Telecast Adder 161, Instruction Manual

Page 1: ...Telecast Fiber Systems Inc 102 Grove Street Worcester MA 01605 Tel 508 754 4858 Fax 508 752 1520 www telecast fiber com Adder 161 Audio Multiplexer Instruction Manual...

Page 2: ...Adder 161 ii...

Page 3: ...Electrical Connections 7 Audio Connections 7 Digital Connections 8 48 VDC Phantom Power 9 Line Power Connection 9 Input Power Fuse 9 Battery Charging 10 Panel Indicators 10 Powering Up 11 Theory of Op...

Page 4: ...se Locations 9 Figure 10 TX and RX Front Panel 10 Figure 11 Electronic Block Diagram 11 Figure 12 TX Digital Input Circuit Connectors 1 2 only 12 Figure 13 RX Digital Output Circuit Connectors 1 2 onl...

Page 5: ...manual Within an Adder 161 TX transmitter unit the audio signals are first digitized and then multiplexed with the digital control signals The combined electrical signal is converted to an optical sig...

Page 6: ...wer supplies require 120 VAC Be sure that AC outlets are within reach of their 6 foot power cords Fiber and Coaxial Cable Runs The installer is responsible for providing the fiber optic cable runs whi...

Page 7: ...k 40 dB 22 dBm peak 40 dB 24 dBV peak 50 dB 32 dBm peak 50 dB 34 dBV peak Audio Signal Setup Note Setting up the internal switches on the rack mount unit requires removal of its top cover The DIP swit...

Page 8: ...dBm the input gain can be set to 10 dB and the RX attenuation set to 10 dB Thus the signal levels remain at the same reference level throughout Receiver Setup Procedure The setup switches for the outp...

Page 9: ...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 al...

Page 10: ...are available from Telecast Fiber Systems Inc For custom cable fabrication use type ST connectors such as Telecast part number CONN ST QC Always follow the connector manufacturer s directions when fa...

Page 11: ...locations See Table 3 and Figure 7 Pin Signal 1 Ground 2 Balanced I O 3 Balanced I O Table 3 XLR Audio I O Cable Connections The XLR connectors are on the rear panel as shown in Figure 7 Transmitter...

Page 12: ...ia 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 exces...

Page 13: ...ly into a 120 VAC line See Figure 9 for locations followed by Table 5 for connections AUDIO DA TA 1 CLOCK COAX DAT A I O SLO DC INPUT 12 24 VDC 2 3 4 OPTICAL 1 3 5 7 9 11 13 15 2 4 6 8 10 12 14 16 1 4...

Page 14: ...fter one half hour of charging There may be a few minutes of reserve power after the indicators turn off Rx Status This red LED on the receiver is on when the fiber optic link is not properly attached...

Page 15: ...digital inputs and time division multiplexes them onto a single optical fiber or coaxial cable The system has two basic functions multiplexing signals onto an optical fiber or coaxial cable and demul...

Page 16: ...e accepted and sent on connectors 1 and 2 The contact input and relay output circuits are as described above The pin wiring for connector 3 and 4 closure circuits is the same as on connectors 1 and 2...

Page 17: ...Multiplexer A B C D E F 51 51 51 10k 10k 1 of 4 MC33179 6 of 74HC14 180pf 180pf 5 9 4 8 3 7 2 6 1 Data I O Data from De Multiplexer FMMT2222A FMMD6100 1k 10 16 5v 5 IN OUT Figure 13 RX Digital Output...

Page 18: ...Adder 161 Figure 14 TX Audio Input Stage 14...

Page 19: ...2 dB 10 dB 8 dBm peak From 20 Hz to 25 KHz 0 2 dB Table 6 Output Signal levels Optical Outputs The optical output is generated from a high power LED or Laser coupled to the fiber User connections are...

Page 20: ...wn 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 ho...

Page 21: ...power depleted adapter If the light does not turn green replace the battery No operation Fiber or coax Check for broken or disconnected rx status LED on communications fibers and faulty wires or that...

Page 22: ...6 dBV peak 20 dB 4 dBV peak 30 dB 14 dBV peak 40 dB 24 dBV peak 50 dB 34 dBV peak Output Signal Levels 30 balanced output into 600 W Unity gain 18 dBm peak 10 dB 8 dBm peak Frequency response 8 dBm Fr...

Page 23: ...p 0 19 2 KBits sec Jitter 1 12 msec higher rates possible dependent on user system jitter tolerance Contact Closure TX Input TTL 1 or open circuit remote contact open TTL 0 or shorted to circuit groun...

Page 24: ...ate maintenance and care Nor shall this warranty apply to any damage caused in whole or in part by attempts by personnel other than Telecast s personnel as approved in advance in accordance with the f...

Page 25: ...Telecast Fiber Systems 21...