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Page 6 of 8 SA-500-20 28 Volt Installation and Operating Instructions
05/07/05 CP4930B
OPERATION
GENERAL
This unit is designed for easy operation under the stress associated with high-speed pursuit.
Most siren functions are accessible with one simple motion without repetitive activation of
switches or automatic timed switching that can interfere with desired operation.
SELECTOR SWITCH
The rotary selector switch controls the primary operating
mode of the siren.
Yelp - A rapidly changing tone used in congested areas.
Wail - A slower changing tone used on highways.
Stby - A silent mode that allows Manual, Horn and Public
Address operation.
Radio - Also known as Radio Repeat, this mode amplifies
a radio speaker input for re-broadcast outside the vehicle.
No siren tones or PA operation are available in this mode.
MAN/PHSR
This momentary push-button switch provides a very rapid changing tone (Phaser) when the selec-
tor switch is in the Yelp or Wail positions. This tone is used at intersections and very highly con-
gested areas. Pressing the button once changes to the Phaser tone and pressing again changes
the tone back to Yelp or Wail.
With the selector switch in the Stby position this switch
provides Manual siren tone control, rising when pressed
and falling when released. This is used to momentarily
alert motorists or in low noise areas.
Phaser may be replaced by Two-Tone or disabled.
See OPTION SWITCHES section.
HORN
This momentary push-button switch provides a simulated air-horn tone while pressed. This can
be used to supplement the normal vehicle horn and is useful at intersections or in low noise areas.
This tone overrides other siren tones. Horn may be disabled. See OPTION SWITCHES section.
MICROPHONE
The attached noise-canceling microphone is used for public address operation and overrides any
siren tone when the button on the side (PTT) is pressed.
VOLUME CONTROLS
Controls are provided for radio repeat volume and public address
volume. These should be set when the vehicle is parked. Set
the RAD volume with the selector switch in the Radio position
and the radio volume set to desired level. Set the PA volume to
the maximum level with no feedback (squeal).
AUXILIARY INPUT
During installation an auxiliary input may be connected to the horn ring or other switching device.
It provides the same operation as pressing the Horn button or optionally the Man/Phsr button.
CUTOUT
During installation, a cutout input may be connected to a door switch. It turns off any siren tone
when the door is opened. The siren tone will continue to be cut off even when the door is closed.
Changing any switch or input will restore normal function.
HORN RING CYCLER 2 (Optional)
Available while selector switch is in standby, repeatedly tapping the horn ring or other switch will
cycle through Wail, Yelp, and Phaser tones. Tapping the horn ring twice quckly will stop siren
tones. Holding the horn ring produces horn. See OPTION SWITCHES section for further details.
MAN/PHSR HORN
VOLUME
RAD PA
H L H L
YELP
WAIL
STBY
RADIO
Sound Hazard
- Sound level from siren speaker (>120dBA @ 10 feet) may cause hearing damage.
Do not operate siren without adequate hearing protection for you and anyone in immediate vicinity.
(Ref. OSHA 1910.95 for occupational noise exposure guidelines)