SECTION V - SIREN/PA SYSTEM
Operating Models 280K & 480K
STANDARD & OPTIONAL FEATURES
1. All models perform essentially the same in that a Master
Switch turns the siren on and controls the vehicle horn ring.
The horn ring and Unitrol rotary switch control siren sounds.
2. Other features include warning light control (most
models) , air horn, public address, power control for two-way
radio, power jack, panel light, and indicator lights.
3. Optional connections or equipment can include:
a) Rocker Accessory Switch
b) Intrusion Alarm - See Section VIII
c) Two-Tone Siren sounds - See Section X
RADIO POWER CONTROL
1. The two-way radio may be left “on” at all times.
The rotary switch keeps it ignition-controlled in
MAN, WAIL, YELP,
and
HI-LO
settings.
2. In RADIO setting, power to the radio is
automatically switched to battery-direct so calls
can be transmitted and received without ignition
keys.
SIREN & WARNING LIGHT CONTROL
1.
Model 280
- Middle toggle position turns siren on, horn
ring or spring-loaded. Right toggle position controls siren
as described below.
2.
Model 480
- Lever position 1, 2, & 3 turn on warning
lights. Lever position 3 turns on siren. Horn ring controls
siren as described in next item.
3. The vehicle horn ring controls siren as follows:
During
MAN
: Siren rises and falls only as horn
ring is manually pressed and released.
During
WAIL
: Horn ring activates 5-second Yelp.
During
HI-LO
: Horn ring activates 5-second Hetro.
AIR HORN & SIREN TEST
1.
Model 280
- Air horn operates by pressing miniature
pushbutton switch.
2.
Models 480
- Air horn operates by pressing miniature
toggle switch to
“HRN”
. Siren operates without warning
lights by pressing toggle to
“TST”
.
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MICROPHONE PA
1. PA system operates by pressing microphone button.
Siren, if operating, stops until button is released.
2.
“K”
models use a separate microphone for PA.
3.
“KR”
models use a radio microphone for PA.
Microphone is controlled by lighted pushbutton
switch:
OUT
(unlighted) - Microphone controls radio.
IN
(lighted) - Microphone controls PA system.
RECORDED TAPE PA
1. Recorded announcements can be played over PA
system by setting rotary switch in RADIO and
plugging headphone outlet of cassette player into tape
jack at lower right. Jack is not available in models using
the radio microphone for PA.
See Section XI for plug wiring.
RADAR POWER JACK
1. 12V power can be supplied to any device drawing less
than 18 amperes. See Section XI for plug wiring.
OUTSIDE RADIO CALLS
1. Incoming radio calls are amplified over the outside siren
speaker when the rotary switch is set on RADIO. Loudness
is regulated by the inner rotary switch knob as well as the
radio’s volume control.
