KKK-A-1822 E
3.14.6 SIREN - PUBLIC ADDRESS SYSTEM.
A combination electronic siren with integral public address system and other upgrading features,
including radio interface capability, shall be provided. Dual speakers shall be installed, outside
the vehicle, in the bumper/hood area. Speakers shall not protrude beyond the face of the
bumper or bumper guards. The microphone shall be a noise canceling type. The siren's control
shall permit the following sounds, Manual, Wail, and Yelp. Other applicable sounds such as
"Rapid Yelp", "Air Horn" or composite type sounds, etc. may be specified (see 6.2-rr) or
furnished. The system shall provide plug-in connections and connecting cables; with control
capability from the passenger seat and driver's horn ring by means of a siren/horn switch or,
when specified (see 6.2-rr), by a foot switch; and all other necessary hardware for the siren/
public address operation. The public address amplifier shall be independent of the two-way
radio, except that a common microphone and control housing group may be employed. The
illuminated (in siren mode) "Horn/Siren" switch shall be provided on the driver's console, or the
siren may be switched automatically with the use of the emergency light switch.
The siren, with the exception of cancellation effects due to dual speakers, when tested in a full
anechoic chamber that conforms to ANSI Standard S1.13-1971, with test equipment and methods
conforming to California Administrative Code, Title 13, Article 8, shall be capable of producing
a continuous warning sound at a minimum level of 123 dB, A-weighted, at 3 meters (10 feet) on
axis in the "Wail mode" with "Yelp" falling within 1 dba with 13.6 volts +/- 1% input, at a
fundamental frequency in the range of 500 to 2,000 Hz maximum.
The output over the sweep range shall not drop to less than 116 dba. The speakers shall be
located in the configuration that is representative of the vehicle on which they will be
mounted.
In the "Wail" mode the siren shall have a sweep rate of 10-18 cycles per minute and in the
"Yelp" mode, a sweep rate of 150 to 250 cycles per minute. All sweep modes shall cover
a range of at least one octave.
In voice (P.A.) operation, the unclipped sine wave output shall be at least 55 watts RMS
into a resistive load matching the nominal speaker system impedance at 1000Hz. The
frequency response of the amplifier shall be from 500 to 3,000 Hz +/- 3 dB, when measured
from 1,000 Hz reference. Total harmonic distortion shall not exceed 10 percent, at 20
watts RMS, over the specified frequency range when measured with the load shown above.
In addition, the electronic siren furnished with the exception of cancellation effects
attributable to dual speakers shall comply to all the other requirements included in the
State of California Vehicle Code Section 1020 thru 1029, Title 13, Article 8, the latest
issue for Class A sirens. The electronic siren shall be tested, approved, and listed with
the Automotive Manufacturers Equipment Compliance Agency (AMECA).
3.14.7 AIR HORNS.
When specified (3.15.3-36) by the purchaser, air horn(s) shall be furnished. Horns shall be
activated as specified by the purchaser. Horn(s) shall be mounted forward of the cab
compartment.
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