19510P-03 (03-92)
©1992 David Clark Company Incorporated
MODEL U3813
INSTALLATION/OPERATION INSTRUCTIONS
HEADSET STATION/REMOTE PTT
DESCRIPTION
The U3813 Headset Station/Remote PTT is designed to combine the transmit and receive
functions of a mobile radio with the David Clark Company Series 3800 Intercom System. The
Module has a headset jack, push-to-talk (PTT) button, radio input connector, two intercom
connectors and a remote PTT connector. A listen level control allows the user to adjust their
headset volume to suit individual preference without affecting the volume of other users within a
system.
An important feature of the U3813 is that while the PTT button is depressed, or while a remote
PTT switch is activated, radio transmission is limited to the user who's headset is connected to
this module.
INSTALLATION
1. Select a mounting location where the headset cord will not interfere with the user's job
function or otherwise force actions that may jeopardize safe operation when using the
module's PTT button.
2. Mount the U3813 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 and surface material.
CONNECTION
1. All cords have keyed connectors. Install cords as follows:
a. Align key-way slot on cord connector with key in corresponding connector on module.
b. Insert cord connector until firmly seated.
c. Hand tighten swivel nut on cord connector. Do not over tighten.
2. A C3821 Radio Interface Cord is used to connect the U3813 module to a mobile radio.
Connections for the C3821 are as follow:
Color
Function
Red
Microphone High
White
Microphone Low
Green
Speaker High
Black
Speaker Low
Blue
PTT Low and Shield
Yellow
PTT High
Attach the stripped end of the C3821 to the radio using the connections as above. Connect
the end of the C3821 with the 6-pin connector to the 6-socket connector on the U3813,
labeled "Radio Input".
