Goto Section: 73.1020 | 73.1120 | Table of Contents
FCC 73.1030
Revised as of October 1, 2008
Goto Year:2007 |
2009
Sec. 73.1030 Notifications concerning interference to radio astronomy, research
and receiving installations.
(a)(1) Radio astronomy and radio research installations. In order to
minimize harmful interference at the National Radio Astronomy Observatory
site located at Green, Pocahontas County, West Virginia, and at the Naval
Radio Research Observatory at Sugar Grove, Pendleton County, West Virginia,
a licensee proposing to operate a short-term broadcast auxiliary station
pursuant to Sec. 74.24, and any applicant for authority to construct a new
broadcast station, or for authority to make changes in the frequency, power,
antenna height, or antenna directivity of an existing station within the
area bounded by 39 °15' N on the north, 78 °30' W on the east, 37 °30' N on the
south, and 80 °30' W on the west, shall notify the Interference Office,
National Radio Astronomy Observatory, P.O. Box 2, Green Bank, West Virginia
24944. Telephone: (304) 456–2011. The notification shall be in writing and
set forth the particulars of the proposed station, including the
geographical coordinates of the antenna, antenna height, antenna directivity
if any, proposed frequency, type of emission and power. The notification
shall be made prior to, or simultaneously with, the filing of the
application with the Commission. After receipt of such applications, the FCC
will allow a period of 20 days for comments or objections in response to the
notifications indicated. If an objection to the proposed operation is
received during the 20-day period from the National Radio Astronomy
Observatory for itself, or on behalf of the Naval Radio Research
Observatory, the FCC will consider all aspects of the problem and take
whatever action is deemed appropriate.
(2) Any applicant for a new permanent base or fixed station authorization to
be located on the islands of Puerto Rico, Desecheo, Mona, Vieques, and
Culebra, or for a modification of an existing authorization which would
change the frequency, power, antenna height, directivity, or location of a
station on these islands and would increase the likelihood of the authorized
facility causing interference, shall notify the Interference Office, Arecibo
Observatory, HC3 Box 53995, Arecibo, Puerto Rico 00612, in writing or
electronically, of the technical parameters of the proposal. Applicants may
wish to consult interference guidelines, which will be provided by Cornell
University. Applicants who choose to transmit information electronically
should e-mail to: prcz@naic.edu.
(i) The notification to the Interference Office, Arecibo Observatory shall
be made prior to, or simultaneously with, the filing of the application with
the Commission. The notification shall state the geographical coordinates of
the antenna (NAD–83 datum), antenna height above ground, ground elevation at
the antenna, antenna directivity and gain, proposed frequency and FCC Rule
Part, type of emission, and effective radiated power.
(ii) After receipt of such applications, the Commission will allow the
Arecibo Observatory a period of 20 days for comments or objections in
response to the notification indicated. The applicant will be required to
make reasonable efforts to resolve or mitigate any potential interference
problem with the Arecibo Observatory and to file either an amendment to the
application or a modification application, as appropriate. The Commission
shall determine whether an applicant has satisfied its responsibility to
make reasonable efforts to protect the Observatory from interference.
(b) Radio receiving installations. Protection for Table Mountain Radio
Receiving Zone, Boulder County, Colorado: Applicants for a station
authorization to operate in the vicinity of Boulder County, Colorado under
this Part are advised to give due consideration, prior to filing
applications, to the need to protect the Table Mountain Radio Receiving Zone
from harmful interference. These are the research laboratories of the
Department of Commerce, Boulder County, Colorado. To prevent degradation of
the present ambient radio signal level at the site, the Department of
Commerce seeks to ensure that the field strengths of any radiated signals
(excluding reflected signals) received on this 1800 acre site (within the
area bounded by 40 °09'10" N Latitude on the north, 105 °13'31" W Longitude on
the east, 40 °07'05" N Latitude on the south, and 105 °15'13" W Longitude on
the west) resulting from new assignments (other than mobile stations) or
from the modification of relocation of existing facilities do not exceed the
following values:
Frequency range Field strength in authorized bandwidth of service (mV/m)
Power flux density in authorized bandwidth of service (dBW/m^2) ^1
Below 540 kHz 10 −65.8
540 to 1700 kHz 20 −59.8
1.7 to 470 MHz 10 ^2−65.8
470 to 890 MHz 30 ^2−56.2
Above 890 MHz 1 ^2−85.8
^1 Equivalent values of power flux density are calculated assuming free
space characteristic impedance of 376.7=120 ohms.
^2 Space stations shall conform to the power flux density limits at the
earth's surface specified in appropriate parts of the FCC rules, but in no
case should exceed the above levels in any 4 kHz band for all angles of
arrival.
(1) Advance consultation is recommended particularly for those applicants
who have no reliable data which indicates whether the field strength or
power flux density figures in the above table would be exceeded by their
proposed radio facilities (except mobile stations). In such instances, the
following is a suggested guide for determining whether coordination is
recommended:
(i) All stations within 2.4 km (1.5 statute miles);
(ii) Stations within 4.8 km (3 statute miles) with 50 watts or more
effective radiated power (ERP) in the primary plane polarization in the
azimuthal direction of the Table Mountain Radio Receiving Zone;
(iii) Stations within 16 km (10 statute miles) with 1 kW or more ERP in the
primary plane of polarization in the azimuthal direction of Table Mountain
Receiving Zone;
(iv) Stations within 80 km (50 statute miles) with 25 kW or more ERP in the
primary plane polarization in the azimuthal direction of Table Mountain
Receiving Zone.
(2) Applicants concerned are urged to communicate with the Radio Frequency
Management Coordinator, Department of Commerce, Research Support Services,
NOAA R/E5X2, Boulder Laboratories, Boulder, CO 80303; telephone (303)
497–6548, in advance of filing their applications with the Commission.
(3) The Commission will not screen applications to determine whether advance
consultation has taken place. However, applicants are advised that such
consultation can avoid objectimns from the Department of Commerce or
proceedings to modify any authorization which may be granted which, in fact,
delivers a signal at the site in excess of the field strength specified
herein.
(c) Protection for Federal Communications Commission monitoring stations.
(1) Applicants in the vicinity of a FCC monitoring station for a radio
station authorization to operate new transmitting facilities or changed
transmitting facilities which would increase the field strength produced
over the monitoring station in excess of that previously authorized are
advised to give consideration, prior to filing applications, to the possible
need to protect the FCC stations from harmful interference. Geographical
coordinates of the facilities which require protection are listed in
Sec. 0.121(c) of the FCC rules. Applications for stations (except mobile
stations) which will produce on any frequency a direct wave fundamental
field strength of greater than 10 mV/m in the authorized bandwidth of
service (−65.8 dBW/m^2 power flux density assuming a free space
characteristic impedance of 120 π ohms) at the referenced coordinates, may
be examined to determine extent of possible interference. Depending on the
theoretical field strength value and existing root-sum-square or other
ambient radio field signal levels at the indicated coordinates, a clause
protecting the monitoring station may be added to the station authorization.
(2) In the event that calculated value of expected field exceeds 10 mV/m
(−65.8 dBW/m^2 ) at the reference coordinates, or if there is any question
whether field strength levels might exceed the threshold value, advance
consultation with the FCC to discuss any protection necessary should be
considered. Prospective applicants may communicate with: Chief, Compliance
and Information Bureau, Federal Communications Commission, Washington, DC
20554, Telephone (202) 632–6980.
(3) Advance consultation is suggested particularly for those applicants who
have no reliable data which indicates whether the field strength or power
flux density figure indicated would be exceeded by their proposed radio
facilities (except mobile stations). In such instances, the following is a
suggested guide for determining whether an applicant should coordinate:
(i) All stations within 2.4 kilometers (1.5 statute miles);
(ii) Stations within 4.8 kilometers (3 statute miles) with 50 watts or more
average effective radiated power (ERP) in the primary plane of polarization
in the azimuthal direction of the Monitoring Stations.
(iii) Stations within 16 kilometers (10 statute miles) with 1 kW or more
average ERP in the primary plane of polarization in the azimuthal direction
of the Monitoring Station;
(iv) Stations within 80 kilometers (50 statute miles) with 25 kW or more
average ERP in the primary plane of polarization in the azimuthal direction
of the Monitoring Station;
(4) Advance coordination for stations operating above 1000 MHz is
recommended only where the proposed station is in the vicinity of a
monitoring station designated as a satellite monitoring facility in
Sec. 0.121(c) of the Commission's Rules and also meets the criteria outlined in
paragraphs (b) (2) and (3) of this section.
(5) The Commission will not screen applications to determine whether advance
consultation has taken place. However, applicants are advised that such
consultation can avoid objections from the Federal Communications Commission
or modification of any authorization which will cause harmful interference.
[ 43 FR 32782 , July 28, 1978, as amended at 44 FR 77167 , Dec. 31, 1979; 47 FR 9221 , Mar. 4, 1982; 50 FR 39003 , Sept. 26, 1985; 52 FR 25867 , July 9, 1987;
52 FR 36879 , Oct. 1, 1987; 52 FR 37789 , Oct. 9, 1987; 56 FR 64872 , Dec. 12,
1991; 61 FR 8477 , Mar. 5, 1996; 62 FR 55532 , Oct. 27, 1997; 63 FR 70048 ,
Dec. 18, 1998; 70 FR 31373 , June 1, 2005]
Goto Section: 73.1020 | 73.1120
Goto Year: 2007 |
2009
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