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S
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U
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Ut-4
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Ut-6 i
ntercomS
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5
Do not use crimp type splices. They can become intermittent over
time. Use a good quality electrical tape, or better yet, use heat shrink
tubing to cover the soldered connections. The connections to the
headset jacks and PTT switches will also have to be soldered. See
Figure 3 for jack terminal identification.
We also do not recommend using screw type terminal strips for
intercom connections. There have been several instances where
terminal strips introduced high levels of electrical noise like alternator
whine into the intercom system. It is acceptable however to tie the
intercom red and green power wires to existing vehicle terminal strips.
The best place to run the wiring between the unit and the jack and
PTT switches is out of sight. It should be run behind vehicle panels
and/or up in the headliner. This will reduce the chance of personnel
or equipment catching on or damaging the wiring. Wire routing
should take into account normal vehicle operations. Wires should
not interfere with any of the vehicle’s controls, compartments, or
doors. If the vehicle’s cab tilts up for engine servicing, run wiring
along the existing vehicle wiring bundle. Make sure that wiring does
not interfere or restrict the tilting operation. Also, make sure that the
tilting operation will not cut or sever the wiring.
Make sure that the wiring does not rest on sharp edges. Over time
the vehicle’s vibration may cause a sharp edge to cut into the wire.
Use the provided wire grommets wherever the four conductor wire
goes through the hole into a jack box. Use wire ties or tie wraps to
secure and strain relieve the wire.
At this time do not put the covers on the jack boxes or tighten up
the PTT switches. You will need to verify the correct operation of the
system before you close everything up.
Power Connections:
The UltraSound unit will run on 11-16 VDC. CAUTION: UltraSound units
are designed for negative ground vehicles only. They can be used on
positive ground vehicles only if a Sigtronics Positive Ground Adapter
is used. Contact your Sigtronics dealer on pricing and availability.
Make sure that the vehicle power is turned off before connecting the
UltraSound power wire. The power for the UltraSound unit comes in
on the red and green wires on the Headset Jack and PTT Switch Cable.
Connect the red wire to vehicle power. (Try not to use a power buss
that also runs electrical motors such as fans or light bars with rotating
lights.) Connect the green wire to the vehicle chassis ground.
FIGURE 4
SPEAKER HI
(2) VIOLET
NOTE 1
SPEAKER LO
(3) VIOLET
NOTE 1
PTT HI
(5) WHITE
NOTE 2
MIC LO
(4) BLACK
MIC HI
(1) BROWN
PTT LO
(6) WHITE
NOTE 2
123
RADIO 1
UT-4S/6S (SINGLE RADIO) WIRING DIAGRAM
NOTES:
1) CONNECT EITHER VIOLET WIRE TO THE RADIO SPEAKER HI OUTPUT. CONNECT
THE REMAINING VIOLET WIRE TO SPEAKER LO.
2) CONNECT EITHER WHITE WIRE TO THE RADIO PUSH-TO-TALK (PTT) KEY LINE INPUT.
CONNECT THE REMAINING WHITE WIRE TO THE PTT KEY LINE RETURN (PTT LO).
3) USED ON UT-6S UNITS ONLY.
(7) RED
+11 to +16
VOLTS DC
FUSE
(1 AMP)
CHASSIS
GROUND
(12) GREEN
(2) WHITE / RED
(1) WHITE / BLACK
(10) WHITE / BLUE
(11) WHITE / ORANGE
(9) TAN
(3) BLUE
(8) TAN
(4) BLACK
(11) WHITE / ORANGE
(10) WHITE / BLUE
(13) TAN
(14) WHITE / BROWN
(15) YELLOW
NOTE 3
NOTE 3
NOTE 3
P1
J1
J2
P2
PTT SWITCH
TIP
BARREL
RING
HEADSET JACK
PASSENGER
BARREL
HEADSET JACK
DRIVER
PTT SWITCH
RING
TIP
RING
TIP
BARREL
HEADSET JACK
CREW #1
TIP
RING
BARREL
HEADSET JACK
CREW #2
HEADSET JACK
DRIVER’S AUXILIARY
RING
BARREL
TIP
PTT SWITCH
RING
TIP
HEADSET JACK
CREW #3
NOTE 3
BARREL
HEADSET JACK
CREW #4
NOTE 3
BARREL
TIP
PTT SWITCH
RING
INTERCOM UNIT
UltraSound
INTERCOM
R
