KRAMER: SIMPLE CREATIVE TECHNOLOGY
Using the VM-25 Video Distribution Amplifier
6
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
:
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
2
1 to 25
Second
VM-25
unit to the video acceptors
2
26 to 50
Third
VM-25
unit to the video acceptors
2
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
3
the video trimmer controls
4
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
