1、28 MILP- February 15238D(SEIIPS) 1958 SUPERSEDING MILP-l5238C(sRIPs) 20 September 1956 MILITARY SPECIFICATION PUBLIC ADDRESS SET, TYPE AN/PIP-1( ) 1. SCOPE 1.1 This specification covers the design and construction of a public address set co Basic Design Requirements for. MIL-P-17555 - Preparation fo
2、r Delivery of Electronic Equipment (Except Rotat- ing Electrical FQuipment) and Associated Repair Parts. NAVY DEPARTMENT General Specifications for Inspection of Material. STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes. MIL-STD-108 - Definitions of and B
3、asic Requirements for Enclosures for Electric and Electronic Equipment. DRAWINGS BUREAU OF SIPS 9-E-4440-L - Receptacle Plug, SBM10 Ampere Double Pole. . with specific procurement functions should be obtained from the procuring agency or as directed by the contracting officer.) (Copies of specificat
4、ions, standards, drawings, and publications required by contractors in connection 3. REQUIREMENTS S. 1 Preproduction sample. - A specified number of preproduction samples, of the public address equipment furnished under this specification shall be submitted to a laboratory designated by the bureau o
5、r agency concerned for performance of the tests specified herein (see 4.2.1 and 6.1). - THIS DOCUMENT CQNTAIblS +!b PAGES. - O Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-3523D 5 m 7779706 0350275 4 m 3.2 General features. - The equipment s
6、hall be in accordance with the following paragraphs Of Specifi- cation MIL-1-983 in addition to the requirements specified herein: (Whenever a requirement of Specifica- tion MILI-983 conflicts with a requirement of this specification, the requirement of this specification shall govern. ) . General i
7、nformation Definitions Materiais, general Stressed or vital parts Substitution of (equal or superior) materials Fungus-inert materials Unacceptable materiais Acceptable materiais Flammable materials Arc-resistant materials Toxic materials Aluminum Magnesium Iron or steel Brass Bronze Copper Copper-b
8、eryllium alloy Copper-nickel alloy Nickel-copper alloy (Monel) Copper-nickel-zinc alloy (nickel silver and German silver) Zinc Other metals Springs (material) Plastics Ceramics Impregnating, filling, potting, embedding and encapsulating compounds Painting Protection against corrosion Bolts, machine
9、screws, studs and nuts Gaskets Locking devices Washers Parts-electrical-general Electron tube or capacitor sockets. Capacitors Variable resistors Transformers Relays Electrical tapes Batteries (see 3. 4.3.3) Switches Fuses (see 3. 5.17) Fuseholders and fuseclips Metallic rectif iers Enclosures-gener
10、al Enclosure-accessibility Enclosure - degree of (see 3.4.2.1. i) Stiffening grooves Minimum sheet metal thickness (water- tight enclosures) Through bolting stuffing tubes Ventilation Size (see 3.4. i) Threaded devices Rounded corners and edges Internal subassembly protection Drilled and tapped hole
11、s Welding Temperature and humidity Accelerated life Ehlt spray Shock, vibration and inclination (see 4.3.10) Primary power circuits (see 3.4.3.2.2 and Personnel protection Shielding atid radio frequency noise reduc- Electrical parts mounting Internal subassembly connection Terminal boards, connector
12、s and terminals Wiring Color coding Electrical insukition Dielectric strength and insulation resistance clearances Airborne audible noise Drawings - general Drawings - preliminary Drawings - working Schematic diagrams Wiring diagram Drawing list Assembly drawings List of onboard repair parts Drawing
13、s - manufacturers Bill of materials Interchangeability and standardization Technical manuals (see 3.8) Repair parts (see 3.4.4) Designation and marking Design for production Reports Workmanship and general examination (vital vibration not required) 3.4.3. 3) tion (see 3.5.19). 3.3 General requiremen
14、ts. - The equipment shall be rugged, lightweight, and portable, and shall be capable of amplifying the audio frequencies for transmitting intelligible speech over extended distances through high ambient noise levels. 2 o Provided by IHSNot for ResaleNo reproduction or networking permitted without li
15、cense from IHS-,-,-MIL-P-1523D 58 m 777970b 0350276 b MILP- 15238D(SHlPS) 3.4 Equipment composition. - The equipment shall consist of the following: (a) Electric megaphone. (b) Amplifier-battery assembly. . (c) Repair parts kit (with repair park and accessories). 3.4.1 Weights and dimensions. - The
16、maximum weights and dimensions of the equipment shall be as follows : (a) Electric megaphone. - Weight - 5-1/2 pounds. Height - 13-1/2 inches. Length - 14-1/2 inches. Horn mouth diameter - 12-1/2 inches. Weight - 22-1/2 pounds. Height - 12 inches. Length - 10-1/2 inches. Width - 6-1/2 inches. Weight
17、 - 70 pounds. Height - 9 inches. Length - 22 inches. Width - 14 inches. () Amplifier battery assembly (complete with amplifier and battery). - (c) Repair paris kit (with repair parts and accessories). - 3.4.1.1 Minor dimensional changes that do not involve changes in component volumes may be made. I
18、- 3.4.2 Electric megaphone. - The electric megaphone assembly shall consist of the following integral components: (a) Microphone and microphone housing. () Horn assembly. (c) Operating handle. (d) Carrying handle. (e) Connecting cable. 3.4.2.1 Microphone housing. - The microphone housing is the rear
19、 metal detachable portion of the megaphone assembly and shall consist of the following parts: (a) Gab control. (II) Rubber mouthpiece. (c) Microphone screen. (d) Connecting cable entrance. 3.4.2.1.1 The microphone housing shall be watertight, and shall be attached by means of screws threaded into me
20、tal inserts on the driver head plate. trol knob is located below the microphone unit and easily accessible from either side. housing and shall be large enough to prevent physical contact between the operators face and any metal portion of the microphone housing when talking into the megaphone. allow
21、 easy removal. A holding groove on the housing to accommodate a projection on the mouthpiece, or vice-versa, is permissible. No screws or similar attaching devices shall be permissible. 3.4.2.1.2 Gain control location. - The gain control shall be so located within the housing that the con- 3.4.2.1.3
22、 Rubber mouthpiece. - A rubber mouthpiece shall be provided on the microphone end of the 3.4.2.1.4 Attachment of mouthpiece. - The mouthpiece shall be secured to the housing in a manner to . 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-152
23、3BD 58 7777706 0150277 B I MIL- P- 15238D(SHIPS) 3.4.2.1.5 Microphone screen. - The microphone face shall be?protected by a metal screen. 3.4.2.1.6 Meqaphone microphone unit. - The megaphone microphone unit shall be of a %ontrolled reluctance? type. 3.4.2.1.7 Microphone cushion. - The microphone uni
24、t shall becushioned in an acoustical absorbent material, such as sponge rubber, to damp out audio frequencies being transmitted through the metal horn and rear housing of the electric megaphone assembly to the microphone unit. the coordinate axis of the horn driver assembly. The exact microphone loc
25、ation should be a compromise between decreasing the acoustical feedback and increasing the visibility of the operator while using the megaphone. 3.4.2.1.8 Microphone positioning. - The microphone shall be offset upward in the vertical plane from 3.4.2.2 Horn assembly. - The horn assembly shall consi
26、st of the following components: (a) Horn unit. (b) Magnet structure. (c) Voice coil and diaphram assembly. (d) Driver head plate, and annular plug (if required). 3.4.2.2.1 Horn unit. - The horn unit may be either of a straight or re-entrant design. 3. 4. 2. 2.2 Magnet structure. - ,The magnet struct
27、ure shall be of the ?W? type. 3.4.2.2.2.1 Air gap clearance. - Mirhum air gap clearance on either side of the voice coil assembly shall be O. 007 inch. 3.4.2.2.2.2 Serviceability. - Removal of the magnet structure as a unit together with the voice coil and diaphragm assembly shall not expose the mag
28、netic gap. 3.4.2.2.3 Voice coil and diaphragm assembly. - The voice coil and diaphragm assembly shall be readily replaceable without necessitating cementing or soldering. . 3.4.2.2.3.1 Protection and positioning. - The voice coil and diaphragm assembly shall be provided with facilities which perform
29、 the following functions: (a) Permit accurate and positive positioning of the voice coil in the air gap. (b) Prevent damage to the voice coil while being inserted into or removed from the magnet (c) Prevent damage to the voice coil if assembly is laid on a flat surface. (d) Permit insertion into the
30、 air gap in only one position. structure. 3.4.2.2.3.2 Diaphragm material. - The diaphragm shall be of a molded phenolic material. 3.4.2.2.4 Driver head plate and annular plug assembly. - The driver head plate and annular plug assembly is that part of the driver unit to which the magnetic structure i
31、s secured. The assembly shall be of molded phenolic material. The use of an annular plug is optional. and microswitch. The handle shall be secured to themegaphone unit as near as possible to the center of gravity. located on the operating handle SO that the forefinger and middle finger of either han
32、d may cover the trigger when grasping the handle during normal use. 3.4.2.3.2 Switch. - A microswitch, or equivalent, shall be used which when depressed shall complete the relay circuit specified in 3.5.16. 4 3.4.2.3 Operating handle. - The operating handle shall be a pistol grip type handle includi
33、ng a trigger 3.4.2.3.1 Trigger. - A spring operated trigger type mechanism shall be used. The trigger shall be O Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-1523D 58 W 7779706 0350278 T 3.4.2.3.3 Drainage. - Facilities shall be provided to
34、permit drainage of any moisture from the operat- 3.4.2.3.4 Megaphone mounting wedge. - A mounting wedge shall be provided covering the bottom por- 3.4.2.4 Carrying handle. - A carrying handle shall be provided on the top portion of the megaphone ing handle. tion of the operating handle for attaching
35、 the megaphone assembly to the amplifier-battery cabinet. assembly for carrying the electric megaphone and amplifier-battery assembly. The handle shall be posi- tively secured to the megaphone unit. 3.4.2.5 Connecting cable. - A light rubber or plastic covered 6-foot cable consisting of 3 pairs of s
36、hielded, twisted, stranded conductors shall emerge from the microphone housing and shall terminate in a plug suitable for connection to the amplifier-battery cabinet. 3.4.2.5.1 Connecting cable attachment. - The connecting cable shall be securely attached to the rear housing. 3.4.3 Amplifier-battery
37、 assembly. - The amplifier-battery assembly shall consist of the following components: (a) Amplifier-battery cabinet. (b) Audio amplifier unit. (c) Battery supply. 3.4.3.1 Amplifier-battery cabinet. - The amplifier-battery cabinetshall consist of two individual enclosures and a separator which when
38、latched together form one unit. battery cabinet which serves as the enclosure for the audio amplifier unit. The bottom of the amplifier section shall be open when the cabinet is disassembled. When assembled with the separator, the amplifier section shall be watertight. 3.4.3.1.2 Battery section. - T
39、he battery section shall be the lower portion of the amplifier-battery cabinet which serves as the enclosure for the battery. The top of the battery section shaL1 be open when the cabinet is disassembled. When assembled with the separator the battery section shall be splashproof in accordance with S
40、tandard MILSTD-108. 3.4.3.1.1 Amplifier section, - The amplifier section shall be the upper portion of the amplifier- 3.4.3.1.3 Cabinet separator. - The cabinet separator shall consist of the base of the amplifier section and the top of the battery section separated a distance of at least 1/4 inch b
41、y four or more spacing studs. Studs shall also be provided to enable the transfer of energy between the amplifier and battery sections, The separator shall be so arranged that there will be no available path between the amplifier and battery sections for the transfer of hydrogen gas that does not in
42、clude passage through the atmosphere. Substantial terminals shall be located on the top of the battery section for connection to the battery terminals and a two- bladed spring type connector receptacle shall be mounted on the amplifier base portion for connection of the 6-volt supply to the amplifie
43、r. 3.4.3. 1.4 Amplifier section facilities. - 3.4.3.1.4.1 Meqaphone receptacle. - A receptacle, cannon shell type GK, or equivalent, shall be 3.4.3.1.4.2 Remote microphone and charging receptacle. - A second receptacle cannon shell type GK, provided on the amplifier section to accommodate the megaph
44、one cable plug. or equivalent, shall be provided on the amplifier section to accommodate both the charging able plug and the remote microphone cable plug. This receptacle shall have either a different pin configuration than the megaphone receptacle or, should the pin configuration be identical, the
45、pins shall be wired in a manner to prohibit detrimental effects to the equipment caused by switching of plug. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-P-15238D 58 777770b 0350277 1 3.4.3.1.4.3 Remote microphone gain control. - A gain con
46、trol shall be provided on the amplifier sec- tion for controllins the output of the system when employing the remote microphone. The action of this . control shall be specified in 3.5.6, 3.4.3.1.4.3.1 Knob adjustment. - A knob shall be provided on the gain control shaft to provide for use in adjusti
47、ng the output of the system. 3.4.3.1.4.4 Instruction plate. - An instruction plate explaining operating technique for the system shall be provided on the amplifier section. 3.4.3.1.4. 5 Location of facilities. - The two receptacles, the gain control knob, and the instruction plate shall be located a
48、t one end of the amplifier section. The receptacles shall be mounted side by side near the top of the enclosurewith the control knob in between. The instruction plate shall be mounted below the receptacles. The usage of each facility shall be identified by the marking of a plate or plates adjacent t
49、o the facility. 3. 4.3.1.4.6 Carrying handle. - A carrying handle shall be provided on the top of the amplifier section. 3. 4.3.1,4. 6.1 Carrying handle fastening attachment. - The handle shall lie flat on the top of the ampli- fier section when the megaphone assembly is attached to the amplifier section. The handle shall be spring loaded to hold it in place. shall be provided on top of the amplifier section to match with the mounting wedge on the megaphone handle. 3.4.3.
