1、MIL-A-29521( EC) AMENOMENT 2 18 January 1989 SUPERSEmNG AMENOMENT 1 14 November 1988 ThIs amendment fonns a part of Military Specification MIL-A-29521(EC), dated 25 April 1988, and is approved for use within the Space and Naval Warfare Systems Comnand, Department of the Navy, and is available for us
2、e by all Department and Agencies of the Department of Defense. PAGE 4 2.1.2i “DRAWINGS* , “NAVAL UNDERWATER SYSTEMS CENTER, NEW LONDON LABORATORY (NUSC/NLLI“ , after “03428001 , add: “03432002 AN/BRA-34 Antenna Radome “O3744001 AN/BRA-34 EM1 Hardened Junction Box“. PAGE 10 * 3.2.1.8, first three lin
3、es: Delete and substitute: “3.2.1.6 GPS antenna and IFF antenna assembly (Unit 1A6). The GPS antenna and IFF antenna assembly shall perform the functions specified in a and b:“. * 3.2.1.8. Delete. 3.2.1,-10: Delete text and substitute: “The UHF switch deck shall combine UHF, GPS, and IFF received si
4、gnals, amplify UHF signals, separatenuHF and IFF transmitted signals, and provide for relay selection of UHF dipole or UHF helix antenna. . . PAGE 14 . 3.3.4.2a8 line 5: Delete t0.75 and substitute “*0.75“. PAGES 14 ANO 15 * 3.3.6 through 3.3.6.3:Delete. I PAGE 15 3.3.7e, fi-rst sentence, line 4: De
5、lete “65“ and substitute “30“. *The attached insertable replacement pages listed below are replacements for stipulated pages. When the new pages haue been entered in the document, insert the amendment as the cover sheet to the specification, Rep1 acernent page 5 6 7 8 Repri%#%?change 6 7 8 AMSC Hfh
6、FSC 5985 1 of i?. DISTRIBUTION STATEMENT A. Approved for pub1 ic release; distribution is un1 irni ted. - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-29521lEC) AMENDMENT 2 PAGE 16 * 3.3.7.1.5, line 2: Delete “0.1 Vi and substitute “0.1 volt
7、 (V)“. PAGE 19 3.3.12d, line 2: Delete “10“ and substitute “1“. PAGE 22 3.4.3.5: Delete. PAGE 23 TABLE III , “Junction box, port“ and “Junction box, starboard“: Delete entire entries and substitute: 3/ ?/ ?/ 11.7 (24)“. - “Junction boxes, port and starboard 4 and 5 TABLE III,-footnote 2): After “ree
8、l 286178“: Delete the period and substitute “, and TABLE III, add as footnote 21: NUSC DWG 03432002. I. “3/ - Dimensions shall be as specified in NUSC DUG 03744001. PAGE 24 * * 3.6.6.1a: Delete “1050 psi“ and substitute “1050 pounds per square inch (psi)“. * 3.6.6.2, line 2: Delete “70.3 kg/cm2“ and
9、 substitute- “70.3 kilograms per square centimeter“. PAGE 25 3.7, line 3: After “group“ iwert “inboard uriitr“. PAGE 28 TABLE V. “Design and construction“, “Requirement paragraph“: Delete “3.4.3.5“. PAGE 31 * TABLE Y: Delete the foliowing entries in their entirety: “Depth transducer performance char
10、acteri stics Output voltage Impedance Pressure“, PAGE 35 4.5.15, line 10: Delete “10“ and substitute “1“. PAGE 45 * APPENDIX A, 30,2.2,7ine 4: Delete “5.48 m (18 ft)“ and substitute: “5.48 meter (m) (18 feet (ft)“. The margins of this amendment are marked with an asterisk to indicate where changes (
11、additions, modifications, corrections, deletions) from the previous amendment were made. This was done a% a convenience only and the Government assumes no liablity whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document
12、based on the entire content irrespective of the marginal notations and relationship to the last previous amendment. Preparing activity: NAVY - EC (Project No. 5985-N589( EC) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-29521( EC ) AMENDMEN
13、T 2 NATIONAL FIRE PROTECTION ASSOCIATION (NFPA) NFPA 78-1988 National Electrical Code (Application for copies should be addressed to the National Fire Protection Associ at1 on 470 At1 antic Avenue, Boston, MA 02210. (Nongovernment standards and other pub1 ications are normally available from the org
14、anizations which prepare or which distribute the documents. These documents also may be available in or through libraries or other informational services.) 2.3 Order of precedence. In the event of a conflict between the text of this Nothing in this .specification, however, shall specifica-nces cited
15、 herein (except for associated detail sped ficationa, apecifScatisn sheets, or MS standards), the text of this specification aka91 taka precedence, supersede appI icabla I aws and regul ations un1 kas a specific exemption has been Qbtafnedo 3. REQUIREMENTS . 3.1 General. The antenna group shall conf
16、orm to the requirements of MIL-E-164mthe extent specified herein. The AN/BRA-34(Y), AN/BRA-34A(V), and AN/BRA-34B(V) are mu1 ti function antenna groups that rovi de signal s to (UHF) 1 i ne-of-si ght (LOS), Navy navi gat9 on satel 1 i te (NAVSAT) , UHF sate1 1 i te communications (SATCOM), identific
17、ation, friend or foe (IFF), and global positioning system (GPS) (AN/BRA-34( V)2, AN/BRA-34A(V)2, and AN/BRA-349( VI2 configurations only) submarine communications and navigation requirements. The antenna group shall consist of an antenna control unit in the radio room and an interconnecting junction
18、 box, a hull-penetration (see 6.4.5) connector for electrical connections, a special purpose electrical cable, and a mast antenna. There are six- configurations of the antenna group: AN/BRA-34(V)l, AN/BRA-34A(Y) 1, AN/BRA-34B(V)1, AN/BRA-34(V)2, AK/BRA-34A(V)2, and AN/BRA-34B(V)2. Incorporation of s
19、oftware, firmware, or microprocessors in the antenna group shall not be pemi tted. sample shallbed to first article inspection (see 4.3 and 6.3). communication and navigation systems and support ve P y low frequency (VLF), low . Crequency (LF), medium frequency (MF), high frequency (HF), ultra high
20、frequency L 3.1.1 First article. When specified in the contract or purchase order, a 3.1.2 Antenna group description. The antenna group shall consist of the equipment shown in FIGURE 1. The antenna group relationship of units shown in FIGURE 2 is typical and is provided for reference only. Antenna g
21、roup drawings, NAVSEA microfilm reel 28617A and reel 286178, and NUSC drawing (DWG) 03428001 shall be used for general guidance, unless specifically referenced. . 3,2 Details of units or parts. Detailed requirements shall be as specified in 3.2.1 through 3.2.8. 5 Repri nied without change Provided b
22、y IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-29521 (2) 54 9499906 03bb973 1 _ MIL-A-29521( EC) AMENDMENT 2 .I- ! W N o s m a. Y K -I 51 3 r N m P n D c a, a ci u C a, E O c ci. E m - a .C 3 U a, o c O CL E a, .r .C L .n 4 W OL D W -4 k 6 Supersedes pa
23、ge 6 of MIL-A-29521EC) of 25 April 1988 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-.- MIT 1 IXE NOTE il AiITENHA El8I.Y* - OFu%R HULL rtHmAn WIT 7 IHIOARD 1. ANIBRA-34 and ANIBRA-34A port installation shown. Starboard installation has Unit 1 on
24、starboard side of sail and has starboard junction box, Unit 5. ANIORA-348 is as shown except GPSIIFF output is from junction box - not control unit. Not part of Antenna Group, 2. 3. ANIORA-34 (V) . FIGURE 2. Antenna group, relationship of units. - Supersedes page 7 of MIL-A-29521EC) of 25 April 1988 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
