1、MILITARY SPECIFICATION FIELD CHANGE KIT FOR VARIABLE OUTPUT POWER CAPABILITY FOR TRANSMITTER AN/URT-23(C) 1 1 i MIL-F -28874( EC ) . / 27 May 1983 - c 3 *.- This specification is approved for use by the Naval Electronic Systems Command, Department of the Navy, and is available for use by all Departm
2、ents and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the requirements for the development and fabrication of a field change kit to the AN/URT-23(C) Transmitter (hereinafter referred to as the transmitter). The purpose of the field change kit is to permit the
3、transmitter average power and peak envelope power (PEP) output level to be adjustable from 10 milliwatts (mW) to 1000 watts (W) (nominal). 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbook. Unless otherwise specified, the following specifications, standa
4、rds, and handbook of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DoDISS) specified in the solicitation form a part of this specification to the extent specified herein. SPECIFICATIONS MILITARY MIL-S-901 MIL-E-16400 MIL-W-16878 MIL-E-17555 MIL-F-
5、17655 MIL-T-28706 MIL-P-55110 STANDARDS MILITARY MI L-STD- 109 MI L-STD- 167- 1 MI L-STD-275 MI L-STD-461 MI L-STD-462 MIL-STD-965 Shock Test, H.I. (High-Impact); Shipboard Machinery, Equipment And Systems, Requirements For Electronic, Interior Communication And Naviga- tion Equipment, Naval Ship An
6、d Shore: General Speci fi c at i on For Wire, Electrical y Insulated, General Specifica- tion For Electronic And Electrical Equipment, Accessories, And Repair Parts; Packaging and Packing Of Field Changes And Field Change Kits; General Specification For Transmitter, Radio AN/URT-23(V) Printed Wiring
7、 Boards Quality Assurance Terms and Definitions Mechanical Vibrations Of Shipboard Equipment (Type I - Environmental And Type II - Internally Excited) Printed Wiring For Electronic Equipment Electromagnetic Emission And Susceptibility Requirements For The Control Of Electromagnetic Interference El-e
8、ctromagnet i c Interference Char acteri stics, Measurement Of Parts Control Program - - _ Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Command (ELEX-8111), Washington, DC 20363, by using the
9、self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document, or by letter. Commander, Naval Electronic Systems FSC 5820 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-F-28B74 58 m 7999906 04
10、51677 1 M b MIL-F-28874(EC) C HANDBOOK MILITARY MIL-HDBK-251 Reli abi li ty/Design Thermal Applications 2.1.2 Other Government publication. PUBLICATION The following other Government publication forms a part of this specification to the extent specified herein. MILITARY NAVAL SEA SYSTEMS COMMAND Shi
11、p alteration (Shipalt) SHIPALT Installation Instruction For SSBN 1152(K) PKG-F/A (Copi es of speci f ications, standards, handbook, and publication required by manufacturers in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contr
12、acting officer.) cation and the references cited herein, the text of this specification shaH take precedence. 2.1.3 Order of precedence, In the event of a conflict between the text of this specifi- I 3. REQUIREMENTS 3.1 General. The field change kits shall be in accordance with MIL-E-16400 and Type
13、I of MIL-F-1765me extent specif i ed herein. 3.1.1 First artide. When specified, a sample shall be subjected to first article inspec- tion (see 4.3 and 6.3). and electrical form, design! performance, and ease of installation, final mechanical and electrical form, shall employ standard or nonstandard
14、 (when approved by the procuring activity) parts, and be completely representative of the final field change kit. ance with MIL-E-16400, except as otherwise specified in 3.1.2.1 through 3.1.2.4. attention shall be given to the acceptable and unacceptable materi als of MIL-E-16400. coating of printed
15、 wiring boards is not required. control led in accordance with MIL-STD-965, Procedure I. standard parts. employ standard parts or approved nonstandard parts. Nonstandard parts approvals granted under earlier contracts for equipments represented by the GFE shall not be construed as being extended to
16、field change kits furnished in accordance with this specification. parts cited in Government-furnished drawings shall not be construed as being approved for use in field change kits furnished in accordance with this specification. the selection of individual parts, unless such selection is specifica
17、lly approved by the procuring activity. shall be included in all applicable technical publications and engineering drawings to enable designated repair activities to make such selection. The sample(s) shall be suitable for complete evaluation of mechanical The sample(s) shall be of 3.1.2 Parts, mate
18、rials, and processes. Parts, materials, and processes shall be in accord- Particular Conformal 3.1.2.1 Parts control. The parts to be incorporated in the field change kit shall be I 3.1.2.2 Prior parts approval. Government-furnished equipment (GFE) may include non- Field change kits furnished in acc
19、ordance with this specification shall Nonstandard 3.1.2.3 Individual selection. Field change kit performance shall not be dependent on If such individual part selection is approved, sufficient information 3.1.2.4 Semiconductor devices. All semiconductor devices shall be made of silicon. 3.1.3 Interf
20、ace requirements. The modification specified herein shall provide extended variable output capability as a supplement to the present normal modes of transmitter operation without degrading present normal mode performance. this modification shall interface mechanically and electrically with the requi
21、rements specified in a and b: clature of the T-827( )/URT to T-l095/URT, and In addition, the installed hardware for a. Hardware installed by Shipalt SSBN 1152(K) PKG;F/A, which changes the nomen- 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-b.
22、Hardware installed to adapt the transmitter to operate in the Naval Tactical Data System (LINK-11). 3.2 Government-furnished material (GFM). GFM, if any, shall be as specified (see 6.2). 3.3 Field change kits. 3.4. Operating power requirements. Field change kits shall be designed and fabricated in a
23、ccordance with MIL-F-17655, in the quantities specified in the contract (see 6.2). from alternating current voltage within the transmitter. may or may not derive their direct current power from existing power supplies within the trans- mi tter. 3.4.1 Transient operation. The field change kit shall c
24、onform to the performance limits of operation under the conditions of transient voltage and transient frequency as specified in MIL-E-16400 for shipboard equipment, to the extent that performance of the GFE is not degraded. All operating primary power requirements shall be derived The installed unit
25、s and piece parts mit in 3.5 Environmental service conditions. When the field change kit is installed, the trans- .ter shall be capab?e of continuous, reliable operation, within the performance limits specified a through e, under those environmental conditions of MIL-E-16400 specified herein. The tr
26、ans- mitter shall operate within tolerances throughout the corresponding tests specified in Section 4 without alignment or adjustment, other than external controls normally employed for operation of the equipment. a. b. c. d. Shock e. Vibration Operating temperature range (Range 4) Nonoperating temp
27、erature range (Range 4) Humidity (O percent to 95 percent) 3.6 Mechanical design and consb-uction. Mechanical design and construction shall conform to all applicable requirements of MIL-E-16400, to the extent of being compatible with the GFE transmitter. 3.6.1 Accessibility. boards, components, test
28、 points, and maintenance adjustment components shall have maximum accessibility for maintenance, repair, or repl-acement. maintenance accessibility shall not be degraded, relative to the GFE, adjustable components shall be accessible without removing dust covers or other components. In addition to t
29、he requirements of MIL-E-16400, circuit mounting For modifications to existing assemblies, In new assemblies, all 3.6.2 Test rovisions. A sufficient quantity of test points shall be provided and located to permit the -$- SO ation of malfunctioning parts or subassemblies within any assembly, without
30、removing the printed circuit board from its connector or unsoldering any interconnection or wiring lead. The design of the field change kits shall not include factory or sealed adjustment controls, unless specifically approved by the procuring activity. Where these controls are approved, a complete
31、description and instructions for adjustment of the controls shall be included in the associated technicd publications. 3.6.3 Factory adjustment controls. 3.6.4 Shock and vibration. 3.6.4.1 Shock. The transmitter, with the field change kit installed, shall be capable of withstanding the shock test fo
32、r Grade A, deck-mounted, Class II, lightweight and medium weight, as required, Type A equipment as specified in MIL-S-901. of withstanding the Type I vibration test of MIL-STD-167-1. and assembies thereon shall conform to the requirements of MIL-E-16400, interfaci al (feed-through) connections on ne
33、wly-designed double-sided boards chal 1 be made by plated-through holes complying with the requirements of MIL-STD-275. Contractor certification requirements of MIL-P-55110 do not apply. 3.6.4.2 Vibration. 3.6.5 Printed wiring. The transmitter, with the field change kit installed, shall be capable T
34、he fabrication of printed wiring boards and the insertion of parts All printed wiring 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-9 MIL-F-2887LI 58 777770b OL1CLb77 5 W b MI L-F -28874 (EC ) . 3.6.6 Soldering. Soldering shall conform to the req
35、uirements of MIL-E-16400. 3.6.7 Attachment of wires and leads. Attachment of wires and leads shall conform to the 3.6.8 Internal wiring and cabling. requirements of MIL-E-16400. requirements of MIL-E-16400. wire shall conform to MIL-W-16878, Type E. 3.6.9 Conductor identification. ments of MIL-E-164
36、00. field change kit. Internal wiring and cabling shall conform to the All wiring shall be polytetraf luoroethylene insulated. Hook-up Identification of conductors shall conform to the require- The method used for identification shall be consistent throughout the 3.6.10 Part replacement. 3.6.11 Ther
37、mal design. Part replacement shall conform to the requirements of MIL-E-16400, Thermal design shall be in accordance with MIL-E-16400 to the extent A thermal survey of the field change kit modifications shall be of compatibility with the GFE. performed. indicators, and their arrangement on the front
38、 panel of the radio frequency (RF) amplifier shall be in accordance with MIL-E-16400. 3.7 Detailed performance. specified herein without degradation of any other parameters specified in MIL-T-28706, or without degrading the performance of the GFE. transmitter output power levels. approximately 100 W
39、 to 1000 W. with this specificaton will permit the transmitter output power to be varied continuously from 10 mW to 1000 W. The field change kit will also provide the capabiJity to measure the forward and reflected output power over the extended range. All capabilities shall be provided within the e
40、xisting form factor of the AM-3924( )/URT amplifier (see MIL-T-28706). added power control circuitry shall preserve the ampli tude relationships between continuous wave (CW), amplitude modulation (AM) carrier, and two-tone outputs in existing transmitters. MIL-HDBK-251 hay be used as a guide. 3.6.12
41、 Controls, indicators, and panel layout. The design of field change kit controls, The modified transmitter shall conform to the requirements 3.7.1 General. The purpose of the field change kit is to extend the range of existing The present design permits varying the output power from Incorporation of
42、 the field change kit developed in accordance Operation of the 3.7.2 Power output. 3.7.2.1 Maximum output kvels. The modified transmitter shall be capable of transmitting the power outputs specified in TABLE I into a 50-ohm resistive load on a continuously keyed basis throughout the 2 megahertz (MHz
43、) to 30 MHz frequency range. limits are based on setting the power amplifier front panel power kvel control for maximum output, and inserting standard two-tone audio inputs to the T-827( )/URT radio transmitter (see MIL-T-28706) in the single sideband (SSB), independent sideband, and compatible AM m
44、odes. In a transmitter equipped with the LINK-11 data modification., the audio input shall be the NET TEST signal at zero decibels referred to one milliwatt (dem) average power and a PEP or average ratio of 8.6 decibels (dB) in each sideband. amplifier front panel shall permit the continuous adjustm
45、ents of the output power to any desired level between 10 mWSPEP, or average, and the full output levels of TABLE I, using multiple (coaxial) controls on a concentric shaft which replaces the existing control, shall provide both power control and appropriate power monitor switching by suitable contro
46、l and metering element ganging. single (coaxial) concentric control shall function to control power in all modes. All other power controls, and their panel legends, shall be removed. exceed a total of 1 dB over the O Cekius (C) to 50C operating range for nominal power outputs of 100 W to WOO W (maxi
47、mum clockwise position of power control selector switch). For power settings of less than 100 W, variation shalJ not exceed 11 dB (2 dB total) for the same temperature operating range. The output level variation 3.7.2.2 Power output range. A power output level control located on the AM-3924( )/URT T
48、he new control For either normal or LINK-11 modified transmitters, only a 3.7.2.3 Power output variation with temperature. Variation in power output shall not 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-28874( EC ) TABLE I. Power output.
49、Emi ssi on Al, F2j A3h A3a, A3j, A9b A3b F9 (TADIL continuous control, including power setting overlap when range switching, shall be verified. Measurements shall be performed at the center of each AM-3924( )/URT amplifier frequency band, and in the Al, A3h (carrier only), A3j (standard two-tone modulation), F9j, and F9 modes. ments in the F9j and F9 modes shall be with the NET TEST modulation signal. Measure- 4.7.1.2 Power control distortion. Measurements shall be made to verify complianc
