4
SECTION I
GENERAL DESCRIPTION
Figure 1-1. Model PA4000 Electronic Siren.
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 PA4000NY-HiLo has a HI-LO
tone replacing the priority tone.
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.
