1、14 September 196 MIL-I-24078(SHI MILITARY SPECIFICATION INTERCOMMUNICATION STATIONS NAVAL SHIPBOARD 1. SCOPE 1.1 Scope. - This specification covers LS-518( )/SIC and LS-519( )/SIC intercommunication stations for use in Naval shipboard announcing systems. 1.2 Classification. - The intercommunication
2、stations shall be of the following types as specified (see 6.2). The type designation for the intercommunication stations contains parentheses which are to be replaced by a letter indicating a particular make or model that differs from previous production. Nomen- clature shall be requested as requir
3、ed by MIL-E-21981. 1.2.1 Type LS-518( )/SIC. - Type LS-518( )/SIC station shall be suitable for installation in protected locations and shall be capable of selecting 10 other stations in any combination of at least 2 stations re- gardless of type. 1.2.2 Type LS-519( )/SIC. - Type LS-519( )/SIC stati
4、on shall be suitable for installation in protected locations and shall be capable of selecting 20 other stations in any combination of at least 2 stations re- gardless of type. 2. APPLICABLE DOCUMENTS 2.1 The following documents,of the issue in effect on date of invitation for bids or request for pr
5、oposal, form a part of the specification to the extent specified herein. SPECIFICATIONS MILITARY MIL-T-27 - Transformers and Inductors (Audio, Power and Pulse). MIL-(2-62 - Capacitors, Fixed, Electrolytic (DC, Aluminum, Dry Electrolytic, Polar- MIL-C-915 - Cable, Cord and Wire, Electrical (Shipboard
6、 Use). MIL-1-983 - Interior Communication Equipment; Naval Shipboard, Basic Design Require- MIL-C-2194 - Cables, Power, Electrical, Reduced Diameter Type, Naval Shipboard. MIL-C-3965 - Capacitors, Fixed, Nonsolid, Electrolytic (Tantalum), Foil and Sintered MIL-L-12606 - Loudspeaker, Permanent Magnet
7、 (Unencased, 4-inch Diameter Cone, 2-Watt, MIL-M-15071 - Manuals, Equipment and Systems. MIL-T-15514 - Telephone, Sound Powered (Handsets, Head-Chest Sets, and Head- MIL-E-17362 - EIectronic Repair Parts Requirements, Procedures for Provisioning Tech- MIL-E-17555 - Electronic and Electrical Equipmen
8、t and Associated Repair Parts, Prep- MIL-1-17928 - Intercommunication Stations, Naval Shipboard Use. MIL-A-20222 - Announcing-Equipment, Shipboard. MIL-E-2 198 1 - Electronics Type Designations, Identification Plates and Markings, MIL-1-22560 - Intercommunication Stations, Hands-Free Operated Reply
9、Reproducer, ized), General Specification For. ments For. Slug, General Specifications For. Gunblast - and Immersion-Resistant), Type LS-445JV. Transmitter Sets). nical Documentation and Stock Numbering. aration for Delivery of. Requirements For. Naval Shipboard. Licensed by Information Handling Serv
10、icesMIL-1-24078 58 W 9999906 0442472 9 MIL-I-24078(SMPS) STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes. MIL-STD-800 - Electron Tubes, Selection and Use of. MIL-STD-275 - Printed Wiring for Electronic Equipment. MIL-STD-701 - Preferred and Guidance Lists
11、 of Semiconductor Devices, DRAWINGS BUREAU OF SHIPS 9000-S6502-74117 - Microphone-Plug and Receptacle 9000-S6502-74164 - Type IC; MPBI-4 Microphone (Copies of specifications, standards, drawings, and publications required by suppliers in connection with specific procurement functions should be obtai
12、ned from the procuring activity or as directed by the contracting officer.) 2.2 Other publications. - The following document forms a part of this specification to the extent specified herein. proposal shall apply. Unless otherwise indicated, the issue in effect on date of invitation for bids or requ
13、est for OFFICIAL CLASSIFICATION COMMITTEE Uniform Freight Classification Rules (Applications for copies should be addressed to the Official Classification Committee, 1 Park Avenue at 33rd St., New York 16, N. Y.) 3. REQUIREMENTS 3.1 Preproduction sample. - A preproduction sample shall be furnished f
14、or the tests specified in 4.2 (see 3.27 and 6.3). 3.2 Description. - The intercommunication station, hereinafter referred to as the “equipment“, shall have selector switches for calling the required number of stations, a release light, a call light, a busy light, one press-to-talk switch, a micropho
15、ne receptacle, a dimmer control, and one volume control switch. The equipment shall have a transistorized amplifier-speaker for voice amplification and trans- mission and shall be suitable for installation in protected locations. 3.3 General features. - The equipment shall be in accordance with the
16、following paragraphs of MIL-1-983 in addition to the requirements specified herein. (Whenever a requirement of MIL-1-983 con- flicts with a requirement of this specification, the requirement of this specification shall govern. ) General requirements Definitions Materials, general Substitution of (eq
17、ual or superior) materials or parts Fungus-inert materials Unacceptable mate rials Acceptable materials Flammable materials Arc-resistant materials Toxic materials Wood Aluminum Iron and steel Nonferrous material (except aluminum) zinc Springs (material) Other metals Plastics 2 Licensed by Informati
18、on Handling ServicesMIL-1-24078 58 799970b 0442473 fl - MIL -1-24078(SHIPS) Ceramics Impregnating, embedding and encapsulating compounds Lubricants and lubrication Painting Protection against corrosion Bolts, machine screws, studs and nuts Gaskets Locking devices Washers Parts-electrical-general Ele
19、ctron tube or capacitor sockets Capacitors Variable resistors Transformers Relays Electrical tapes Batteries Dial illumination lamps Switches Indicator lights and lampholders Fuses Metallic rectifiers Enclosure-degree of (see 3.9) Enclosure -mounting Minimum sheet metal thicknesses (watertight enclo
20、sures) Cable entrance Threaded devices Rounded corners and edges Welding Temperature and humidity (special cold limit applies) Shock, vibration and inclination (vital vibration test required) Primary power supply circuits Power supply tolerances (normal power supply, 115 volts, 60 cycle, single phas
21、e) Shielding and radio frequency noise reduction Ground potential and grounding Soldering Electrical parts mounting Internal subassembly connection Terminal boards, connectors and terminals Wiring Color coding Electrical insulation Dielectric strength and insulation resistance clearances Drawings -g
22、eneral Drawings-preliminary Drawings -working Schematic diagrams Wiring diagram Drawing list Assembly drawings Interchangeability and standardization Manuals (see 3.30) Repair parts (electronic) (see 3.29) Designation and marking (see 3.28) Nomenclature Workmanship and general examination 3.4 Design
23、. - The equipment shall be designed to provide naturalness and intelligibility of speech under quiet conditions, penetrating ability of speech under noisy conditions, dependability of operation, and accessibility for servicing. 3 Licensed by Information Handling ServicesMIL-1-24078 58 W 7777706 O442
24、474 2 MIL-1-2407 8(SHlPS) 3.5 Fuseholders. - Fuseholders shall be of a spring clip type and shall be silver plated. 3.6 Station selector switch. - The station selector switch shall be a self-locking gang-type push- button assembly, For the type LS-518( ),SIC intercommunication station, the switch sh
25、all contain 10 switch pushbuttons and 1 release button. For the type LS-519( )/SIC intercommunication station the switch shall contain 20 switch pushbuttons and 1 or 2 release pushbuttons. When operated, all switch pushbuttons shall remain in the operated position, regardless of the sequence of oper
26、ation, until the release button is depressed. Switch blades shall be of the bifurcated type. All switch contacts shall be of fine silver or better. Each station pushbutton shall be capable of withstanding 100, O00 operations without failure when assembled in the equipment and connected for normal op
27、eration. Design of the switch shall be such that it will continue to perform its function after being subjected to the shock and vibration tests required by MIL-1-983. 3.7 Size and weight. - The equipment size and weight shall not exceed the following: (a) LS-518( )/SIC Case Width 10-3/4 inches Dept
28、h 9 inches Height 10 inches Weight 42 pounds (b) LS-519( )/SIC Case Width 10-3/4 inches Depth 9 inches Height 10 inches Weight 48 pounds Overall (including mounting plate and handle grips) 11 inches 10 inches 12-1/2 inches Overall (including mounting plate and handle grips) 11 inches 10 inches 12-1/
29、2 inches 3.8 Microphone receptacle. - A microphone connector receptacle as shown on Drawing 9000-S6502- 74117 shall be provided on the front panel of all units for use of microphones and handsets as specified in 3.24.6 and 3.25.7. Wiring to the microphone receptacle shall be as shown on figure 1. 3.
30、9 Enclosure. - The equipment enclosure shall be designed for mounting on a bulkhead, in a panel, or on a desk. A removable mounting plate or similar means shall be provided to allow mounting of the unit on a bulkhead. With the mounting plate removed, the unit shall be suitable for mounting on a desk
31、, using three or four mounting bolts on the bottom of the enclosure. The front panel including the amplifier and control circuits shall be removable from the enclosure. The enclosure shall be steel or aluminum. The enclosure shall be dripproof in accordance with MIL-1-983. 3.10 Front panel and case
32、securing bolts. - Through bolting for the purpose of securing the front panel to the case and for securing the case in its mounted position will be permitted. All securing bolts shall have hexagonal heads with screwdriver slots. Sufficient space shall be allowed around bolt head sur- faces to permit
33、 removal with a socket wrench. 3.11 Front panel surface. - The front panel shall be free of unnecessary projections. The depth of all operating controls in the nonoperated position shall be approximately the same distance from the front panel surface. 3.12 Handle grips. - Handle grips shall be provi
34、ded on the front panel to facilitate withdrawal of the front panel from the case. 3.13 Electrical connections. - 4 Licensed by Information Handling ServicesMIL-I-24078(SHIPS) 3.13. 1 Ships wiring connections. - A terminal board shall be provided for connecting ships wiring to the equipment. Sufficie
35、nt terminals shall be provided on the terminal board to allow ships wiring connections for all modes of operation. 3.13.2 Plug-in connectors, - Multi-contact plug and jack connectors shall be provided which will disconnect the unit from ships wiring when it is removed from its case. The plug shall b
36、e mounted on the unit and the jack shall be mounted in the rear of the case such that the plug engages in the jack when the unit is placed in its case. The connectors shall employ a floating type of mount to assure positive alignment and positive connection. 3.13.2.1 Alignment guides. - Alignment gu
37、ides shall be provided to assure positive alignment between the plug and jack connectors. The guides shall support the unit during insertion and removal intervals and while in the case. The guides shail prevent any damage to the plug-in connectors or any part of the unit during insertion and removal
38、 of the unit from its case, 3.14 Drainage. - Drainage shall be provided for any panel recesses which otherwise would be sus- ceptible to collection of water. 3.15 Control knobs. - The size and shape of the operating control knobs shall be suitable for the function for which they are intended. 3.15.1
39、 The position of all switch controls shali be clearly visible in the normal or operated posiEion. 3.15.2 Knobs and shafts shall have suitable flats or rectangular shapes on the connecting parts and . shall be secured with a through roll-pin or other approved means. 3.16 Gaskets. - Gaskets shall be u
40、sed, if necessary, for making dripproof seals between the case and front panel assembly. Gaskets shall be used for operating controls of the translating and rotary motion types. ease of replacement. When the unit is removed from its case for servicing, all component parts shall be protected from pos
41、sible damage when placed on any of its sides. 3.17 Servicing. - With the unit removed from its case, all components shall be readily accessible for 3.18 Transformers. - Transformers shall be grade 5, class S, life expectancy X, as specified in MIL-T-27. Where special shielding problems exist, such a
42、s in input circuits of audio amplifiers, the use of encased type transformers employing high permeability alloy shields will be permitted. 3.19 Relays, - Relays if used, shall conform to MIL-1-983 and shall have removable dustproof covers. 3.20 Illumination and controls. - All illumination shall be
43、red in accordance with MIL-1-983. Illumi- nation lamps shall be located to permit direct replacement of each lamp individually from the exterior of the enclosure. Control and level of illumination shall be as follows: (a) All signal indicators, busy, call, and release, shall be energized at normal b
44、rilliance. Control of signal indicators shall be accomplished by means of an “ON-OFF“ switch. The switch shall be a part of the dimmer control for the station identification marker and shall be “OFF“ in the minimum or fifth position of the dimmer controls. At normal brilliance, the level shall be su
45、ch that the indications are visible at a distance of 18 inches when the equipment is mounted in areas exposed to sunlight. (b) Norm.al brilliance of station identification markers shall be that level which is easily visible at a distance bf 2 feet from the marker under average office lighting condit
46、ions with the equipment located at a desk or normal working position. Minimum brilliance.shal1 be interpreted as the minimum level at which markings are easily readable at a distance of 18 inches from the marker in a completely darkened room. This level shall be determined after a dark adaptation pe
47、riod of 10 minutes. A continuous or step type control shall be incorporated to provide an even increase or decrease of illumination between the limits specified herein. The ION - OFF“ switch required for the signal indicators shall be incorporated as part of this control. 5 Licensed by Information H
48、andling ServicesMIL-1-24078 58 7737706 0442476 b MIL -1-2407 8( SHIPS) 3.21 Signal indicator lamps. - The release indicator lamp shall be located directly over the release switch. The call and busy indicator lamp shall be individually located over the station selector switches. Signal indicator lamp
49、s shall be subminiature, omnidirectional, red plastic dome using a type T-1-3/4 lamp. 3.22 Station identification. - This shaU be a durable, abrasive-resistant laminated plastic strip suitable for engraving. The laminations shall be opaque black and transluscent white. Guide lines shall be engraved on the marker to indicate the limits of the area to be engraved with the station designation. The engraved area shall be at a sufficient depth to expose the translucent white lamination. The marker shall be a single strip removable from the front of the equipment. 3.23 Rectifiers. - Silicon
