Sec. 5.67  Policy governing the assignment of frequencies.

    (a) Each frequency or band of frequencies, available for assignment 
to stations in the Experimental Radio Service is available on a shared 
basis only, and will not be assigned for the exclusive use of any one 
applicant, and such use may also be restricted to one or more specified 
geographical areas. Normally not more than one frequency in a band of 
frequencies will be assigned for the use of a single applicant unless a 
showing is made demonstrating that need for the assignment of additional 
frequencies is essential to the proposed program of experimentation.
    (b) Frequency assignments will be made only on the condition that 
harmful interference will not be caused to any station operating in 
accordance with the Table of Frequency Allocation of part 2 of this 
chapter.
    (c) The frequencies available for use in the Experimental Radio 
Service are set forth in Sec. 5.203.
    (d) Protection for Federal Communications Commission monitoring 
stations:
    (1) Applicants in the vicinity of an 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 over that previously authorized are 
advised to give consideration, prior to filing applications, to the 
possible need to protect

[[Page 576]]

the FCC stations from harmful interference. Geographical coordinates of 
the facilities which require protection are listed in Sec. 0.121(c) of 
the Commission's 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/m2 power flux density assuming a free 
space characteristic impedance of 120 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/m2) 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, D.C. 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 (d) (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.
[ 28 FR 12506 , Nov. 22, 1963, as amended at  44 FR 77176 , Dec. 31, 1979; 
 48 FR 52737 , Nov. 22, 1983;  61 FR 8477 , Mar. 5, 1996]