technical requirements, notice may be given directly by the Chief, Laboratory Division, and arrangements made for modification or adjustment as required. §2.563 Limitations on type approval.

(a) Type approval is limited to a determination that, if the equipment is properly maintained and operated and no unauthorized change whatsoever is made in its construction, it is capable of complying with the technical requirements of the applicable part of the rules. Type approval shall not be construed as a determination with respect to features not covered by the rules of the service under which the equipment is approved.

(b) Type approval shall not be construed to mean that the equipment will continue to be satisfactory as the Commission's technical standards may be changed to conform with progress in the state of the art.

$2.565 Withdrawal or refusal of type approval.

(a) Type approval may be withdrawn, if upon subsequent inspection or operation it is determined that the manufacturer has made unauthorized changes in the equipment or that the equipment does not comply with the technical requirements of the applicable part of the rules. The procedure for withdrawal of type approval in such cases shall be the same as that prescribed by the Commission for revocation of a radio station license pursuant to the provisions of the Communications Act of 1934, as amended.

(b) In the event changes in the Commission's technical standards necessitate the withdrawal of type approval, the procedure to be followed will be set forth in the order finalizing the revised technical standards after appropriate rule making proceedings.

When type approval has been withdrawn, the manufacturer shall make no further sale of equipment which in any manner indicates that such equipment meets the type approval requirements of the Commission.

(d) When type approval has been withdrawn for unauthorized changes by the manufacturer, the Commission will cons.der that fact in determining whether the manufacturer in question is eurible to receive any new type approval.

e) Any person affected by a refusal to grant type approval may file a petition for reconsideration within 30 days after

written notice of such refusal has been issued, as provided in § 1.106 of this chapter.

§ 2.567

Identification and changes in type approved equipment.

(a) Each type of equipment for which type approval is requested shall be identified by a type number assigned by the manufacturer of the equipment. The type number shall consist of a series of not more than a total of seventeen digits, letters, punctuation marks, and spaces. The type number shall be shown on a name plate affixed in a conspicuous place to such equipment. All equipment used pursuant to type approval shall have affixed to it such indication of type approval as may be required in the service rules governing such equipment.

(b) No change whatsoever may be made in the design of type approved equipment without prior authorization from the Commission. When a change is requested, the Commission may authorize the change or require that the modified equipment be identified with a new type number and be resubmitted for type approval tests.

(c) If the assignment of a different type number is required as a result of equipment modification, a new name plate bearing the new type number shall be affixed to the modified equipment.

(d) Users of type approved equipment shall not modify their own equipment. TYPE ACCEPTANCE

§ 2.571 Type acceptance.

(a) Type acceptance of equipment is based on representations and test data submitted to the Commission by the manufacturer or prospective licensee. This information may be subject to check by Commission measurements.

(b) A separate request for type acceptance shall be submitted for each different type of equipment. Each request shall be signed by the applicant or by a duly authorized representative who shall certify that the application was prepared by him or at his direction and that to the best of his knowledge and belief the facts set forth in the application and accompanying technical data are true and correct. The technical test data required to be submitted shall be certified by the engineer who performed or supervised the tests who shall attach a brief statement of his qualifications.

(c) In the event there is no Commission action on an application for type acceptance within thirty (30) days after the application is filed, or within 30 days after the applicant has submitted additional data at the request of the Commission, the equipment will be deemed approved in accordance with the Commission's type acceptance procedure. The term Commission action as used in this section means either issuance of a public notice, a listing of the accepted equipment on the equipment list or sending a letter or post card to the applicant.

(d) Notice to applicant of type acceptance will be by post card and public notice will be given by listing the accepted equipment on the Commission's equipment list. Notice that an application has been found unacceptable for type acceptance will be by letter to the applicant.

[28 F.R. 12465, Nov. 22, 1963, as amended at 29 F.R. 10585, July 30, 1964]

§ 2.573 Limitation on type acceptance.

(a) Type acceptance is limited to a finding that, insofar as can be determined from the data submitted, and if the equipment is properly maintained and operated and no change is made in its construction, except as provided for in § 2.584, the equipment complies with current technical standards of the service in which the equipment will be operated. The fact that a particular equipment has been type accepted for licensing purposes shall not be construed as a determination with respect to mechanical features, nor of reliability under service conditions, except as provided for in the rules of the service under which the equipment is accepted.

(b) Type acceptance shall not be construed to mean that the equipment will continue to be satisfactory as the Commission's technical standards may be changed to conform with progress in the state of the art.

§ 2.575 Withdrawal or refusal of type

acceptance.

(a) Type acceptance may be withdrawn, if upon subsequent inspection or operation it is determined that the manufacturer has made changes in the equipment other than as provided for in 2.584, or that the equipment does not comply with the technical requirements of the applicable part of the

rules. The procedure for withdrawal of type acceptance shall be the same as that prescribed by the Commission for revocation of a radio station license pursuant to the provisions of the Communications Act of 1934, as amended.

(b) In the event changes in the Commission's technical standards necessitate the withdrawal of type acceptance, the procedure to be followed will be set forth in the order finalizing the revised technical standards after appropriate rule making proceedings.

(c) When type acceptance has been withdrawn, the manufacturer shall make no further sale of equipment which in any manner indicates that such equipment meets the type acceptance requirements of the Commission.

(d) When type acceptance has been withdrawn for changes made by the manufacturer where such changes are not in accordance with the provisions of § 2.584, the Commission will consider that fact in determining whether the manufacturer in question is eligible to receive any new type acceptance.

(e) Any person affected by a refusal to grant type acceptance may file a petition for reconsideration within 30 days after written notice of such refusal has been issued, as provided in § 1.106 of this chapter.

§ 2.577 General information required for type acceptance.

(a) Each request for type acceptance of equipment shall include the information listed in paragraph (b) of this section and in §§ 2.579 and 2.582. This information is general and is the minimum required for all equipments. In many cases, additional information specific to a particular service is also required. The applicant should carefully read the rules of the service in which the proposed equipment is intended to be operated to make sure that such additional specific information is furnished. If deemed necessary, the Commission may require additional information, test data, or testing in its own. Laboratory at Laurel, Maryland, before determining the acceptability of any specific equipment.

(b) The request shall include the following information insofar as it is applicable to the equipment:

(1) The type number of the equipment in accordance with § 2.584.

(2) The service and rule part under which the equipment is intended to be operated.

(3) Description of equipment: The description of equipment should include the type of emission, frequency range, power rating as defined in the applicable part of the rules, voltages applied to and currents into the several elements of the final amplifier tube or tubes for normal operation, function of each tube, circuit diagrams, instruction books when available, tune-up procedure, a description of the oscillator circuit and any devices installed for the purpose of frequency stabilization. When circuits or devices are employed for limiting modulation or suppression of spurious radiation a description of these should be included. The description should be sufficiently complete to develop all factors that may affect a determination as to whether the equipment will comply with the technical standards of the applicable rule parts.

(4) Photographs of equipment: Adequately identified photographs of sufficient size and clarity to reveal equipment construction and layout should be furnished. These should include at least one view showing the control panel or panels, including meters and labels for controls and meters, and sufficient views of the internal construction to define component placement and chassis assembly. Insofar as these requirements are met by photographs or drawings contained in instruction manuals supplied with the type acceptance request, additional photographs need be sufficient only to complete the required showing. $2.579 Measurement data required for type acceptance.

Measurements shall be made to estabAsh the following:

(a) Radio frequency power output at the RF output terminals when the transmitter is adjusted in accordance with the tune-up procedure to give the values of current and voltage on the circuit elements specified in § 2.577(b) (3). Give details of the radio frequency load attached to the output terminals when this test is made.

(b) Modulation characteristics: (1) Voce modulated communications equipRent: A curve or equivalent data show

the frequency response of the audio modulating circuit over a frequency range of 100 to 5000 cycles shall be submitted.

(2) Other types of equipment: A curve or equivalent data will be submitted which shows that the equipment will meet the modulation requirements of the rules under which the equipment is to be licensed.

(3) Equipment which employs modulation limiting: If a modulation limiting device or circuit is incorporated in the equipment a curve showing the percentage of modulation versus the modulation input voltage shall be supplied.

(c) Bandwidth occupied: The frequency bandwidth such that, below its lower and above its upper frequency limits, the mean powers radiated are each equal to 0.5 percent of the total mean power radiated by a given emission; measured under the following conditions as applicable:

(1) Telegraph transmitters for manual operation-when keyed at 16 dots per second.

(2) Other keyed transmitters-when keyed at the maximum machine speed.

(3) Voice modulated transmitters equipped with a device to prevent overmodulation-when modulated by an input signal 16 db greater than that required to produce 50 percent modulation: Test at 2500 cycles.

(4) Voice modulated transmitters without a device to prevent overmodulation-when modulated by an input signal large enough to produce at least 85 percent modulation: Test at 2500 cycles.

(5) Standard broadcast transmitters when modulated with a frequency of 7500 cycles at 85 percent modulation. FM broadcast transmitters, including TV aural transmitters-when modulated with a frequency of 15 kc/s at 85 percent modulation.

(6) Transmitters in which the modulating baseband comprises more than three independent channels-when modulated with a test signal consisting of a band of random noise extending continuously from below 20 kc/s to the highest frequency in the baseband. The level of the test signal shall be adjusted to provide RMS modulation which is 22.4 percent of the full rated peak modulation of the transmitter. The test signal shall be applied through any preemphasis networks used in normal service.

(7) Transmitters in which the modulating baseband comprises not more than three independent channels-when modulated by the full complement of

signals for which the transmitter is rated. The level of modulation for each channel should be set to that prescribed in rule parts applicable to the services for which the transmitter is intended. If specific modulation levels are not set forth in the rules, the test levels should provide the manufacturer's maximum rated condition.

(8) Transmitters designed for other types of modulation-when modulated by an appropriate signal of sufficient amplitude to be representative of the type of service in which used. A description of the input signal used should be supplied.

(d) Spurious emissions from the transmitting equipment for the following conditions:

(1) Radio frequency voltage measurements at the antenna terminals. The radio frequency voltages generated within the equipment and appearing on a spurious frequency shall be checked at the equipment output terminals when properly loaded with a suitable artificial antenna. Curves or equivalent data shall show the magnitude of each harmonic and other spurious emission that can be detected when the equipment is operated with a carrier modulated under the conditions specified in paragraph (c) of this section for determining the band width occupied. The amplitude of spurious emissions which are more than 20 db below the permissible value need not be shown.

(2) Field strength measurements of spurious radiations. A report of field strength measurements made to detect spurious emissions that may be radiated directly from the cabinet, control circuits, power leads, or intermediate circuit elements under normal conditions of installation and operation shall be made for the following equipments:

(i) Those in which the spurious emissions are required to be 60 db or more below the carrier level.

(ii) All equipment operating on frequencies higher than 25 Mc/s.

(iii) Hand carried transmitters, or others, where the antenna is an integral part of and attached directly to the transmitter.

(iv) Other types of equipment as required, when in the opinion of the Commission, there is need for such measurement.

(e) In all of the measurements set forth in paragraph (d) of this section, the spectrum should be investigated from the lowest radio frequency generated in the equipment up to at least the tenth harmonic of the carrier frequency or to the highest frequency possible in the present state of the art of measuring techniques. Particular attention should be paid to harmonics and subharmonics of the carrier frequency as well as to those frequencies removed from the carrier by multiples of the oscillator frequency. Radiation at the frequencies of multiplier stages should also be checked. The amplitude of spurious emissions which are more than 20 db below the permissible value need not be reported.

(f) Frequency stability: The frequency stability of transmitting equipment shall be checked with variations in:

(1) Temperature. Vary the ambient temperature from -30° to +50° Centigrade for non-broadcast equipment. Use suitable limits for broadcast equipment. Only the oscillator need be subjected to this test.

(2) Primary supply voltage. Vary the primary supply voltage from 85 percent to 115 percent of the normal supply voltage at the input to the cable normally provided with the equipment, or at the power supply terminals if cables are not normally provided. § 2.582

Measurement procedure for type acceptance.

(a) The Commission will accept data in full accordance with established standards and measurement procedures as published by engineering societies and associations such as the Electronic Industries Association, the Institute of Electrical and Electronics Engineers, Inc., and the American Standards Association. Specific reference should be made to the standards used. In lieu of such standards, the applicant will submit a description of each measurement procedure together with a listing of the actual test equipment used. The Commission will accept measurements made by a qualified engineer where the procedures employed are based upon sound engineering principles.

(b) For radio frequency equipment other than transmitters, appropriate tests and performance requirements may be specified in other parts of this chapter.

§2.584 Identification and changes in type accepted equipment.

(a) Each type of equipment for which type acceptance is requested shall be identified by a type number assigned by the manufacturer of the equipment. The type number shall consist of a series of not more than a total of seventeen digits, letters, punctuation marks, and spaces. The type number shall be shown on a name plate affixed in a conspicuous place to such equipment. All equipment used pursuant to type acceptance shall have affixed to it such indication of type acceptance as may be required in the service rules governing such equipment.

(b) Equipment of the same type is defined for the purposes of type acceptance as being equipment which is electrically and mechanically interchangeable. In addition, transmitters of the same type will have the same basic tube line up, frequency multiplication, basic oscillator circuit, basic modulator circuit, and maximum rated power input.

(c) Permissive changes may be made in type accepted equipment without prior Commission approval. There are two classifications of permissive changes, neither of which may involve change of type as defined in paragraph (b) of this section. The first classification includes those modifications in type accepted equipment which do not change the equipment characteristics beyond the rated limits established by the manufacturer and accepted by the Commission when obtaining type acceptance. The second classification of permissive changes includes those which bring the performance of the equipment outside the manufacturers' rated limits as origtally filed but not below the minimum requirements of the applicable rules. The Commission shall be supplied with comlete information and results of tests arding this class of permissive changes, in accordance with § 2.571 (b), Pr to the operation of the modified rpment under an authorization of the Commission.

(d) Changes in type accepted equipment, except permissive changes as set forth in paragraph (c) of this section, thall not be made except under prior auterization of the Commission. When rich a change is requested, the Commismon may authorize the change or require that the modified equipment be identifed with a new type number and that additional information be submitted

for further consideration as to type acceptance.

(e) If the assignment of a different type number is required as a result of equipment modification, a new name plate bearing the new type number shall be affixed to the modified equipment.

(f) Users shall not modify their own equipment except as provided in paragraphs (c) or (d) of this section, as applicable,

TECHNICAL INFORMATION FOR APPLICATION REFERENCE

§ 2.591

Submission of technical information for application reference.

(a) Applications for station authorizations in some services require a detailed technical description of the equipment proposed to be used. In order to simplify the preparation and processing of applications by eliminating the need for submission of equipment specifications with each application, the Commission will accept for application reference purposes detailed technical specifications of equipment designed for use in these services. Manufacturers desiring to avail themselves of this procedure should submit all information required by the application forms and the rules for the services in which the equipment is to be used. Applications for station authorizations submitted subsequent to such filing may refer to the technical information so filed.

(b) Receipt by the Commission of data for application reference purposes does not imply that the Commission has made or intends to make any finding regarding the acceptability of the equipment for licensing and such equipment will not be included on the list of equipment acceptable for licensing. Each applicant is expected to exercise appropriate care in the selection of equipment to insure that the unit selected will comply with the rules governing the service in which it is proposed to operate.