Telecast Adder 161, Instruction Manual

Telecast Fiber Systems

48 VDC Phantom Power

A 48 VDC microphone bias supply is available to the TX units. The voltage is supplied
from a DC/DC converter that is connected through 10 K to pins 2 and 3 of the XLR

       connector. The XLR connector circuit board has 16 switches for enabling this power to
       the microphones. These switches are accessible by removing the top cover of the rack.
       The switches are numbered on the XLR circuit board.

Line Power Connection

Insert the 4-pin XLR connector from the standard Telecast power supply into the Adder

       161 DC INPUT 12-24 VDC receptacle, and plug the supply into a 120 VAC line. See
       Figure 9 for locations followed by Table 5 for connections.

AUDIO

DATA

1

CLOCK

COAX

DATA 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

3

2

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.

1

       ground

2

   no connection

3

   no connection

4

  +12 to 24 VDC

Pin

         Signal

Table 5. Power Connections

Note: Although the units will operate at 12 VDC, 13.8 VDC is required to charge the

       internal reserve battery.

Input Power Fuse

The 2-amp time delay power fuse is accessible from the rear panel on the rack mount

        units (Figure 9). Be sure to use the same fuse type if replacement is required.

9