1、A-A-50603 m 7799974 O326622 273 m Beneficial comments, recommendations, additions, deletions, clarification, etc. and any other data which may improve this document should be sent by letter to: Commander, Naval Sea Systems Command, Attn: 05442, 2531 National Center Sldg. 3, Washington, DC 20362-5160
2、. I METRIC 1 11 February 1993 SUPERSEDING 18 November 1959 A-A-50603 MIL-L-22250(SHIPS) COMMERCIAL ITEM DESCRIPTION LOUDSPEAKER - MICROPHONE (MEGAPHONE, ELECTRONIC, PORTABLE) The General Services Administration has authorized the use of this commercial item description as a replacement for MIL-L-222
3、50A(SH) which is cancelled. Abstract. This Commercial Item Description covers requirements for a hand held electronic megaphone, which is rugged, lightweight, portable, and amplifies audio frequencies for transmitting intelligible speech over distances in excess of 200 meters through high ambient no
4、ise levels (85 db). This description covers commercial off-the-shelf megaphone equipment with minor modifications essential to adapt equipment for Military use. Salient characteristics. 1, Integral Components. The megaphone shall consist of a microphone and housing, loudspeaker assembly, gain contro
5、l, amplifier, battery compartment and operating handle. In addition the megaphone may include one or more of the following options: hand held microphone, spotlight, siren, whistle, auxiliary vehicle power adapter, or shoulder strap. 2. Enclosure. All megaphones shall be moisture and splash proof as
6、well as corrosion resistant. Licensed by Information Handling ServicesA-A-50b03 m 9999iV 0326623 LOT m RATED POWER MAXIMUM POWER A-A-50603 MAXIMUM POWER CONSUMPTION 2.1 Moisture proofing. All electronic components shall be conformal coated to ensure operability in a moisture laden environment. low 1
7、2w 16W 2.2 Splash proofing. Microphones and speaker horns shall be constructed of materials that are unaffected when splashed with water. 16W 16w 16W VOICE c16w 2 5W SIREN 25W 25W VOICE 25W 40W SIREN 40w 2.3 Preservation. All parts shall be of suitable corrosion resistance material or materials trea
8、ted in a satisfactory manor to render them adequately resistant to corrosion caused by sea water. 3. Weight and size. The maximum weight of the megaphone includeing the battery compartment shall be 1.5 kilograms without batteries, the maximum length shall not exceed 350 millimeters and the maximum h
9、orn diameter shall not exceed 200 millimeters. 4. Microphone. The microphone shall be an anti-howling, 600 ohm, 1 millivolt, dynamic type microphone mounted in the main body of the megaphone. 5. Horn assembly. The horn assembly shall consist of a horn unit, voice coil, diaphragm assembly and annular
10、 plug (if required). 6. Power Output. Megaphones shall operate at a rated output power of at least 10 watts or greater when measured with a 1000 Hertz, 1 millivolt input signal. 7. Power consumption. Megaphone power consumption shall be in accrordance with the guidance listed below. 8. Power Sources
11、. Megaphones shall be powered from dry cell batteries. 9. Equipment Operating Time. The equipment shall operate in excess of five (5) hours voice and thirty (30) minutes siren without requiring a battery change. 2 Licensed by Information Handling ServicesA-A-50603 W 9999974 OL2bb24 046 W A-A-50603 g
12、ualitv assurance provisions. 1. Contractor certification. The contractor shall certify and maintain substantiating evidence that the product offered meets the salient characteristics of this Commercial Item Description and that the product conforms to the producers own drawings, specifications, stan
13、dards and quality assurance practices. The government reserves the right to require proof of such conformance prior to the first delivery and thereafter as may be otherwise provided for under the provisions of the contract. 2, Regulatory requirements. The offerer/contractor is encouraged to use reco
14、vered materials in accordance with Public Law 94-580 to the maximum extent practicable. 3. Preservation, packaging, packing, labeling, and marking. The preservation, packaging, packing, labeling, and marking shall be as specified in the contract or order. 4. Identification numbers. The following par
15、t identification nimbering procedure is for government purposes and does not constitute a requirement for the contractor. A i 50 03 12 c - LVP Example of part identification number Variable characteristics (16 max) I LVP = Light, Vehicle Power Adapter, and Portable Microphone opt ions se lec ted. 12
16、 = 12V Operating Voltage OC = C Cell Batteries CID number Designate Commercial Item Description 3 Licensed by Information Handling ServicesA-A-50603 9999974 Ol12bb25 T2 A-A- 50603 5. Ordering data. Procurement documents should specify the following: a. Type. L - Light W = Whistle S - Siren V - Vehic
17、le Adapter P - Portable Hand Held Microphone C - Shoulder Strap A * All b. Operating Voltage. O9 = 9 vdc 12 - 12 vdc c. Battery Type. OC = C cell OA = A Ceil AA - AA Cell OR - R-14 MILITARY INTERESTS: Custodians: Navy - SH Army - CR Review activities : Army - AT, CE Navy - AS, TD Air Force - 13, 85 DIA - DP, ES, GS CIVIL AGENCY COORDINATING ACTIVITIES: COMMERCE - NIST GSA- FSS Preparing activity: (Project 5830-N094) NAVY- SH User activities: Navy - YD, CG, MC Air Force - 90 Army - MT DIA - IP, IS, LS 4 Licensed by Information Handling Services
