A-A-50796A
c. Manual mode. This mode enables the operator to manually control the siren pitch.
This mode shall be marked as "MANUAL".
d. Wail mode. In this mode, the siren produces continuous automatic cycling of increasing and decreasing sound level as specified in 3.2(d). This mode shall be marked as "WAIL".
e. Yelp mode. In this mode, the siren produces a continuous automatic cycling of increasing and decreasing sound level as specified in 3.2(e). This mode shall be marked as "YELP".
3.2 Performance requirements. Siren sound pressure level requirements shall be verified in accordance with the methods specified in ANSI S1.13, "Measurement of Sound Pressure Levels in Air".
a. Sound levels. Measurements shall be made with 11-ohm, 75-watt speakers/drivers. b. PA sound output. All measurements shall be made using a 1 volt rms test tone at
1000 Hz (see 7.4). With one speaker, the minimum PA sound output shall be 112 decibels (dB)
at 10 feet. With two speakers, the minimum PA sound output shall be 116 dB at 10 feet.
c. Siren sound output. With one speaker, the minimum siren sound output shall be
114 dB at 10 feet. With two speakers, the minimum siren sound output shall be 118 dB at 10 feet. The siren output shall be a symmetrical square wave. The lowest fundamental frequency shall be between 250 Hz and 750 Hz. The frequency shall rise at least 900 Hz.
d. Wail. The siren shall produce a continuous automatic cycling of increasing and decreasing sound levels at a rate of 7-15 cycles per minute.
e. Yelp. The siren shall produce a continuous automatic cycling of increasing and decreasing sound levels at a rate of 100-225 cycles per minute.
f. Audio frequency response. The audio frequency response shall be flat within 3 dB
from 250 to 4,000 Hz, at rated power. The zero dB reference shall be measured at 1,000 Hz.
3.3 Identification markings. The amplifier boxes shall be permanently marked with the manufacturer's identification and the model designation in accordance with MIL-STD-130, "Identification Marking of U.S. Military Property". Drivers shall be marked to denote manufacturer, model, and power rating in accordance with MIL-STD-130.
3.4 Workmanship. The finished siren and individual accessories shall be free from burrs, slivers, sharp edges, dents, and fractures. All cords, cables and interconnecting wire harnesses shall be free from kinks, nicks, cuts, burned or melted insulation, and excessive solder wicking. Bolts, nuts and screws shall not be missing, loose, fractured, or stripped.
4. REGULATORY REQUIREMENTS.
4.1 Recovered materials. The offeror/contractor is encouraged to use recovered materials to the maximum extent practicable, in accordance with paragraph 23.403 of the Federal Acquisition Regulation (FAR).
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