A-A-50796A
3. SALIENT CHARACTERISTICS.
3.1 Design and construction. The siren shall be of compact design and sufficiently rugged to withstand shock and stress incidental to use on an emergency response vehicle.
3.1.1 Overall Dimensions. The maximum overall dimensions of the amplifier, including the mounting bracket, shall be not more than eight inches wide, five inches high, and nine inches deep.
3.1.2 Materials. The amplifier housing shall be made of 18 gauge steel or heavier to provide strength and electromagnetic shielding. Metals used in the manufacture of the siren equipment shall be either corrosion resistant or treated to prevent corrosion. The use of dissimilar metals, especially brass, copper, or steel in intimate contact with aluminum or aluminum alloy shall be avoided. Protective coatings which will crack, chip, peel or scale with age shall be avoided. When materials are used that are nutrients for fungi and they are not hermetically sealed, they shall be treated with a fungicidal agent. The siren shall be wired with a type of wire which conforms to MIL-DTL-16878/1, "Wire, Electrical, Polyvinyl Chloride (PVC) Insulated, 105 °C,
600 Volts (Not for Navy Shipboard Use)".
3.1.3 Components.
3.1.3.1 Amplifier bracket. The amplifier assembly with mounting bracket shall be designed for mounting above or under the dashboard. The amplifier mounting bracket shall allow the amplifier to be readily removed for repair purposes.
3.1.3.2 Power indicator. The amplifier's front panel illumination and/or power-on indication shall be by a non-glare pilot light.
3.1.3.3 Power switch. The amplifier's power shall be controlled by an on-off switch located on the volume control, or by a separate on-off switch.
3.1.3.4 Microphone. The microphone shall be a magnetic or noise cancelling carbon type.
3.1.3.4.1 Microphone cord. The microphone cord shall be the coil type and shall have an extended length of 8 feet ±1 foot.
3.1.3.5 Speaker system elements. Speakers and mounting brackets, when mounted on the exterior of the vehicle, shall be able to withstand a relative wind velocity of 100 miles per hour.
3.1.3.5.1 Speaker brackets. The speaker mounting bracket shall be designed to position the speaker on the vehicle centerline (if one speaker). The speaker bracket shall be designed in such a manner as to prevent easy removal by vandals.
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