360 Franklin Street, Box 15054, Worcester, MA 01615-0054 TEL. 508-751-5800 FAX 508-753-5827 DESCRIPTION INSTALLATION/OPERATION INSTRUCTIONS U3800 MASTER STATION 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 its 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 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. 19505P-43 (01-92) 1 1992 David Clark Company Incorporated
6. Plug headsets into headset jacks and ensure connectors are fully seated. OPERATION 1. Push the white on/off button; it will illuminate, indicating power on. 2. Turn the system volume control knob to approximately 1/3 turn from the off position. 3. Adjust headset for a comfortable fit. Position the boom mounted microphone directly in front of your mouth, no more than 1/8 inch from your lips. 4. Speak into the microphone. If you hear yourself speaking through the earphone, you are ready to communicate. If you do not hear yourself through the earphone, check the microphone switch located on the earcup to be sure it is in the on position. Above each headset jack on the Master Station and Remote Headset Station is a headset volume control. Adjust your individual volume control to a comfortable listening level. Should more volume be required, increase the system volume by turning the system volume control knob clockwise. NOTE: To prevent ambient noise from being fed into the system during periods of no communication, press the microphone switch on the headset to the off position. With the microphone circuit turned off, the earphone circuit remains active for monitoring of system. 2
SERIES 3800 SYSTEM TROUBLESHOOTING Failure Mode Possible Cause No Comunication U3800 Master Station not turned on. Volume control turned off (a) Remote Headset Station (b) Master Station Microphone switch on headset turned off. Master Station fuse blown. Power cable line fuse blown. DC power loss. Squeal Headset plug not seated in headset jack. Headset on line, but not being worn, with push-to-talk switch locked on. Microphone is probably too close to open earphone, causing feedback. Distortion System and headset volume control set too high. Intemittent Loose connectors Comunication Low Volume Speaker s mike placement poor. System volume control or headset volume control set too low. CARE AND MAINTENANCE Headsets and earseals can be cleaned with a damp cloth. Store components in a clean, dry area. Damaged components should be returned to the distributor or factory for service. 3
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360 Franklin Street, Box 15054, Worcester, MA 01615-0054 TEL. 508-751-5800 FAX 508-753-5827 DESCRIPTION INSTALLATION/OPERATION INSTRUCTIONS U3801 REMOTE HEADSET STATION The U3801 Remote Headset Station is used to expand a David Clark Company Series 3800 Intercom System.usually at the end of a series of headset stations. There are no output connectors to connect additional modules. It has a jack to accept a plug from one headset and a listen volume control. 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. 2. Mount the U3801 by placing one grommet between each of the four mounting brackets and the mounting surface. Grommets are provided with the module while fasteners are not. The type of fastener selected should be based on mounting location. 3. Connect a C38-XX Jumper Cord, of desired length, from an output connec tor on the U3800 Master Station or a Remote Headset Station to the System Input connector on the U3801. 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. Plug headset into headset jack and ensure connector is fully seated. OPERATION 1. Adjust headset for a comfortable fit. Position the boom mounted microphone directly in front of your mouth, no more than 1/8 inch from your lips. 2. Speak into the microphone. If you hear yourself speaking through the earphone, you are ready to communicate. If you do not hear yourself through the earphone, check that both the master station and the micro phone switch located on the earcup are in the ON position. NOTE: The earphone circuit remains active even if the microphone is turned off. 3. Adjust the volume control on the U3801 for a comfortable listening level. 19509P-16 (10-92) 5 1992 David Clark Company Incorporated
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360 Franklin Street, Box 15054, Worcester, MA 01615-0054 TEL. 508-751-5800 FAX 508-753-5827 DESCRIPTION INSTALLATION/OPERATION INSTRUCTIONS U3802 REMOTE HEADSET STATION The U3802 Remote Headset Station is used to expand a David Clark Company Series 3800 Intercom System. The U3802 has a jack to accept a plug from one headset, a system input connector, a listen volume control and two output connectors so that additional Remote Headset Stations may be connected. 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. 2. Mount the U3802 by placing one grommet between each of the four mounting brackets and the mounting surface. Grommets are provided with the module while fasteners are not. The type of fastener selected should be based on mounting location. 3. 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. 4. A C38-XX Jumper Cord, of desired length, is required to connect a U3802 to a U3800 Master Station or another Remote Headset Station. Connect one end of the C38-XX to the System Input connector on the U3802. The other end can be connected to a connector marked Remote Output on a U3800 or to any Input or Output connector on a Remote Headset Station. 5. Plug a headset into the headset jack and ensure the connector is fully seated. OPERATION 1. Adjust headset for a comfortable fit. Position the boom mounted microphone directly in front of your mouth, no more than 1/8 inch from your lips. 2. Speak into the microphone. If you hear yourself speaking through the earphone, you are ready to communicate. If you do not hear yourself through the ear phone, check that both the master station and the microphone switch located on the earcup are in the ON position. NOTE: The earphone circuit remains active even if the microphone is turned off. 3. Adjust the volume control on the U3802 for a comfortable listening level. 19509P-17 (06-93) 7 1993 David Clark Company Incorporated
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360 Franklin Street, Box 15054, Worcester, MA 01615-0054 TEL. 508-751-5800 FAX 508-753-5827 DESCRIPTION INSTALLATION/OPERATION INSTRUCTIONS U3803 REMOTE JUNCTION MODULE The U3803 Remote Junction Module has four identically wired connectors for expanding the number of headset stations utilized in the system. A U3803 may be added to a David Clark Company Series 3800 Intercom System wherever C38-XX Jumper Cords are to be interconnected. INSTALLATION 1. Mount the U3803 by placing one grommet between each of the four mounting brackets and the mounting surface. Grommets are provided with the module while fasteners are not. The type of fastener selected should be based on mounting location. 2. 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. 3. C38-XX Jumper Cords, of desired lengths, are required to connect a U3803 to a Series 3800 Intercom System. Connect a C38-XX from an Output connector on a U3800 Master Station or a Remote Headset Station to any of the connectors on a U3803. Connect C38-XX Jumper Cords from any of the remaining connectors on the U3803 to the Input connectors of Remote Headset Stations. Figure 1. Model U3803 Remote Junction Module Schematic Diagram. 19509P-18 (04-89) 9 1989 David Clark Company
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360 Franklin Street, Box 15054, Worcester, MA 01615-0054 TEL. 508-751-5800 FAX 508-753-5827 DESCRIPTION INSTALLATION/OPERATION INSTRUCTIONS U3804 REMOTE HEADSET STATION The U3804 Remote Headset Station is used with a remote radio control head, including systems utilizing full duplex operation. A selector switch allows the remote station operator access to the mobile radio or the David Clark Company Series 3800 Intercom System. Place the selector switch in the Radio position to access the receive and transmit functions of the radio. To transmit, depress and hold the push-to-talk (PTT) button on the C3009 Belt Station. Release the PTT button to receive transmissions on radios without a duplex feature. Communication over the intercom is not possible in the radio mode. In the Intercom position, a U3804 operator can only transmit over the radio when someone keys one of the PTT buttons located on the U3810 or U3812 Radio Interface Modules. All incoming radio messages on the intercom will still be heard by the remote station operator, provided no one has pushed a PTT button to transmit over the radio. 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. 2. Mount the U3804 by placing one grommet between each of the four mounting brackets and the mounting surface. Grommets are provided with the module while fasteners are not. The type of fastener selected should be based on mounting location. 3. 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. 4. A C38-XX Jumper Cord, of desired length, is required to connect the U3804 to a U3800 Master Station or another Remote Headset Station. Connect one end of the C38-XX to the System Input connector on the U3804 and the other end to the Remote Output on the U3800 or to any Input or Output connector on a Remote Headset Station. 5. A C3821 Radio interface Cord is required to connect the remote radio control head to the U3804. Following the schematic supplied with the C3821, install the cord from the remote radio control head to the Radio Input connector on the U3804. 6. Connect the C3009 Belt Station cable to the Belt Station connector on the U3804. 19507P-93 (02-92) 11 1992 David Clark Company Incorporated
NOTE: A Model C3009 Belt Station must be used to interface a U3804 Remote Headset Station. 7. Plug headset into headset jack located on the C3009 Belt Station. OPERATION 1. Adjust headset for a comfortable fit. Position the boom mounted microphone directly in front of your mouth, no more than 1/8 inch from your lips. 2. Turn selector switch to the Radio position, adjust the radio volume to a comfortable listening level using the volume control on the radio. 3. To transmit over the radio, depress and hold the C3009 Belt Station PTT button. Release the button when the transmission is completed. 4. Turn selector switch to the Intercom position, adjust intercom volume to a comfortable listening level using the volume control on the U3804. Be sure that the microphone is turned on. To communicate with others on the inter com system, speak into the microphone. NOTE: While in intercom mode, if the push-to-talk button on the U3810 Radio Interface Module or U3812 Dual Radio Interface Module is depressed, all communication on the intercomsystem will be transmitted over the mobile radio. Figure 1. Model U3804 Remote Headset Station Schematic Diagram. 12
360 Franklin Street, Box 15054, Worcester, MA 01615-0054 TEL. 508-751-5800 FAX 508-753-5827 DESCRIPTION INSTALLATION INSTRUCTIONS MODEL U3805 RADIO JUNCTION MODULE Model U3805 Radio Junction Module is a passive module that permits multiple Series 3800 Radio Interface Modules (a maximum of four) to be connected to one radio. Model U3805 provides one output to a mobile radio, one primary input from a Series 3800 Radio Interface Module, and three secondary inputs from Series 3800 Radio Interface Modules. Model U3805 also accepts input from Model C3019 Utility Radio Adapters (a modification is required to enable the use of Model C3019). INSTALLATION 1. Mounting a) Select a suitable mounting location that will provide clearance for the U3805 and all necessary connections. b) Select an appropriate fastener based on mounting location and surface type (fasteners are not included with the U3805). c) Place a grommet between each of the four mounting brackets and the mounting surface (grommets are included with the U3805). d) Insert the fasteners through the four mounting brackets, and the grommets. e) Tighten the fasteners until the grommets begin to compress. DO NOT OVERTIGHTEN THE FASTENERS 2. Connections a) Connections are made using cords having MS type, screw-on connectors. These connectors mate as follows: i) Align key-way of cord mounted connector with key of module mounted connector. ii) Insert cord mounted connector to module mounted connector until firmly seated. iii) Hand tighten swivel nut of cord connector. DO NOT OVER-TIGHTEN. b) Connect the U3805 to a radio using Model C3821 Radio Interface Cord. i) Cut the C3821 Radio Interface to the proper length. ii) Connect the male, six pin, MS connector on the C3821 to the Radio Input connector on the U3805. 19510P-87(06-97) 13 1997 David Clark Company Incorporated
iii) 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.) Wire Color Red White Green Black Blue Yellow Function Mic High Mic Low Receive High Receive Low PTT Low PTT High c) Connect the U3805 to Series 3800 Radio Modules using Model C3821 radio Interface Cords. i) Cut the C3821 Radio Interface Cord to the proper length. ii) Affix a six socket, MS type connector, P/N 18352G-17, to the unterminated end, wired as follows: Socket Wire Color Function A Red Mic High B White Mic Low c Green Receive High D Black Receive Low E Blue PTT Low F Yellow PTT High iii) Connect the six socket, MS type connector on the C3821 to the Primary Input connector on the U3805. iv) Connect the six pin, MS type connector on the C3821 to a Series 3800 Radio Interface Module Radio Input Connector. v) Repeat steps i-iv for additional cords, as necessary, using the Secondary Input connectors on the U3805. 14
3. Modification to accept Model C3019 Belt Station If a Model C3019 Utility Radio Adapter Cord is to be connected to the Radio through Model U3805 it will be necessary to modify the U3805 to permit proper Radio Receive function. a) Disconnect the Amp Connector, corresponding to the MS Connector to which the C3019 will be connected, from the PC board. b) Pull up on the green and black wires until they pop out of the connector. (These wires are shown by dashed lines.) c) Strip the green and black wires 1/4" and tin. d) Solder the green wire to Pin C of the Primary Input MS Connector. e) Solder the black wire to Pin D of the Primary Input MS Connector. NOTE: Be careful not to disturb the existing green and black wires in Pins C and D, respectively of primary input connector. 15
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360 Franklin Street, Box 15054, Worcester, MA 01615-0054 TEL. 508-751-5800 FAX 508-753-5827 DESCRIPTION INSTALLATION/OPERATION INSTRUCTIONS U3806 DUAL HEADSET INTERCOM STATION The U3806 Remote Headset Station is used to expand a David Clark Company Series 3800 Intercom System usually at the end of a series of headset stations. There is an output connector to add additional modules. It has two jacks to accept the plug from one or two headsets and individual listen volume controls. INSTALLATION 1. Select a mounting location where the headset cord will not interfere with the operator s job functions or otherwise force actions that may jeopardize safe operation. 2. Mount the U3806 by placing one grommet between each of the four mounting brackets and the mounting surface. Grommets are provided with the module while fasteners are not. The type of fastener selected should be based on mount ing location. 3. Connect a C38-XX Jumper Cord, of desired length, from an output connector on the U3800 Master Station or a Remote Headset Station to the System Input connector on the U3806. 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. Plug headset into headset jack and ensure connector is fully seated. OPERATION 1. Adjust headset for a comfortable fit. Position the boom mounted microphone directly in front of your mouth, no more than 1/8 inch from your lips. 2. Speak into the microphone. If you hear yourself speaking through the earphone, you are ready to communicate. If you do not hear yourself through the earphone, check that both the master station and the microphone switch located on the earcup are in the ON position. NOTE: The earphone circuit remains active even if the microphone is turned off. 3. Adjust the volume controls on the U3806 for comfortable listening levels. 19520P-65 (06-96) 17 1996 David Clark Company Incorporated
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360 Franklin Street, Box 15054, Worcester, MA 01615-0054 TEL. 508-751-5800 FAX 508-753-5827 DESCRIPTION INSTALLATION/OPERATION INSTRUCTIONS U3810 RADIO INTERFACE MODULE The U3810 Radio Interface Module is designed to combine the transmit and receive functions of a mobile radio with the David Clark Company Series 3800 Intercom System. The U3810 has a radio push-to-talk (PTT) button, connectors for the U3800 Master Station and mobile radio, plus connectors for customer supplied remote PTT. Use of this module causes all 3800 intercom communications to be transmitted by the radio when the PTT button is pressed. 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 when using the module s PTT button. 2. Mount the U3810 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. 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. 4. A C3821 Radio Interface Cord is required to connect the mobile radio to the U3810. Following the schematic supplied with the C3821, install the cord from the mobile radio to the Radio Input connector on the U3810. 5. A C38-XX Jumper Cord, of desired length, is required to connect the U3810 to a U3800 Master Station or another Remote Headset Station. Connect one end of the C38-XX to the System Input connector on the U3810 and the other end to the Remote Output on the U3800 or to any Input or Output connector on a Remote Headset Station. 6. If a customer furnished remote PTT switch is being used, install the cord to a Remote PTT connector on the U3810. The remote PTT is a 2 pin connec tor that keys the radio only when the pins are shorted together. OPERATION 1. Adjust headset for a comfortable fit. Position the boom mounted micro phone directly in front of your mouth, no more than 1/8 inch from your lips. 19507P-90 (04-89) 19 1989 David Clark Company
2. To transmit over the radio, depress and hold the PTT button. Release the button when the transmission is completed, allowing the response to be heard. NOTE: Radio transmits everything said on intercom when push-to-talk button on U3810 Radio Interface Module or any remote PTT is depressed. 3. To transmit using a customer furnished remote PTT switch, depress and hold the remote PTT button and talk into the headset microphone. Release the button to listen. NOTE: Radio speakers mounted near the headset may produce feedback, causing a squeal when transmitting. If this occurs, measures may have to be taken to reposition speakers or to add a cut-off switch to the speaker line. Figure 1. Model U3810 Radio Interface Module Schematic Diagram NOTES: 1. All resistor values are in ohms, 1/4 W, 5% tolerance unless otherwise specified. 2. All capacitor values are in microfarads unless otherwise specified. 20
360 Franklin Street, Box 15054, Worcester, MA 01615-0054 TEL. 508-751-5800 FAX 508-753-5827 INSTALLATION/OPERATION INSTRUCTIONS U3811 RADIO INTERFACE MODULE DESCRIPTION The U3811 Interface Module is designed to combine the transmit and receive functions of a mobile radio with the David Clark Company Series 3800 Intercom System. The U3811 has a headset jack, push-to-talk (PTT) button, radio input connector and intercom output connector. A listen volume control on the U3811 controls this person s headset volume only. The important feature of the U3811 is that while the PTT button is depressed, the headset plugged into this module is the only one with the capability to transmit over the mobile radio. 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 when using the module s PTT button. 2. Mount the U3811 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. 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. 4. A C3821 Radio Interface Cord is required to connect the mobile radio to the U3811. Following the schematic supplied with the C3821, install the six wire end of the cord to the mobile radio and the six pin end to the Radio Input connector on the U3811. NOTE: When more than one U3811 Radio Interface Module is installed to a common radio, the audio low and audio high lines to only one U3811 Radio Interface Module should be connected to the receive audio output of the radio. 5. A C38-XX Jumper Cord, of desired length, is required to connect the U3811 to a U3800 Master Station or another Remote Headset Station. Connect one end of the C38-XX to the System Input connector on the U381 I and the other end to the Remote Output on the U3800 or to any Input or Output connector on a Remote Headset Station. OPERATION 1. The receive audio of the radio will be heard in all the U3800 system headsets. Again, keep in mind that the U3811 module limits radio transmit capability to the person whose headset is plugged into the module. 2. Adjust headset for a comfortable fit. Position the boom mounted microphone directly in front of your mouth, no more than 1/8 inch from your lips. 3. To transmit over the radio, depress and hold the PTT button. Release the button to listen. NOTE: Radio speakers mounted near the headset may produce feedback, caus ing a squeal when transmitting. If this occurs, measures may have to be taken to reposition speakers or to add a cut-off switch to the speaker line. 19509P-19 (05-94) 21 1994 David Clark Company Incorporated
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360 Franklin Street, Box 15054, Worcester, MA 01615-0054 TEL. 508-751-5800 FAX 508-753-5827 DESCRIPTION INSTALLATION/OPERATION INSTRUCTIONS U3812 DUAL RADIO INTERFACE MODULE The U3812 Dual Radio Interface Module is designed to interface two separate radio systems to a David Clark Company Series U3800 Intercom System. A priority reception feature enables the user to select which radio system reception will have precedence by simply connecting the priority radio to the priority radio input connector. A push-to-talk (PTT) button for each radio system and a priority reception override button, which allows the secondary radio reception to be received uninterrupted, are located on the U3812. A remote PTT connector is also provided for each radio system so that a user may connect a remote PTT switch for either or both radio systems. INSTALLATION 1. Select a mounting position where the headset cord will not interfere with the operator s job function or otherwise force actions that may jeopardize safe operation when using the module s PTT buttons. 2. Mount the U3812 by placing one grommet between each of the four mounting brackets and the mounting surface. Grommets are provided with the module while fasteners are not. The type of fastener selected should be based on mounting location. 3. 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. 4. C3821 Radio Interface cords are required to connect the primary and sec ondary radios to U3812. Following the schematic supplied with the C3821, install each cord to its respective radio. Connect the primary radio s interface cord to the Primary Radio connector on the back of the U3812. Connect the secondary radio s interface cord to the Secondary Radio connector on the back of the U3812. 5. A C38-XX Jumper Cord, of desired length, is required to connect the U3812 to a U3800 Master Station. Connect one end of the C38-XX to the System Input connector on the U3812 and the other end to the Remote Output on the U3800. 19507P-94 (04-89) 23 1989 David Clark Company
6. If a customer furnished remote PTT switch is being used, install the cord to its respective Remote PTT connector on the U3812. Customer furnished PTT switches may be connected to the two pin primary and secondary remote PTT connectors. Note that pin A is grounded in the U3812, and pin B is PTT high. OPERATION 1. The receive audio of both the primary and secondary radios will be heard in all the U3800 system headsets. Should audio from both radios occur simul taneously, the priority feature in the U3812 will automatically reduce the secondary radio audio to an almost inaudible level while allowing the primary radio audio through at its normal level. 2. Should uninterrupted reception from the secondary radio be desired, depress and hold the priority reception override button on the U3812. To return the U3812 to the priority mode, release the override button and reception on the primary radio will resume. NOTE: The priority override feature affects the intercom system audio only, it does not affect any external radio speakers that may be installed in the vehicle. 3. To transmit over the priority radio, depress and hold the priority radio PTT button and talk into the headset microphone. Release the button to listen. 4. To transmit over the secondary radio, depress and hold the secondary radio PTT button and talk into the headset microphone. Release the button to listen. NOTE: Radio speakers mounted near the headset may produce feed back, causing a squeal when transmitting. If this occurs, measures may have to be taken to reposition speakers or to add a cut-off switch to the speaker line. 5. To transmit using a customer furnished remote PTT switch, depress and hold the remote PTT button and talk into the headset micro- phone. Release the button to listen. 24
Figure 1. Model U3812 Dual Radio Interface Module Schematic Diagram NOTES: 1. All resistor values are in ohms, 1/4 W, 5% tolerance unless otherwise specified. 2. All capacitor values are in microfarads unless otherwise specified. 19507P-94 (04-89) cont. 25
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360 Franklin Street, Box 15054, Worcester, MA 01615-0054 TEL. 508-751-5800 FAX 508-753-5827 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 gromment 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 follows: Color Red White Green Black Blue Yellow Function Microphone High Microphone Low Speaker High Speaker Low PTT Low and Shield 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. NOTE: If more than one radio interface module is used in a Series 3800 System connected to a common mobile radio the speaker audio connections should be made to only one of the modules. 19510P-03 (03-92) 27 1992 David Clark Company Incorporated
3. C38-** Jumper Cords, of appropriate length, are used to connect the U3813 Module to other components within the system. Connect one end of the jumper cord to one of the connectors on the U3813 labeled System Input and the other end of the jumper cord to a connector on the U3800, or other module, labeled System Input, or Remote Output. NOTE: All of the 4 socket connectors on any module within a system are acceptable connection points for jumper cords. 4. Remote PTT switches may be used in conjunction with the U3813. These devices attach to the U3813 using the 5 socket connector labeled Remote PTT. A connector kit P/N 18352G-07, when necessary, is used to connect the PTT switch to the U3813. The heavy duty Footswitch (P/N 4007IG-04), with a 15 foot cord and connector, is specifically designed for this purpose but any SPST switch may also be used. Remote PTT connector diagram 5. Connect a Series 7000 Headset to the connector on the face of the U3813 by lifting the cover on the U3813 and seating the headset connector firmly into the receptacle. OPERATION 1. Adjust headset for a comfortable fit. 2. Position the boom mounted microphone directly in front of your mouth, within 1/8" of your lips. NOTE: In order to properly cancel background noise and provide clear communications, placement of the microphone must be within 1/8" of your lips. 3. Adjust the listen level control on the U3813 to a comfortable level. 4. The receive audio from the radio will be heard in all headsets connected to the system. 5. To transmit over the radio, depress and hold the PTT switch on the U3813 or depress and hold the remote PTT switch, if your system is so equipped. NOTE: Radio speakers mounted near the headset may produce feed back, causing a squeal when transmitting. If this occurs, the speaker should be relocated, or a speaker cutoff switch should be installed. 28
360 Franklin Street, Box 15054, Worcester, MA 01615-0054 TEL. 508-751-5800 FAX 508-753-5827 DESCRIPTION INSTALLATION/OPERATION INSTRUCTIONS U3814 MULTI-RADIO INTERFACE MODULE The U3814 Multi-Radio Interface Module is designed to interface four separate systems to a David Clark Company Series 3800 Intercom System. A red LED indicator over the radio push-to-talk bufton (PTT) will light, indicating transmission over the selected radio. A Headset Jack is provided for interface of the operator s H3300 series headset at the module, or if desired, a remote PTT connector is also provided, allowing for radio and intercom communication up to 15 feet away from the module. A C3023 Belt Station/Radio PTT is required to interface the H3300 series headset to the modules if the remote operation is desired. The Radio Volume control adjusts the listen level of the radio selected by the operator. The radio listen level however, cannot be increased beyond that set at the control head of the selected radio. The Headset Volume control allows for the setting of a comfortable listening level to the operator s headset. Two System connectors are provided for connecting the module to the series 3800 intercom system and for connecting additional headset stations or system modules. A Speaker Cutout connector is provided to allow the user to shut off the speaker on the radio selected by the Radio Select switch. A typical operating mode would entail making a relay closure when the Radio Select switch is turned to the radio in use. This enables the operator, through the use of his own relay, to cut off the speaker of the radio he is switched to, but would leave the remaining radio speakers on. 19518P-60 (10-94) 29 David Clark Company Incorporated
The following table shows the electrical status of the Speaker Cutout connector pins for each Radio Select switch position. Speaker Cutout Pin Status For Each Radio Select Switch Position Radio Selector Switch Position Radio 1 Radio 2 Radio 3 Radio 4 Speaker Cutout Connector Pins Making Electrical Contact A and B A and C A and D A and E NOTE: Speaker Cutout port current and operating voltage not to exceed 10 MA at 14 VDC. It is typical for the user to connect pin A of the Speaker Cutout port, to a good GND, and then to connect pins 8, C, D, and E, to the common side of the respective relay coils. The user s speakers would then be wired through the normally closed portion of the relay contacts. When a radio is selected, its corresponding relay would then be turned on, thus opening its speaker line and making it less distracting for the listener. The other three radio speakers would still be on, making it possible for other personnel within the vehicle to monitor the other three radios. If stand-alone operation is desired, the U3814 may be powered directly from switched battery power (+13.8 VDC) from the vehicle. For this mode of operation, the vehicle switched battery (+13.8 VDC and GND) should be connected, through the appropriate MS connector, to V REG and GND, respectively, at one of the system ports. In addition, a jumper (JP10) must be soldered in place on the printed circuit board. It is important to note that in stand-alone operation, there will be no side-tone in the headset. Receive audio will come from the radio only. Furthermore, since the radio side of the audio path is isolated from the system side by a 600 ohm/600 ohm transformer only (i.e., no U3800 audio amplifier), there will be a reduction in radio audio volume to the headsets in the stand- alone operating mode. To compensate for this, the installer may want to set the radio audio level high using the volume control on the radio. Once this has been accomplished, check the speaker audio level and, if it is too bright, it might be necessary to pad it down to a comfortable listening level. Finally, due to excessive alternator noise in some vehicles, it may be necessary to insert a line filter in the 13.8 V/GND power line (just ahead of the U3814) during standalone operation. This will be especially true if the alternator noise is picked up by the dispatcher during mobile radio transmission. Commercial line filters are relatively inexpensive and are available through most electronics distributors. 30
INSTALLATION 1. Select a mounting position where the headset cord will not interfere with the operator s job function or otherwise force actions that may jeopardize safe operation when using the module s PTT button. 2. Mount the U3814 by placing a grommet between each of the four mounting brackets and the mounting surface. Grommets are provided with the module while fasteners are not. The type of fastener selected should be based on mounting considerations. 3. 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. 4. C3821 Radio Interface cords are required to connect the radios to the U3814. Following the schematic supplied with the C3821, install each cord to its respec tive radio. 5. A C38-XX Jumper Cord, of desired length, is required to connect the U3814 to a U3800 Master Station. Connect one end of the C38-XX to one of the system connectors on the U3814 and other end to the Remote Output on the U3800. OPERATION 1. The receive audio of the selected radio will be heard in all the U3800 system headsets. 2. To transmit over the selected radio, depress and hold the radio PTT bufton and talk into the headset microphone. Release the bufton to listen. NOTE: Radio speakers mounted near the headset may produce feedback, causing a squeal when transmitting. If this occurs, measures may have to be taken to reposition speakers or to add a cut-off switch to the speaker line. 3. To transmit over the selected radio using the C3023 headset adapter, depress and hold the remote PTT bufton and talk into the headset microphone. Release the bufton to listen. The C3023 headset adapter also contains headset jack, listen level control and 15 foot extended coil cord. 31
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360 Franklin Street, Box 15054, Worcester, MA 01615-0054 TEL. 508-751-5800 FAX 508-753-5827 MODEL U3815 INSTALLATION/OPERATION INSTRUCTIONS HEADSET STATION/REMOTE PTT DESCRIPTION The U3815 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 U3815 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 U3815 by placing one gromment 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 U3815 module to a mobile radio. Connections for the C3821 are as follows: Color Red White Green Black Blue Yellow Function Microphone High Microphone Low Speaker High Speaker Low PTT Low and Shield 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. NOTE: If more than one radio interface module is used in a Series 3800 System connected to a common mobile radio the speaker audio connections should be made to only one of the modules. 19514P-13 (03-92) 33 1992 David Clark Company Incorporated
3. C38-** Jumper Cords, of appropriate length, are used to connect the U3813 Module to other components within the system. Connect one end of the jumper cord to one of the connectors on the U3815 labeled System Input and the other end of the jumper cord to a connector on the U3800, or other module, labeled System Input, or Remote Output. NOTE: All of the 4 socket connectors on any module within a system are acceptable connection points for jumper cords. 4. Remote PTT switches may be used in conjunction with the U3815. These devices attach to the U3815 using the 5 socket connector labeled Remote PTT. A connector kit P/N 18352G-07, when necessary, is used to connect the PTT switch to the U3815. The heavy duty Footswitch (P/N 40071G-04), with a 15 foot cord and connector, is specifically designed for this purpose but any SPST switch may also be used. Remote PTT connector diagram 5. Connect a Series 3000 Headset to the connector on the face of the U3815 by lifting the cover on the U3815 and seating the headset connector firmly into the receptacle. OPERATION 1. Adjust headset for a comfortable fit. 2. Position the boom mounted microphone directly in front of your mouth, within 1/8" of your lips. NOTE: In order to properly cancel background noise and provide clear communications, placement of the microphone must be within 1/8 of your lips. 3. Adjust the listen level control on the U3815 to a comfortable level. 4. The receive audio from the radio will be heard in all headsets connected to the system. 5. To transmit over the radio, depress and hold the PTT switch on the U3815 or depress and hold the remote PTT switch, if your system is so equipped. NOTE: Radio speakers mounted near the headset may produce feedback, causing a squeal when transmitting. If this occurs, the speaker should be relocated, or a speaker cutoff switch should be installed. 34
360 Franklin Street, Box 15054, Worcester, MA 01615-0054 TEL. 508-751-5800 FAX 508-753-5827 DESCRIPTION MODEL U3815A INSTALLATION/OPERATION INSTRUCTIONS HEADSET STATION/REMOTE PTT The U3815A Headset Station/Rernote 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 U3815A is that while the PTT button is depressed, or while a remote PTT switch is activated, radio transmission is limited to the user whose 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 U3815A by placing one gromment 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. Note: Do not over tighten. 2. A C3821 Radio Interface Cord is used to connect the U3815A module to a mobile radio. Connections for the C3821 are as follows: Color Red White Green Black Blue Yellow Function Microphone High Microphone Low Speaker High Speaker Low PTT Low and Shield PTT High 19510P-93 (01-92) 35 1992 David Clark Company Incorporated
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 U3815A, labeled Radio Input. NOTE: If more than one radio interface module is used in a series 3800 System connected to a common mobile radio the speaker audio connections should be made to only one of the modules. 3. C38-** Jumper Cords, of appropriate length, are used to connect the U3815A Module to other components within the system. Connect one end of the jumper cord to one of the connectors on the U3815A labeled System Input and the other end of the jumper cord to a connector on the U3800, or other module, labeled System Input, or Remote Output. NOTE: All of the 4 socket connectors on any module within a system are acceptable connection points for jumper cords 4. Remote PTT switches of several types may be used in conjunction with the U3815A. These devices attach to the U3815A using the 5 socket connector labeled Remote PTT. These switches include the following: a. Headset Belt Station, Model C3023, which is a belt pack containing a headset jack, listen level control, PTT switch belt clip, and a 15 foot coil cord. b. Footswitch, P/N 40071G-04, which is a heavy duty footswitch with a 15 foot cord. c. Any SPST switch may also be used. A connector kit P/N 18352G-07 is used to connect to the U3815A. 18352G-07 Connector Kit Figure 1. Remote PTT connector diagram 5. Connect a headset to the connector on the face of the U3815A by lifting the cover on the U3315A and seating the headset connector firmly into the receptacle. 36
360 Franklin Street, Box 15054, Worcester, MA 01615-0054 TEL. 508-751-5800 FAX 508-753-5827 OPERATION 1. Adjust headset for a comfortable fit. 2. Position the boom mounted microphone directly in front of your mouth, within 1/8" of your lips. In order to properly cancel background noise and provide clear communications, placement of the microphone must be within 1/8 of your lips. 3. The microphone is activated/deactivated by pushing the switch on the earcup of the headset. It is not necessary to hold this switch. Push to activate, push again to deactivate. 4. Adjust the listen level control on the U3815A to a comfortable level. 5. The receive audio from the radio will be heard in all headsets connected to the system. 6. To transmit over the radio, depress and hold the PTT switch on the U3815A or depress and hold the remote PTT switch, if your system is so equipped. NOTE: Radio speakers mounted near the headset may produce feedback, causing a squeal when transmitting. If this occurs, the speaker should be relocated, or a speaker cutoff switch should be installed. NOTE: UNLESS OTHERWISE SPECIFIED, ALL RESISTOR VALUES ARE IN OHMS. 1/4 WATT, 5% TOLERANCE. 37
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360 Franklin Street, Box 15054, Worcester, MA 01615-0054 TEL. 508-751-5800 FAX 508-753-5827 DESCRIPTION INSTALLATION/OPERATING INSTRUCTIONS MODEL U3816 DUAL-RADIO INTERFACE MODULE 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). 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) Align key-way of cord mounted connector with key of module mounted connector. ii) Insert cord mounted connector to module mounted connector until firmly seated. iii) Hand tighten swivel nut of cord connector. DO NOT OVER-TIGHTEN. b) Connect the U3816 to the radios using Model C3821 Radio Interface Cords. i) Cut the C3821 Radio Interface Cord to the proper length. ii) Connect the male, six pin, MS connector on the C3821 to the Radio Input connector on the U3816. 19519P-54(11-95) 39 1995 David Clark Company Incorporated