Related Manuals for Telecast Adder 161
Summary of Contents for Telecast Adder 161
- Page 1 Adder™ 161 Audio Multiplexer Instruction Manual Telecast Fiber Systems, Inc. 102 Grove Street Worcester, MA 01605 Tel: 508-754-4858 Fax: 508-752-1520 www.telecast-fiber.com...
- Page 2 Adder™ 161...
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Page 3: Table Of Contents
Telecast Fiber Systems Telecast Adder™ 161 Table of Contents Introduction Installation Unpacking Installation of Rack Mount Units Line Power Fiber and Coaxial Cable Runs Transmitter Setup Procedure Audio Signal Setup Optimizing S/N Ratios Receiver Setup Procedure Optical Connections Electrical Connections... - Page 4 List of Tables Table 1. Maximum Fiber Lengths Table 2. Input Signal Levels Table 3. XLR Audio I/O Cable Connections Table 4. Digital Cable Connections Table 5. Power Connections Table 6. Output Signal Levels Table 7. Adder 161 Main Circuits...
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Page 5: Telecast Adder
All signals are restored at the receiver. The Adder 161 TX has a port to allow clock synchronization with additional Telecast products. * The Adder 161 also has a coaxial cable link that may be used as an alternate to the fiber. Installation Unpacking The Adder 161 System consists of: •... -
Page 6: Installation Of Rack Mount Units
The installer is responsible for providing the fiber optic cable runs, which are available from Telecast Fiber Systems, Inc. The “Accessory List”, at the end of this manual, contains part numbers for the cable and other items required for the system. Be sure that the fiber core diameters are compatible with the intended installation distances as shown in Table 1. -
Page 7: Transmitter Setup Procedure
The DIP switches should be set before installing the units in their racks. The setup DIP switches for line or mic input levels are inside the Adder 161 TX on the main circuit board. There are 16 switches, one for each channel. A representative DIP switch is shown in Figure 2. -
Page 8: Optimizing S/N Ratios
Receiver Setup Procedure The setup switches for the output levels are inside the Adder 161 RX on the main circuit board. The factory default is 0 dB. 1. With the power switch off, remove the top cover of the RX by removing the six #4 flat head screws. -
Page 9: Figure 4. Transmitter Main Circuit Board
4. Adjust the output signal levels to normalize the outputs using the Fine Level trim pot in each output circuit of the Adder 161 RX. The range of adjustment is ± 2 dB. 5. If the system is to be used with coaxial cable rather than fiber, move the small switch near the alarm switch on the PCB to the COAX position. -
Page 10: Optical Connections
A Quick-crimp kit, part number CKIT-ST-QC, is available from Telecast. Connect the fiber to the Adder 161 at each end. If a coaxial cable is used instead of a fiber, cap the optical connectors on the panels to protect them. -
Page 11: Electrical Connections
Telecast Fiber Systems COAX OPTICAL DAT A I/O DC INPUT 12-24 VDC AUDIO DA TA CLOCK Figure 6. ST Type Optical Connectors, Rear Panel Electrical Connections Audio Connections Audio I/O is via 3-pin XLR connectors with industry standard wire locations. See Table 3 and Figure 7. -
Page 12: Digital Connections
Adder™ 161 Digital Connections Digital signal connections are made via the DB-9 connectors as shown in Figure 8. The connection specifications are listed in Table 4. A 110 terminating resistor placed across the balanced inputs may be needed if cable lengths are in excess of 6 feet (if using 110 twisted pair). -
Page 13: 48 Vdc Phantom Power
DA TA CLOCK Figure 9. Rack Mount Power Connector and Fuse Locations Any power supply used with the Adder 161 must provide 1.5 amps continuous. Use the wiring connections in Table 5. The power connector is Switchcraft D4M. Signal ground... -
Page 14: Battery Charging
•Audible Alarm An audible alarm has been incorporated into the Adder 161 in addition to the LED indicators on the front panel. This alarm will alert the user that the external input power to the system has either failed completely or has dropped below the operating level necessary to charge the internal batteries. -
Page 15: Powering Up
LED is not lit. If you do not get this result, refer to Troubleshooting on page 17. Theory of Operation The Adder 161 circuit block diagram is shown in Figure 11. The Adder 161 TX accepts up to sixteen audio inputs and up to four digital inputs, and time division multiplexes them onto a single optical fiber or coaxial cable. -
Page 16: Digital I/O Circuits, Data Connectors 1 And 2
Adder™ 161 Digital I/O Circuits, Data Connectors 1 and 2 The TX digital input buffer circuit shown in Figure 12 accepts both data signals (RS-232, RS-422 and RS-423) and contact closures and delivers this information to the multiplexer. The data handling portion of the circuit is connected only to DB-9 subminiature data connectors 1 and 2. -
Page 17: Figure 13. Rx Digital Output Circuit (Connectors 1 & 2 Only)
Telecast Fiber Systems 1 of 4 MC33179 10/16 FMMD6100 Data from FMMT2222A De-Multiplexer 180pf Data from De-Multiplexer 6 of 74HC14 5 9 4 8 3 7 2 6 1 180pf Data I/O Figure: 13. RX Digital Output Circuit (Connectors 1 and 2 only) -
Page 18: Figure 14. Tx Audio Input Stage
Adder™ 161... -
Page 19: Audio I/O Circuits, Audio Outputs
Telecast Fiber Systems Audio I/O Circuits, Audio Outputs The audio output circuit is shown in Figure 15. The output impedance is 30 , balanced. 100pF 100pF Figure 15. Audio Output Circuit 30 Balanced output Frequency response into 600 @ +8 dBm... -
Page 20: Main Curcuits Explained
The battery charger (shown in Figure 16) is active whenever (all units) an Adder 161 unit is receiving DC power between 13.8 and 24 VDC. Charging current is limited to a trickle level at any voltage input. Full charge takes 16 hours. -
Page 21: Troubleshooting
Check for broken or disconnected rx status LED on communications fibers and faulty wires, or that the failure Adder 161 unit on the other end is powered on and operational. Very low output Microphone on input Move internal DIP switches to a on one audio chan. -
Page 22: Specifications
Adder™ 161 Specifications Audio Characteristics Input Signal Levels 600 balanced (low Zin) Unity gain +18 dBm peak +10 dB +8 dBm peak +20 dB dBm peak +30 dB -12 dBm peak +40 dB -22 dBm peak +50 dB -32 dBm peak 10 K balanced (high Zin) Unity gain +16 dBV peak... -
Page 23: Repair
Equipment damage may occur at higher voltages. Repair Call Telecast Fiber Systems, Inc. for assistance with the Adder 161 System at 508-754-4858 and ask for our service department. To return a unit for repair, you must obtain a return material authorization (RMA) number from Telecast service. -
Page 24: Warranty
A claim of defect in materials or workmanship in any Product shall be allowed only when it is submitted in writing to Telecast Fiber Systems, Inc. within seven days after discovery of the defect, and in any event within the Warranty Period. - Page 25 Telecast Fiber Systems...