NAVY A-A-50621-1993 LOUDSPEAKERS PERMANENT MAGNET FOR SHIPBOARD ENTERTAINMENT SYSTEMS《船娱乐系统永久磁铁扩音器》.pdf
《NAVY A-A-50621-1993 LOUDSPEAKERS PERMANENT MAGNET FOR SHIPBOARD ENTERTAINMENT SYSTEMS《船娱乐系统永久磁铁扩音器》.pdf》由会员分享,可在线阅读,更多相关《NAVY A-A-50621-1993 LOUDSPEAKERS PERMANENT MAGNET FOR SHIPBOARD ENTERTAINMENT SYSTEMS《船娱乐系统永久磁铁扩音器》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、 - .r A-A-50621 m 9999974 0163549 4bb m LMETRIC I A-A- 50621 23 February 1993 SUPERSEDING 16 September 1968 MIL-L-l7080C(SHIPS) COMMERCIAL ITEM DESCRIPTION LOUDSPEAKERS, PERMANENT MAGNET FOR SHIPBOARD ENTERTAINMENT SYSTEMS The General Services Administration has authorized the use of this commercial
2、 item description as a replacement for MIL-L-17080C which is canceled. Abstract. loudspeakers suitable for use on naval ships. This Commercial Item Description covers requirements for permanent magnet Salient characteristics. Loudspeakers furnished under this Commercial Item Description shall be of
3、the permanent magnet direct radiator type. The speaker enclosure, designed for bulkhead mounting, shall contain a loudspeaker unit with a cone having a nominal 203 mm diameter, a line matching transformer, a volume selector switch and-a channel selector switch. 1. Integral components. Loudspeaker as
4、semblies shall consist of the following integral components manufactured in accordance with the following specifications or as specified herein: (a) Loudspeaker. EIA-SE-103 Speakers for sound equipment EIA- 157 EIA- 276 Method for determining air gap flux density and aqy. Acceptance Testing of Dynam
5、ic Loudspeakers Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any other data which may improve this document should be sent to: Commander, Naval Sea Systems Command, SEA 031242, 2531 Jefferson Davis Hwy., Arlington, VA 22242-5160. AMSC N/A FSC 5965 DISTRIBUTION
6、 STATEMENT A. Approved for public release; distribution is unlimited. Licensed by Information Handling ServicesA-A-50623 7979974 0363550 LBB ri .- * A-A-50621 (b) Volume and Channel Selector Switch (Rotary). EIA-520F000 Sectional Specification for Rotary Switches of Certified Quality (Low Current Ca
7、pacity - 2 Amperes or Less) (c) Enclosure. Bulkhead enclosures shall be as specified herein. 2. Enclosure. (a) Loudspeaker enclosure. The loudspeaker enclosure shall have three 13 mm diameter holes in the back plate for bulkhead mounting. Except for the increased depth incident to opening the hinged
8、 front cover 90 degrees and the clearance dimensions required to install, remove, or service the loudspeaker. The enclosure shall not be not greater than the following dimensions: Mounting details shall be as shown on figure 1. Width - 380 mm Height - 380 mm Depth - 230 mm 1. Enclosure openings. The
9、 enclosure shall have an opening for the loudspeaker face, This opening and any port openings required to meet the specified performance characteristics, shall be covered with metal mesh or perforated metal not less than 1 mm thick. Mesh openings or perforations shall be not larger than 2 mm. 2. Enc
10、losure construction. The enclosure shall be provided with a hinged front cover, held closed by a catches requiring no tools for operation. Opening the cover shall provide ready access to all interior components and to the enclosure mounting holes. Opening the enclosure shall not involve the disturba
11、nce of incoming cables or stuffing tubes. Component mounting fasteners shall be secured so asto not require demounting of the enclosure for component replacement. Components shall be mounted so that their terminal markings are easily visible with the enclosure door open. Damping material, if used, s
12、hall be fastened positively. 3. Cable entrance. Facilities shall be provided to admit cables through the bottom of the enclosure utilizing stuffing tubes. 2 Licensed by Information Handling ServicesA-A-50b21 m 9999934 0163551 Ob4 m A-A- 50621 I TYPE LS-443IWD-1 / I 203 TYPE LS-444/WIH AND TYPE LS-54
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