(d) Each station license issued to authorize the use and operation of one or more marine-utility stations or shipyard mobile stations shall designate for those stations a single call sign consisting of two letters followed by four digits, taken from the group KA through KZ.

(e) Stations on land in the maritime radiodetermination service shall be assigned individual call signs each consisting of three letters followed by three digits, taken from either the group KAA through KZZ or the group WAA through WZZ.

(f) Marine fixed stations and marine relay stations shall be assigned individual call signs each consisting of three letters followed by two digits, taken from either the group KAA through KZZ or the group WAA through WZZ.

(g) Marine control stations and marine repeater stations shall be assigned individual call signs each consisting of three letters followed by two digits, taken from either the group KAA through KZZ or the group WAA through WZZ.

(h) Marine receiver-test stations shall be assigned individual call signs each consisting of three letters followed by three digits, taken from either the group KAA through KZZ or the group WAA through WZZ.

(i) Developmental stations shall be assigned call signs of the category assignable under the provisions of this section to the class of station associated with the respective developmental station.

(j) In accordance with the preceding paragraphs of this section, call signs shall be assigned on a strict sequence basis, without advance reservation of particular call signs for specific stations or specific purposes.

[28 F.R. 13972, Dec. 21, 1963, as amended at 29 F.R. 5799, May 1, 1964]

§ 81.73 Operation during emergency.

(a) The licensee of any station subject to this part may, during a period of emergency in which the normal communication facilities are disrupted as a result of hurricane, flood, earthquake, or similar disaster, utilize such station for emergency communication service in communicating in a manner other than that specified in the instrument of authorization or in the rules and regulations governing the operation of such stations: Provided, (1) That as soon as possible after the beginning of such

emergency use, notice shall be sent to the Commission at Washington, D.C., 20554, and to the Engineer in Charge of the radio district in which the station is located, stating the nature of the emergency and the emergency use being made of the station; (2) that such emergency use of the station shall be discontinued as soon as substantially normal communication facilities are again available; and (3) the Commission and the Engineers in Charge be notified immediately when such special use of the station is terminated: And, provided further, That in no event shall any station engage in emergency transmission on frequencies other than, or with power in excess of, that specified in the instrument of authorization or as otherwise expressly provided by the Commission, or by law: And provided further, That the Commission may, at any time, order the discontinuance of any such emergency communication undertaken under this section.

(b) The Commission may authorize the licensee of any radio station, during a period of national emergency, to operate its facilities upon such frequencies. with such power and points of communication, and in such a manner beyond that specified in the station license as may be requested by the Army, Navy or Air Force.

§ 81.74 Notice of involuntary discontinuance, reduction, or impairment of service.

(a) If, for any reason beyond the control of the station licensee, the service provided by a public coast station is discontinued, reduced, or impaired for a period exceeding 24 hours, the station licensee shall immediately notify1 the Commission at Washington, D.C. 20554, and the Commission's engineer in charge of the radio district in which the station is located. In such cases, the licensee shall furnish full particulars as to the reasons for such discontinuance, reduction, or impairment of service including a statement as to when normal service is expected to be resumed. In the event such changes in station operation include discontinuance, reduction, or suspension of a watch normally kept on 500 kHz or 2182 kHz, immediate notification1 thereof shall be given by the

1 In the Alaska area, notification shall be given to the U.S. Coast Guard office in Juneau, Alaska, and to the Commission's engineer in charge at Anchorage, Alaska.

66-109-72- -3

station licensee to the nearest district office of the U.S. Coast Guard and to the Commission's engineer in charge of the radio district in which the station is located together with notification of the estimated or known time of resumption of such watch. When normal service is resumed, immediate notification 1 thereof shall be given to the Commission at Washington, D.C. 20554, and to the Commission's engineer in charge of the radio district in which the station is located. When the watch to which reference is made herein is resumed, immediate notification 1 thereof shall be given to the Coast Guard and to the Commission's engineer in charge.

1

(b) Notification need not be given with respect to involuntary suspension or substantial reduction of the normal service of a limited coast station (provided a watch normally kept by such station on 500kc/s or 2182 kc/s is not reduced or suspended thereby) or any other station subject to this part, except public coast stations as provided in paragraph (a) of this section, during any period of involuntary reduction or suspension not exceeding 10 days. Whenever the period of such involuntary suspension or reduction exceeds 10 days, notification thereof shall be given, except for marine-utility stations and shipyard mobile stations, to the Commission's Engineer in Charge of the radio district in which the station is located, together with notification of the known or estimated time of resumption of normal operation. In the event any reduction or suspension of the service of a limited coast station causes a reduction or suspension of a watch normally kept on 500 kc/s or 2182 kc/s, immediate notification thereof shall be given by the station licensee to the nearest district office of the U.S. Coast Guard and to the Commission's Engineer in Charge of the radio district in which the station is located, together with notification of the estimated or known time of resumption of such watch.

NOTE: For rules covering the filling of applications for authority under sec. 214 of the Communications Act, see Part 63 of this

chapter.

[28 F.R. 13967, Dec. 21, 1963, as amended at 36 F.R. 20957, Nov. 2, 1971]

§ 81.75 Notice of voluntary discontinuance, reduction, or impairment of service.

1

When the service of any station subject to this part (other than a marineutility station or a shipyard mobile station) is discontinued, reduced or impaired for any reason within the control of the station licensee, immediate notification thereof shall be given to the Commission's engineer in charge of the radio district in which the station is located, together with, in the case of suspension, a statement of the estimated or known time of resumption of normal service. In the case of a public coast station, such notification shall be given as soon as practicable. In respect to any other class of station (except a marineutility station or a shipyard mobile station) subject to this part, such notification need be made only when the discontinuance, reduction, or impairment of service continues for a period of more than 10 days. In the event any voluntary suspension, reduction, or discontinuance of operation includes discontinuance, reduction, or suspension of a watch normally kept by any coast station on 500 kHz or 2182 kHz, immediate notification 1 thereof shall be given by the station licensee to the nearest district office of the U.S. Coast Guard and to the Commission's engineer in charge of the radio district in which the station is located, together with notification of the estimated or known time of resumption of any such watch that has been suspended. [36 F.R. 20958, Nov. 2, 1971]

§ 81.76 Cancellation of license.

In all cases of permanent discontinuance of operation of stations subject to this part, the licensee shall immediately forward the station license to the Washington, D.C., office of the Commission for cancellation: Provided, That this requirement shall apply to the permanent discontinuance of operation of marineutility stations or shipyard mobile stations, only when the operation of all stations of either class authorized by one station license is permanently discontinued.

NOTE: See 61.57 of this chapter for procedure in canceling applicable tariffs.

1 In the Alaska area, notification shall be given to the U.S. Coast Guard office in Juneau, Alaska, and to the Commission's engineer in charge at Anchorage, Alaska.

Subpart D-General Station
Requirements

§ 81.101 Inspection of stations.

Pursuant to section 303(n) of the Communications Act, all stations subject to this part and all station records required by this part shall be available for inspection by authorized representatives of the Commission at such times and intervals which, within the discretion of the Commission, are considered reasonable and necessary to assure compliance with applicable rules, regulations, laws, treaties and international agreements.

[28 F.R. 13975, Dec. 21, 1963]

§ 81.102 Posting station licenses and transmitter identification cards or plates.

(a) The current authorization or a clearly legible photocopy thereof, for each station (other than a marineutility station) at a permanent location, or at a single temporary location, shall be posted in a conspicuous place at the principal control point of the station, and a photocopy of such authorization shall be posted at all other control points listed on the authorization. If a photocopy of the authorization is posted at the principal control point, the location of the original shall be stated on that photocopy. In addition, an executed Transmitter Identification Card (FCC Form 452-C) or a plate of metal or other durable substance, legibly indicating the call sign and the licensee's name and address, shall be affixed, readily visible for inspection, to each transmitter of such stations when it is not in view of, or is not readily accessible to, the operator at the principal control point.

(b) The current station authorization or a clearly legible photocopy thereof, for a single marine-utility station and for each single station of any other class subject to this part, which is of portable nature and is authorized for use and operation at two or more temporary locations, shall be posted either at the control point of the station, in a conspicuous place or shall be affixed, readily visible for inspection, to the transmittng apparatus or, if the transmitting apparatus is contained in a cabinet or other structure, affixed, readily visible for inspection, to such cabinet or structure. If a photocopy of the authorization is

posted, the location of the original shall be stated on the photocopy.

(c) A current license authorizing a plurality of marine-utility stations, pursuant to § 81.68 shall be retained by the licensee at any location where it is readily accessible for inspection. In addition, an executed Transmitter Identification Card (FCC Form 452-C) or a plate of metal or other durable substance, legibly indicating the call sign and the licensee's name and address, shall be affixed, readily visible for inspection, to each transmitter of such stations: Provided, That, if the transmitter is not in view of the operating position, or is not readily accessible for inspection, then such card or plate shall be affixed to the control equipment at the transmitter operating position or posted adjacent thereto.

(d) A current land station license authorizing one or more shipyard mobile stations, pursuant to § 81.22(e), or a clearly legible photocopy thereof, shall be posted in a conspicuous place at the principal control point of the land station; and a photocopy of such license shall be posted at all other control points listed on the license. If a photocopy of the license is posted at the principal control point, the location of the original shall be stated on that photocopy. In addition, a photocopy of such license, an executed Transmitter Identification Card (FCC Form 452-C), or a plate of metal or other durable substance shall be available on each shipyard land mobile unit in which a shipyard mobile station is installed, as follows:

(1) A photocopy of the land station license shall be posted in a conspicuous place in the mobile unit or shall be affixed, readily visible for inspection, to the transmitting apparatus or, if the transmitting apparatus is contained in a cabinet or other structure of the mobile unit, affixed, readily visible for inspection, to such cabinet or structure; or

(2) A Transmitter Identification Card (FCC Form 452-C) or a plate of metal or other durable substance, legibly indicating the call sign and the licensee's name and address, shall be affixed, readily visible for inspection, to the transmitter: Provided, That if the transmitter is not in view of the operating position, or is not readily accessible for inspection, then such card or plate shall be affixed to the control equipment at the

(a) Unless otherwise required by exceptional conditions, the radio transmitting and receiving apparatus of each class I public coast station, when a specific location for the station is initially authorized by the Commission, subsequent to January 1, 1952, shall, when such apparatus is to be used and operated on any frequency assignment below 5000 kc/s, be located as close as practicable to the open sea.

(b) Unless otherwise required by exceptional conditions, the radio transmitting and receiving apparatus of each class II public coast station, when a specific location for the station is initially authorized by the Commission subsequent to January 1, 1952, shall be installed at a location which, according to generally established engineering principles and standards, should not result in abnormally high attenuation of emission, insofar as such attenuation is caused by land intervening between that location and the majority of ship stations with which communication is to be effected.

(c) Unless otherwise required by exceptional conditions, the radio transmitting and receiving apparatus of each class III public coast station, the construction of which is authorized by the Commission subsequent to July 1, 1952, shall be centrally located, insofar as practicable, in relation to the center of the geographic water area to which shipto-shore communication is to be provided by the particular coast station, as specified in the related application for construction permit.

(d) Applicants for permits to establish coast stations for transmission within the band 156 to 174 Mc/s shall cooperate in the selection of sites for radio transmitting facilities so as to minimize interference (such, for example, as may be caused by intermodulation) to the service of other coast stations, base stations of any land mobile service, and United States Government stations.

[28 F.R. 13975, Dec. 21, 1963]

§ 81.104 Facilities required for coast

stations.

(a) As a minimum, public coast stations using telegraphy shall be provided

with the facilities designated in this section:

(1) Stations having a frequency assignment within the band 405 to 535 kc/s shall:

(i) Be equipped to transmit efficiently with classes A1 and A2 emission on the general maritime calling frequency (500 kc/s assigned frequency) and on at least one additional radio-channel authorized for working within the band 405 to 535 kc/s;

(ii) Be equipped to receive efficiently classes A1 and A2 emission on all radiochannels authorized for the maritime mobile service of telegraphy within the frequency-band 405 to 535 kc/s.

(2) Stations having a frequency assignment below 150 kc/s shall:

(i) Be equipped to transmit efficiently with class Al emission on at least one radio-channel authorized for working within the band 100 to 150 kc/s;

(ii) Be equipped to receive efficiently class Al emission on all radio-channels authorized for transmission by mobile stations operating in the maritime mobile service for telegraphy within the band 100 to 150 kc/s.

(3) Stations having a frequency assignment above 4000 kc/s shall:

(i) Be equipped to receive efficiently on each assigned frequency, and on each assigned frequency for ship stations using radiotelegraphy as designated in Part 83 of this chapter when such ship station frequency is in the same characteristic portion of the spectrum as is the coast station assigned frequency.

(b) As a minimum, public coast stations using telephony shall be provided with the facilities designated in this section:

(1) Each public coast station licensed to transmit within the band 1605 to 3500 kHz shall be capable of transmitting (and licensed to transmit) A31 or A3H 2 emission on the carrier frequency 2182 kHz with a carrier power not less than the maximum carrier power which it is capable of using on any other carrier frequency in this band for the same emission, except that, in any event, the required carrier power on 2182 kHz need not be more than 100 watts for A31 emission and 50 watts for A3H 2 emission. In

1 Use of emission A3 shall be discontinued effective Jan. 1, 1972; Alaska effective Jan. 1, 1974.

2 Capability to transmit using emission A3H shall be provided effective Jan. 1, 1972; Alaska effective Jan. 1, 1974.

addition, the coast station must be capable of receiving A3 and A3H emissions on the carrier frequency 2182 kHz.

(1) Apparatus to comply with the foregoing requirement of this subparagraph shall include transmitting and/or receiving equipment installed at each location where transmitting and/or receiving equipment, respectively, is installed and regularly used by the particular station to provide service on one or more working frequencies within the band 1600 kc/s to 3500 kc/s.

(ii) Compliance with the requirement of subdivision (i) of this subparagraph shall be a condition precedent to obtaining a new or renewed station license unless the applicant therefor makes a showing satisfactory to the Commission that, for purposes of maritime safety, all or any portion of such apparatus for operation on the 2182 kc/s channel is not necessary for effective transmission and reception to and from mobile stations within the associated working frequency service area of the coast station.

(2) Each coast station licensed to operate in the band 156 to 174 Mc/s shall be able to transmit and receive 156.8 Mc/s.

(c) All coast stations shall comply with the following requirements:

(1) Each coast station licensed to transmit on the carrier frequency 2182 kHz shall be capable of efficiently receiving A3 and A3H emissions on that frequency and shall be capable also of transmitting (and shall be licensed to transmit) A31 and A3H5 emission and receiving A3 and A3H emission on at least one other frequency for working with ship stations in the band 2000 to 3500 kHz.

1

3 Capability to receive A3 emission shall be provided until Jan. 1, 1977. After Jan. 1, 1972, this requirement may be fulfilled by provision of the capability to receive emission A3H.

4 Capability to receive A3H emission shall be provided effective Jan. 1, 1972; Alaska effective Jan. 1, 1974.

5 Capability to transmit A3H emission shall be provided during the period Jan. 1, 1972, to Jan. 1, 1977; Alaska during the period Jan. 1, 1974, to Jan. 1, 1977. After Jan. 1, 1977, capability to transmit using emissions A3A and A3J shall be provided.

(2) Each coast station equipped with radiotelephony to operate in the authorized bands between 156-162 Mc/s shall be able to transmit and receive Class F-3 emissions on the Distress, Safety and Calling frequency 156.8 Mc/s and on one or more working frequencies.

(3) Marine utility stations used on shore shall comply with the requirement of subparagraph (2) of this paragraph. [28 F.R. 13975, Dec. 21, 1963, as amended at 33 F.R. 10857, July 31, 1968; 35 F.R. 7795, May 21, 1970; 35 F.R. 10219, June 23, 1970; 36 F.R. 20958, Nov. 2, 1971]

§ 81.105

Special provisions relative to VHF facilities.

(a) Coast stations at locations separated by less than 150 statute miles, which transmit on a radio-channel above 100 Mc/s, shall minimize any interference between the particular stations using the same radio-channel above 100 Mc/s by a mutually agreeable time-sharing arrangement, subject to direction by the Commission if agreement cannot be attained by the involved station licensees. In addition, where practicable, such licensees shall use directive antennas to minimize interference between the particular stations.

(b) Coast stations at locations separated 150 statute miles or more, which transmit on a radio-channel above 100 Mc/s, shall minimize interference between the particular stations using the same radio-channel above 100 Mc/s in so far as is practicable by adjustment of radiated power (provided the authorized transmitter power is not exceeded), by adjustment of antenna height (within the physical limitations approved by the Commission with respect to air navigation), or by employing appropriate antenna directivity. Appropriate remedial action in this respect may be specifically required of particular station licensees when, in the discretion of the Commission, such requirement must be imposed by a specific directive.

(c) Coast stations which transmit on a radio-channel above 100 Mc/s and are located within interference range on such channel of any station within a foreign country bordering on the United States, shall take such measures of the nature prescribed in paragraphs (a) and (b) of this section as may be practicable and appropriate to minimize interference to the involved foreign station(s), and shall keep the Commission fully informed of all pertinent developments.