1、C THIS DOCUMENT CONTAINS PAGES. MIL-A-28877 57 B 777770b 0054188 O 5 - 74- Q? MIL-A-28897( EC) 15 November 1985 MILITARY SPECIFICATION AMPLIFIER, RADIO FREQUENCY, AM-7074/BRC This specification is approved for use by the Space and Naval Warfare Systems Comand, Department of the Navy, and is availabl
2、e for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 SCO e. This specification covers manufacture and acceptance requirements for Radio Frequency distribut ion is un1 imited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS
3、-,-,-rlIL-A-28897( EC) DWGs NUSC NUSC/NLL 02379005 Pin Contact NUSC/NLL 02380006 Amplifier/Adapter Assembly Procedure NUSC/NLL 02383001 NUSC/NLL 02384001 Adapter, Connector (Pin Contact) Adapter, Connector (Socket Contact) (Copies of specif cat ions, standards, handbooks, DWGs, and other Government
4、documents required by contracbrs in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) The following documents form a part of this specification to the extent specified herein. Unless otherwise specified, the i
5、ssues of the documents which are DoD adopted shall be those listed in the issue of the DoDISS specified in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoOISS shall be the issue of the nongovernment documents which is current on the date of the sol citation
6、. 2.2 Other publications. DWGs SPEARS ASSOCIATES, INCORPORATED (SAI) SAI C185050 Liner SAI 0185049 Housing Assembly SAI E185033 Connector Plug, Electrical (Socket Contact) Cable Assembly R.F. SAI E211024 Amplifier, R.F. AM 7074/BRC (Copies of DWGs required by contractors in connection with specific
7、acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) and the references cited herein (except for associated detail specifications, specification sheets, or MS standards), the text of this specification shall take precedence. Nothing in t
8、his specifica- tion, however, shall supersede applicable laws and regulations unless a specific exemption has been obtained. 2.3 Order of precedence. In the event of a conflict between the text of this specification 3. REQUIREMENTS 3.1 General. The RF amplifier shall be in accordance with MIL-E-1640
9、0 to the extent spec- 3.1.1 First article. When specified in the contract or purchase order, a sample shall be if ied herer subjected to first article inspection (see 4.3 and 6.3). 3.1.2 Description. The RF amplifier shall consist of the components specified in a through c: a. Housing Assembly: SAI
10、DWG D185049 b. Liner: SAI DWG C185050 c. Amplifier, R.F. AM-7074/BRC: SAI DW E211024 3.2 Characteristics. RF amplifier characteristics shall be as specified in 3.2.1 through 3.2.1 Performance. The RF amplifier shall interface with Antenna Element, AS-3435/BRC and RF Cable Assemblies, CG-3820/BRC, an
11、d CG-3819/BRC, and Antenna Transmission Line, AS-3437rBRC of Buoyant Cable Antenna Assembly, AS-3434(V)/BRC. The RF amp1 if er shall permit passive receptior! of RF signals over the very low frequency (VLF) and low frequency (LF) range and amplified recep- tion of signals over the medium frequency (
12、MF) and high frequency (HF) and very high frequency (VHF) and ultra high frequency (UHF) ranges. with deployment and retrieval through Antenna Transfer Assembl es, AN/BRA-18( ) and AN/BKA-24( ). 3.2.3.5. The RF amplifier shall be mechanically compatible 2 F- A Provided by IHSNot for ResaleNo reprodu
13、ction or networking permitted without license from IHS-,-,-MIL-A-28877 57 m 7779906 0054390 9 m Frequency range (kHz) 10 to 50 70 to 100 (100) 100 to 130 130 to 150. 150 to 160 50 to 70 3.2.1.1 osc i 11 at ions. Buoyant Cab 1 e TABLE I. 3.2.1.2 Amp1 itude variation (dB) 13.0 IO. 75 10.4 0.0 (referen
14、ce) I4 *o. 75 I1.0 MF-UHF stability. The RF amplifier shall exhibit no internally generated parasitic Antenna Assembly, AS-3434(V)5/BRC floating in a straight 1 ne in sea water. The same stability shall be exhibited when the amplifier is configured as part of a MF-UHF voltage gain. The RF amplifier
15、shall conform to the gain limits specified in TABLE I. Gain requirements. i/ Frequency MHz - Voltage gain dB - 21 13 dB - i/ Megahertz 2/ Decibels - 3.2.1.3 MF-UHF loop gaih. The loop gain at all frequencies between 0.3 MHz and 1250 MHz, where the amplifier produces positive gain, shall be no greate
16、r than -20 dB. 3.2.1.4 MF-UHF noise figure. The RF amplifier shall exhibit a noise figure no greater than 7 dB at all frequencies from 2 MHz to 400 MHz. 3.2.1.5 VLF and LF sensitivity. When tested in accordance with 4.5.8, the RF amplifier shall reduce the sensitivity by less than 2 dB at all freque
17、ncies from 10 kilohertz (kHz) to 100 kHz. least mean square fit, straight line, drawn through the phase response plot over the frequency range 70 kHz to 130 kHz intercepts the phase shift axis within the interval O 125 degrees. the plot, the ordinate scale (phase shift) and the abscissa scale (frequ
18、ency) shall both be linear. The deviation of the phase response from the least mean square fit line shall be less than 1 degree over the 70 kHz to 130 kHz frequency range and less than 3 degrees over the 50 kHz to 150 kHz frequency range. 3.2.1.6 -. The phase response of the RF amplifier shall be su
19、ch thata For 3.2.1.7 VLF and LF amplitude response. The amplitude response of the RF amplifier shall rThe maximum allowable loss at 10 kHz and at 100 kHz conform to the requirements of TABLE II. shall be 2 dB.) 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license fr
20、om IHS-,-,- _ - MIL-A-28877 57 W 9979906 005LiL91 O 9 3.2.3.5 Tensile strength. When tested in accordance with 4.5.16, the RF ampl ifier assembled with suitable test cables shall withstand a static tensile load along its axis with no evidence of cracking or other damage. The elongation of the housin
21、g shall be less than 1.6 percent. 3.3 Design and construction. SAI OWG E211024 shall be used as a guide to achieving the func- I tional performance specified herein. The RF amplifier section shall be assembled in a housing fabricated in accordance with SAI DWG D185049. 3.3.1 Electrical design. The p
22、olarity and grounding of circuits shall be as specified to ensure compatibility with couplers and to minimize electrolysis of exposed antenna components. The RF amplifier shall be designed to operate from a constant voltage source of 27 volts direct current (VDC) connected with the positive side to
23、the center conductor and the negative side to the outer conductor of RF Cable Assembly, CG-3819/BRC, with which it interfaces. The current drawn by the RF ampl if er shall be less than 100 mi 11 iamperes (mA) I10 mA. The output of the RF ampl if er shall be connected between the center conductor and
24、 the outer conductor of the RF cable assembly with which it MIL-A-28897( EC ) 3.2.1.8 LF phase delay variation. The maximum and root-mean-square (rms) phase delay variations from the input to the output of the RF amplifier shall be no greater than 45 nano- seconds (ns) and 15 ns, respectively, in a
25、100-hour period over the frequency range 50 kHz to 160 kHz. Demonstration shall be by test in accordance with 4.5.11. 3.2.1.9 HF and UHF intermodulation products. The RF amplifier shall exhibit a level of intermodulation products at the output no qreater than -30 decibels referred to one milliwatt (
26、dBm) . 3.2.1.10 HF and UHF gain compression. When tested in accordance with 4.5.5, the RF amplifier shall exhibit an output level of at least +8 dBm for a gain compression of 1 d8. 3.2.1.11 Power supply interruption resistance. The amplifier shall operate satisfactorily after being subjected to the
27、direct current (DC) power on-off and short circuit cycles of 4.5.18. I 3.2.2 Physical characteristics. RF amplifier physical characteristics shall be as specified in 3.2.2.1 through 3.2.2.2. I 3.2.2.1 Weight and dimensions. The amplifier section shall fit the housing assembly shown in SAI DWG D18504
28、9 and shall provide the connector interfaces shown in SAI DWG E211024. The maximum length of the housing assembly shall be 8.25 inches (in.). The liner specified in SAI DWG C185050 is an integral part of the RF amplifier. The weight of the amplifier section including chassis and connector shall not
29、exceed 110 grams. 3.2.2.1.1 Diameter. The diameter of the anplifier housing shall be 0.650 in. 10.02 in. 3.2.2.2 Health and safety. Health and safety considerations require avoidance of toxi- cological substance such as encapsulants, adhesives, or preservatives which could contaminate the closed env
30、ironment of a submarine. The materials specified in SAI DWGs 0185049 and E211024 shall be acceptable. Any substitutes shall be approved by the Government. 3.2.3 Environmental conditions. Environmental conditions shall be as specified in 3.2.3.1 through 3.2.3.5. 3.2.3.1 Temperature. 3.2.3.2 Pressure
31、resistance. When tested in accordance with 4.5.14, the RF amplifier assembly The amplif er shall operate over the temperature range of -10 Celsius (C) to +50C and shall withstand shipment and storage over the temperature range -4OC to +70C. shall show no sign of damage and show no evidence of floodi
32、ng and exhibit no electrical degrada- tion. 3.2.3.3 Flexibility. When tested in accordance with 4.5.1, the RF amplifier shall exhibit I no physical damage as revealed by surface examination and pressure resistance tests, and no elec- tr cal degradat ion. I- I Provided by IHSNot for ResaleNo reproduc
33、tion or networking permitted without license from IHS-,-,-MIL-A-297 59 m 7997906 0054192 2 m M I L -A-28897 ( EC ) 3.3.2 Materials and parts. Materials and parts shall be in accordance with MIL-E-16400. Materials and parts listed on the DWGs are approved for the application shown. specifications for
34、 the connectors and housing of the RF amplifier shall be followed for form and fit in order to assure interchangeability. dimensions, and surface finishes specified. Correct arrangement, hookup, and fastening of all components during fabrication shall be assured. The molding procedure for the housin
35、g is particularly critical and shall be performed with careful attention to spacing, lay, and tension of reinforcing members. cuts, and gouges. The DWGs and 3.4 Workmanship. The RF amplifier shall be manufactured with care using the materials, The completed RF amplifier shall be clean and free of sa
36、nd, grit, burrs, 3.4.1 Workmanship screen. The RF amp1 if er shall withstand a defect detect ion vibration 2 screen of random type vibration at 0.049 /Hz I3 dB from 80 Hz to 350 Hz, and temperature cycling as specified in 4.6.1.2. 4. QUALITY ASSURANCE PKOVISIONS 4.1 Responsibility for inspection. Un
37、less otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as spec- if ied herein. use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by
38、 the Government. perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.1.1 Responsibility for compliance. All items shall conform to all requirements of Sec- tion 3 and Section 5
39、. The inspection set forth in this specification shall become a part of the contractors overall inspection system or quality program. The absence of any inspection require- ments in the specification shall not relieve the contractor of the responsibility of assuring that all products or supplies sub
40、mitted to the Government for acceptance comply with all requirements of the contract. Sampling in quality conformance does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to acceptance of defective mater al. Except as otherwise spec
41、ified in the contract or purchase order, the contractor may The Government reserves the right to 4.1.2 Government verification. All quality assurance operations performed by the contractor will be subject to Government verification at any time. Verification will connsist of, but is not limited to, a
42、) surveillance of the operations to determine that practices, methods, and procedures of the written quality program are being properly applied, b) Government product inspect ion to measure quality of the product to be offered for acceptance, and c) Government inspection of delivered products to ass
43、ure compliance with all inspection requirements of this specification. Failure of the contractor to promptly correct deficiencies discovered by him or of which he is noti- fied shall be cause for suspension of acceptance until corrective action has been taken or until conformance of the product to p
44、rescribed criteria has been demonstrated. 4.1.3 Quality assurance terms and definitions. Quality assurance terms used in this spec- ification shall be as defined in MIL-STD-109. 4.2 Classification of inspection. The inspection requirements specified herein are classified as specified in a through c:
45、 a. First article inspection (see 4.3) b. Qual ity assurance inspect ion: 1. Production inspection (Group A) (see 4.4.1) . 2. Production control inspection (Group B) (see 4.4.2) Inspection of preparation for delivery (see 4.7) c. 4.3 First article inspection. Unless otherwise specified (see 6.2.1),
46、one unit shall be required for first article inspection. First article inspection shall consist of all examination and testing necessary to determine compliance with the requirements of this specification. First article inspection shall include the tests specified in TABLE III. 4.4 Qual ity conforma
47、nce inspect ion. Qual ity conformance inspect ion shall be as spec if ied in 4.4.1 through 4.4.2.2. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - - _- MIL-A-28897 59 m 9999906 0054193 4 m MIL-A-28897( EC) 4.4.1 Product ion inspect ion (Group A
48、). Product ion inspect ion shall be conducted on each RF amplifier offered for delivery. Production inspection shall comprise such examinations and tests which will prove the workmanship and reveal omissions and errors of the production process such as functional and performance tests at a limited n
49、umber of points in the required range, tests which detect deviations from design, and tests which detect hidden defects of materials. inspection shall include the examinations and tests specified in TABLE III, Group A. If more than three units per 50 units tested fail the production inspection specified in 4.4.1, the contractor shall inmediately investigate the cause of failure to determine if the redesign permitted in 3.2.2.1 has affected reliability (see
