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Sigtronics Emergency Unit Radio / Music Switcher
Installation and Operating Instructions Models SRS-4, SRS-6 and SRS-12
Emergency Radio Switcher Features
The Emergency Radio Switcher allows AM / FM radio to be
heard whenever intercom and / or mobile radio communications are not occurring. Great for monitoring traffic and
weather reports, AM / FM radio will not be heard over mobile
radio, it will automatically be muted when communications
occur.
For Use With
Sigtronics UltraSound (US) systems
Installation
Attach the Radio Switcher in a convenient location using the
adhesive mounting strips. See table below and diagram on
page 2 to connect the wiring harness.
1. Unplug the P1-J1 connectors of the intercom and plug the
Music Switcher in line.
Common Ground Music
Source
Right Violet Right + Violet
Common Orange / Green Right – Orange
Left Gray Left + Gray
* IMPORTANT: In a floating ground music system, NEVER con-
nect any of the four output wires together or to ground !
Floating Ground Music
Source *
Left – Green
2. Connect the cable in the kit to the remaining connector
on the Music Switcher. Connect the RED wire to the music
ON/OFF switch center lug. Connect to +12 Volts through
the switch and fuse as shown in the drawings.
3. Depending on whether your music source has a common
ground output or floating ground output, connect it as
shown in table.
Operating Instructions
1. With music source turned OFF, adjust the intercom as
described in intercom system instructions.
2. Turn ON the music source and the music ON / OFF switch,
if equipped. During periods when there is no communications radio traffic and no one is speaking on the intercom,
the music source will be switched into the headphones.
Adjust the volume on the music source for a comfortable
volume level.
Warranty: One year parts and labor.
Standard Equipment Included
Part Description Part Number Quantity
Cable, SRS, 5 Conductor,
Switch, SPST with Fuse
Foam, Double Sided 100720 2
800088 1
Made in the U.S.A.
Specialists in “SOUND” Management
178 East Arrow Highway, San Dimas, CA 91773 ( 909 ) 305-9399
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the music source outputs to chassis or vehicle frame.
3. Connect the Violet and Orange wires to the right channel + and – output of the music source.
Connect the Gray and Green wires to the left channel + and – output. Do no t connect any of
Notes:
1. Unplug P1–J1 of UltraSound unit and plug the music Switcher inline.
2. Connect the Red wire to +12V power through the music On / O switch and fuse as shown.
Radio / Music
UltraSound
INTERCOM
BOTH
VOLUME
SQUELCH
AUTO
RADIO 2
RADIO
TALK LISTEN
RADIO 1
UltraSound
R
Emergency Unit Radio / Music Switcher Installation Drawing
Speaker
Output
Note 3
Right + Violet (J3–5)
Right – Orange (J3–4)
Left + Gray (J3–2)
Left – Green (J3–1)
Models SRS-4, SRS-6 and SRS-12
Note 1
SRS-4, SRS-6 or SRS-12
Radio Switcher
178 East Arrow Highway
San Dimas, CA 91773
E-mail: info@sigtronics.com
Web Site: www.sigtronics.com
Sigtronics Corporation
Phone: (909) 305-9399
P3
J3
Red (J3–7) Connect to Center Lug of Switch
On / O
Switch
Music
Note 1
To Headsets
(1 AMP)
Fuse
+11 to +16 VDC
Power Buss
To Vehicle
Note 2
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3-11-2013 srsinstr.pdf
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