1、MIL-L-18270 (*ER) 15 DECEMBER 1954 Supersedes 16L5(Aer) Dtd 1 December 1947 MILITARY SPECIFICATION LOAD, DUMMY, TS-338(*)/UP This specification has been approved by the Bureau of Aeronautics, Department of the Navy. 1. SCOPE AND CLA General Speci- f ication Packaging and Packing of Electrical Equipm
2、ent and Spare Parts (Electronic, Electrical, and Electromechanical) Bureau of Aeronautics SR- 197 Nomenclature and Nameplates for .Electronic and Associated Equipment 2.3 Standards, MIL-STD- 129 Marking for Shipment and Stowage 2.4 DrawinPs Bureau of Ships RE49F211 Coupling F .- 1 THIS WCU however,
3、if the contractor can demonstrate that the use of such parts and materials will not fulfill the major design objectives, then parts and materiais shall be used which rhost nearly meet or exceed the requirements of Specification MIL-T-945. (3) Approval on Nonstandard Parts and Materials - Approval fo
4、r the use of nonstandard parts and materials shall be obtained as outlined in Specification MIL-T-945. Requests for approval must be forwarded to the procuring agency by the contractor before parts are purchased or fabricated, Provided by IHSNot for ResaleNo reproduction or networking permitted with
5、out license from IHS-,-,-MIL-L-L270 66 9799906 OL29b8l 9 w MIL- L- 18270(Aer) (4) Workmanship - Workmanship, fabrication, and manufacturing processes shall conform to the requirements of Specification MIL- T-945. 3.2 General Design Requirements 3.2.1 General - The equipment shali fulfili all applica
6、ble design and perfocmance requirements of Spec- ification MIL- “-945 unless otherwise specified: 3.2.2 Form Factor and Weight - The equipment shall be built into a special waveguide casting closed at one end. The other end shall be terminated in a choke coupling designed for standard connection to
7、a UG-53/U flange coupling cover. The dimensions of the over-all equipment shall not be greater than 23 inches long, 6-7/8 inches wide and 5-1/2 inches thick. The weight shall not be greater than 25 pounds. 3.2.3 or reasonable combinations of service conditions, as specified in Specification MIL- T-9
8、45 except that the requirements specified shall apply only with the temperature range from -40“ to -1.55“ C. Service Conditions - The dummy load shall operate satisfactorily under any of the service conditions, 3.2.4 able servicing or replacement of parts. The life of such parts and parts requiring
9、replacement within this interval shall be specified by the manufacturer. 3.2.5 of parts and niaterials that are non-nutrient for fungus. The parts and materials shall be treated so that prior to their use in the equipment, over-all spraying of the equipment is not necessary, 3.2.6 Interchangeability
10、 - Mechanical and electrical interchangeability shall exist between similar assem- blies, subassemblies, and replaceable parts regardless of the manufacturer or supplier. Interchangeability for the purposes of this paragraph does not mean identity, but requires that a substitution of such like assem
11、- blies, subassemblies, and replaceable parts be easily effected without physical or electrical modifications to any part of the equipment. In the design of the equipment, provisions shall be made for design tolerance to accommodate various components having the limiting dimensions and characteristi
12、cs set forth in the speci- fications or the particular component involved without departure from the specified performance. 3.2.7 quirements of Specification SR- 197. 3.2.8 Performance 3.2.8.1 Voltage Standing Wave Ratio - The load alone shall have a voltage standing wave ratio of 1.10 or less and t
13、he combination of the load and adapter shall have a voltage standing wave ratio of 1.20 or less. 3.2.8.2 Receiver Power - The dummy load shall be capable of receiving and dissipating a maximum average power of at least 600 watts for a period of four hours without the use of forced draft ventilation
14、and maximum peak pulses of at least one megawatt. 3.2.8.3 3.2.9 3.3 Detail Design Requirements 3.3.1 Dummy Load TS-338(*)/UP - The dummy load shall be built into a special wave guide casting carry- ing a series of heat radiating fins. It shall be closed at one end, the other end terminating in a cho
15、ke coup- ling designed for standard connection to a UG-53/U flange coupling cover. Its dimensions shall not be greater than 19 inches long, 6- 7/8 inches wide, and 5- 1/2 inches deep. 3.3.2 Adapter CG-384/UP(4“) - One transmission line, CG-384/UP, shall be furnished as an adapter. This transmission
16、line shall be equivalent to a section of RG-48/U wave guide (BUSHIPS Dwg. No. RE49F211) ter- minated at each end in a UG-53/C flange (ASESA Dwg. No. AS-2000). Operating Life - The equipment shall have a minimum total operating life of 2UOO hours with reason- Fungus and Moisture Treatment - The equip
17、ment shall be moisture and fungus-proofed by selection Nameplates and Nomenclature - Nameplates and nomenclature shall be in accordance with the re- Frequencv .- - The equipment shall operate in the freqiiency range from 2500 to 3750 mc. Finish - The equipment shall be finished with a suitable heat-
18、resistant dull black paint. / 3 _2_7 - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L- 18270(Aer) 3.3.3 Discs - A metal or a plastic disc shall be provided to protect the interior of the equipment from foreign matter during haniing and storage
19、. The discs shall be not less than 1/8-inch thick and the same diameter as the outside diameter of the choke. The discs shall be drilled with not less than four holes to permit solid bolting to the choke. 3.3.4 Bolts, Lockwashers, and Nuts - Eight 1/4-inch diameter bolts, lockwashers, and nuts shall
20、 be sup- plied for connecting the adapter CG-384(4“) to the dummy load and to a waveguide coupling UG-54/U or UG- 200/U (BUSHIPS Dwg. No. RE49F334). 4. 4,l tests as follows: METHODS OF SAMPLING, INSPECTION, AND TEST Classification - The equipment specified herein shall be subject to preproduction an
21、d inspection (1) Preproduction Tests - Preproduction tests shall be made on a sample(s) representative of the production equipments, to determine that the production equipments will meet the requirements of this specification and the applicable subsidiary specifications. ance under the contract to d
22、etermine conformance with the requirements of this specification and the applicable subsidiary specifications and to determine that the test sets are equivalent in performance and construction to the approved preproduction sample. Any production prior to approval of the preproduction sample shall be
23、 at the contractors risk. Preproduction Tests - Preproduction tests shall be conducted on two preproduction models repre- Scope of Preproduction Tests - Preproduction tests shall be conducted at a laboratory designated by (2) Inspection Tests - Inspection tests shall be made on production test sets
24、submitted for accept- 4.2 sentative of the production equipment as follows: 4.2,l the procuring agency, and shall be in accordance with paragraph 4.2.1.2 of Specification MIL-T-945. The procuring agency, however, reserves the right to make additional preproduction tests other than those out- lined i
25、n Specification MIL-T-945 to insure compliance with this specification and the contract. 4.2.2 tractor shall furnish facilities for and shall conduct tests as required in paragraph 4.2 4 of Specification MIL-T-945. In addition, the data required in paragraph 4.2.3 of Specification MIL-T-945 shall be
26、 submitted to the procuring agency for review and approval prior to submission of any models. 4.2.3 Approval of Preproduction Models - Approval of preproduction model shall be by the procuring agency upon satisfactory completion of all tests. No additional models shall be delivered prior to the ap-
27、proval of the preproduction model. Prefabrication of any equipments prior to the approval of the prepro- duction model is. at the contractors own risk. One approved preproduction model will be returned to the contractor for his use in the fabrication and testing of the models to be submitted for acc
28、eptance under the contract The preproduction model shall not be considered as one of the models under the contract; how- ever, it may be reworked by the contractor and submitted for acceptance as a production model. 4.3 Inspection Tests - The contractor shall furnish all models and shall be responsi
29、ble for accomplish- ing the required tests. When inspection is conducted at the contractors plant, all inspection and testing shall be under the supervision of the cognizant Naval Inspector. Contractors not having laboratory testing facilities satisfactory to the Government shall engage the services
30、 of a commercial testing laboratory acceptable to the procuring agency. The contractor shall furnish test reports in duplicate, showing quan- titative results for all tests required by this specificat on, and signed by an authorized representative of the contractor or laboratory as applicable. Accep
31、tance or approval of material during course of manufacture shall in no case be construed as a guaranty of the acceptance of the finished product, Presubmission Tests - Prior to the submission of any models for preproduction testing, the con- 4.3.1 shall be of the followingtwo types: Scope of Inspect
32、ion Tests - Inspection tests shall meet all the requirements of MIL-T-945, and (1) Individual Tests - Individual tests shall be conducted on each model submitted for acceptance under the contract f 4 I 7 - - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IH
33、S-,-,-MIL-T-8270(Aer) I (2) Sampling Tests - Sampling tests shall be conducted on a quantity as approved by the procuring agency. Models submitted for sampling tests shall be selected by the Government inspector and shall first have passed the individual tests. Sampling tests shall be more extensive
34、 than tKe individual tests and may include any of the tests listed under preproduction tests which are deemed necessary by the inspector to determine that production models continue to be equivalent in performance and construction of the approved preproduction models. 4.4 spection testing of product
35、ion models shall be determined by the contractor. These test procedures shall be subject to review and approval by the procuring agency prior to the initiation of any testing. 4.5 Naval Inspector. 5. 5.1 with the requirements of Specification JAN-P-658 and shall be marked in accordance with the requ
36、irements of Specification MIL-STD-129. Suitable interior packing, blocking, and bracing shall be used to prevent shifting in the exterior shipping container and shock from handling in transit. 6. NOTES Procedures - The procedures for conducting presubmission testing of preproduction models and in- A
37、cceptance of Production Models - Acceptance of all production models shall be by the cognizapt PACKAGING AND PREPARATION FOR SHIPMENT Packaging - The equipment and spare parts shall be preserved, packaged, and packed in accordance 6.1 date of this specification. Ordering Information - invitation for
38、 bids and contracts or orders shall specify the title, number, PATENT NOTICE - When Government drawings, specifications, or other data are used for any purpose other than in connection with a definitely related Government procurement operation, the United States Government thereby incurs no responsi
39、bility nor any obligation whatsoever; and the fact that the Government may have formulated, furnished, or in any way supplied the said drawings, specifications, or other data is not to be regarded by implication or otherwise as in any manner licensing the holder or any other person or corpr- ation, or conveying any rights or permission to manufacture, use or sell any patented invention that may in any way be related thereto. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
