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DESCRIPTION
Model U3816 Dual-Radio Interface Module is designed to interface two mobile radios to a Series 3800 Intercom
system. Model U3816 provides two connections to mobile radios, two intercom system connections, two remote
push-to-talk (PTT) connections (corresponding to each of the mobile radios), a headset jack to accept a Series 3000
Headset, a Headset Listen Level Control, two Radio Receive Level Controls (corresponding to each of the mobile
radios), and two Radio PTT switches (corresponding to each of the mobile radios.)
The U3816 can be configured in one of two ways:
Standard: Radio receive audio is heard by all parties on the 3800 system
Radio-Isolated: Radio receive audio is heard only by the user of the U3816
INSTALLATION
1.
Mounting
a)
Select a suitable mounting location that will provide clearance for the U3816 and all necessary
connections. Model U3816 should be located such that the Operator's headset cord will not interfere
with the Operator's job function, or obstruct their visibility. Consideration should be given to the
accessibility of the PTT switches on the top of Model U3816, as the Operator should be able to
reach these easily.
b)
Select an appropriate fastener based on mounting location and surface type (fasteners are not
included with the U3816).
c)
Place a grommet between each of the four mounting brackets and the mounting surface
(grommets are included with the U3816).
d)
Insert the fasteners through the four mounting brackets, and the grommets.
e)
Tighten the fasteners until the grommet begins to compress.
DO NOT OVER-TIGHTEN THE FASTENERS
2.
Connections
a)
Connections are made using cords having MS type, screw-on connectors. These connectors mate
as follows:
i)
ii)
iii)
b)
Connect the U3816 to the radios using Model C3821 Radio Interface Cords.
i)
ii)
iii)
19519P-54 (01-20)
INSTALLATION / OPERATING INSTRUCTIONS
MODEL U3816 DUAL-RADIO INTERFACE MODULE
Align key-way of cord mounted connector with key of module mounted connector.
Insert cord mounted connector to module mounted connector until firmly seated.
Hand tighten swivel nut of cord connector. DO NOT OVER-TIGHTEN.
Cut the C3821 Radio Interface Cord to the proper length.
Connect the male, six pin, MS connector on the C3821 to the Radio Input connector on the
U3816.
19519p-54
Connect the stripped end of Model C3821 Radio Interface Cord to the radio (consult the
radio's service manual for proper hook-up of Model C3821 Radio Interface Cord as the
exact hook-up will vary depending upon the Make and Model of Radio used.)
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2020 David Clark Company Incorporated
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Table of Contents
Summary of Contents for David Clark U3816
- Page 1 Model U3816 should be located such that the Operator’s headset cord will not interfere with the Operator’s job function, or obstruct their visibility. Consideration should be given to the accessibility of the PTT switches on the top of Model U3816, as the Operator should be able to reach these easily.
- Page 2 Connect the U3816 to the intercom system using Series C38-** Jumper Cords. Connect one end of the C38-** to one of the system connectors on the U3816 and other end to a Remote Output Connector on the U3800 Master Control, or to a suitable system connector on another Module.
- Page 3 If Model C3023 Belt Station is installed, the PTT Switch on the C3023 may be used to key the corresponding radio instead of the PTT button on the U3816. To transmit over a mobile radio using the C3023 Belt Station, depress and hold the remote PTT button on the C3023, and speak into the microphone in a clear, normal level voice.
- Page 4 Figure 1 U3816 Radio Mode Jumpers and Potentiometer locations. 19519P-54 (01-20) 4 of 5...
- Page 5 Figure 2 A typical system using one U3816. Figure 3 A typical system using two U3816s. 19519P-54 (01-20) 5 of 5...
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