SmartSiren Platinum Convergence Network
Federal Signal www.fedsig.com
Setting the Gain for Radio Rebroadcast and PA
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Figure 19 Gain control for radio rebroadcast (siren amplifier/relay module)
Radio Rebroadcast
Gain Control
Setting the Gain for Public Address (Microphone Volume)
The PA gain control port on the front of the siren amplifier is for select models that
require the microphone to be connected to the siren.
To adjust the PA gain:
1. Stand outside the vehicle in an enclosed area and press the push-to-talk button
on the control head microphone. Speak into the microphone in a normal tone
of voice.
2. If the speaker volume is too loud or too soft, insert a small screwdriver in the
PA gain control port (
PA VOL
) on back of the control head. See Figure 20. Turn
it clockwise to increase the volume until audio feedback (squeal) occurs or
counter-clockwise to decrease the volume.
NOTE: Audio feedback depends upon the microphone gain, open windows,
speaker placement, and the proximity of reflecting surfaces such as walls,
buildings, or other vehicles.
Figure 20 Gain control for PA (amplifier/relay module)
PA Gain Control
3. To adjust the PA gain further, insert a small flat-head screwdriver in the PA gain
control port (
PA VOL
) on the back of the control head. See Figure 21. Turn it
counter-clockwise while speaking into the microphone to increase the gain to
just below the point where audio feedback occurs.
Figure 21 Gain control for PA (control head)
PA Gain Control
(Mic Volume)
290A7558
To Microphone
To Convergence Network
