Introduction
8
PA4000 Electronic Siren System
Federal Signal
www.fedsig.com
Introduction
The Federal Model PA4000 is a precision built, efficient and economical full-featured
electronic siren of advanced design. It provides wail, yelp and priority siren tones,
as well as the Tap II feature, public address (PA), radio rebroadcast and an air horn
sound.
The siren may be installed in negative ground vehicles with 12-volt electrical systems.
It is protected against failure modes (including reversed polarity) by a fuse that is
replaceable without tools. No components protrude from the bottom of the siren to
interfere with mounting arrangements.
The siren is made up of an Amplifier and a Control Head. The Amplifier is suitable for
mounting in a dry, adequately ventilated location, while the Control Head is designed
for flush mounting in the vehicle interior. Communication between the two units is via
an RJ45 telephone connector.
A noise cancelling microphone is wired in to prevent loss or theft. It provides high
quality voice reproduction without feedback (squeal). The microphone push-to-talk
switch overrides any siren signal for instant PA use. PA and radio volume are preset at
the factory for maximum gain.
The Model PA4000 is designed to drive one or two 100-watt speakers. Using two
100-watt speakers will provide maximum traffic clearing power.
The Tap II feature allows the driver to change the siren sound via the vehicle’s horn
ring or any remotely mounted switch.
A horn ring switch allows the driver to determine the function of the horn ring. LEDs
indicate when the vehicle horn is disabled and the horn ring is controlling either Tap II
or the air horn tone.
Other special features of the Model PA4000 include:
• High degree of reliability is achieved through the use of a CMOS microprocessor
and silicon output transistors.
• Control panel is illuminated with non-glare lighting.
• Newly designed printed circuit board provides improved performance and
durability under a wide range of environmental conditions.
• AUX/OUT can drive an external relay for controlling other devices, such as
warning lights.
• AUX/IN input can activate wail when the siren selector is in the manual position.
• Park-Siren Deactivator can deactivate siren tones when the vehicle is shifted into
PARK.
• A diagnostic capability for speaker testing uses two LEDs for visual indication and
four test tones for audible indication.
