Whelen BETA124R - Manual (Page 6)

Page 6
Operating the BETA
TM
Controls...
Power Switch
This switch has two positions: Down (Beta - Off) and Up (Beta -
On). When this switch is in the Off position, the Beta will not
function. When the switch is in the On position the siren is func-
tional and may be activated at the operator’s discretion. NOTE:
If the Beta is connected to the vehicle’s horn ring circuit, the
vehicle horn is disabled when the BETA
TM
power switch is in
the ON position. The horn ring will now function as a man-
ual siren switch.
Rotary Switch
The rotary knob controls the siren and PA (public address) functions of the Beta. There are 7 positions that
may be selected. Each position and it’s function is outlined below:
RAD (Radio Repeat) - When the rotary knob is in the RAD position, any signal that is received by the vehicle’s
two-way radio will be simultaneously broadcast over the vehicle’s loudspeaker (the Beta must be connected to
the two-way radio as outlined in this manual). This function overrides any other siren function.
PA (Public Address) - When the rotary knob is in the PA position, public address functions are operational.
Messages may be broadcast over the vehicle’s loudspeaker when the BETA
TM
microphone is in use. The
volume level of PA transmissions is controlled by the volume adjustment screw. If the horn ring is pressed
while the rotary knob is in this position, an airhorn siren tone will be generated by your vehicle’s loudspeaker.
This tone is generated until the horn ring button is released.
MAN (Manual Siren) - When the rotary knob is in the MAN position, pressing the horn ring generates a tone
that rises in pitch to a pre-set level. This tone is generated for as long as the horn ring is pressed. Please note
that the BETA
TM
microphone will override the siren function.
HF (Hands Free Operation) - When the rotary knob is in the HF position, the siren functions of the Beta are
placed in a stand-by mode. Siren tones are activated by a single “tap” on the vehicle’s steering wheel horn ring
button (if the vehicle’s horn has been wired to the Beta). The first tap produces a Wail tone (a steady, rise and
fall tone). A second tap produces a Yelp tone (a fast, rise and fall tone). A third tap produces a Piercer™ tone
(an extremely fast, rise and fall tone). The next tap returns the siren to a Wail tone and the cycle repeats itself.
Two quick, successive taps will stop the siren.
WAIL (Wail Tone) - When the rotary knob is in the WAIL position, a steady, rise and fall tone is produced. A
single tap on the vehicle’s steering wheel horn ring button (if the vehicle’s horn has been wired to the Beta),
changes the siren tone to a Yelp pattern (a fast, rise and fall tone). A second tap, and the siren returns to a
Wail tone. Please note that the Beta microphone will override the siren function.
YELP (Yelp Tone) - When the rotary knob is in the YELP position, a fast, rise and fall tone is produced. A
single tap on the vehicle’s steering wheel horn ring button (if the vehicle’s horn has been wired to the Beta),
changes the siren tone to TONE3. A second tap, and the siren returns to a YELP tone. Please note that the
Beta microphone will override the siren function.
TONE3 (Piercer TM Tone (In default configuration)) - When the rotary knob is in the TONE3 position, an
extremely fast, rise and fall tone is produced. Pressing on the vehicle’s steering wheel horn button (if the
vehicle’s horn has been wired to the Beta), changes the siren tone to a simulated air horn tone for as long as
the button is pressed. Releasing the button causes the siren to return to the Piercer tone. Please note that the
Beta microphone will override the siren function.
Volume Adjustment Screw
The volume adjustment screw controls the volume of public address function. Volume is increased by rotating
the adjustment screw in a clockwise direction. Rotating the volume adjustment screw in a counter-clockwise
direction decreases the volume produced by these features. The volume adjustment screw has no effect on
any siren tones produced.
POWER
ON
AIRHORN
SERIES
TM
R
BETA
MIC
VOL
RAD
PA
MAN
HF
WAIL
YELP
TONE3