Setup and adjustment, P.a. volume knob – Code 3 MicroCom 2 Siren User Manual
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When using the 3992XAMP 2nd amplifier with the 3992 siren system the RLSEXP Modular
Expansion unit is required. Refer to the diagram on page 11 for interconnection details.
The 3992XAMP may also be used with the RLS 3997, 3998 and 3999 sirens by using the same
basic interconnection method shown on page 11.
SETUP AND ADJUSTMENT
All of the adjustments and setup switches are located on the amplifier unit. Make these
adjustments and set the switches to the desired position prior to securing the amplifier in it's final
mounting location. (see wiring diagram, page 15).
Audio Adjustments
Radio Rebroadcast Adjustment - Place the selector switch in the RADIO position. The trimmer
located on the rear panel of the siren sets the maximum level RRB will reach with the knob fully
clockwise. To adjust properly, set the volume knob fully clockwise and adjust the trimmer such that
normal two-way radio volume inside the vehicle produces 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 and adjust the trimmer
while keying the microphone until the maximum volume
out of the speaker is such that there is no feedback and is
intelligible.
Remote Input - The remote input can be configured to
accept either a positive +12V or negative GND ( Earth )
signal for actuation. All 3990 series sirens are shipped
setup to accept the GND (Earth) signal present on most
vehicles from the vehicle horn switch. To reconfigure the
Remote Input to accept a +12V signal the amplifier cover
must be removed (see exploded view, page 20). Move
both jumpers towards the "+ " position. Refer to detail "A"
for a complete illustration.
Siren Mode Selector Switch (located on the siren
amplifier, rear panel)
The siren has two distinct modes, Hit-N-Go and Scroll. Set
rear panel slide switch, Figure 2, to the desired mode by
sliding left or right. See operation section for a detailed
description of operation in each mode.
P.A. Volume Knob
This control adjusts the level of the P.A. audio produced
when keying the microphone and speaking into it. This control also controls the Radio Rebroadcast
level when in the " RRB " switch is on. (see SETUP, Radio Rebroadcast Adjustment).
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Figure 2
Amplifier Rear View
Hit-N-Go / Scroll Switch