Goto Section: 74.703 | 74.706 | Table of Contents
FCC 74.705
Revised as of October 1, 2008
Goto Year:2007 |
2009
Sec. 74.705 TV broadcast analog station protection.
(a) The TV broadcast station protected contour will be its Grade B contour
signal level as defined in Sec. 73.683 and calculated from the authorized
maximum radiated power (without depression angle correction), the horizontal
radiation pattern, height above average terrain in the pertinent direction,
and the appropriate chart from Sec. 73.699.
(b)(1) An application to construct a new low power TV or TV translator
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 TV broadast 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 Sec. 73.603(a) of part 73 of this chapter.)
(3) A UHF low power TV or TV translator construction permit application will
not be accepted if it specifies a site within the UHF TV broadcast station's
protected contour and proposes operation on a channel either 14 or 15
channels above the channel in use by the TV broadcast station.
(4) A UHF low power TV or TV translator construction permit application will
not be accepted if it specifies a site less than 100 kilometers from the
transmitter site of a UHF TV broadcast analog station operating on a channel
which is the seventh channel above the requested channel, unless it can
demonstrate that the service area of the low power TV or TV translator
station as established in Sec. 74.707(a) is not located in an area where the TV
broadcast analog station is regularly viewed.
(5) An application for a new UHF low power TV or TV translator construction
permit, a change of channel, or a major change in facilities pursuant to
Sec. 73.3572 of this chapter proposing a maximum effective radiated power of
more than 50 kilowatts will not be accepted if it specifies a site less than
32 kilometers from the transmitter site of a UHF TV broadcast analog station
operating on a channel which is the second, third, or fourth channel above
or below the requested channel.
(c) The low power TV, TV translator, or TV booster station field strength is
calculated from the proposed effective radiated power (ERP) and the antenna
height above average terrain (HAAT) in pertinent directions.
(1) For co-channel protection, the field strength is calculated using Figure
9a, 10a, or 10c of Sec. 73.699 (F(50,10) charts) of Part 73 of this chapter.
(2) For low power TV, TV translator, and TV boosters that do not specify the
same channel as the TV broadcast station to be protected, the field strength
is calculated using Figure 9, 10, or 10b of Sec. 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 TV
broadcast station at the 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, 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 will be maintained within the tolerances specified in
Sec. 74.761 for offset operation.
(2) 6 dB when the protected TV broadcast station operates on a VHF channel
that is one channel above the requested channel.
(3) 12 dB when the protected TV broadcast station operates on a VHF channel
that is one channel below the requested channel.
(4) 15 dB when the protected TV broadcast station operates on a UHF channel
that is one channel above or below the requested channel.
(5) 23 dB when the protected TV broadcast station operates on a UHF channel
that is fourteen channels below the requested channel.
(6) 6 dB when the protected TV broadcast station operates a UHF channel that
is fifteen channels below the requested channel.
(e) As an alternative to the preceding paragraphs of 74.705, an applicant
for a low power TV, TV translator or TV booster 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 TV broadcast stations. Guidance on using the Longley-Rice
methodology is provided in OET Bulletin No. 69 (but also see Sec. 74.793(d)).
Copies of OET Bulletin No. 69 may be inspected during normal business hours
at the: Federal Communications Commission, 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 21497 , May 18, 1982, as amended at 48 FR 21487 , May 12, 1983; 52 FR 31403 , Aug. 20, 1987; 62 FR 26721 , May 14, 1997; 65 FR 58467 , Sept. 29,
2000; 69 FR 69332 , Nov. 29, 2004]
Goto Section: 74.703 | 74.706
Goto Year: 2007 |
2009
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