1-1
SECTION I
CHARACTERISTICS
1-1. SCOPE OF THIS MANUAL.
This service manual describes the characteristics, specifications, installation, theory of
operation, and service and maintenance of the Federal Modulator Series Outdoor Warning
Siren speaker arrays.
1-2. GENERAL.
Federal Signal’s Modulator Series Siren products are a family of electronic sirens that
are capable of producing high intensity warning signals over a large area. The siren consists
of a speaker array (figure 1-1) and a control unit/battery box. A highly efficient design
enables the siren to produce a high sound level, while making moderate demands on the
power source.
1-3. SIREN DESCRIPTION.
Federal Signal’s innovative omnidirectional, electronic Modulator siren series consist of
aluminum modules that utilize four 100 watt drivers per module. The Modulator series is
available in several models which have the following sound output rating at 100 feet.*
MOD1004
106dBC
MOD2008
112dBC
MOD3012
115dBC
MOD4016
118dBC
MOD6024
121dBC
MOD6048
125dBC
*Based on measurements at 500 feet.
1-4. FREQUENCY RESPONSE.
The Modulator Series siren provides virtually flat frequency response from 200 - 2000
Hertz. This gives the siren the ability to produce loud and clear voice messages as well as the
ability to produce a full spectrum of warning tones.
1-5. FEATURES.
The siren features 360 degree omnidirectional operation with negligible variation in
sound output. However, with the addition of the MCTURBO option the sirens sound pattern
can become directional, increasing the sound output level 3dB in one of two directions. See
installation section for details. The Aerodynamic patented design minimizes wind loading
concerns. Advanced hyperbolic horn configuration provides an excellent range of frequency
response. Supplied with either pole or flat mount supports and lifting eye for easy
installation. See Section 3.
A Modulator Series control unit (MCP) is needed for complete operation.
Содержание MOD1004
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