Kramer Electronics, Ltd.
USER MANUAL
VM-20HD
Dual 1:10 HD/SD – SDI Distribution Amplifier
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 Kramer VM-20HD Dual 1:10 HD2/SD3 -
SDI Distribution Amplifier, which is ideal for:
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SDI production studios for signal distribution
Broadcast studios for on-air operation
SDI field production
Using with SDI video sources such as professional digital cameras
The package includes the following items:
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VM-20HD Dual 1:10 HD/SD - SDI Distribution Amplifier
Power cord
This user manual4
2 Getting Started
We recommend that you:
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Unpack the equipment carefully and save the original box and packaging
materials for possible future shipment
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Review the contents of this user manual
Use Kramer high performance high resolution cables5
2.1 Quick Start
This quick start chart summarizes the basic setup and operation steps.
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 High Definition (HD) means a video format, consisting of either 720 active lines of progressive video or 1080 lines of either
progressive or interlaced video
3 Standard Definition (SD) means an NTSC or PAL compatible video format, consisting of 480 (for NTSC) or 576 (for PAL)
lines of interlaced video
1
Getting Started
KRAMER: SIMPLE CREATIVE TECHNOLOGY
2
Overview
3 Overview
The VM-20HD Dual 1:10 HD/SD - SDI Distribution Amplifier is a high
performance dual channel distribution amplifier for SDI (SMPTE 259M and
SMPTE 344M) and HD-SDI (SMPTE 292M) signals. It will take one input
per channel, provide reclocking and equalization and distribute each signal to
10 outputs, using BNC connectors.
In particular, the VM-20HD:
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Can be configured as a 1:20 DA
Has an active loop BNC connector on each channel, for cascading
additional units
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Has a video bandwidth of 1.485Gbps that allows it to be used for standard
definition and high definition serial digital video signals (SD/HD-SDI)
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Is SMPTE 259M, 292M and 344M compliant
Supports data rates of 270, 1483.5, and 1485Mbps
Provides automatic, multi-rate, equalization and reclocking for losses
typical with long runs of 75W co-axial cable
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Has HD and SD output indication LEDs for each channel
To achieve the best performance:
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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)
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Avoid interference from neighboring electrical appliances and position
your Kramer VM-20HD away from moisture, excessive sunlight and dust
4 Your VM-20HD Dual 1:10 HD/SD - SDI Distribution Amplifier
Figure 1 and Table 1 define the VM-20HD Dual 1:10 HD/SD - SDI
Distribution Amplifier:
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Your VM-20HD Dual 1:10 HD/SD - SDI Distribution Amplifier
Figure 1: VM-20HD Dual 1:10 HD/SD - SDI Distribution Amplifier
KRAMER: SIMPLE CREATIVE TECHNOLOGY
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Your VM-20HD Dual 1:10 HD/SD - SDI Distribution Amplifier
Table 1: VM-20HD Dual 1:10 HD/SD - SDI Distribution Amplifier Features
#
Feature
POWER Switch
Function
1
2
3
4
5
6
7
Illuminated switch for turning the unit ON or OFF
The green LED lights when the SDI signal in channel A is SD
The blue LED lights when the SDI signal in channel A is HD
The blue LED lights when the SDI signal in channel B is HD
The green LED lights when the SDI signal in channel B is SD
Connects to the channel B SDI source
SD1 LED
HD2 LED
HD2 LED
SD1 LED
VIDEO IN
CHANNEL A
CHANNEL B
CHANNEL B LOOP
Connects the channel B input to the video input of an
BNC
additional unit or to the channel A video input3
Connectors
8
9
VIDEO
Connects to the channel B SDI acceptors (from 1 to 10)
Connects to the channel A SDI source
OUTPUTS
VIDEO IN
10
11
12
CHANNEL A LOOP
Connects the channel A input to the video input of an
BNC
additional unit or to the channel B video input3
Connectors
VIDEO
Connects to the channel A SDI acceptors (from 1 to 10)
AC connector enabling power supply to the unit
OUTPUTS
Power Connector with Fuse
1 Standard Definition (SD) means an NTSC or PAL compatible video format, consisting of 480 (for NTSC) or 576 (for PAL)
lines of interlaced video
2 High Definition (HD) means a video format, consisting of either 720 active lines of progressive video or 1080 lines of either
progressive or interlaced video
3 To create a 1:20 distribution amplifier (connect the LOOP output of one of the channels to the VIDEO IN of the other
channel)
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Installing the VM-20HD on a Rack
5 Installing the VM-20HD on a Rack
This section describes what to do before installing on a rack and how to rack
mount.
Before Installing on a Rack
How to Rack Mount
To rack-mount a machine:
Before installing on a rack, be sure that the environment is
within the recommended range:
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Attach both ear brackets to the
machine. To do so, remove the
screws from each side of the machine
(3 on each side), and replace those
screws through the ear brackets.
Operating temperature range +5 to +45 Deg. Centigrade
5 to 65% RHL, non-condensing
-20 to +70 Deg. Centigrade
Operating humidity range
Storage temperature range
Storage humidity range
5 to 95% RHL, non-condensing
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CAUTION!!
When installing on a 19" rack, avoid hazards by taking
care that:
1
It is located within the recommended environmental
conditions, as the operating ambient temperature of a
closed or multi unit rack assembly may exceed the
room ambient temperature.
2
Place the ears of the machine
against the rack rails, and insert the
proper screws (not provided) through
each of the four holes in the rack
ears.
Once rack mounted, enough air will still flow around the
machine.
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3
The machine is placed straight in the correct horizontal
position.
Note that:
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You do not overload the circuit(s). When connecting
the machine to the supply circuit, overloading the
circuits might have a detrimental effect on overcurrent
protection and supply wiring. Refer to the appropriate
nameplate ratings for information. For example, for
fuse replacement, see the value printed on the product
label.
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In some models, the front panel
may feature built-in rack ears
Detachable rack ears can be removed
for desktop use
Always mount the machine in the rack
before you attach any cables or
connect the machine to the power
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The machine is earthed (grounded) in a reliable way
and is connected only to an electricity socket with
grounding. Pay particular attention to supply
connections other than direct connections to the
branch circuit (for example, the use of power strips),
and that you use only the power cord that is supplied
with the machine.
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If you are using a Kramer rack adapter
kit (for a machine that is not 19"), see
the Rack Adapters user manual for
installation instructions (you can
download it at:
http://www.kramerelectronics.com)
KRAMER: SIMPLE CREATIVE TECHNOLOGY
6
Connecting the VM-20HD Dual 1:10 HD/SD - SDI Distribution Amplifier
6 Connecting the VM-20HD Dual 1:10 HD/SD - SDI Distribution
Amplifier
To connect the VM-20HD, as the example in Figure 2 illustrates, do the following1:
1. Connect an HD-SDI/SD-SDI video source (for example, an HD/SD SDI
camera) to the CHANNEL A VIDEO IN BNC connector.
2. Connect the CHANNEL A LOOP BNC connector to the CHANNEL B
VIDEO IN BNC connector.
3. Connect up to2 20 VIDEO OUTPUT BNC connectors to the appropriate
HD/SD SDI video acceptors (for example, HD/SD SDI displays).
4. Connect the power cord (not illustrated in Figure 2).
Figure 2: Connecting the VM-20HD Dual 1:10 HD/SD - SDI Distribution Amplifier
1 Switch OFF the power on each device before connecting it to your VM-20HD. After connecting your VM-20HD, switch on
its power and then switch on the power on each device
2 You do not have to connect all the outputs, connect only those that are required and leave the other output(s) unconnected
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Technical Specifications
7 Technical Specifications
Table 2 includes the technical specifications:
Table 2: Technical Specifications1 of the VM-20HD
INPUTS:
2 SMPTE-259M, 292M, 344M serial video, 75 ohms on a BNC
connector
OUTPUTS:
22 equalized and reclocked SMPTE-259M, 292M, 344M outputs,
75 ohms on BNC connectors
RESOLUTION:
8 and 10-bits (automatic)
MAX. OUTPUT LEVEL: 800mVpp /75 ohms
MAX. BAUD RATE:
COUPLING:
1.485Gbps
AC
POWER SOURCE:
DIMENSIONS:
WEIGHT:
100-240VAC; 50/60Hz, 9VA
19-inch (W), 7-inch (D), 1U (H)
1.5kg. (3.3lbs.) approx.
Power cord
ACCESSORIES:
1 Specifications are subject to change without notice
KRAMER: SIMPLE CREATIVE TECHNOLOGY
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LIMITED WARRANTY
Kramer Electronics (hereafter Kramer) warrants this product free from defects in material and workmanship under the
followingterms.
HOW LONGIS THE WARRANTY
Labor and parts are warranted for seven years from the date of the first customer purchase.
WHOIS PROTECTED?
Only the first purchase customer may enforce this warranty.
WHAT ISCOVEREDANDWHAT ISNOT COVERED
Except as below, this warranty covers all defects in material or workmanship in this product. The following are not covered
by thewarranty:
1. Any product which is not distributed by Kramer, or which is not purchased from an authorized Kramer dealer. If you are
uncertain as to whether a dealer is authorized, please contact Kramer at one of the agents listed in the Web site
2. Any product,on which theserial numberhas been defaced, modifiedor removed.
3. Damage, deteriorationormalfunctionresultingfrom:
i) Accident, misuse, abuse, neglect, fire, water, lightning orother acts ofnature
ii) Product modification, orfailuretofollowinstructions suppliedwith theproduct
iii) Repairorattemptedrepair by anyonenot authorized byKramer
iv) Anyshipment of theproduct(claims must bepresentedtothe carrier)
v) Removalor installationof theproduct
vi) Anyothercause, whichdoes not relateto aproduct defect
vii) Cartons, equipment enclosures, cables or accessoriesusedinconjunctionwiththeproduct
WHAT WE WILLPAYFORAND WHAT WE WILLNOT PAYFOR
Wewill pay laborand material expensesforcovereditems.Wewill notpayforthefollowing:
1. Removal orinstallationscharges.
2. Costs of initial technical adjustments (set-up), including adjustment of user controls or programming. These costs are the
responsibility oftheKramerdealer fromwhomthe product was purchased.
3. Shipping charges.
HOW YOU CAN GET WARRANTY SERVICE
1. To obtain service on you product, you must take or ship it prepaid to any authorized Kramer service center.
2. Whenever warranty service is required, the original dated invoice (or a copy) 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 OFIMPLIED WARRANTIES
All implied warranties, including warranties of merchantability and fitness for a particular purpose, are limited in duration to
the length of this warranty.
EXCLUSIONOFDAMAGES
The liability of Kramer for any effective products is limited to the repair or replacement of the product at our option. Kramer shall
not beliable for:
1. Damage to otherproperty caused by defects inthis product, damages basedupon inconvenience, loss ofuseof theproduct, loss
oftime, commercial loss;or:
2. Any other damages, whether incidental, consequential or otherwise. Some countries may not allow limitations on howlong an
implied warranty lasts and/or do not allow the exclusion or limitation of incidental or consequential damages, so the above
limitations andexclusions maynot applytoyou.
Thiswarranty gives youspecificlegalrights, andyou may alsohaveotherrights, which varyfromplacetoplace.
NOTE:Allproducts returned to Kramerfor servicemust haveprior approval.Thismay be obtainedfromyourdealer.
Thisequipment has been testedtodeterminecompliancewiththerequirements of:
EN-50081:
"Electromagneticcompatibility(EMC);
genericemissionstandard.
Part 1: Residential, commercial and lightindustry"
"Electromagneticcompatibility(EMC) genericimmunitystandard.
Part 1: Residential, commercialand lightindustryenvironment".
FCC Rules and Regulations:
EN-50082:
CFR-47:
Part 15: “Radio frequency devices
Subpart B Unintentional radiators”
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 thesuppliedDCpower supplytofeedpowerto themachine.
Pleaseuserecommended interconnection cablestoconnect themachineto other components.
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For the latest information on our products and a list of Kramer
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.
E-mail: [email protected]
P/N: 2900-000321 REV 2
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