Kramer Electronics, Ltd.
USER MANUAL
Model:
Cobra TA
Video / Audio Transmitter
Contents
i
Contents
1
Introduction 1
2
Getting Started 1
3
Overview 1
4
Setup and Installation 3
4.1
Making the Connections 3
4.2
Connecting the Cobra TA Video / Audio Transmitter 4
4.3
Typical Single-Port Transmitter–Receiver Application 5
5
Solutions to Common Problems 6
6
Technical Specifications 7
Figures
Figure 1: Connecting the Cobra TA Video / Audio Transmitter 4
Figure 2: Connecting the Cobra Receiver 4
Figure 3: Transmitter to Receiver Connections 5
Tables
Table 1: Technical Specifications of the Cobra TA Video / Audio Transmitter 7
Table 2: HD15 PINOUT 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 Groups1, which are clearly defined
by function.
Congratulations on purchasing your Kramer TOOLS Cobra TA Video / Audio
Transmitter, which extends VGA and audio signals over ordinary CAT5e
cable.
The package includes the Cobra TA Video / Audio Transmitter and 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 cables
3
. You may
also need 1/8” (3.5mm) audio cable, video cable with HD15 connectors,
and CAT5 cable
The Kramer Cobra series products are not compatible with Kramer non-Cobra
series products.
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.
We recommend using our Kramer Cobra ultra low skew cable—BC-HDTP
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
(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 TA 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 unit1.
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
With regard to connecting the cables:
We recommend mounting and connecting all cabling to the Cobra TA
Video / Audio Transmitter 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).
4.1 Making the Connections
This section contains figures showing connections with the specific Cobra
Series models. In general, however, 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 TA Series transmitter video input
port, which is an HD15 connector labeled VIDEO INPUT.
2. Make your audio connections via the 1/8” (3.5mm) audio connector.
3. Connect the CAT5 cable to the transmitter.
4. Apply power on the transmitter. The LED should light.
At the receiver end (refer to the receiver user manual):
1. Connect the VIDEO OUTPUT HD15 connector to the display unit.
2. Connect a 1/8” (3.5mm) 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 appropriate section in receiver user manual.
KRAMER: SIMPLE CREATIVE TECHNOLOGY
Setup and Installation
4
4.2 Connecting the Cobra TA Video / Audio Transmitter
The Cobra TA Video / Audio Transmitter supports video and audio signals
over CAT5 cable. The audio signal is line-level audio, and powered speakers
are required. Figure 1 shows the Cobra TA Video / Audio Transmitter
connections, and Figure 2 shows a typical Cobra receiver connection.
Figure 1: Connecting the Cobra TA Video / Audio Transmitter
Figure 2: Connecting the Cobra Receiver
Setup and Installation
5
4.3 Typical Single-Port Transmitter–Receiver Application
Figure 3 shows a typical application in which the Cobra TA Video / Audio
Transmitter is connected over CAT5 to a receiver.
Figure 3: Transmitter to Receiver Connections
KRAMER: SIMPLE CREATIVE TECHNOLOGY
Solutions to Common Problems
6
5 Solutions to Common Problems
There are no user configurable settings on the Cobra TA Video / Audio
Transmitter. In most cases, nearly every issue with the Cobra Series can be
resolved by checking the CAT5 termination and making sure that it is pinned
to the 568B wiring specification. However, there may be other problems that
cause the system to not perform as it is 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?
Note, that if cable EQ adjustment is too high, or too low, for a
given cable length, an image may not appear.
Problem:
Poor video quality.
Solution:
Have all receiver adjustments been finished?
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 DAs, 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.
Technical Specifications
7
6 Technical Specifications
Table 1: Technical Specifications1 of the Cobra TA Video / Audio Transmitter
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:
To 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: (1) 3.5-mm, (1) RJ-45, (1) HD15 F
TEMPERATURE
TOLERANCE:
Operating: 32 to 104°F (0 to 55°C);
Storage: -4 to +140°F (-20 to +60°C)
HUMIDITY
TOLERANCE:
Up to 80% noncondensing
ENCLOSURE: Steel
POWER: +5 VDC @ 260 mA max
Consumption: 1.3 watts maximum
SIZE: 1.38 "H x 3.62"W x 4.38"D (3.5 x 9.2 x 11.1 cm)
WEIGHT: 0.62 lb. (0.28 kg)
1 Specifications are subject to change without notice
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Technical Specifications
8
Appendix A Cabling Pinouts
Table 2: HD15 PINOUT
Pin RGBHV
(VGA)
RGBS RGsB Composite SVHS
(Y/C)
YUV Composite Video
and Stereo Audio
1 Red + Red + Red + C+ V+ Audio
2 Green+ Green+ Green+ C+ Y+ Y+ C+
3 Blue+ Blue+ Blue+ U+ Audio
4 — — —
5 Gnd Gnd Gnd
6 Red- Red- Red- C- V- Shield
7 Green- Green- Green- C- Y- Y- C8 Blue- Blue- Blue- U- Shield
9 — — —
10 Gnd Gnd —
11 Gnd Gnd —
12 — — —
13 H Sync C Sync —
14 V Sync — —
15 Gnd Gnd —
Technical Specifications
9
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10
Kramer Electronics, Ltd.
Web site: www.kramerelectronics.com
E-mail: info@kramerel.com
P/N: 2900-650007 REV
2
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.
Caution
Safety Warning:
Disconnect the unit from the power supply before
opening/servicing.
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