§ 91.552 Availability and use of service. (a) Except as provided in paragraph (e) of this section, the Business Radio Service is available to the extent indicated in the eligibility provisions of this subpart and is intended for use by those who are eligible without restriction as to the types of messages transmitted as long as they are necessary to the accomplishment of the business activity concerned: Provided, however, That all stations licensed in this service must accord first priority for the use of the frequency concerned to any station transmitting communications resulting from an actual emergency involving immediate danger to life or property.

(b) Each application for an authorization in the Business Radio Service shall be complete in itself including any necessary showings or attachments and without cross reference to information previously filed. Applications for modification of an existing station must show in precise detail all particulars of the desired operation; repeating in exact accordance those particulars of the outstanding authorization not being affected by the modification and including new entries in the appropriate items to reflect the changes desired.

(c) Pursuant to the provisions of § 91.8, frequencies authorized to stations in the Business Radio Service can be used only on a shared and cooperative basis. Any licensee in this service must expect operations in the same area by other licensees on the same frequency. and must cooperate fully in the joint use of the assigned frequency. In areas of extreme frequency congestion, the Commission may require monitoring of the assigned frequency before transmitting.

(d) In any area where the shared use of frequencies in the Business Radio Service results in an uneven distribution of the total communications load between the available frequencies, the Commission will consider applications for appropriate frequency change.

(e) Commencing November 22, 1965, applications for authorizations to construct new microwave point-to-point radio stations for relaying television, standard, or FM broadcast signals to community antenna television (CATV) systems, will not be accepted for filing in the Business Radio Service. Existing sys

tems may be continued to be authorized until not later than February 1, 1976, or until an earlier date if the Commission determines that the frequencies in the 12,200-12,700 MHz band are needed for operational fixed stations in the Safety and Special Radio Services, subject to the following:

(1) No additional stations or frequencies will be authorized in this service:

(2) Replacement of equipment may be authorized only if the new equipment can be modified easily for operation in the 12,700-12,950 MHz band;

(3) Authorizations and renewals thereof may be granted for a term not exceeding 1 year.

(f) Stations authorized to operate on the frequencies designed for use pursuant to § 91.554(b) (36) may employ signal boosters on base station frequencies subject to the following conditions:

(1) The amplified signal is retransmitted only on the exact frequency of the originating base station.

(2) The booster is equipped with automatic gain control circuitry which will limit the total output of the booster to 500 milliwatts under all conditions.

(3) All such devices are installed with sufficient isolation between receiving and retransmitting circuits to prevent oscillation.

(4) The power of any emission, except on frequencies within the 460.6375460.8875 MHz band or on which there is an input signal to the booster, shall be attenuated at least 35 decibels below the total power output of the booster.

(5) In the event control of the booster is impaired due to its activation by signals other than those intended by the licensee to be retransmitted, the licensee shall provide the booster with means of control such that it will be activated only by signals intended to be retransmitted, and boosters so provided with such means of control shall also be provided with an automatic time-delay or clock device which will deactivate the booster not more than three minutes after its activation.

(g) If signal boosters are to be used in conjunction with other facilities, the number of such boosters must be stated on the license application.

[28 FR. 14147, Dec. 21, 1963, as amended at 30 F.R. 13375, Oct. 21, 1965; 35 F.R. 19020, Dec. 16, 1970; 36 F.R. 7431, Apr. 20, 1971]

(a) Mobile relay stations will not be authorized in the Business Radio Service within the continental limits of the United States, except when (1) such stations and all associated control and mobile stations are to be operated exclusively on frequencies above 450 MHz, or (2) when such stations and all associated control and mobile stations are to be operated on frequencies designated for low power operation and are limited to a maximum plate input power of 1 watt with the mobile relay antenna system no more than 40 feet above the ground.

(b) [Reserved]

(c) Base or mobile stations being

utilized in itinerant operations at various temporary locations and not associated with a permanent service area will be authorized only on frequencies indicated for itinerant use or for general use.

[28 F.R. 14147, Dec. 21, 1963, as amended at 29 F.R. 226, Dec. 23. 1964; 33 F.R. 5876, Apr. 17, 1968; 35 F.R. 12397, Aug. 4, 1970] § 91.554 Frequencies available.

(a) The following tabulation indicates the frequencies or bands of frequencies available for assignment to stations in the Business Radio Service together with the class of station(s) to which they are normally assigned, a general reference terminology and the specific assignment limitations, which are developed in paragraph (b) of this section: