terference is not caused to the Government radiolocation service.

US58 In the band 10,000-10,500 Mc/s, pulsed emissions are prohibited, except for weather radars on board meteorological satellites in the band 10,000-10,025 Mc/s. The amateur service and the non-Government radiolocation service, which shall not cause harmful interference to the Government radiolocation service, are the only non-Government services permitted in this band. The non-Government radiolocation service is limited to survey operations using transmitters with a power not to exceed one watt into the antenna.

US59 The band 10,500-10,550 Mc/s is restricted to systems using type AO emission with a power not to exceed 40 watts into the antenna.

US60 The use of this band by non-Government services is limited to the space (telecommand) service.

US61 The use of this band by non-Government services is limited to the amateur service.

US62 The use of this band by Government services is limited to the space research service.

US65 The use of the band 5460-5650 Mc/s by the maritime radionavigation service is limited to shipborne radars.

US66 The use of the band 9300-9500 Mc/s by the aeronautical radionavigation service is limited to airborne radars and associated airborne beacons.

US67 The use of the band 9300-9500 Mc/s by the meteorological aids service is limited to ground-based radars. Radiolocation installations will be coordinated with the meteorological alds service and, insofar as practicable, will be adjusted to meet the requirements of the meteorological aids service.

US68 The non-Government use of this band is limited to the radio astronomy service.

US69 In the band 31.8-33.4 Gc/s, groundbased radionavigation aids are not permitted except where they operate in co-operation with airborne or shipborne radionavigation devices.

US70 The meteorological aids service allocation in the band 400.05-406 Mc/s does not preclude the operation therein of asBociated ground transmitters.

CS71 In the band 9300-9320 Mc/s, lowpowered maritime radionavigation stations shall be protected from harmful interference caused by the operation of land-based equ'pment.

C872 In the band 24.25-25.25 Gc/s, Govrent radiolocation devices (ASDE) are permitted between 24.25-24.47 Gc/s on a shared basis.

US74 The radio astronomy service shall be protected from extra-band radiation only to the extent that such radiation exceeds the level which would be present if the offending station were operating in comPlance with the technical standards or

criteria applicable to the service in which it operates.

US77 The frequencies 156.6 and 156.7 Mc/s for use on a simplex basis and the frequency pair 157.0/161.6 Mc/s for ship and coast stations, respectively, for use on duplex basis, may also be authorized to Government stations in the maritime mobile service for port operations only.

US78 In the band 1435-1525 Mc/s, the frequencies between 1435 and 1485 Mc/s will be assigned primarily for the flight testing of manned aircraft, or major components thereof; the frequencies between 1485 and 1525 Mc/s will be assigned primarily for the flight testing of unmanned aircraft and missiles or major components thereof. Included as permissible usage for aeronautical telemetering stations in the band 14351525 Mc/s is telemetry associated with launching and re-entry into the earth's atmosphere, as well as any incidental orbiting prior to re-entry, of manned or unmanned objects undergoing flight tests.

US80 Government stations may use the frequency 122.9 Mc/s subject to the following conditions:

(a) All operation by Government stations shall be restricted to the purpose for which the frequency is authorized to non-Government stations, and shall be in accordance with the appropriate provisions of the Commission's rules and regulations, Part 9, Aviation Services;

(b) Use of the frequency is required for coordination of activities with Commission licensees operating on this frequency; and (c) Government stations will not be authorized for operation at fixed locations.

US81 The band 38-38.16 Mc/s may be used by both Government and non-Government radio astronomy observatories. No new assignments are to be made and Government stations in the band 38-38.16 Mc/s will be moved to other bands on a case-bycase basis, as required, to protect radio astronomy observations from harmful interference. As an exception, however, lowpowered military transportable and mobile stations used for tactical and training purposes will continue to use the band. To the extent practicable, the latter operations will be adjusted to relieve such interference as may be caused to radio astronomy observations. In the event of harmful interference from such local operations, radio astronomy observatories may contact local military commands directly, with a view to effecting relief. A list of military commands, areas of coordination, and points of contact for purposes of relieving interference may be obtained upon request from the Office of Chief Engineer, Federal Communications Commission, Washington, D.C., 20554.

US82 The assignable frequencies in this band may be authorized on a shared nonpriority basis to Government and non-Government ship and coast stations (SSB telephony, with peak envelope power not to exceed 1 kw) on the condition that harmful

interference shall not be caused by the coast stations to service rendered by ship stations of other administrations operating in this band in accordance with Appendix 15 to the Radio Regulations.

US83 Non-Government use of this band is limited to the following: 9995-10003 kc/s, radio astronomy service; 10003-10005 kc/s, radio astronomy and space research services.

US84 The non-Government use of this band is limited to the space research service.

US85 In the bands 117.975-123.075 and 123.575-136 Mc/s, the use and development, for the aeronautical mobile (R) service, of systems using space communication techniques may be authorized but limited initially to satellite relay stations of the aeronautical mobile (R) service.

US86 The frequencies 148.25 Mc/s ±15 kc/s and 154.2±15 kc/s may be used by Government and non-Government stations for space telecommand at specific locations, subject to such conditions as may be imposed on a case-by-case basis. With respect to 154.2 Mc/s, the commands are to be limited to short duration of the order of three seconds ("Address and execute" commands). Further, on a case-by-case basis and solely to avoid harmful interference to non-Government stations in the land mobile service, a comparable replacement frequency assignment will be made available below 150.8 Mc/s, if required.

US87 The frequency 450 Mc/s, with maximum emission bandwidth of 500 kc/s, may be used by Government and non-Government stations for space telecommand at specific locations, subject to such conditions as may be applied on a case-by-case basis.

US88 Stations in the broadcasting service will not be authorized in the band 608-614 Mc/s prior to January 1, 1974. In the interim the band is available for use by the radio astronomy service. The radio astronomy service shall be protected from extraband radiation only to the extent that such radiation exceeds the level which would be present if the offending station were operating in compliance with the technical standards or criteria applicable to the service in which it operates.

US89 The aeronautical telemetering frequencies in the band 1525-1535 Mc/s will be assigned primarily for the flight testing of unmanned aircraft and missiles or major components thereof. Included as permissible usage for aeronautical telemetering stations in the band 1525-1535 Mc/s is telemetry associated with launching and entry into the earth's atmosphere, as well as any incidental orbiting prior to re-entry, of manned or unmanned objects undergoing flight tests.

re

US90 The band 2110-2120 Mc/s may be used by Government and non-Government stations for space telecommand at specific locations in conjunction with spacecraft engaged in deep space research, subject to such conditions as may be applied on a case-bycase basis.

-US91 The ultimate disposition of this band in the communication-satellite service, as between Government and non-Government, is deferred. In the meanwhile the non-Government may exploit the 4 and 6 Gc/s bands and the Government may exploit the 7 and 8 Gc/s bands for communication-satellite service systems intended to become operational. Any modification of this policy will be discussed and agreed in the FCC/DTM (IRAC) mechanism prior to the filing of applications with the IRAC for frequency assignments which are not in accordance with the foregoing.

US92 In the band 7300-7750 Mc/s, the meteorological-satellite service may use a band up to 100 Mc/s in width. This 100 Mc/s band may also be used for the transmission of tracking and telemetering signals associated with meteorological-satellite space stations operating in the same band.

US93 In the conterminous United States, the frequency 108.0 Mc/s may be authorized for use by VOR test facilities, the operation of which is not essential for the safety of life or property, subject to the condition that no interference is caused to the reception of FM broadcasting stations operating in the band 88-108 Mc/s. In the event that such interference does occur, the licensee or other agency authorized to operate the facility shall discontinue operation on 108 Mc/s and shall not resume operation until the interference has been eliminated or the complaint otherwise satisfied. VOR test facilities operating on 108 Mc/s will not be protected against interference caused by FM broadcasting stations operating in the band 88-108 Mc/s nor shall the authorization of a VOR test facility on 108 Mc/s preclude the Commission from authorizing additional FM broadcasting stations.

US94 The bands 30.005-30.015 Mc/s and 39.986-40.02 Mc/s are also allocated, on a secondary basis, to the space research service for space station-to-earth station transmissions only.

US95 The band 66-72 Mc/s is not available for television broadcasting at Guam, Mariana Islands. Subject to agreement by the Commission, frequencies within this band may be authorized until July 1, 1970, for use by Government stations in the maritime mobile service in the Mariana Islands and vicinity.

US96 In the band 1990-2110 Mc/s, the frequencies 2106.4 Mc/s and 2101.8 Mc/s may be authorized for Government earth station transmissions in connection with Project Appollo, until December 31, 1970, at the following sites only:

Goldstone, Calif. (35°23′20′′ N., 116°50′53′′* W.)

Guam, Mariana Islands (13°18'34'' N., 144°44'10'' E.)

Cape Kennedy, Fla. (28°28′54'' N., 80°34'35'' W.)

Kauai, Hawaii (22°07'31" N., 159°40'16" W.) Corpus Christi, Tex. (27°39′19′′ N., 97°22′49′′*

W.)

Full power operation shall occur only when spacecraft launched as a part of Project Apollo are in actual flight. During such operation, the carrier shall be fully modulated at all times to ensure dispersal of the transmitted power, and transmissions shall not occur using antenna elevation angles of less than 3 above the horizontal plane. Operation at all other times shall be confined to laboratory tests or subdued radiation spacecraft tests, subject to the condition that no harmful interference is caused to TV broadcast auxiliary stations.

US97 The use of the band 1605-1715 kes by non-Government stations in the aeronautical radionavigation service is limited to the frequencies 1638 and 1708 kc/s. Stations in the radiolocation service shall not cause harmful interference to stations in the aeronautical radionavigation service operating on 1638 or 1708 kc/s.

US98 The frequency 243 Mc/s is the frequency in this band for use by Government and non-Government survival craft stations and equipment used for survival purposes. US99 In the band 1660-1700 Mc/s, the meteorological aids service (radiosonde) will to the maximum extent practicable confine Its operations above the frequency 1670 Mc/s. Whenever it is necessary to operate radioBondes in the band 1660-1670 Mc/s within the United States, the radio astronomers will be notified in a timely manner.

US100 In the Additional Protocol to the Final Acts of the Space EARC, Geneva, 1963, a declaration on behalf of the USA states that the USA cannot accept any obligation to cbserve the exceptions claimed by Cuba in those footnotes to the Table of Frequency Allocations which were adopted by the EARC and which specifically name Cuba.

US101 In the band 1660-1670 Mc/s, the radio astronomy service must accept such interference as may be received from the meteorological-satellite service.

30 F.R. 15701, Dec. 21, 1965]

Subpart C-Emissions

2.201 Emission, modulation, and transmission characteristics.

The following system of designating emission, modulation and transmission characteristics shall be employed.

(a) Emissions are designated accord

Type of modulation in carrier

(1) Absence of any modulation intended to carry information__-. (2) Telegraphy without the use of a modulating audio frequency----(3) Telegraphy by the on-off keying of a modulating audio frequency or audio frequencies, or by the on-off keying of the modulated emission (special case: an unkeyed modulated emission).

(4)

(5)

Telephony (including sound broadcasting)

Fascimile (with modulation of main carrier either directly or by a frequency modulated sub-carrier)__ (6) Television (visual only). (7) Four-frequency diplex telegraphy-(8) Multichannel voice-frequency telegraphy

(9) Cases not covered by the above_--(e) Supplementary characteristics: (1) Double sideband__ (2) Single sideband:

(1) Reduced carrier---

(11) Full carrier_-_

(111) Suppressed carrier...

(3) Two independent sidebands... (4) Vestigial sideband..

(6) Pulse:

Amplitude modulation. With no modulation....

4

5

6

7 9

(None)

(1) Amplitude modulated__________ D (11) Width (or duration) modulated

E

sary bandwidth; in such cases a different percentage may prove useful.

(b) Necessary bandwidth: For a given class of emission, the minimum value of the occupied bandwidth sufficient to ensure the transmission of information at the rate and with the quality required for the system employed, under specified conditions. Emissions useful for the good functioning of the receiving equipment as, for example, the emission corresponding to the carrier of reduced carrier systems, shall be included in the necessary bandwidth.

(c) The necessary bandwidth may be determined by one of the following methods:

(1) Use of the formulas included in the following Table which also gives examples of necessary bandwidths and designation of corresponding emissions;

(2) Computation in accordance with Recommendations of the International Radio Consultative Committee (C.CIR.);

(3) Measurement, in cases not covered by subparagraphs (1) or (2) of this paragraph.

(d) The value so determined should be used when the full designation of an emission is required. However, the necessary bandwidth so determined is not the only characteristic of an emission to be considered in evaluating the interference that may be caused by that emission.

(e) In the formulation of the table, the following terms have been employed: B=Necessary bandwidth in cycles per second.

B=Telegraph speed in bauds.

N=Maximum possible number of black plus white elements to be transmitted per second, in facsimile and television. M=Maximum modulation frequency in cycles per second. C=Subcarrier frequency in cycles per

second.

D=Half the difference between the maximum and minimum values of the instantaneous frequency. Instantaneous frequency is the rate of change of phase.

t=Pulse duration in seconds.

K=An overall numerical factor which varies according to the emission and which depends upon the allowable signal distortion.