§ 21.805 Modulation requirements.

(a) The use of modulating frequencies higher than 3000 cycles per second for single channel radiotelephony or tone signaling on frequencies below 500 Mc/s is not authorized.

(b) When amplitude modulation is used, the modulation percentage shall be sufficient to provide efficient communication and shall normally be maintained above 70 percent on peaks, but shall not exceed 100 percent on negative peaks.

(c) When phase or frequency modulation is used for single channel radiotelephony on frequencies below 500 Mc/s, the deviation arising from modulation shall not exceed plus or minus 15 kc/s from the unmodulated carrier.

(d) Each unmultiplexed radiotelephone transmitter having more than 3 watts plate power input to the final radio frequency stage and initially installed at the station in this service after September 4, 1956, shall be provided with a device which will automatically prevent modulation in excess of that specified in paragraphs (b) and (c) of this section which may be caused by greater than normal audio level.

§ 21.806 Remote control operation of mobile television pickup stations.

(a) Mobile television pickup stations (including non-broadcast) may be operated by remote control from fixed locations for periods not to exceed 6 months, provided the Commission's Engineer-inCharge of the radio district wherein operation is to be conducted shall be notifiled in writing by the licensee prior to operation of the facilities by remote control. A copy of such notification shall be kept with the station license and shall contain the following information:

(1) The call sign and specific location of the transmitter.

(2) The exact frequencies to be used. (3) The location of the transmitter control point.

(4) The commencement and termination dates of operation from the specified location.

(b) The Commission may, upon adequate showing by the licensee as to why the television pickup operations should not be conducted under a fixed station authorization, renew the authority granted under the provisions of paragraph (a) of this section.

(c) Reference should be made to $21.114 concerning mobile station an

(a) Authorizations may be issued upon proper application for the use of frequencies listed in § 21.801 by stations in the Local Television Transmission Service for rendition of temporary service to subscribers under the following conditions:

(1) When a fixed station is to remain at a single location for less than six months, the location is considered to be temporary.

(2) When a fixed station authorized to operate at temporary locations is installed and it subsequently becomes necessary for the station to operate from such location for more than six months, applications (FCC Forms 401 and 403) for a station authorization to specify the permanent location shall be filed at least thirty days prior to the expiration of the six month period.

(3) The station shall be used only for rendition of communication service at a remote point where the provision of wire facilities is not practicable.

(4) The antenna height employed at any location shall not exceed the criteria set forth in § 17.3 of this chapter unless, in each instance, authorization for use of a specified maximum antenna height for each location has been obtained from the Commission prior to erection of the antenna. Requests for such authorization shall be accompanied by FCC Form 401-A completed in triplicate.

(5) Applications for such stations shall comply with the provisions of § 21.706(c).

(b) Applications for authorizations to operate stations at temporary locations under the provisions of this section shall be made upon FCC Form 401, and may be accompanied by completed FCC Form 403 for simultaneous consideration provided the equipment to be used is of "packaged" design. Blanket applications may be submitted for the required number of transmitters.

[28 F.R. 13002, Dec. 5, 1963, as amended at 30 F.R. 7176, May 28, 1965]

§ 21.808 Notification of station opera tion at temporary locations.

(a) The licensee of stations which are authorized pursuant to the provisions of § 21.807 shall notify the

Charge of the radio district wherein operation is to be conducted, of each period of operation at least two days prior to installation of the facilities. This notification shall include:

(1) The call sign and specific location of the transmitter.

(2) The location of the transmitter control point.

(3) The location of the transmitting or receiving station with which it will communicate and the identity of the correspondent operating such facilities.

(4) The exact frequency or frequencies to be used.

(5) The public interest, convenience and necessity to be served by operation of the proposed installation.

(6) The commencement and anticipated termination dates of operation from each location. In the event the actual termination date differs from the previous notification, written notice thereof promptly shall be given to the Commission and its Engineer-in-Charge.

(b) A copy of the foregoing notification shall be posted with the station license (see § 21.214).

§ 21.809 Stations affected by coordination distance procedures. Each application for initial installation of a radio station in this service, or for installation of additional transmitters, or for authority to communicate with new points, shall comply with the provisions of § 21.706(c).

30 FR. 7176, May 28, 1965]

Sec.

23.22 23.23

Band width, multiple channel.
Use of frequencies for radiotelegraph
communication within the conti-
nental United States.

23.24 Correspondents and points of communication.

23.54 Use of double sideband radiotelephone. AUTHORITY: The provisions of this Part 23 issued under secs. 4, 303, 48 Stat. 1066, 1082, as amended; 47 U.S.C. 154, 303. Interpret or apply sec. 301, 48 Stat. 1081; 47 U.S.C. 301.

SOURCE: The provisions of this Part 23 appear at 28 F.R. 13032, Dec. 5, 1963, except as otherwise noted.

§ 23.1

FIXED PUBLIC SERVICES

Fixed public service.

The term "fixed public service" means a radiocommunication service carried on between fixed stations open to public correspondence.

§ 23.2

Fixed public press service.

The term "fixed public press service" means a limited radiocommunication service carried on between point-to-point telegraph stations, consisting of transmissions by fixed stations open to limited public correspondence of news items, or other material related to or intended for publication by press agencies, newspapers, or for public dissemination. In

addition, these transmissions may be directed to one or more fixed points specifically named in a station license, or to unnamed points in accordance with the provisions of § 23.53.

NOTE: This section is not intended as a definition of any press classification. Correspondence admissible under any press classification is determined by the tariffs of the various common carriers on file with the Commission.

§ 23.4 Fixed station.

The term "fixed station" in the fixed public or fixed public press service includes all apparatus used in rendering the authorized service at a particular location under a single instrument of authorization.

§ 23.5 Point-to-point telegraph station.

The term "point-to-point telegraph station" means a fixed station authorized for radiotelegraph communication.

§ 23.6 Point-to-point telephone station. The term "point-to-point telephone station" means a fixed station authorized for radiotelephone communication. § 23.7 Point of communication.

The term "point of communication” means a specific location designated in the license to which a station is authorized to communicate for the transmission of public correspondence.

§ 23.8 Authorized service.

The term "authorized service" of a point-to-point radiotelegraph or radiotelephone station means the transmission of public correspondence to a point of communication as defined in § 23.7 subject to such special provisions as may be contained in the license of the station or in accordance with § 23.53.

or independent sideband (A3B) transmission.

§ 23.11

Use of radiotelephone emissions by radiotelegraph stations.

The licensee of a radiotelegraph station, using frequencies below 30 Mc/s, may be authorized to use radiotelephone emissions as defined in § 23.10 for the following purposes:

(a) Transmission of addressed program material as set forth in § 23.51. (b) Controlling the transmission or reception of addressed program material. (c) Controlling the transmission or reception of facsimile material.

§ 23.12 Use of radiotelegraph emissions by radiotelephone stations.

The licensee of a point-to-point radiotelephone station may be authorized to use type A0, A1, A2, F1, or F2 emission for identification, for test purposes or for the exchange of service messages. § 23.13 Place of filing applications, fees, and number of copies.

Every application for an authorization in the international fixed public radio services shall be submitted to the Commission's office at Washington, D.C., 20554. Each application, including exhibits and attachments thereto, shall be filed in duplicate, and shall be accompanied by the fee prescribed in Subpart G of Part 1 of this chapter. [30 F.R. 14808, Nov. 30, 1965]

§ 23.20 Assignment of frequencies.

(a) Only those frequencies which are in accordance with § 2.106 of this chapter may be authorized for use by stations in the Fixed Public and Fixed Public Press Services. Selection of specific frequencies within such bands shall be made by the applicants therefor. After an application has been filed with the Commission for a particular frequency, its availability for assignment as requested will be determined by a study of the probabilities of interference to and from existing services assigned on the same or adjacent frequencies and, if necessary, by coordination with other agencies utilizing frequencies in these ranges. The applicant will be notified of the results of such study and coordination. All new assignments of frequencies may be made subject to certain conditions as may be required to minimize the possibility of harmful interference to existing services.

(b) In order to minimize possible harmful 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, any applicant for a station authorization other than mobile, temporary base, temporary fixed, Citizens Radio, Civil Air Patrol, or Amateur seeking a station license for a new station, a construction permit to construct a new station or to modify an existing station license in a manner which would change either the frequency, power, antenna height or directivity, or location of such a 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, at the time of filing such application with the Commission, simultaneously notify the Director, National Radio Astronomy Observatory, P. O. Box #2, Green Bank, West Virginia, 24944, in writing, of the technical particulars of the proposed station. Such notification shall include the geographical coordinates of the antenna, antenna height, antenna directivity if any, proposed frequency, type of emission, and power. In addition, the applicant shall indicate in his application to the Commission the date notification was made to the Observatory. After receipt of such applications, the Commission will allow a period of twenty (20) days for comments or objections in response to the notifications indicated. If an objection to the proposed operation is received during the twenty day period from the National Radio Astronomy Observatory for itself or on behalf of the Naval Radio Research Observatory, the Commission will consider all aspects of the problem and take whatever action is deemed appropriate.

type of emission by § 2.202 of this chapter. § 23.23

Use of frequencies for radiotelegraph communication within the continental United States.

Licensees of point-to-point radiotelegraph stations may use any frequency authorized in a station license for communication between designated points within the 48 contiguous states and the District of Columbia upon the express condition that the use of any frequency above 5000 kc/s shall be subject to the limitation that no interference shall be caused to the international service, or to service with Alaska or Hawaii; and in the event such interference is caused the licensee shall immediately discontinue the use of the frequency or frequencies producing such interference and operation thereon may be conducted only at times when such interference will not be caused.

§ 23.24 Correspondents and points of

communication.

Each instrument of authorization issued for fixed public or fixed public press service shall authorize communication to the points of communication and to the organizations, agencies, or persons specified therein only, except as provided by § 23.53: Provided, however, That in the event of a change in an organization, agency, or person specified or a change in the effective control of such organization, agency, or person, the licensee shall immediately notify the Commission of such change and shall file an application for modification of the instrument of authorization: And provided further, That where such change is occasioned by reason of circumstances beyond the control of the licensee, communication under the then outstanding instrument of authorization shall be permitted to continue pending consideration of and action upon the application for modification of the instrument of authorization.