Kramer Electronics, Ltd.
USER MANUAL
Model:
VM-25
1:25 Video Distribution Amplifier
Contents
Contents
1
Introduction 1
2
Getting Started 1
3
Overview 1
4
Using the VM-25 Video Distribution Amplifier 4
4.1 Connecting a VM-25 Video Distribution Amplifier 4
4.2 Increasing the Outputs 6
5
Technical Specifications 8
Figures
Figure 1: VM-25 1:25 Video Distribution Amplifier 3
Figure 2: Connecting the VM-25 5
Figure 3: Increasing the Outputs: Arranging a 1:75 Video DA 7
Tables
Table 1: Front Panel VM-25 Video Distribution Amplifier Features 4
Table 2: Rear Panel VM-25 Video Distribution Amplifier Features 4
Table 3: Technical Specifications of the VM-25 Video Distribution Amplifier 8
i
9999992 A1
ADDENDUM (this data is included at the end of the Overview section)
This addendum adds the following information to the user manual:
Caution – No operator-serviceable parts inside unit.
Warning – Use only the Kramer Electronics input power
wall adapter that is provided with this unit1.
Warning – Disconnect power and unplug unit from wall
before installing or removing device or servicing unit.
1 For example: model number AD2512C, part number 2535-000251
2900-
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
350-plus different models now appear in 8 Groups1, which are clearly defined
by function.
Congratulations on purchasing your Kramer VM-25 1:25 Video Distribution
Amplifier. The VM-25 is ideal for:
Composite video signal distribution
Video duplication studios, delivering undiminished quality duplicates
Each package includes the following items:
VM-25 1:25 Video Distribution Amplifier
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
3 Overview
The VM-25 is a high quality 1:25 distribution amplifier for composite video.
The VM-25 accepts a composite video input and distributes the signal to 25
identical outputs, using RCA connectors.
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 our Web site at http://www.kramerelectronics.com
3 The complete list of Kramer cables is on our Web site at http://www.kramerelectronics.com
1
Overview
In particular, the VM-25:
Includes a looping connector for connecting to a local monitor, other
acceptor, or for forming larger systems1
Has a video bandwidth of more than 430MHZ, ensuring transparent
performance with typical video sources
Has front panel video trimmer controls2 for output level (LEVEL) and
cable equalization (EQ.)
Achieving the best performance means:
Connecting 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)
Avoiding interference from neighboring electrical appliances and
positioning your VM-25 away from moisture, excessive sunlight and dust
Figure 1 and Table 1 define the VM-25 1:25 Video Distribution Amplifier:
1 For example, you can connect 3 VM-25 units to make a 1:75 video distribution amplifier. See section 4.2 for details
2 The video outputs are arranged in two blocks of 5 outputs (outputs 1 to 5, and outputs 6 to 10). Each block can be separately
trimmed for output level and cable equalization (EQ.) thus achieving different compensations for different cable lengths
2
KRAMER: SIMPLE CREATIVE TECHNOLOGY
3
Overview
Figure 1: VM-25 1:25 Video Distribution Amplifier
Using the VM-25 Video Distribution Amplifier
Table 1: Front Panel VM-25 Video Distribution Amplifier Features
# Feature Function
1 POWER Switch Illuminated switch supplying power to the unit
2 EQ. Trimmer Adjusts1 the video EQ. (equalization) compensation of outputs 21 to 25
3 LEVEL Trimmer Adjusts1 the video signal level of outputs 21 to 25
4 EQ. Trimmer Adjusts1 the video EQ. (equalization) compensation of outputs 16 to 20
5 LEVEL Trimmer Adjusts1 the video signal level of outputs 16 to 20
6 EQ. Trimmer Adjusts1 the video EQ. (equalization) compensation of outputs 11 to 15
7 LEVEL Trimmer Adjusts1 the video signal level of outputs 11 to 15
8 EQ. Trimmer Adjusts1 the video EQ. (equalization) compensation of outputs 6 to 10
9 LEVEL Trimmer Adjusts1 the video signal level of outputs 6 to 10
10 EQ. Trimmer Adjusts1 the video EQ. (equalization) compensation of outputs 1 to 5
11 LEVEL Trimmer Adjusts1 the video signal level of outputs 1 to 5
12 TERMINATION Button
Pushing in selects 75, releasing selects Hi-Z2
Table 2: Rear Panel VM-25 Video Distribution Amplifier Features
# Feature Function
13 INPUT RCA Connector Connects to the video source
14 LOOP RCA Connector For looping (if required)
15 OUT RCA Connectors Connect to the composite video acceptors (from 1 to 25)
16 12 V DC IN +12V DC connector for powering the unit
4 Using the VM-25 Video Distribution Amplifier
You can connect:
A single VM-25 unit (see section 4.1)
Several VM-25 units to increase the number of outputs (see section 4.2)
4.1 Connecting a VM-25 Video Distribution Amplifier
To connect the VM-25 as a 1:25 video DA3 (see Figure 2), do the following4:
1. Connect a composite video source (for example, a composite video
player) to the INPUT RCA connector.
2. Connect up to 25 OUT RCA connectors5 to the video acceptors (for
example, composite video displays).
1 Insert a screwdriver into the hole and carefully rotate it, to trim the level
2 For looping, select Hi-Z
3
DA is Distribution Amplifier
4 Switch OFF the power on each device before connecting it to your VM-25. After con necting your VM-25, switch on its
power and then switch on the power on each device
5 As required. Up to 25 outputs can be connected on the VM-25. Not all outputs need to be connected
4
KRAMER: SIMPLE CREATIVE TECHNOLOGY
Using the VM-25 Video Distribution Amplifier
Display 25
3. Connect the 12V DC power adapter to the power socket on the VM-25,
and plug the adapter into the mains electricity socket.
4. Push in the TERMINATION button1 to terminate the line to 75.
5. If required, adjust2 the video trimmer controls3 for output signal level
and/or cable compensation equalization level.
Composite Video
Player
Display 1
Figure 2: Connecting the VM-25
1 Since the LOOP output is not being used in this example
2 Insert a screwdriver into the hole and carefully rotate it, to trim the level
3 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
5
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 following1:
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 acceptors2 1 to 25
Second VM-25 unit to the video acceptors2 26 to 50
Third VM-25 unit to the video acceptors2 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, adjust3 the video trimmer controls4 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
6
KRAMER: SIMPLE CREATIVE TECHNOLOGY
Composite Video Player
Display 1 Display 25
…
…
…
Using the VM-25 Video Distribution Amplifier
Display 26 Display 50
Display 51 Display 75
Figure 3: Increasing the Outputs: Arranging a 1:75 Video DA
7
Technical Specifications
5 Technical Specifications
Table 3 includes the technical specifications:
Table 3: Technical Specifications1 of the VM-25 Video Distribution Amplifier
INPUTS: 1 composite video, 1 looping on RCA connectors
OUTPUTS: 25 composite video, on RCA connectors
MAX. OUTPUT LEVEL: 1.7Vpp
BANDWIDTH (-3dB): 433MHz
DIFF. GAIN: 0.08%
DIFF. PHASE: 0.005 Deg.
K-FACTOR: <0.05%
S/N RATIO: 74dB RMS
CONTROLS: Front panel accessible trimmers for video level (-1.2dB to +6.2dB) and EQ.
COUPLING: AC
POWER SOURCE: 12VDC x 162 mA
DIMENSIONS: 19-inch (W), 7-inch (D), 1U (H)
WEIGHT: 2.1kg (4.7 lbs.) approx.
ACCESSORIES: Power supply
(0dB to +8. dB) @ 50 MHz
1 Specifications are subject to change without notice
8
KRAMER: SIMPLE CREATIVE TECHNOLOGY
LIMITED WARRANTY
Kramer Electronics (hereafter Kramer) warrants this product free from defects in material and workmanship under the
following terms.
HOW LONG IS THE WARRANTY
Labor and parts are warranted for three years from the date of the first customer purchase.
WHO IS PROTECTED?
Only the first purchase customer may enforce this warranty.
WHAT IS COVERED AND WHAT IS NOT COVERED
Except as below, this warranty covers all defects in material or workmanship in this product. The following are not covered
by the warranty:
1. Any product which is not distributed by Kramer, or which is not purchased from an authorized Kramer d ealer. If you are
uncertain as to whether a dealer is authorized, p lease co ntact Kramer at one of the agents listed in the Web site
www.kramerelectronics.com.
2. Any pro duct, on which the serial number has been defaced, modified or removed.
3. Da mage, deterioration or malfunction resulting from:
i) Accident, misuse, abuse, neglect, fire, water, lightning or other acts of nature
ii) Product modification, or failure to follow instructions supplied with the product
iii) Repair or attempted repair by anyone not authorized by Kramer
iv) Any shipment of the product (claims must be presented to the carrier)
v) Removal or installation of the product
vi) Any other cause, which does not relate to a product defect
vii) Cartons, equipment enclosures, cables or accessories used in conjunction with the product
WHAT WE WILL PAY FOR AND WHAT WE WILL NOT PAY FOR
We will pay labor and material expenses for covered items. We will not pay for the following:
1. Re moval or installations charges.
2. Co sts of initial technical adjustments (set-up), including adjustment of user controls or programming. These costs are the
responsibility of the Kramer dealer from whom the product was purchased.
3. Shipping charges.
HOW YOU CAN GET WARRANTY SERVICE
1. T o obtain service on you product, you must take or ship it prepaid to any authorized Kramer service center.
2. Whene ver warranty service is required, the original dated invoice (o r a co py) must be presented as proof of warranty coverage,
and should be included in any shipment of the product. Please also include in any mailing a contact name, company, address, and
a description of the problem(s).
3. For the name of the nearest Kramer authorized service center, consult your authorized dealer.
LIMITATION OF IMPLIED WARRANTIES
All implied warranties, including warranties of merchantability and fitness for a particular purpose, are limited in duration to
the length of this warranty.
EXCLUSION OF DAMAGES
The liability of Kra mer for any eff ective products is limited to the repair or replace ment of the product at our option. Kramer
shall not be liable for:
1. Da mage to other pro perty caused by defects in this product, damages based upon inconve nience, loss of use of the product , loss
of time, commercial loss; or:
2. Any other damages, whether incidental, consequential or otherwise. Some countries may not allow limitations o n how long an
implied warranty lasts and/or do not allow the exclusion or limitation of incidental or consequential damages, so the above
limitations and exclusions may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights, which vary from place to place.
NOTE: All products returned to Kramer for service must have prior approval. This may be obtained from your dealer.
This equipment has been tested to determine compliance with the requirements of:
EN-50081: "Electromagnetic compatibility (EMC);
EN-50082: "Electromagnetic compatibility (EMC) generic immunity standard.
CFR-47: FCC Rules and Regulations:
CAUTION!
Servicing the machines can only be done by an authorized Kramer technician. Any user who makes changes or modifications to
the unit without the expressed approval of the manufacturer will void user authority to operate the equipment.
Use the supplied DC power supply to feed power to the machine.
Please use recommended interconnection cables to connect the machine to other components.
generic emission standard.
Part 1: Residential, commercial and light industry"
Part 1: Residential, commercial and light industry environment".
Part 15: “Radio frequency devices
Subpart B – Unintentional radiators”
9
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.
Kramer Electronics, Ltd.
Web site: www.kramerelectronics.com
E-mail: info@kramerel.com
P/N: 2900-000036 REV 1
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