1、MILITARY SPECIFICATION BUOY , RADIO TRANSMITTING T-616 ( ) /SRT 1. SCOPE 1.1 This specification covers a radio transmitting buoy for emergency use by a submarine. (MHz) and transmits an emergency message. The buoy is similar, in many re- spects, to the model T-616B/SRT. The equipment operates on a f
2、requency of 243.0 megahertz 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on date of issuance of procurement action, form a part of this specification to the extent speci- fied herein. In the event of conflict between the detail requirements of this specification and tho
3、se of supporting documents, this specification shall govern. SPECIFLCATIONS MILITARY MIL-S-901 - Shock Tests, H.I. (High Impact): Shipboard Machinery, Equipment and Systems, Requirements for MIL-Q-9858 - Quality Program Requirements MIL-E-16400 - Electronic Equipment, Naval Ship and Shore; General S
4、pecification XIL-E-17555 - Electronic and Electrical Equipment, Accessories, and Repair Parts, Packaging and Packing of STANDARDS MIL-STD-105 - Sampling Procedures and Tables for Inspection by MIL-STD-109 - Quality Assurance Terms and Definitions ML-STD-1-67 - Mechanical Vibrations of Shipboard Equi
5、pment MIL-STD-454 - Standard General Requirements for Electronic MIL-STD-749 - Preparation and Submission of Data for Approval of MIL-STD-781 - Reliability Tests: I Attribut es Equipment Nonstandard Parts . Exponential Distribution i MIL-STD-785 - Reliability Program for Systems and Equipment Develo
6、pment and Production 3. REQUIREMENTS 3.1 First article sample. Prior to beginning production, a sample shall be tested as specified in 4.2 (see 6.4). 3.2 Equipment. The buoy includes the major assemblies specified below. The equipment shall be in accordance with MIL-E-16400 except as hereinafter spe
7、cified. THIS DOCUMENT CONTAI N s !?PAGES FSC B 5 20 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-6-28777 58 U 7Ob 0254754 O m rm- -283?9(Ei) 3.2.1 Major assemblies. The equipment shall consist of one each of the following major assemblies, (d)
8、 Top Shield -(e) Shock and Vibration Mount 3.3 Output frequency, accuracy and stability. The output frequency shall be 243.0 MHz within k30 kilohertz (kHz) under all environmental conditions specified herein. The frequency determining crystal and associated circuits shall permit manual adjustment of
9、 the output frequency to precisely 243.0 MHz to counter the effects of intermittent testing and storage for periods up to 3.4 Emission. The emission shall be A-2 (keyed audio only, carrier “on“ continuous iy) . 3.5 Modulating frequency. The modulating frequency shall be 500 Hz Sr10 percent. 3.6 Modu
10、lation percentage. The percentage modulation shall be 75 per- cent +5 percent. 3.7 Radio frequency output spectrum. Ninety percent of the radio fre- quency (RF) output energy, carrier and sidebands, shall be within a 7.5 kHz bandwidth. 3.8 Keying. Keying shall be from an internal code wheel containi
11、ng the letters and forming the message “SOS SUB SUNK SOS“ in International Morse Code. The Code wheel RPM shall not be less than two nor more than three during the 14 hour specified operating time and conditions. 3.9 RF power output. The RF power output shall not be less than 560 milliwatts (mW) wit
12、h the carrier unmodulated and not less than 270 mi4 with the carrier modulated. 3.10 Antenna, The RF radiating system shall effect radiation in an es- sentially omnidirectional pattern. erecting after buoy launching. The antenna shall be automatically self- 3.11 Battery. The battery shall be a magne
13、sium silver chloride sea water activated type. Nominal voltage shall be 7.5 volts. 3.12 Continuous operation, The equipment shall be capable of meeting the performance required herein for a continuous period of 14 hours without battery change. 3.13 Automatic operation. The buoy operation shall be au
14、tomatic and shall meet the performance requirements specified herein within 5 minutes sub- sequent to immersion of the battery. 3.14 Size. The overall diameter and length shall not exceed 3.0 inches (7.62 cm) am9 l/2 inches (100.33 cm) respectively. Provided by IHSNot for ResaleNo reproduction or ne
15、tworking permitted without license from IHS-,-,-3.15 Weight. The dry buoy weight, less battery and accessories (des- sicator assembly, trim weights, top shields, and so forth) shall be 3 lbs. io ounces, +1/2 ounce. 3.16 Flotation requirements. 3.16.1 The buoy freeboard in calm sea water shall be 5 1
16、14 inches *1/4 inch (13.335 k0.635 cm) measured from the water surface to the joint between the housing and antenna cap. 3.16.2 The buoy shall free float in calm sea water within 5 degrees of vertical. (Sea water for the purposes of this specification is defined as water ob- tained from a city sourc
17、e that is provided for drinking purposes and modified to contain 3.5 percent (by weight) of NaC1 (Sodium Chloride).) 3.17 The buoy shall meet the electrical performance required herein upon each surfacing following submergence for 15 continuous minutes and then again submerged for 2 continuous secon
18、ds during each minute for 500 minutes. 3.18 Performance recovery subsequent to submergence. The buoy shall meet the electrical performance required herein within 1 second upon emergence of the complete antenna insulator following complete buoy, including antenna, submergence in sea water. 3.19 Desic
19、cator. The desiccator shall be a two-piece assembly consist- ing of a sleeve covering the battery compartment sides and a removable trans- parent case covering the open end of the sleeve. O rings placed at the top and lower ends of the sleeve shall provide necessary sealing to preclude ex- cessive m
20、oisture entrance to the battery compartment. Another cushioning ring shall be located on the sleeve above the top of transparent case to center and cushion the lower end of the battery case. The desiccant shall be retained in the transparent case by an easily removable perforated metal screen. tact
21、probe shall be mounted on the desiccant case and permit application of an external test voltage to the buoy circuits without removal of the desiccator. The desiccant employed shall be type bright blue 6-16B Mesh Silica Gel, Eagle Chemical Works, Mobile, Alabama or equivalent. The seals shall be adeq
22、uate to reduce requirement for substitution of the desiccant to greater than 3,000 hour intervals. or equivalent. A con- The transparent desiccant container material shall be acrylic 3.20 Finish and painting. The finish and painting shall be in accord- ance with MIL-E-16400. The exterior color excep
23、t for markings shall be bright red fluorescent. 3.21 Top shield. The top shield shall provide the following functions: (a) Protect the top portion of the buoy finish coat. (b) (c) Retain antenna in folded position when buoy is stored. Enclosure for antenna end of buoy when installed in shock and vib
24、ra tion mounting . 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-28799 58 = 999990b 0L5LtSb lil/ (1) The shield dimensions shall permit easy insertion and removal of the and be adequate for use under the specified environmental conditions,
25、for stance, temperature, humidity, shock, vibration, and so forth. (2) The overall length of the shield shall be 7 718 inches ?1/8 inch (20 k0.3175 cm). (3) The shield material shall be “Pliobond ADH“ or equivalent. buoy in- 0025 (4) The words “REMOVE BEFORE LAUNCHING“ in 114 inch (0.635 cm) block l
26、etters shall be silk screened on white on the outer surface. 3.22 Shock and vibration mount. A mounting assembly shall be provided for retaining the buoy. The assembly shall permit easy removal and insertion of the buoy without damage or the, use of tools or special procedures. By re- moving only th
27、e upper portion of the buoy from the assembly, complete opera- tional testing shall be possible. The upper bracket shall be provided with a test bridle to hold the buoy in the test position. It shall not be possible to return the buoy to its normal position without releasing the test bridle, Complet
28、e instructions for buoy launching shall be included as part of this mounting assembly. 3.23 Launching time. It shall be possible to remove the buoy from its normally installed condition and inserted in an adjacent launching tube within 5 seconds. 3.24 Identification and labeling. Each buoy shall be
29、clearly identified by an identification plate. Additionally, an aluminum foil label containing the following shall be provided: “THIS DEVICE IS A RADIO TRANSMITTER AND DOES NOT CONTAIN ANY EXPLO- FOUND, PLEASE INFORM U. S. NAVY IMMEDIATELY. n SIVES. IT WAS RELEASED BY A u. s. NAVAL VESSELIN DISTRESS
30、. IF 3.25 Environmental. The equipment shall meet the performance require- ments specified herein, without the necessity for realignment or readjustment of any controls, under the following environmental conditions: 3.25.1 Temperature. (a) (b) Continuous operation (in air) -OC to plus 40C. Nonoperat
31、ing - minus 62OC to plus 75OC. 3.25.2 Humidity. The buoy (nonoperating) shall be capable of withstand- ing relative humidities ranging up to 95 percent for both continuous and inter- mittent periods. 3.25.3 Shock, The equipment shall be capable of withstanding the shock test for Grade A, Class I, li
32、ght weight, Type A equipment as specified in MIL-S-901 when the buoy is mounted in the shock and vibration mount. 3.25.4 Vibration. The equipment shall be capable of withstanding Type I of MIL-STD-167 when buoy is mounted in the shock and vibration mount. 4 Provided by IHSNot for ResaleNo reproducti
33、on or networking permitted without license from IHS-,-,-MIL-6-28799 54 9999906 0354957 6 a 3.25.5 Inclination. Inclination shall be as specified in MIL-E-16400 except plus and minus 30 degrees at the rate of 7 cycles per minute in any plane. 3.25.6 Hydrostatic pressure. The equipment shall be capabl
34、e of being launched from the submarines flare tube into sea water which is at a hydro- static pressure of 1,000 pounds per square inch (psi) and subsequently upon reaching the water surface meet the electrical performance requirements speci- fied herein. 3.26 Reliability program. The supplier shall
35、establish and implement a reliability program in accordance with MIL-STD-785. 3.26.1 Quantitative reliability requirement. The equipment shall have a mean time between failures (MTBF) of 100 hours. 3.27 Equipment, materials, parts and manufacturing. Equipment, mate- rials, parts and manufacturing sh
36、all be in accordance with MIL-E-16400 except as otherwise specified herein. As this equipment must be fully operational subsequent to periods of nonoperating times (except for limited testing from external battery) up to 10 years, particular care shall be exercised in the selection of materials and
37、parts and manufacturing methods which sustain char- acteristics over long periods with only infrequent tes ting. 3.28 Design and construction. A buoy will be loaned to the contractor The use of the Government furnished as a guideline sample only (see 6.5). sample shall not relieve the contractor of
38、meeting the performance require- ments of this specification. 3.29 Interchangeability. Overall equipments, modules, assemblies, sub- assemblies, components and parts of the first article and production models shall be electrically and mechanically interchangeable with corresponding units contained i
39、n the standard sample. 3.30 Nonstandard items. Wherever nonstandard items are employed in the Use of nonstandard parts in the sample the contractor shall substitute mechanically and electrically inter- changeable standard parts wherever possible. sample does not establish or imply nonstandard parts
40、waiver or approval to use nonstandard parts in this equipment. Procedures for obtaining approval for use of nonstandard items shall be in accordance with requirement 22 of MIL-STD-454 except that steps I and II of MIL-STD-749 shall be accomplished simultaneously. Approvals for nonstandard items are
41、contingent on subsequent performance within limits specified herein for both first article and produc- tion type equipments. 3.31 Workmanship. Workmanship shall be in accordance with requirement 9 of MIL-STD-454. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise spe
42、cified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. specified in the contract or order, the supplier may use his own or any other Except as otherwise 5 Provided by IHSNot for ResaleNo reproduction or networking
43、 permitted without license from IHS-,-,-MIL-B-28777 58 - 777770b 015V758 8 W MIL-8-28799 (EC) facilities suitable for the performance of the inspection requirements speci- fied herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth
44、 in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.1.1 Contractors quality assurance system. The contractor shall pro- vide and maintain a documented quality program acceptable to the Government for all contracted i
45、tems. The quality program shall be in accordance with MIL-Q-9858, 4.1.2 Quality assurance terms and definitions. Quality assurance terms and definitions shall be as defined in MIL-STD-109. 4.1.3 General inspection. Inspection shall be as specified in MIL-E- 16400 except as hereinafter specified. 4.2
46、 Classification of inspections. The methods of examination and test- ing are classified as follows: (a) First article inspection (see 4.3) (b) Quality conformance inspection (1) Production inspection (see 4.4.1) (2) Production control inspection (see 4.4.2) (3) Environmental inspection (see 4.4.3) (
47、4) Inspection of preparation for delivery (see 4.4.4) (c) Reliability testing (see 4.5) 4.3 First article inspection. Unless otherwise specified (see 6.1) one unit shall be required for first article inspection. shall consist of all examinations and tests necessary, as determined by the Government t
48、o indicate conformance with each requirement of this specification. First article inspection shall consist of the tests as specified in table I and the preproduction examinations and tests of MIL-E-16400. First article inspection 4.4 Quality conformance inspection. 4.4.1 Production inspection. Produ
49、ction inspection shall be in accord- ance with MIL-E-16400 and table I and shall be made on every equipment of- fered or delivery. 4.4.2 Production control inspection, Production control inspection shall be in accordance with MIL-E-16400 and table I including sampling, shall conform to the inspection procedures of MIL-STD-105 using the special inspec- tion levels. The inspection level shall be S-4 for normal, tightened and re- duced inspection with an Acceptable Quality Lev
