Kramer Electronics, Ltd.
USER MANUAL
Model:
VM-9T
Video-Audio Line Amplifier / CAT5 Transmitter
Contents
Contents
1
Introduction 1
2
Getting Started 1
2.1 Quick Start 1
3
Overview 3
3.1 About the VM-9T 3
3.2 About the Power Connect Feature 3
3.3 Shielded Twisted Pair (STP) / Unshielded Twisted Pair (UTP) 4
3.4 Recommendations for Achieving the Best Performance 4
4
Your VM-9T Video-Audio Line Amplifier / CAT5 Transmitter 5
5
Connecting the VM-9T 7
6
Technical Specifications 9
Figures
Figure 1: VM-9T Video-Audio Line Amplifier / CAT5 Transmitter 5
Figure 2: VM-9T Underside 6
Figure 3: Connecting the VM-9T Unit 8
Tables
Table 1: VM-9T Video-Audio Line Amplifier / CAT5 Transmitter Features 5
Table 2: VM-9T Underside Feature 6
Table 3: Technical Specifications of the VM-9T 9
i
Introduction
1 Introduction
Welcome to Kramer Electronics (since 1981): a world of unique, creative and
affordable solutions to the infinite range of problems that confront the video, audio
and presentation professional on a daily basis. In recent years, we have redesigned
and upgraded most of our line, making the best even better! Our 500-plus
different models now appear in 8 Groups1, which are clearly defined by function.
Congratulations on purchasing your VM-9T Video-Audio Line Amplifier /
CAT5 Transmitter, which is ideal for the following typical applications:
Video signal distribution
Video duplication studios
The package includes the following items:
VM-9T Video-Audio Line Amplifier / CAT5 Transmitter
Power cord
This user manual2
2 Getting Started
We recommend that you:
Unpack the equipment carefully and save the original box and
packaging materials for possible future shipment
Review the contents of this user manual
Use Kramer high performance high resolution cables3
2.1 Quick Start
The quick start chart summarizes the basic setup and operation.
1 GROUP 1: Distribution Amplifiers; GROUP 2: Video and Audio Switchers, Matrix Switchers and Controllers; GROUP 3:
Video, Audio, VGA/XGA Processors; GROUP 4: Interfaces and Sync Processors; GROUP 5: Twisted Pair Interfaces;
GROUP 6: Accessories and Rack Adapters; GROUP 7: Scan Converters and Scalers; and GROUP 8: Cables and Connectors
2 Download up-to-date Kramer user manuals from the Internet at this URL: http://www.kramerelectronics.com
3 The complete list of Kramer cables is on our Web site at http://www.kramerelectronics.com
1
Getting Started
2
KRAMER: SIMPLE CREATIVE TECHNOLOGY
Overview
3 Overview
This section describes:
The VM-9T, see section 3.1
The power connect feature, see section 3.2
Using shielded twisted pair (STP) / unshielded twisted pair (UTP),
see section 3.3
Recommendations for achieving the best performance, see section 3.4
3.1 About the VM-9T
The Kramer VM-9T is a high quality video audio line amplifier / CAT5
transmitter. It has looping inputs with selectable video input signal
termination, and distributes the signals to two identical outputs. The
composite video signals are on BNC connectors and the audio signals on
RCA connectors. In particular, the VM-9T:
Transmits the video and audio signal over CAT5 UTP cable to the
appropriate receiver with a transmission range of well beyond 1600
(more than 500 meters) over UTP cabling
Has a video bandwidth that exceeds 350MHz, ensuring transparency
even when operating at the highest resolution
Features front panel controls for audio level, video output level and
video cable equalization
Is housed in a desktop sized enclosure and is fed from a
100-240 VAC universal switching power supply
ft.
3.2 About the Power Connect Feature
The Power Connect feature lets you power a transmitter / receiver system by
connecting just one power adapter—to either the transmitter or the receiver.
The other unit is fed via the cable connecting between the
transmitter/receiver. The Power Connect feature applies as long as the cable
can carry power. The distance does not exceed 50 meters on standard CAT5
cable, for longer distances, heavy gauge cable should be used
1
.
For a CAT5 cable exceeding a distance of 50 meters, separate power supplies
should be connected to the transmitter and to the receiver simultaneously.
The power connect feature applies to the VM-9T. The VM-9T can power, for
example, the 712N receiver (see the example illustrated in Figure 3). However,
the 712N cannot power the VM-9T.
1 CAT5 cable is still suitable for the video/audio transmission, but not for feeding the power at these distances
3
Overview
3.3 Shielded Twisted Pair (STP) / Unshielded Twisted Pair (UTP)
The decision whether to use shielded twisted pair (STP) cable or unshielded
twisted pair (UTP) cable depends on the nature of the application.
It is recommended that in applications with high interference, shielded
twisted pair (STP) cable is used. However, the shield itself does create a
capacitance that degrades the frequency response of the machines. For shorter
distances, of 50m or so, shielded twisted pair (STP) cable is preferred because
it provides protection from interference (degradation is not apparent).
For long range applications, unshielded twisted pair (UTP) cable is preferred.
However, the unshielded twisted pair (UTP) cable should be installed far away from
electric cables, motors and so on, which are prone to create electrical interference.
3.4 Recommendations for Achieving the Best Performance
To achieve the best performance:
Connect only good quality connection cables, thus avoiding
interference, deterioration in signal quality due to poor matching, and
elevated noise- levels (often associated with low quality cables)
Avoid interference from neighboring electrical appliances that may
adversely influence signal quality and position your Kramer VM-9T
away from moisture, excessive sunlight and dust
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KRAMER: SIMPLE CREATIVE TECHNOLOGY
Your VM-9T Video-Audio Line Amplifier / CAT5 Transmitter
4 Your VM-9T Video-Audio Line Amplifier / CAT5 Transmitter
Figure 1 and Table 1 define the VM-9T:
Figure 1: VM-9T Video-Audio Line Amplifier / CAT5 Transmitter
Table 1: VM-9T Video-Audio Line Amplifier / CAT5 Transmitter Features
# Feature Function
1 POWER Switch Illuminated switch for turning the unit ON or OFF
2 AUDIO LEVEL Control Adjust1 the audio signal output level
3 VIDEO EQ. Control Adjust the cable compensation equalization level
4 VIDEO LEVEL Control Adjust the output signal level
5 VIDEO OUT BNC Connector Connects to the video acceptor (from 1 to 2)
6 VIDEO IN BNC Connector Connects to the video source
7 VIDEO LOOP BNC Connector For looping the input (if required)
8 LEFT AUDIO IN RCA Connector Connects to the left audio source
9 RIGHT AUDIO IN RCA Connector Connects to the right audio source
10 RIGHT AUDIO LOOP RCA Connector For looping the input (if required)
11 LEFT AUDIO LOOP RCA Connector For looping the input (if required)
12 LEFT AUDIO OUT RCA Connector Connects to the audio acceptor (from 1 to 2)
13 RIGHT AUDIO OUT RCA Connector Connects to the audio acceptor (from 1 to 2)
14 LINE OUT RJ-45 CAT5 Connector Connect to a line input on a receiver
15 Power Connector with FUSE AC connector for supplying power to the unit
1 Rotate carefully to adjust the appropriate level
5
Your VM-9T Video-Audio Line Amplifier / CAT5 Transmitter
Figure 2 and Table 2 define the underside panel:
# Feature Function
1 VIDEO
Figure 2: VM-9T Underside
Table 2: VM-9T Underside Feature
TERMINATION
Switch
Set to 751 to
terminate with 75, or
move to Hi-Z for
looping
1 The factory default
6
KRAMER: SIMPLE CREATIVE TECHNOLOGY
Connecting the VM-9T
5 Connecting the VM-9T
To connect a VM-9T with the 712N, as illustrated in the example in Figure 3,
do the following1:
1. On the VM-9T Video-Audio Line Amplifier / CAT5 Transmitter, connect:
A composite video source (for example, a composite video player)
to the VIDEO IN BNC connector and to the AUDIO IN RIGHT and
LEFT RCA connectors
Up to two2 VIDEO OUT BNC connectors, and the two pairs of
AUDIO RIGHT and LEFT RCA connectors, to up to two acceptors (for
example, composite video recorders)
The VIDEO LOOP BNC connector, and the AUDIO LOOP RIGHT
and LEFT RCA connectors, to the units of an additional unit (optional)
The LINE OUT connector to the LINE IN connector of the receiver,
for example, the 712N, via UTP cabling
The power cord to the mains electricity
2. On the 712N Video-Audio Line Receiver, connect:
The VIDEO OUT BNC connector to a composite video acceptor
(for example, a display)
An additional output, if required (optional), by connecting the LINE
LOOP connector to the LINE IN connector of another 712N unit, via
UTP cabling
A 12V DC power adapter to the power socket and connect the
adapter to the mains electricity. Alternatively, the 712N can be powered
via the VM-9T (see the power connect feature in section 3.2)
If required, adjust the VIDEO GAIN and EQ. levels, by inserting a
screwdriver into each of the small holes and carefully rotating them
1 Switch OFF the power on each device before connecting it to your VM-9T. After connecting your VM-9T, swit ch on its
power and then switch on the power on each device
2 When only one output is required, connect only that output, and leave the other output unconnected, as in Figure 3
7
Connecting the VM-9T
Figure 3: Connecting the VM-9T Unit
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KRAMER: SIMPLE CREATIVE TECHNOLOGY
Technical Specifications
6 Technical Specifications
Table 3 includes the technical specifications:
Table 3: Technical Specifications1 of the VM-9T
INPUTS:
OUTPUTS:
MAX. OUTPUT LEVEL: VIDEO: 2.4Vpp AUDIO: +21dBm
BANDWIDTH (-3dB): VIDEO: 350MHz AUDIO: 43kHz
DIFF. GAIN: 0.04%
DIFF. PHASE: 0.06 Deg.
K-FACTOR: <0.05%
S/N RATIO: 76MHz
CROSSTALK (all hostile): –67dB
CONTROLS: VIDEO: Level: –0.4dB to +6dB
COUPLING: VIDEO: DC AUDIO: AC
AUDIO THD + NOISE: 0.02%
AUDIO 2nd HARMONIC: 0.005%
POWER SOURCE: 100-240 VAC, 50/60Hz 12 VA
DIMENSIONS: 21.46cm x 16.25cm x 4.36cm (8.45” x 6.39” x 1.72”, W, D, H
WEIGHT: 1.4 kg (3.3 lbs.) approx.
ACCESSORIES: Power cord
1 looping composite video 1 Vpp/75 on a BNC connector
1 looping stereo audio +4dBm, on RCA connectors
2 composite video 1 Vpp/75 on BNC connectors
2 stereo audio +4dBm, on RCA connectors
1 CAT5 on an RJ-45 connector
AUDIO: Level: –12dB to +12dB
EQ.: 0dB to +10dB @ 50MHz
1 Specifications are subject to change without notice
9
10
KRAMER: SIMPLE CREATIVE TECHNOLOGY
For the latest information on our products and a list of Kramer
distributors, visit our Web site: www.kramerelectronics.com,
where updates to this user manual may be found.
We welcome your questions, comments and feedback.
Safety Warning:
Disconnect the unit from the power supply before
opening/servicing.
Caution
Kramer Electronics, Ltd.
Web site: www.kramerelectronics.com
E-mail: info@kramerel.com
P/N: 2900-000265 REV 1
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