Sec. 1.924  Quiet zones.

    Areas implicated by this paragraph are those in which it is 
necessary to restrict radiation so as to minimize possible impact on the 
operations of radio astronomy or other facilities that are highly 
sensitive to interference. Consent throughout this paragraph means 
written consent from the quiet zone, radio astronomy, research, and 
receiving installation entity. The areas involved and procedures 
required are as follows:
    (a) NRAO, NRRO. The requirements of this paragraph are intended to 
minimize possible interference at the National Radio Astronomy 
Observatory site located at Green Bank, Pocahontas County, West 
Virginia, and at the Naval Radio Research Observatory site at Sugar 
Grove, Pendleton County, West Virginia.
    (1) Applicants and licensees planning to construct and operate a new 
or modified station at a permanent fixed location within the area 
bounded by N 39[deg]15[min]0.4[sec] on the north, W 
78[deg]29[min]59.0[sec] on the east, N 37[deg]30[min]0.4[sec] on the 
south, and W 80[deg]29[min]59.2[sec] on the west must notify the 
Director, National Radio Astronomy Observatory, Post Office Box No. 2, 
Green Bank, West Virginia 24944, in writing, of the technical details of 
the proposed operation. The notification must include the geographical 
coordinates of the antenna location, the antenna height, antenna 
directivity (if any), the channel, the emission type and power.
    (2) When an application for authority to operate a station is filed 
with the FCC, the notification required in paragraph (a)(1) of this 
section may be made prior to, or simultaneously with the application. 
The application must state the date that notification in accordance with 
paragraph (a)(1) of this section was made. 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 applicant 
submits written consent from the National Radio Astronomy Observatory 
for itself or on behalf of the Naval Radio Research Observatory, the FCC 
will process the application without awaiting the conclusion of the 20-
day period. For services that do not require individual station 
authorization, entities that have obtained written consent from the 
National Radio Astronomy Observatory for itself or on behalf of the 
Naval Radio Research Observatory may begin to operate new or modified 
facilities prior to the end of the 20-day period. In instances in which 
notification has

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been made to the National Radio Astronomy Observatory prior to 
application filing, the applicant must also provide notice to the quiet 
zone entity upon actual filing of the application with the FCC. Such 
notice will be made simultaneous with the filing of the application and 
shall comply with the requirements of paragraph (a)(1) of this section.
    (3) If an objection 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, after consideration of 
the record, take whatever action is deemed appropriate.
    (b) Table Mountain. The requirements of this paragraph are intended 
to minimize possible interference at the Table Mountain Radio Receiving 
Zone of the Research Laboratories of the Department of Commerce located 
in Boulder County, Colorado.
    (1) Licensees and applicants planning to construct and operate a new 
or modified station at a permanent fixed location in the vicinity of 
Boulder County, Colorado are advised to give consideration, prior to 
filing applications, to the need to protect the Table Mountain Radio 
Receiving Zone from interference. 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 (in the vicinity of 
coordinates 40[deg]07[min]49.9[sec] North Latitude, 
105[deg]14[min]42.0[sec] West Longitude) resulting from new assignments 
(other than mobile stations) or from the modification or relocation of 
existing facilities do not exceed the values given in the following 
table:

              Field Strength Limits for Table Mountain \1\
------------------------------------------------------------------------
                                                                 Power
                                                      Field       flux
                  Frequency range                    strength   density
                                                      (mV/m)     (dBW/m
                                                                  \2\)
------------------------------------------------------------------------
Below 540 kHz.....................................         10      -65.8
540 to 1600 kHz...................................         20      -59.8
1.6 to 470 MHz....................................         10      -65.8
470 to 890 MHz....................................         30      -56.2
890 MHz and above.................................          1     -85.8
------------------------------------------------------------------------
\1\ Note: Equivalent values of power flux density are calculated
  assuming free space characteristic impedance of 376.7[Omega]
  (120[pi][Omega]).

    (2) Advance consultation is recommended, particularly for applicants 
that have no reliable data to indicate whether the field strength or 
power flux density figures in the above table would be exceeded by their 
proposed radio facilities. In general, coordination is recommended for:
    (i) Stations located within 2.4 kilometers (1.5 miles) of the Table 
Mountain Radio Receiving Zone;
    (ii) Stations located within 4.8 kilometers (3 miles) transmitting 
with 50 watts or more effective radiated power (ERP) in the primary 
plane of polarization in the azimuthal direction of the Table Mountain 
Radio Receiving Zone;
    (iii) Stations located with 16 kilometers (10 miles) transmitting 
with 1 kW or more ERP in the primary plane of polarization in the 
azimuthal direction of Table Mountain Radio Receiving Zone;
    (iv) Stations located within 80 kilometers (50 miles) transmitting 
with 25 kW or more ERP in the primary plane of polarization in the 
azimuthal direction of Table Mountain Receiving Zone.
    (3) Applicants concerned are urged to communicate with the Radio 
Frequency Management Coordinator, Department of Commerce, NOAA R/OM62, 
325 Broadway, Boulder, CO 80305; telephone 303-497-6548, in advance of 
filing their applications with the Commission.
    (4) The FCC will not screen applications to determine whether 
advance consultation has taken place. However, such consultation may 
avoid the filing of objections from the Department of Commerce or 
institution of proceedings to modify the authorizations of stations that 
radiate signals with a field strength or power flux density at the site 
in excess of those specified herein.
    (c) Federal Communications Commission protected field offices. The 
requirements of this paragraph are intended to minimize possible 
interference to FCC monitoring activities.
    (1) Licensees and applicants planning to construct and operate a new 
or modified station at a permanent fixed location in the vicinity of an 
FCC protected field office are advised to give

[[Page 225]]

consideration, prior to filing applications, to the need to avoid 
interfering with the monitoring activities of that office. FCC protected 
field offices are listed in Sec. 0.121 of this chapter.
    (2) Applications for stations (except mobile stations) that could 
produce on any channel a direct wave fundamental field strength of 
greater than 10 mV/m (-65.8 dBW/m\2\ power flux density assuming a free 
space characteristic impedance of 120[pi] [Omega]) in the authorized 
bandwidth at the protected field office may be examined to determine the 
potential for interference with monitoring activities. After 
consideration of the effects of the predicted field strength of the 
proposed station, including the cumulative effects of the signal from 
the proposed station with other ambient radio field strength levels at 
the protected field office, the FCC may add a condition restricting 
radiation toward the protected field office to the station 
authorization.
    (3) In the event that the calculated field strength exceeds 10 mV/m 
at the protected field office site, or if there is any question whether 
field strength levels might exceed that level, advance consultation with 
the FCC to discuss possible measures to avoid interference to monitoring 
activities should be considered. Prospective applicants may communicate 
with: Chief, Enforcement Bureau, Federal Communications Commission, 
Washington, DC 20554.
    (4) Advance consultation is recommended for applicants that have no 
reliable data to indicate whether the field strength or power flux 
density figure indicated would be exceeded by their proposed radio 
facilities. In general, coordination is recommended for:
    (i) Stations located within 2.4 kilometers (1.5 miles) of the 
protected field office;
    (ii) Stations located within 4.8 kilometers (3 miles) with 50 watts 
or more average effective radiated power (ERP) in the primary plane of 
polarization in the azimuthal direction of the protected field offices.
    (iii) Stations located within 16 kilometers (10 miles) with 1 kw or 
more average ERP in the primary plane of polarization in the azimuthal 
direction of the protected field office;
    (iv) Stations located within 80 kilometers (50 miles) with 25 kw or 
more average ERP in the primary plane of polarization in the azimuthal 
direction of the protected field office;
    (v) Advance coordination for stations transmitting on channels above 
1000 MHz is recommended only if the proposed station is in the vicinity 
of a protected field office designated as a satellite monitoring 
facility in Sec. 0.121 of this chapter.
    (vi) The FCC will not screen applications to determine whether 
advance consultation has taken place. However, such consultation may 
serve to avoid the need for later modification of the authorizations of 
stations that interfere with monitoring activities at protected field 
offices.
    (d) Notification to the Arecibo Observatory. The requirements in 
this section are intended to minimize possible interference at the 
Arecibo Observatory in Puerto Rico. Licensees must make reasonable 
efforts to protect the Observatory from interference. Licensees planning 
to construct and operate a new station at a permanent fixed location on 
the islands of Puerto Rico, Desecheo, Mona, Vieques or Culebra in 
services in which individual station licenses are issued by the FCC; 
planning to construct and operate a new station at a permanent fixed 
location on these islands that may cause interference to the operations 
of the Arecibo Observatory in services in which individual station 
licenses are not issued by the FCC; or planning a modification of any 
existing station at a permanent fixed location on these islands that 
would increase the likelihood of causing interference to the operations 
of the Arecibo Observatory must notify the Interference Office, Arecibo 
Observatory, Post Office Box 995, Arecibo, Puerto Rico 00613, in writing 
or electronically (e-mail address: prcz@naic.edu), of the technical 
parameters of the planned operation. Carriers may wish to use the 
interference guidelines provided by Cornell University as guidance in 
designing facilities to avoid interference to the Observatory. The 
notification must include identification of the geographical coordinates 
of the antenna location (NAD-83 datum), the antenna height, antenna 
directivity (if any),

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proposed channel and FCC Rule Part, type of emission, and effective 
isotropic radiated power.
    (1) In the Amateur radio service:
    (i) The provisions of paragraph (d) of this section do not apply to 
repeaters that transmit on the 1.2 cm or shorter wavelength bands; and
    (ii) The coordination provision of paragraph (d) of this section 
does not apply to repeaters that are located 16 km or more from the 
Arecibo observatory.
    (2) In services in which individual station licenses are issued by 
the FCC, the notification required in paragraph (d) of this section may 
be made prior to, or simultaneously with, the filing of the application 
with the FCC, and at least 20 days in advance of the applicant's planned 
operation. The application must state the date that notification in 
accordance with paragraph (d) of this section was made. In services in 
which individual station licenses are not issued by the FCC, the 
notification required in paragraph (d) of this section should be sent at 
least 45 days in advance of the applicant's planned operation. In the 
latter services, the Interference Office must inform the FCC of a 
notification by an applicant within 20 days if the Office plans to file 
comments or objections to the notification. After the FCC receives an 
application from a service applicant or is informed by the Interference 
Office of a notification from a service applicant, the FCC will allow 
the Interference Office a period of 20 days for comments or objections 
in response to the application or notification. If an applicant submits 
written consent from the Interference Office, the FCC will process the 
application without awaiting the conclusion of the 20-day period. For 
services that do not require individual station authorization, entities 
that have obtained written consent from the Interference Office may 
begin to operate new or modified facilities prior to the end of the 20-
day period. In instances in which notification has been made to the 
Interference Office prior to application filing, the applicant must also 
provide notice to the Interference Office upon actual filing of the 
application with the FCC. Such notice will be made simultaneous with the 
filing of the application and shall comply with the requirements of 
paragraph (d) of this section.
    (3) If an objection to any planned service operation is received 
during the 20-day period from the Interference Office, the FCC will take 
whatever action is deemed appropriate.
    (4) The provisions of paragraph (d) of this section do not apply to 
operations that transmit on frequencies above 15 GHz.
    (e) Government satellite earth stations. (1) To minimize or avoid 
harmful interference to Government Satellite Earth Stations located in 
the Denver, Colorado and Washington, DC areas, any application for a new 
station license to operate in the 17.8-19.7 GHz band (except for low 
power operations governed by Sec. 101.147(r)(10) of this chapter), or 
for modification of an existing station license in this band which would 
change the frequency, power, emission, modulation, polarization, antenna 
height or directivity, or location of such a station, must be 
coordinated with the Federal Government by the Commission before an 
authorization will be issued, if the station or proposed station is 
located in whole or in part within any of the areas defined by the 
following rectangles or circles:

                             Denver, CO Area

Rectangle 1:
    41[deg]30[min]00[sec] N. Lat. on the north
    103[deg]10[min]00[sec] W. Long. on the east
    38[deg]30[min]00[sec] N. Lat. on the south
    106[deg]30[min]00[sec] W. Long. on the west
Rectangle 2:
    38[deg]30[min]00[sec] N. Lat. on the north
    105[deg]00[min]00[sec] W. Long. on the east
    37[deg]30[min]00[sec] N. Lat. on the south
    105[deg]50[min]00[sec] W. Long. on the west
Rectangle 3:
    40[deg]08[min]00[sec] N. Lat. on the north
    107[deg]00[min]00[sec] W. Long. on the east
    39[deg]56[min]00[sec] N. Lat. on the south
    07[deg]15[min]00[sec] W. Long. on the west

                           Washington, DC Area

Rectangle
    38[deg]40[min]00[sec] N. Lat. on the north
    78[deg]50[min]00[sec] W. Long. on the east
    38[deg]10[min]00[sec] N. Lat. on the south
    79[deg]20[min]00[sec] W. Long. on the west; or

    (2) Within a radius of 178 km of 38[deg]48[min]00[sec] N. Lat./
76[deg]52[min]00[sec] W. Long.
    (3) In addition, no application seeking authority to operate in the 
17.8-19.7

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GHz band will be accepted for filing if the proposed station is located 
within 20 km (or within 55 km if the application is for an outdoor low 
power operation pursuant to Sec. 101.147(r)(10) of this chapter) of the 
following coordinated:

Denver, CO area: 39[deg]43[min]00[sec] N. Lat./104[deg]46[min]00[sec] W. 
          Long.
Washington, DC area: 38[deg]48[min]00[sec] N. Lat./76[deg]52[min]00[sec] 
          W. Long.

    (f) 420-450 MHz band. (1) In the band 420-450 MHz, applicants should 
not expect to be accommodated if their area of service is within 160 
kilometers (100 miles) of the following locations:
    (i) 41[deg]45[min]00.2[sec] N, 70[deg]30[min]58.3[sec] W.,
    (ii) 64[deg]17[min]00.0[sec] N., 149[deg]10[min]00.0[sec] W.,

    Note to: Paragraph(f)(ii) is referenced to NAD27.

    (iii) 48[deg]43[min]00.0[sec] N., 97[deg]54[min]01.4[sec] W.;
    (2) Within 200 kilometers (124 miles) of the following locations:
    (i) 32[deg]38[min]00.5[sec] N., 83[deg]34[min]59.7[sec] W.,
    (ii) 31[deg]25[min]00.6[sec] N., 100[deg]24[min]01.3[sec] W.;
    (3) Within 240 kilometers (150 miles) of the following location:
    (i) 39[deg]07[min]59.6[sec] N., 121[deg]26[min]03.9[sec] W.;
    (ii) [Reserved]
    (4) Within 320 kilometers (200 miles) of the following locations:
    (i) 28[deg]21[min]01.0[sec] N., 80[deg]42[min]59.2[sec] W.,
    (ii) 30[deg]30[min]00.7[sec] N., 86[deg]29[min]59.8[sec] W.,
    (iii) 34[deg]08[min]59.6[sec] N, 119[deg]11[min]03.8[sec] W;
    (5) Or in the following locations:
    (i) The state of Arizona,
    (ii) The state of Florida,
    (iii) Portions of California and Nevada south of 37[deg]10[min] N.,
    (iv) And portions of Texas and New Mexico bounded by 31[deg]45[min] 
N., 34[deg]30[min] N., 104[deg]00[min] W., and 107[deg]30[min] W.
    (g) GOES. The requirements of this paragraph are intended to 
minimize harmful interference to Geostationary Operational Environmental 
Satellite earth stations receiving in the band 1670-1675 MHz, which are 
located at Wallops Island, Virginia; Fairbanks, Alaska; and Greenbelt, 
Maryland.
    (1) Applicants and licensees planning to construct and operate a new 
or modified station within the area bounded by a circle with a radius of 
100 kilometers (62.1 miles) that is centered on 37E56[min]47[sec] N, 
75E27[min]37[sec] W (Wallops Island) or 64E58[min]36[sec] N, 
147E31[min]03[sec] W (Fairbanks) or within the area bounded by a circle 
with a radius of 65 kilometers (40.4 miles) that is centered on 
39E00[min]02[sec] N, 76E50[min]31[sec] W (Greenbelt) must notify the 
National Oceanic and Atmospheric Administration (NOAA) of the proposed 
operation. For this purpose, NOAA maintains the GOES coordination web 
page at http://www.osd.noaa.gov/radio/frequency.htm, which provides the 
technical parameters of the earth stations and the point-of-contact for 
the notification. The notification shall include the following 
information: requested frequency, geographical coordinates of the 
antenna location, antenna height above mean sea level, antenna 
directivity, emission type, equivalent isotropically radiated power, 
antenna make and model, and transmitter make and model.
    (2) Protection. (i) Wallops Island and Fairbanks. Licensees are 
required to protect the Wallops Island and Fairbanks sites at all times.
    (ii) Greenbelt. Licensees are required to protect the Greenbelt site 
only when it is active. Licensees should coordinate appropriate 
procedures directly with NOAA for receiving notification of times when 
this site is active.
    (3) When an application for authority to operate a station is filed 
with the FCC, the notification required in paragraph (f)(1) of this 
section should be sent at the same time. The application must state the 
date that notification in accordance with paragraph (f)(1) of this 
section was made. After receipt of such an application, the FCC will 
allow a period of 20 days for comments or objections in response to the 
notification.
    (4) If an objection is received during the 20-day period from NOAA, 
the FCC will, after consideration of the record, take whatever action is 
deemed appropriate.

    Note to Sec. 1.924: Unless otherwise noted, all coordinates cited 
in this section are specified in terms of the North American Datum of 
1983 (NAD ).

[63 83 FR 68924 , Dec. 14, 1998, as amended at  67 FR 6182 , Feb. 11, 2002;  67 FR 13224 , Mar. 21, 2002;  67 FR 41852 , June 20, 2002;  67 FR 71111 , Nov. 
29, 2002;  69 FR 17957 , Apr. 6, 2004]