19505P-43 (10-15)
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©2015 David Clark Company Incorporated
INSTALLATION/OPERATION INSTRUCTIONS
U3800 MASTER STATION
DESCRIPTION
The U3800 Master Station is the heart of the David Clark Company Series 3800 Intercom
System. The 3800 adjusts automatically for 12 or 24 VDC power source. It contains system
on/off and volume controls, power input and a remote output, system fuse, plus 2 headset jacks.
INSTALLATION
1. Select a mounting location where the headset cord will not interfere with the operator's job
function or otherwise force actions that may jeopardize safe operation.
WARNING
Caution should be taken with the U3800 when selecting a mounting
position so that it's at least 2 feet away from the transmitter antenna.
2. Mount the U3800 by placing one grommet between each of the four mounting brackets and
the mounting surface. Grommets are provided with the module but fasteners are not. The
type of fastener selected should be based on mounting location.
3. A C3820 Power Cord, twenty feet in length, is required to connect a U3800 Master Station
to it's power source. The stripped and tinned end of the C3820 incorporates a fuse holder
with a 2 amp slo-blow fuse. If connecting to a vehicle's power source, consideration should
be given to whether you connect before or after the ignition switch. The red wire should be
connected to DC positive (power) and the black wire should be connected to DC negative
(ground). Connect the two pin (male) connector of the negative (ground). Connect the two
pin (male) connector of the power cord to the power input connector located on the Master
Station.
NOTE:
It is recommended that a Noise Suppression Kit, such as
Radio Shack P/N 270-030 or equivalent, be installed on the
power line to the U3800 Master Station to help prevent
electrical noise from entering the intercom system. Install
the filter at the point where power is derived.
4. All cords have military type screw-on connectors. Install cords as follows:
a. Align key-way slot on cord connector with key in threaded connector on module.
b. Insert pins into socket until firmly seated.
c. Hand tighten swivel nut on cord connector.
5. Connect Master Station to Remote Modules using (C38-XX) Jumper Cords of desired
length.
