Kramer TWA User manual

Kramer Electronics, Ltd.
USER MANUAL
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
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Model:
Cobra TWA

Contents
i
Contents
1 Introduction 1
2 Getting Started 1
3 Overview 1
4 Setup and Installation 3
4.1 Connections on the Cobra TWA 4
4.2 Installing the Cobra TWA 4
4.3 Powering the Cobra TWA 4
5 Solutions to Common Problems 5
6 Technical Specifications 8
Figures
Figure 1: Connecting the Cobra TWA Transmitter 4
Tables
Table 1: HD15 Video Connector PINOUT 6
Table 2: T568B CAT5 PINOUT 7
Table 3: Technical Specifications of the Cobra TWA 8

Introduction
1
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 Groups
1
, which are clearly defined
by function.
Congratulations on purchasing your Kramer Cobra TWA. The Kramer Cobra
Series System extends VGA and audio signals over ordinary Category 5
cable. For information on the respective receiver units, refer to the
appropriate manual included with the receiver.
The package includes the Cobra TWA and this user manual
2
.
The Kramer Cobra series products are not compatible with Kramer non-Cobra
series products.
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 cables
3
. You may
also need CAT5 cable
3 Overview
Our Kramer Cobra series products are compatible with Cat5/5e/6 data
cabling as well as skew free CAT5/5e cabling manufactured for video
applications. Note that some skew free Cat5 is specific to a particular vendor
and is not compatible with our products. Ensure any skew free CAT5 cable is
non-proprietary prior to purchase / installation.
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

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Overview
2
We recommend using our Kramer Cobra ultra low skew cable—BC-HDTP
(solid bulk) or BCP-HDTP (solid plenum bulk)—available in lengths of 700'
(210m) and 1300' (390m).
CAT6 cable, due to the manufacture method, can exhibit much greater skew
than standard CAT5/5e and may require skew compensation beyond what the
standard product offers. Contact Kramer Electronics for assistance.
CAT5/5e/6 cabling for this product must be pinned to the TIA-EIA T568B
wiring specification (see appendix A). We also highly recommend that all
CAT5 cables be pre-terminated and tested. Cables terminated on-site or in an
existing infrastructure should be tested before use to ensure compliance with
the TIA-EIA T568B specification. Using incorrectly terminated CAT5 cables
can damage this product.
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 that may
adversely influence signal quality and positioning your Cobra TWA in a
location free from moisture and away from excessive sunlight and dust
Caution – No operator-serviceable parts inside unit.
Warning – Use only the Kramer Electronics input power
wall adapter that is provided with this unit
1
.
Warning – Disconnect power and unplug unit from wall
before installing or removing device or servicing unit.
Warning –This equipment is not intended for, nor does it
support, distribution through an Ethernet network. Do not
connect these devices to any sort of networking or
telecommunications equipment!
1 For example: model number AD2512C, part number 2535-000251

Setup and Installation
3
4 Setup and Installation
The section describes how to setup and install the Cobra TWA. In general, the
connection and setup procedure at both transmitter and receiver ends is as
follows:
At the transmitter end:
1. Connect the source video to the Cobra Series transmitter video input port,
which is an HD15 connector labeled VIDEO. Adapter cables may be
necessary if using component, s-video, or composite signals.
2. Make your audio connections via the 1/8” (3.5 mm) AUDIO connector.
3. Connect the CAT5 cable to the rear of the transmitter.
4. Apply power on the transmitter. The LED should light.
5. When the transmitter has been tested and is functioning normally,
complete installation into a US style wall box or low voltage J-Box.
At the receiver end (refer to the receiver user guide):
1. Connect the VIDEO OUTPUT HD15 connector to the display unit.
2. Connect a 1/8” (3.5 mm) audio cable to the AUDIO OUTPUT connection.
3. Connect the CAT5 cable to the UTP connection.
4. Apply power. The LED should light and video should appear on the display
(make sure display is powered ON).
5. To adjust video levels see the appropriate section in receiver user manual.
With regard to connecting the cables:
We recommend mounting and connecting all cabling to the Cobra TWA
components before applying power.
Be sure that the CAT5 cable you intend to use has been tested to comply
with the T568B wiring specification (see Appendix A).

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Setup and Installation
4
4.1 Connections on the Cobra TWA
The Cobra TWA transmitter supports video and audio signals over CAT5
cable. The audio signal is line-level R/L summed and powered speakers are
required. Figure 1 shows the Cobra TWA transmitter connections.
Figure 1: Connecting the Cobra TWA Transmitter
4.2 Installing the Cobra TWA
The Cobra TWA transmitter can be installed into a 1 gang electrical wall box
and fits a standard Decora wall plate cover.
The installation must conform to national and local electrical codes.
4.3 Powering the Cobra TWA
The Cobra TWA is designed to be powered by a 12VDC power supply.
NOTE:
Observe proper polarity when connecting the power supply to the unit.
Ensure the positive + lead is connected to the positive + side of the
connector. Incorrectly wiring the power connector will damage the unit.

Solutions to Common Problems
5
5 Solutions to Common Problems
There are no user configurable settings on the Cobra TWA.
In most cases, nearly every issue with the Cobra Series can be resolved by
checking the CAT5 termination and making sure that it’s pinned to the 568B
wiring specification. However, there may be other problems that cause the
system to not perform as it’s designed. Below are solutions to the most
common installation errors.
Problem:
No video signal at the receiver.
Solution:
Check that both units are powered.
Ensure Cable Length Compensation adjustments are set
correctly on the receiver.
Make sure the CAT5 cable is terminated correctly per the 568B
wiring specification.
Is the display device powered on and functioning?
Problem:
Poor video quality.
Solution:
Have all receiver adjustments been performed?
Check all cable connections.
Ensure Cable Length Compensation adjustments are set
correctly on the receiver.
The video signal’s refresh rate may be set too high for the display.
Reset to a lower refresh rate in your monitor-configuration menu.
Problem:
Poor audio quality.
Solution:
Powered speakers are required. Make sure speaker power is ON.
Check input source levels from the source device. Make sure the
audio source is not overdriven or underdriven.
Problem:
“Green shift” or “green washout” on multimedia signals.
Solution:
The standard video model is designed to function with DC
coupled signals in which the black level is referenced to 0 volts.
Nearly all VGA cards function this way.
Some media servers and VGA DA’s, however, provide AC
coupled signals and can cause a green color shift in the video. This
is a result of the sync clamping on the red and blue channels of the
transmitter/receiver units.
For five-component (RGB/H&V) AC coupled video, the Cobra
Transmitter unit has been designed with full DC restoration
capability. The Cobra TWA may need to be replaced with a
Universal transmitter

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Solutions to Common Problems
6
Appendix A Cabling Pinouts
Table 1: HD15 Video Connector PINOUT
Pin RGBHV
(VGA) RGBS RGsB Composite
SVHS
(Y/C)
YUV
1 Red + Red + Red + C+ V+
2 Green+ Green+ Green+ C+ Y+ Y+
3 Blue+ Blue+ Blue+ U+
4 — — —
5 Gnd Gnd Gnd
6 Red- Red- Red- C- V-
7 Green- Green- Green- C- Y- Y-
8 Blue- Blue- Blue- U-
9 — — —
10 Gnd Gnd —
11 Gnd Gnd —
12 — — —
13 H Sync C Sync —
14 V Sync — —
15 Gnd Gnd —

Solutions to Common Problems
7
Table 2: T568B CAT5 PINOUT

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Technical Specifications
8
6 Technical Specifications
Table 3: Technical Specifications
1
of the Cobra TWA
CABLE REQUIRED: Category 5, 5e, 6 shielded or unshielded twisted pair
COMPLIANCE: CE; FCC Class A, IC Class/class A
VIDEO SUPPORT: RGBHV, RGB, Composite, S-Video, Component Video modes
MAXIMUM RESOLUTION AND
REFRESH RATE 1920x1200 @ 60Hz (receiver dependent)
REQUIRED SOURCE IMPEDANCE: Video OUT: 75 ohms
Audio OUT: 600 ohms maximum
REQUIRED DESTINATION
IMPEDANCE: Video IN: 75 ohms;
Audio IN: 600 ohms minimum
AUDIO CHARACTERISTICS: Channels: Right/Left summed;
Line Level 600 Ohm Unbalanced
CONNECTORS: Front mount : (1) 3.5-mm, (1) HD15 F
RearMount:(1)RJ-45,(1)2pinterminal block powerinput
TEMPERATURE TOLERANCE: Operating: 32 to 104°F (0 to 40°C);
Storage: -4 to +140°F (-20 to +60°C)
HUMIDITY TOLERANCE: Up to 80% noncondensing
ENCLOSURE: Fits any standard US style wall box or low voltage J-Box
POWER: +12 VDC @ 180 mA max
Consumption: 2.2 watts maximum
SIZE: 2.6” H* x 1.3” W x 2.28” D (Decora Style)
(6.6 cm H* x 3.3 cm W x 5.8 cm D)
Fits in a 1-gang Decora faceplate.
* Height is 3.8” (9.7 cm) including mounting tabs
Dimensions do not include wall plate
WEIGHT: 0.09 lb. (0.04 kg)
1 Specifications are subject to change without notice