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section, the developmental report of a station authorized for the development of a proposed radio service shall include comprehensive information on the following items:

(1) Probable public support and meth. ods of its determination.

(2) Practicability of service operations.

(3) Interference encountered.

(4) Pertinent information relative to merits of the proposed service.

(5) Propagation characteristics of frequencies used, particularly with respect to the service objective.

(6) Frequencies believed to be more suitable and reasons therefor.

(7) Type of signals or communications employed in the experimental work.

(c) Normally, developmental reports will be made a part of the Commission's public records. However, an applicant may request that the Commission withhold from the public certain reports and associated material relative to the accomplishments achieved under developmental authorization, and, if it appears that such information should be withheld, the Commission will so direct. Subpart G-Domestic Public Land

Mobile Radio Service $21.500 Eligibility,

Authorizations for base stations and auxiliary test stations to be operated in this service will be issued to existing and proposed communication common carriers. Authorizations for mobile stations on land or on board vessels will be issued to communication common carriers or to individual users of the service. Applications will be granted only in cases where It is shown that (a) the applicant is legally. financially, technically and otherwise qualified to render the proDused service, (b) there are frequencies available to enable the applicant to tender a satisfactory service, and (c) the public interest, convenience or necessity would be served by a grant thereof. $21.501 Frequencies.

The following frequencies are available to the Domestic Public Land Mobie Radio Service for the use set forth in this section.

(2) For assignment, in accordance with the Zone Allocation Plan, to stations of communication common carriers which are also in the business of affording public landline message telephone

service, for General and Dispatch Communications (provided that Signaling Communications may also be furnished by any facility rendering such General or Dispatch service). The frequencies specified may be used in adjoining zones within moderate distances of the respective zone boundaries to permit continuous service to mobile units transiting such zone boundaries.

Zone 1-Base station frequency: 35.66 Mc/s; Mobile and Auxiliary Test station frequency: 43.66 MC/8. Connecticut.

New York. Delaware.

Pennsylvania. District of Columbia. Rhode Island. Lake Ontario.

Vermont. Maine.

Virginia. Maryland.

West Virginia. Massachusetts.

New Hampshire. New Jersey.

Zone II—Base station frequency: 35.34 Mc/s; Mobile and Auxiliary Test station frequency: 43.34 Mc/8. Alabama.

Mississippi. Florida.

North Carolina. Georgia.

South Carolina. Louisiana.

Zone II—Base station frequency: 35.42 Mc/s; Mobile and Auxiliary Test station frequency: 43.42 MC/8. Illinois.

Lake St. Clair. Indiana.

Lake Superior. Kentucky.

Michigan. Lake Erie.

Ohio. Lake Huron.

Tennessee. Lake Michigan.

Wisconsin, Zone IV-Base station frequency: 35.54 Mc/s; Mobile and Auxiliary Test station frequency: 43.54 MC/8. Iowa.

North Dakota. Minnesota.

South Dakota. Montana.

Wyoming. Nebraska.

Zone V-Base station frequency: 35.30 Mc/s; Mobile and Auxiliary Test station frequency: 43.30 Mc/s. Arkansas.

Oklahoma. Kansas.

Texas. Missouri.

Zone VI–Base station frequency: 35.38 Mc/s; Mobile and Auxiliary Test station frequency: 43.38 MC/s. Arizona.

Nevada. California.

New Mexico. Colorado.

Utah. Zone VII-Base station frequency: 35.26 Mc/s; Mobile and Auxiliary Test station frequency: 43.26 MC/S. Idaho.

Washington. Oregon.

(c) For assignment to stations of communication common carriers not also engaged in the business of providing a public landline message telephone service for General and Dispatch Communications (provided that Signaling Communications may also be furnished by any facility rendering such General or Dispatch service): Base station

Mobile, dispatch, and frequencies auxiliary test station (Mc/3)

frequencies (MC/S) 152.03.

158. 49 152.06.

158. 52 152.09.

158. 55 152.12

158. 58 152.15.

158. 61 152.18.

158. 64 152.21.

158. 67 454.05.

459. 05 454.10.

459. 10 454.15

459. 15 454.20

459. 20 454.25

459. 25 454.30

459. 30 454.35


Zone VIII-Base station frequency: 35.50 Mc/s; Mobile and Auxiliary Test station frequency: 43.50 Mc/s. Indiana.

New York. Lake St. Clair.

Ohio. Michigan.

Pennsylvania. New Jersey.

The Great Lakes. Zone IX–Base station frequency: 35.62 Mc/s; Mobile and Auxiliary Test station frequency: 43.62 Mc/s. Arkansas.

Texas. Oklahoma.

Zone X-Base station frequency: 35.46 Mc/8; Mobile and Auxiliary Test station frequency: 43.46 MC/8. California.

Washington. Oregon.

(b) For assignment, to stations of communication common carriers engaged also in the business of affording public landline message telephone service, for General and Dispatch Communications (provided that

Signaling Communications may also be furnished by any facility rendering such General Dispatch Service):

Mobile, dispatch, and

auxiliary test staBase station fre

tion frequencies quencies (Mc/8)

(MC/8) 152.51.

157. 77 152.54.

157. 80 152.57.

157.83 152.60.

157.86 152.63

157. 89 152.66_

157.92 152.69

157.95 152.72..

157.98 152.75.

158. 01 152.78_

158.04 152.81

158.07 454.40.

459.40 454.45.

459. 45 454.50.

459. 50 454.55.

459. 55 454.60.

459. 60 454.65

459. 65 454.701

1459. 70 454.75 1

1459. 75 454.80 1

1459. 80 454.85 1

1459.85 454.901

1459.90 454.95 1

1459.95 * Pending promulgation of rules and regulations to govern the public air-ground radiotelephone service, and subject to further Order of the Commission, frequencies in the 454.675–455.000 Mc/8 and 459.675-460.000 MC/8 bands are not available for operation of new radio facilities in the Domestic Public Land Mobile Radio Service. In the interim, the authorizations of stations using such frequencies may be renewed, subject to Commission determination relative to use of such frequencies by the public air-ground radiotelephone service.

(d) For assignment, to base stations of communication common carriers for use exclusively in providing a one-way signaling service to mobile receivers: 35.22 MC/8

43.22 Mc/s 35.58 Mc/s

43.58 Mc/s (1) Wherever feasible, the frequencies 35.22 Mc/s and 35.58 MC/s shall be assigned for use in any area prior to the assignment of the frequencies 43.22 Mc/s and 43.58 MC/S.

(2) If an applicant for authoriza'ion to provide an exclusive one-way signaling service provides, or proposes also to provide, General or Dispatch service in accordance with paragraphs (a), (b) and (c) of this section, the application for a one-way facility should be supported with full information to show why the proposed signaling service could not be provided in connection with the base station facilities used for such General or Dispatch service.

(e) On a shared basis with other common carrier fixed, international control and operational fixed radio services, frequencies in the band 2110-2200 Mc/s may be authorized for use by control and repeater stations functioning in conjunction with the Domestic Public Land Mobile Radio Service on the condition that the emission bandwidth is limited to the minimum necessary to serve the purpose

required. Bandwidths in excess of 5 the 890–942 Mc/s band or by ISM equipMc/s will not be authorized.

ment operating on 915 Mc/s. (f) The frequencies listed in this para- (2) That an engineering study by the graph are available for assignment to Commission indicates that the proposed control and repeater stations functioning frequency assignment in the band 942– in conjunction with the Domestic Public 952 Mc/s is likely to eliminate the interLand Mobile Radio Service, on a shared ference. basis with certain other radio services. (3) That the bandwidth of emission A repeater station normally will not be does not exceed 1100 kc/s. authorized unless the land mobile ra- (4) That the proposed frequency dio system with which it is associated

assignment will not cause interference to is continuously open for public corre

existing operations in the band 942–952 spondence and the emission of the re

Mc/s. peater station are under the operational

(i) In lieu of a wireline circuit for consurveillance of the land mobile system's

trol of a specific base station transmitter operating personnel.

from its required control point or in lieu 72-76 Mc/s Band 1

of wirelines for an audio circuit to a MC/S MC/3 MC/S

base station control point from a re

Mc/8 72.02 72.42 72.82 75.62 motely located fixed receiver used for 72.06 72.46 72.86

75.66 reception of mobile station transmis72.10 72.50 72.90

75.70 sions, and upon an affirmative showing 72.14 72.54 72.94

75.74 that the conditions set forth in subpara72.18 72.68 72.98 75.78

graphs (1) through (5) of this para72.22 72.62 76.42


graph are satisfied, a single control and 72.26 72.66 75.46 76.86 72.30 72.70 76.50


repeater station may be authorized to 72.34 72.74 75.54 75.94

miscellaneous common carriers upon the 72.38

72.78 75.58 75.98 frequencies indicated below: 1 Assignments made to stations on frequen- Control station Repeater station cies in this band are subject to the condi- frequencies (Mc/s) frequencies (MC/S) tion that no harmful interference will be


459.05 caused to operational fixed stations or re


459.10 ception of television stations on channels


459.15 4 or 5. (See $21.103.) Existing stations


459.20 authorized in the 73 to 74.6 Mc/s band as


459.25 of December 1, 1961, may continue to operate


459.30 and shall not be required to afford protec


459.35 tion to the radio astronomy service.

(1) The control station, and the base (g) New control and repeater stations

station controlled thereby, are located will not be authorized in the 890–940

over 50 airline miles from the nearest Mc's band. However, stations which

geographical boundary of the nearest were authorized to operate on such fre

urbanized area having a population over quencies on April 16, 1958, may be grant

300,000 (as determined and defined in ed renewed licenses subject to the fol

the most recent census reports of the lowing conditions:

U.S. Bureau of the Census). (1) Operations shall not be protected

(2) The repeater station, and the against any interference received from

point to which its transmissions are dithe emission of industrial, scientific, and

rected, are located over 50 airline miles medical equipment operating on 915

from the nearest geographical boundary Mc s or from the emission of radioloca

of the nearest urbanized area having a tion stations in the 890–942 Mc/s band.

population over 300,000 (as determined (2) No harmful interference shall be

and defined in the most recent census caused to stations operating in the radio

reports of the U.S. Bureau of the location service in the 890-942 MC/S

Census). band.

(3) The effective radiated power of the (h) Stations now authorized in the

control or repeater station does not exband 890-940 Mc/s may be authorized to ceed 150 watts. operate in the band 942–952 Mc/s on the (4) The use of the frequencies by a following conditions:

control or repeater station will not cause (1) That such stations can show that harmful interference to any other staharmful interference is being caused by tion authorized to use such frequencies Government radiopositioning stations in and shall be on a secondary basis to the


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provision of mobile and rural radio service by other classes of stations.

(5) Series operation of more than one control or repeater station is not involved.

NOTE: The provisions of subparagraphs (1) and (2) of this paragraph may be waived by the Commission upon a factual showing, supported by such engineering proof as may be necessary, that all of the currently assignable pairs of 152–162 MC/8 band frequencles listed in paragraph (c) of this section are not assigned or applied for within interference range of existing or possible station assignments within the urbanized area having a population of over 300,000 and, upon a satisfactory showing, that in such area over a substantial period of years the growth of the public land mobile radio seryice has not been hampered and is not likely to be hampered by a shortage of frequencies allocated to such service in the 152 to 162 Mc/8 band. Facilities authorized under the provisions of such waivers shall be on a secondary basis and subject to the condition that, in the event the frequencies are required for assignment to base and mobile stations in the area, operation thereon shall be terminated within 60 days after notice 18 received from the Commission. [28 F.R. 13002, Dec. 5, 1963, as amended at 29 F.R. 2700, Feb. 26, 1964) 8 21.502 Classification of base stations.

Base stations of miscellaneous common carriers in the Domestic Public Land Mobile Radio Service shall be classified, as set forth below, according to their transmitting antenna height above average terrain, and according to their effective radiated power in the horizontal plane of the antenna.

In any particular case, where it appears that unusual radio wave propagation conditions are involved, the Commission may require greater separation than indicated in the above table, or make assignments at lesser station spacing. Reference may be made to $ 73.611(d) of this chapter, Radio Broadcast Services, for methods of computing milage separation between station locations. § 21.504 Service area of base station.

(a) The limits of reliable service area of a base station are considered to be described by a field strength contour of 37 decibels above one microvolt per meter for stations engaged in two-way communication service with mobile stations and 43 decibels above one microvolt per meter for stations engaged in one-way signaling service. Service within that area is generally expected to have an average reliability of not less than 90 percent.

(b) The field strength contours described in paragraph (a) of this section shall be regarded as determining the limits of the reliable service area of the related base stations for the purpose of providing protection to such stations from co-channel electrical harmful interference and defining the area within which consideration will be accorded claims of economic competitive injury. 8 21.505 Antenna height-power limit

for base stations. In view of the fact that the predominant need for mobile communication service can usually be met by base stations within the classification set forth in § 21.502, and because widespread coverage is undesirable in areas where no substantial need exists for mobile communication service through a distant

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base station, base stations will not be $ 21.507 Bandwidth and emission limi. authorized to employ transmitting an- tations. tennas in excess of 500 feet above av

(a) Stations in the Domestic Public erage terrain unless the effective radi, Land Mobile Radio Service shall ated power of the base station is reduced

normally be authorized to use only type below 500 watts by not less than the

A3 or F3 emission for radiotelephony, amount shown in the following chart

and type A1, A2, F1, or F2 emission for entitled “Required Reduction in Effective

selective signaling. The authorization to Radiated Power for Antenna Heights in

use type A3 or F3 emission for radioExcess of 500 Feet Above Average Ter

telephony shall be construed to include the use of tone signals or signaling de

vices the sole function of which is to $21.506 Power limitations.

establish and maintain communication. Stations in this service shall not be Stations providing one-way signaling permitted to exceed 500 watts effective service by means of selective signaling radiated power and shall not be author- which is not associated with a voice ized to use transmitters having a rated message are required to be authorized to

employ telegraph type emission appropower output in excess of the limits set

priate to the type of transmission emforth in $ 21.107(b): Provided, however,

ployed. The use of types A0 or FO That the effective radiated power of dis

emission in the 72-76 Mc/s band will not patch stations shall not be permitted to

be authorized, except for temporary or exceed 100 watts. A base station standby

short periods necessary for testing incitransmitter having a rated power output

dent to the construction or maintenance in excess of that of the main transmitter of a radio station. (Further reference of the base station with which it is should be made to $ $ 21.103 to 21.105, associated will not be authorized.


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