Code 3 Scorpion Siren - Manual (Page 6)

6
WARNING!
WARNING!
!
Figure 4 - Horn Ring Jumper
Configuration re
Set-Up and Adjustment
The only adjustments necessary for the 3930 series sirens are Maximum P.A. Adjustment (accessible from
the front of the unit), and Maximum RRB Adjustment (accessible from the rear of the unit). Refer to Figure
3 for the location of these adjustments. The Horn Ring (Remote) input polarity is configured at the factory to
respond to a GND (Earth) signal. Refer to the procedure described under Horn Ring (Remote) Input
Configuration if your application requires that this input respond to a positive signal. Make these adjustments
prior to placing the unit inside the bail bracket.
Audio Adjustments
Maximum Radio Rebroadcast (RRB)
Adjustment - This trimmer (located on the rear
of the siren) sets the maximum level that the 2-
way radio will reach with the front panel
VOLUME control in the fully clockwise position.
To adjust properly, set the 2-way radio volume
control to produce normal radio volume inside
the vehicle. Slide the RRB switch to the right to
enable the RRB function. Next set the siren's
front panel VOLUME control knob fully clockwise
and adjust the rear panel RRB trimmer to
produce the desired volume outside the vehicle.
Maximum P.A. Volume Adjustment - This
trimmer ( located on the front panel next to the
volume control knob ) sets the maximum level
that the P.A. volume will reach with the front
panel VOLUME control in the fully clockwise
position. To adjust properly, set the front panel
volume control fully clockwise. While keying the
microphone hold the microphone close to your
lips and speak directly into it in a normal voice
and adjust the trimmer until the maximum
volume out of the speaker is intelligible and
produces no feedback.
Horn Ring (Remote) Input
Configuration - The remote input can be
configured to accept either a positive
+12V or negative GND (Earth) signal. All
3932 sirens are shipped set-up to accept
the GND (Earth) signal from the vehicle
HORN SW present on most vehicles. To
reconfigure the siren to respond to a
+12V signal, remove the siren from it's
case ( see assembly explosion, page 13)
and move the configuration jumper to the
"+ " position. Refer to Figure 4.
MAXIMUM RRB
Adjustment
Rear View
Figure 3 - Adjustments
MAXIMUM PA Adjustment
Any electronic device may create or be affected by electromagnetic interference. After
installation of any electronic device, operate all equipment simultaneously to insure
that operation is free of interference.