§ 23.27

Experimental research.

The licensee of a station may be authorized to use a transmitter which is licensed for fixed public or fixed public press service for experimental research in accordance with the rules and regulations governing the experimental service upon the condition that no interference will be caused to the public service. Experimental (Research) and Experimental (Developmental) Stations authorized to operate as point-to-point telegraph or telephone stations shall comply with the rules governing fixed public radio services in addition to the rules and regulations governing experimental radio services.

§ 23.28 Special temporary authoriza

tion.

Requests for special temporary authority must be accompanied by a showing that interference will not be caused to the fixed public or fixed public press service for which the station is primarily licensed; and, in addition, such requests must be accompanied by the following:

(a) A statement of the call signs, location, and frequencies of the transmitting station; the call signs, location, and frequencies of the received station; and the type or types of emission to be employed by both stations.

(b) A statement as to whether or not the frequencies are to be used for contact control purposes only.

(c) A statement of the period for which the temporary authority is desired.

(d) A statement describing the service which is to be rendered.

(e) Where authority is requested to communicate with a new foreign or overseas point, a statement describing the proposed contract, agreement or other arrangement to be made with any foreign administration or carrier, governing the operation of the proposed circuit, together with copies of any documents constituting such proposed contract, agreement or arrangement; and where extension is requested of existing authority to operate a circuit, a statement describing any modification in the contract, agreement or arrangement governing the operation of the circuit, made since the filing of the last preceding application for the authority sought to be extended, together with copies of any documents constituting such modification: Provided, however, That if copies of a proposed

contract, agreement, arrangement or modification thereof have already been filed under § 43.52 of this chapter, reference to such prior filing may be made in lieu of refiling such documents hereunder.

§ 23.29 License period and expiration time.

Licenses for stations operating in the fixed public radiocommunications services will be issued for a period of 2 years unless otherwise stated in the instrument of authorization. The date of expiration of such licenses shall be the 1st day of December, and each station license will be issued so as to expire at the hour 3 a. m., eastern standard time. Unless otherwise ordered, when an application for a new station license is granted within three months of the expiration date for licenses of the particular class of station involved, the license shall be issued for the unexpired period of the current license term and for the full succeeding term. If granted more than three months from the normal expiration date, the license shall be issued for the unexpired period of the current license term only.

Each construction permit for a radio station in the fixed public service will specify the date of grant as the earliest date of commencement of construction and a maximum of eight months thereafter as the time within which construction shall be completed and the station ready for operation, unless otherwise determined by the Commission upon proper showing in any particular case. § 23.32

Equipment and service tests.

(a) Upon completion of construction of a radio station in exact accordance with the terms of the construction permit, the technical provisions of the applica

tion therefor and the other applicable provisions of this part and prior to filing of application for license, the permittee is authorized to test the equipment for a period not to exceed 10 days: Provided, That:

(1) The engineer in charge of the district in which the station is located is notified 2 days in advance of the beginning of tests.

(2) The Commission may notify the permittee to conduct no tests or may cancel, suspend, or change the date of beginning for the period of such tests as and when such action may appear to be in the public interest, convenience, and necessity.

(b) When construction and equipment tests are completed in exact accordance with the terms of the construction permit, the technical provisions of the application therefor, and the other applicable provisions of this part, and after an application for station license has been filed with the Commission showing the transmitter to be in satisfactory operating condition, the permittee is authorized to conduct service tests in exact accordance with the terms of the construction permit for a period not to exceed 30 days: Provided, That:

(1) The engineer in charge of the district in which the station is located is notified 2 days in advance of the beginning of the tests.

(2) The Commission reserves the right to cancel such tests or suspend, or change the date of beginning for the period of such tests as and when such action may appear to be in the public interest, convenience, and necessity by notifying the permittee.

(3) Service tests will not be authorized after the expiration date of the construction permit.

(c) The authorization for tests embodied in paragraphs (a) and (b) of this section shall not be construed as constituting a license to operate but as a necessary part of the construction.

§ 23.33 Transmissions during international silent period.

During the international silent period prescribed for stations in the maritime mobile service, fixed public and fixed public press stations may transmit communications, other than distress or urgent safety messages, to maritime mobile stations required by treaty or statute to maintain a watch on the international distress frequency only if the licensee of

such fixed station has made a satisfactory showing to the Commission that the continuation of such communications through the international silent period will not interfere with the maintenance of the prescribed watch by such maritime mobile stations.

§ 23.34 Frequency measurement.

Each station shall provide for the measurement of all frequencies assigned thereto and establish a procedure for checking them regularly. These meas

urements shall be made by means independent of the frequency control of the transmitter and shall be of an accuracy sufficient to detect deviations from the assigned frequency within one-half the allowed tolerance.

§ 23.35 Compliance with tariff require

ments.

No licensee authorized to perform common carrier service by means of radio communication shall engage in such service without compliance with all statutory provisions and regulations of the Commission relative to the filing of tariffs; and nothing contained in this part shall be deemed as a waiver or modification of any such statutory provision or regulation.

§ 23.36 Posting of license.

The license of a station shall be posted in a conspicuous place in the main transmitter building of the station or kept in such building where it is readily available for inspection purposes.

§ 23.37

Station identification.

(a) General. Every radiotelegraph or radiotelephone station in the International Fixed Public or Fixed Public Press Service shall transmit, as provided below, the identifying call sign or other approved identification signal on each of its assigned frequencies below 30 Mc/s on which energy is being radiated.

(b) When required. (1) The call sign assigned to each frequency shall be transmitted on that frequency at the beginning and end of each period of use of the frequency.

(2) During regular operation on any frequency, the call sign or other approved identification signal shall be transmitted at least at hourly intervals within the period from 10 minutes before to 10 minutes after each hour. If identification during this period would require an interruption in the transmission of a radio

photo, a telephone conversation, an addressed program or a multiple addressed press message, or a break in the continuity of a "conference" or "leased line" type of service, the identifying signal shall be transmitted at the first break in, at the conclusion of, or simultaneously with, the particular transmission as described below.

(c) Methods of transmission. (1) All identifying signals shall be transmitted in such a manner as to permit identification without special equipment other than communication type receivers, except as provided in paragraph (e) of this section. When emissions are being used which are not capable of identification without special equipment, the identifying signal shall be transmitted by one of the following methods:

(i) By interrupting the transmission and transmitting the call sign in a manner which can be identified without special equipment.

(ii) By superimposing the call sign or other approved identification signal on the emission being transmitted without interrupting the transmission as provided for by paragraphs (e) and (f) of this section.

(d) Emissions to be used. (1) Except as otherwise provided, the following emissions shall be used for identification:

(i) Radiotelegraph stations. The identifying call sign shall be transmitted by International Morse code at a speed not to exceed 25 words per minute and shall consist of the signal “QRA de" followed by the call sign. This transmission shall be made at least three times.

(ii) Radiotelegraph stations using telephone type emissions. When telephone type emissions are being used in accordance with § 23.11, identification may be made by voice and shall consist of announcing three times in English the call sign of the frequency being used.

(iii) Radiotelephone stations. The identifying transmission may be made utilizing either telegraph or telephone type emissions. When telegraph emission is used, the transmission shall be made in International Morse Code at a speed not to exceed 25 words per minute and shall consist of the signal "QRA de" followed by the call sign. This transmission shall be made at least three times.

When telephone emission is used, the identification shall consist of announcing three times in English the call sign of the frequency being used, provided that all privacy or secrecy devices

shall be removed from the circuit during such transmissions.

(e) Superimposed identification. Radiotelegraph or radiotelephone stations identifying simultaneously with transmission of traffic: call signs or the general identification signal described in paragraph (f) of this section may be superimposed on the emission being transmitted by any method which will make identification possible with communication type receivers provided that approval of any such method shall first have been obtained from the Federal Communications Commission. (Approval by the Federal Communications Commission of any means of identification of complex emissions by superimposing identification of regular transmissions will be given upon satisfactory completion of coordinated tests thereof by the applicant and the Commission's Field Engineering Bureau.) Commission approval may be withdrawn if at any subsequent time harmful interference to adjacent frequencies is caused by the superimposed identification. When superimposed identification by call sign is used, the identifying signal shall consist of "QTT de (call sign)" transmitted at least three times in International Morse Code at a speed not to exceed 25 words per minute.

(f) General identification signal. When an approved method of superimposed identification is used, the identification signal shall consist of "QTT de (abbreviated name of company recorded with the Commission) (abbreviated name of station recorded with the Commission)." (It is suggested that "abbreviated company name" consist of two to five letters such as the initials of the company name and that "abbreviated name of station" consist of two or three letters indicating the name of the city where the licensee's message center is located. Both of these abbreviations shall be notified to the Commission before being used for identification.) This general identification signal shall be transmitted in International Morse Code at a speed not to exceed 25 words per minute and may be transmitted continuously or intermittently as desired provided that it shall be transmitted for at least five minutes total time during the period from 10 minutes before to 10 minutes after each hour that energy is being radiated on the frequency. The same signal may be superimposed on all transmissions being made at a particular sta

tion: Provided, however, That licensed call signs shall be transmitted on the frequencies to which they are assigned as often as is practicable and reasonable or at least at the beginning and end of each period of use of each frequency.

(g) Identification by printer. Notwithstanding the other provisions of this section with respect to methods of transmission, when single channel start-stop 5 unit code printer equipment is being used, the identifying call sign may be transmitted by means of printer signals. When identification is made by printer signals, it shall consist of the call sign for the particular frequency being used and shall be made at least three times at a speed of approximately 60 words per minute.

§ 23.38 Experimental points of communication, limitations.

Experimental (Research) or Experimental (Developmental) stations licensed to operate as point-to-point telegraph or telephone stations in the fixed public service may communicate only with other experimental stations located within the continental limits of the United States (except Alaska): Provided, however, That upon application the Commission may authorize such a station to communicate with one or more specific points in Alaska, Hawaii, possessions of the United States, or with a specific foreign point. In each such case, the Commission will determine the nature of the experimental transmissions which may be made to such point of communication.

§ 23.39

Inspection of tower lights and associated control equipment.

(a) The licensee of any fixed public radio station which has an antenna or antenna supporting structure(s) required to be illuminated pursuant to the provisions of section 303 (q) of the Communications Act of 1934, as amended:

(1) Shall make a visual observation of the tower lights at least once each 24 hours to insure that all such lights are functioning properly as required.

(2) Shall report immediately by telephone or telegraph to the nearest Air Traffic Communications Station or office of the Federal Aviation Agency any observed failure of tower lights, not corrected within 30 minutes, regardless of the cause of such failure. Further notification by telephone or telegraph shall

be given immediately upon resumption of the required illumination.

(3) Shall inspect at intervals of at least once each 3 months all flashing or rotating beacons and automatic lighting control devices to insure that such apparatus is functioning properly as required. (b) Where an antenna or antenna supporting structure(s) is required to be illuminated the licensee shall make entries in the radio station log appropriate to the requirements of paragraph (a) of this section as follows:

(1) The time the tower lights are turned on and off if manually controlled. (2) The time the daily visual observation of the tower lights is made.

(3) In the event of any observed failure of a tower light, (i) nature of such failure; (ii) time the failure was observed; (iii) time and nature of the adjustments, repairs or replacements made; (iv) Air Traffic Communications Station (F.A.A.) notified of the failure of any tower light not corrected within 30 minutes and the time such notice was given; (v) time notice was given to the Air Traffic Communications station (F.A.A.) that the required illumination was resumed.

(4) Upon completion of the periodic inspection required at least once each 3 months, (i) the date of inspection and the condition of all tower lights and associated tower lighting control devices; (ii) any adjustments, replacements or repairs made to insure compliance with the lighting requirements.

§ 23.40 Changes in height or location of

antenna.

The licensee of a fixed public radio station, the transmitter of which is authorized at a fixed location, shall not make any changes, without the express authority of the Commission, either in the height or the location of the antenna or its supporting structures, except when the existing or proposed antenna or structure has a maximum height not in excess of 100 feet above the ground, changes in height or local changes in location may be made without specific authorization. In no case shall any change in the height or location of the antenna or its supporting structures be made without authority when located or proposed to be located within 5 miles of an airport recognized by the Federal Aviation Agency or within 5 miles of the center line of an established Federal airway.

Each licensee of a station at a specific location, or of stations under a common transmitter control point, shall, within 40 days after the close of the quarter, submit a quarterly report in duplicate, stating in part I of such report each frequency and associated call sign contained in the license (s), number of hours each such frequency was used to each point of communication for each class of service rendered (such as telegraph, telephone, program, or radiophoto), and the total hours each such frequency was used; stating in part II of such report the volume of paid public correspondence transmitted to, received from, and the total with respect to each point of communication named in the license (s); and stating in part III of such report a list of the frequencies which were received from all stations beyond the continental limits of the United States, indicating call signs, locations, type of emissions, and whether such frequencies were received normally or occasionally: Provided, however, That this report is not required for stations operating on frequencies above 30 Mc/s which are used primarily to control the operation of, or to relay messages to or from, another radio station for which such a report is submitted or for the operation of stations on frequencies above 30 Mc/s which are used as an extension to or an integral part of the domestic communication network.

§ 23.44 Station inspection.

The licensee of any radio station shall make the station available for inspection by representatives of the Commission at any reasonable hour.

§ 23.45

Operator license, posting of.

The original license of each station operator shall be posted at the place where he is on duty.

§ 23.46 Operators, place of duty.

(a) One or more licensed operators of the grade specified by the rules and regulations shall be on duty at the place where the transmitting apparatus of each station is located and in actual charge thereof whenever it is being operated: Provided, however, That:

(1) Subject to the provisions of paragraph (b) of this section, in the case of a station where remote control is used, the Commission may modify the foregoing requirements upon proper application and showing being made so that such operator or operators may be on duty at the control station in lieu of the place where the transmitting apparatus is located.

(2) In the case of two or more stations licensed in the name of the same person to use frequencies above 30 Mc/s only, a licensed radio operator of any class except amateur or holder of restricted radiotelephone or radiotelegraph operator permit who has the station within his effective control may be on duty at any point within the communication range of such station in lieu of the transmitter location or control point during the actual operation of the transmitting apparatus and shall supervise the emissions of all such stations so as to insure the proper operation in accordance with the station license.

(b) Authority to employ an operator at the control point in accordance with paragraph (a) (1) of this section shall be subject to the following conditions:

(1) The transmitter shall be so installed and protected that it is not accessible to other than duly authorized persons.

(2) The emissions of the transmitter shall be continuously monitored at the control point by a licensed operator of the grade specified for the class of station involved.

(3) Provision shall be made so that the transmitter can quickly and without delay be placed in an inoperative con