of a co-channel or first adjacent channel low power
TV, TV translator, or TV booster station, except that a TV booster
station may be located within the protected contour of its co-channel
primary station.
(2) Due to the frequency spacing which exists between TV Channels 4 and
5, between Channels 6 and 7, and between Channels 13 and 14, adjacent
channel protection standards shall not be applicable to these pairs of
channels. (See § 73.603(a) of Part 73 of this chapter.)
(3) A UHF low power TV, TV translator, or TV booster construction
permit application will not be accepted if it specifies a site within
the UHF low power TV, TV translator, or TV booster station's protected
contour and proposes operation on a channel that is 15 channels above
the channel in use by the low power TV, TV translator, or TV booster
station.
(c) The low power TV, TV translator, or TV booster construction permit
application field strength is calculated from the proposed effective
radiated power (ERP) and the antenna above average terrain (HAAT) in
pertinent directions.
(1) For co-channel protection, the field strength is calculated using
Figure 9a, 10a, or 10c of § 73.699 (F(50,10) charts) of Part 73 of this
chapter.
(2) For low power TV, TV translator, or TV booster applications that do
not specify the same channel as the low power TV, TV translator, or TV
booster station to be protected, the field strength is calculated using
Figure 9, 10, or 10b of § 73.699 (F(50,50) charts) of Part 73 of this
chapter.
(d) A low power TV, TV translator, or TV booster station application
will not be accepted if the ratio in dB of its field strength to that
of the authorized low power TV, TV translator, or TV booster station at
its protected contour fails to meet the following:
(1) -45 dB for co-channel operations without offset carrier frequency
operation or -28 dB for offset carrier frequency operation. An
application requesting offset carrier frequency operation must include
the following:
(i) A requested offset designation (zero, plus, or minus) identifying
the proposed direction of the 10 kHz offset from the standard carrier
frequencies of the requested channel. If the offset designation is not
different from that of the station being protected, or if the station
being protected is not maintaining its frequencies within the tolerance
specified in § 74.761 for offset operation, the -45 dB ratio must be
used.
(ii) A description of the means by which the low power TV, TV
translator, or TV booster station's frequencies will be maintained
within the tolerances specified in § 74.761 for offset operation.
(2) 6 dB when the protected low power TV or TV translator station
operates on a VHF channel that is one channel above the requested
channel.
(3) 12 dB when the protected low power TV or TV translator station
operates on a VHF channel that is one channel below the requested
channel.
(4) 15 dB when the protected low power TV or TV translator station
operates on a UHF channel that is one channel above or below the
requested channel.
(5) 6 dB when the protected low power TV or TV translator station
operates on a UHF channel that is fifteen channels below the requested
channel.
(e) As an alternative to the preceding paragraphs of § 74.707, an
applicant for a low power TV or TV translator station may make full use
of terrain shielding and Longley-Rice terrain dependent propagation
prediction methods to demonstrate that the proposed facility would not
be likely to cause interference to low power TV, TV translator and TV
booster stations. Guidance on using the Longley-Rice methodology is
provided in OET Bulletin No. 69 (but also see § 74.793(d)). Copies of
OET Bulletin No. 69 may be inspected during normal business hours at
the: Federal Communications Commission, Room CY-C203, 445 12th Street,
SW., Reference Information Center, Washington, DC 20554. This document
is also available through the Internet on the FCC Home Page at
http://www.fcc.gov.
[ 47 FR 21498 , May 18, 1982, as amended at 47 FR 35990 , Aug. 18, 1982;
48 FR 21487 , May 12, 1983; 52 FR 31403 , Aug. 20, 1987; 62 FR 26722 , May
14, 1997; 65 FR 58467 , Sept. 29, 2000; 69 FR 69332 , Nov. 29, 2004]
Goto Section: 74.706 | 74.708
Goto Year: 2009 |
2011
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