Kramer Electronics VM-25 User Manual

Page 9

KRAMER: SIMPLE CREATIVE TECHNOLOGY

Using the VM-25 Video Distribution Amplifier

4.2 Increasing the Outputs

You can increase the number of outputs by interconnecting

VM-25 units. The

example in Figure 3 illustrates how to connect three units to increase the

number of outputs from 25 to 75.
To form a 1:75 video DA, do the following

1. Connect a video source (for example, a composite video player) to the

INPUT RCA connector of the first

VM-25 unit.

2. Connect the video LOOP RCA connector of the:

First

VM-25 unit to the INPUT RCA connector of the second VM-25

unit
Second

VM-25 unit to the INPUT RCA connector of the third

VM-25 unit

3. Connect the 25 OUT RCA connectors of the:

First

VM-25 unit to the video acceptors

1 to 25

Second

VM-25 unit to the video acceptors

26 to 50

Third

VM-25 unit to the video acceptors

51 to 75

4. On the first and second

VM-25 units, release the TERMINATION

button. On the third

VM-25 unit, push in the TERMINATION button to

terminate the line to 75 .

5. On each

VM-25 unit:

Connect the 12V DC power adapter to the power socket on the

VM-25, and plug the adapter into the mains electricity socket (not

shown in Figure 3)
If required, adjust

the video trimmer controls

for output signal level

and/or cable compensation equalization level

1 Switch OFF the power on each device before connecting it to your VM-25 units. After connecting the VM-25 units, switch
on their power and then switch on the power on each device
2 For example, composite video displays
3 Insert a screwdriver into the hole and carefully rotate it, to trim the level
4 The video outputs are arranged in five blocks of 5 outputs (outputs 1 to 5, outputs 6 to 10, outputs 11 to 15, outputs 16 to 20
and outputs 21 to 25). Each block can be separately trimmed for output level and cable equalization (EQ.) thus achieving
different compensations for different cable lengths