Goto Section: 74.706 | 74.708 | Table of Contents
FCC 74.707
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 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]
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Goto Section: 74.706 | 74.708
Goto Year: 2014 |
2016
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