Kramer KRT-4-USBC User manual

P/N: 2900-301295 Rev 5 www.KramerAV.com
USER MANUAL
MODEL:
KRT-4
Cable Retractor

Kramer Electronics Ltd.
KRT-4 –Contents
i
Contents
Introduction 1
Getting Started 1
Overview 2
Typical Applications 2
Defining the KRT-4 Cable Retractor 3
KRT-4-3H2 Features 4
Installing KRT-4 5
Attaching KRT-4 to the Underside of a Table 5
Attaching KRT-4 to a TBUS 6
Connecting to the KRT-4 11
Technical Specifications 12
KRT-4-3H2 Extender Additional Specifications 12
KRT-4 Outline Dimensions with TBUS 13

Kramer Electronics Ltd.
KRT-4 –Introduction
1
Introduction
Welcome to Kramer Electronics! Since 1981, Kramer Electronics has been providing a world
of unique, creative, and affordable solutions to the vast range of problems that confront the
video, audio, presentation, and broadcasting professional on a daily basis. In recent years, we
have redesigned and upgraded most of our line, making the best even better!
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.
Go to www.kramerav.com/downloads/KRT-4 to check for up-to-date user manuals, application
programs, and to check if firmware upgrades are available (where appropriate).
Achieving the Best Performance
•Use only good quality connection cables (we recommend Kramer high-performance,
high-resolution cables) to avoid interference, deterioration in signal quality due to poor
matching, and elevated noise levels (often associated with low quality cables).
•Do not secure the cables in tight bundles or roll the slack into tight coils.
•Avoid interference from neighboring electrical appliances that may adversely influence
signal quality.
•Position your Kramer KRT-4 away from moisture, excessive sunlight and dust.
Safety Instructions
Caution:
•This equipment is to be used only inside a building. It may only be connected to other
equipment that is installed inside a building.
•There are no operator serviceable parts inside the unit.
Recycling Kramer Products
The Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC aims to reduce
the amount of WEEE sent for disposal to landfill or incineration by requiring it to be collected
and recycled. To comply with the WEEE Directive, Kramer Electronics has made
arrangements with the European Advanced Recycling Network (EARN) and will cover any
costs of treatment, recycling and recovery of waste Kramer Electronics branded equipment on
arrival at the EARN facility. For details of Kramer’s recycling arrangements in your particular
country go to our recycling pages at www.kramerav.com/support/recycling.

Kramer Electronics Ltd.
KRT-4 –Introduction
2
Overview
KRT-4 is a cable retractor, with a gentle retraction mechanism, that is designed for installing
in a meeting room, classroom or other AV site. You can furniture-mount KRT-4 or install one
or more KRT-4 units in conjunction with a Kramer TBUS unit, such as TBUS-1AXL,
TBUS-10XL, UTBUS-1XL, UTBUS-2XL and more. KRT-4 extends a variety of common AV
connector types and is easy to install and use.
KRT-4 provides user-friendly installation and operation:
•Convenient and easy to install in any TBUS.
•Intuitive Use –Pull and stop or pull and retract.
•Cable slowly retracts for safe use.
•Available Cable Types:
▪HDMI™.
▪VGA.
▪Audio (3.5mm).
▪LAN.
▪USB-3.0.
▪DisplayPort.
▪HDMI extender (KRT-4-3H2, see KRT-4-3H2 Features on page 4).
Refer to www.kramerav.com/product/KRT-4 for the updated configuration list.
•Maximum Cable Extension –Up to 1.8m (6ft).
•Horizontal Mount –Easily mounts, independently, under a table or shelf.
•TBUS Compatibility –Retractable cable mounts directly into the TBUS insert opening via
a cable pass-through opening.
•Installation –KRT-4 is sturdy, cost-effective, and easy to install.
The HDMI cable version is used throughout this manual as an example. The same applies to
retractors with other cable types.
Typical Applications
The KRT-4 is ideal for:
•Boardrooms and conference rooms.
•Training rooms.
•Hotel lobbies.
•Cafes and restaurants.

Kramer Electronics Ltd.
KRT-4 –Defining the KRT-4 Cable Retractor
3
Defining the KRT-4 Cable
Retractor
This section defines the KRT-4.
Figure 1: Defining the KRT-4 Cable Retractor
#
Feature
Function
Retractor Enclosure
Contains the retractable cable mechanism.
Female Connector
Connect to a male connector under a table.
Fixed Cable End
Short connector cable.
Screw Openings for Mounting Under the
Table (3)
Use to attach the KRT-4 directly under a table.
Wing-Head Thumb Screw
Use to turn and lock KRT-4 to the TBUS enclosure.
TBUS Installation Slot
Insert TBUS body into the slot to attach KRT-4 to a
TBUS.
Mobile Retractor Cable
Pull to connect to a connector above a table.
Retractor-Side Connector
Connect to a male connector.

Kramer Electronics Ltd.
KRT-4 –Defining the KRT-4 Cable Retractor
4
KRT-4-3H2 Features
The KRT-4-3H2 retractor side is a 4K HDR equalizer and line driver for HDMI and HDCP 2.2
signals that extends the range when using long HDMI cables.
Figure 2:KRT-4-3H2 –Extender Side
KRT-4-3H2 features:
•A range of 10m to input, 10m from output, total 20m (65ft) at 4K@60Hz (4:4:4); 25m to
input, 15m from output, total 40m (130ft) at 4K@60Hz (4:2:0); 30m to input, 15m from
output, total 45m (150ft) at 1080p60.
•HDTV compatibility.
•HDCP 2.2 support.
•HDMI Support –HDR10, ARC, CEC, deep color, x.v.Color™, Lip Sync, 7.1 PCM, Dolby
TrueHD, Dolby atmos DTS–HD, 2K, 4K, and 3D Dolby Vision as specified in HDMI 2.0.
•Optional external power supply via micro USB port (micro USB cable not included).
In some installations, external power may improve the overall KRT-3H2 performance.

Kramer Electronics Ltd.
KRT-4 –Installing KRT-4
5
Installing KRT-4
KRT-4 can be installed in the following ways:
•Attaching KRT-4 to the Underside of a Table, on page 5.
•Attaching KRT-4 to a TBUS, on page 6.
Attaching KRT-4 to the Underside of a Table
You can mount KRT-4 to the underside surface of a table and use it as a standalone device.
To attach KRT-4 under a table:
1. Place KRT-4 under the table in the desired location.
Make sure that the retracting cable faces the edge of the table.
2. Pass the 3 M4x50 Philips screws through the table screw openings and tighten them
to fix the retractor under the table.
Figure 3: Attaching KRT-4 to a Table

Kramer Electronics Ltd.
KRT-4 –Installing KRT-4
6
Attaching KRT-4 to a TBUS
You can attach one or more KRT-4 units to the enclosure of any modular Kramer TBUS with
pass-through inserts that are installed inside a table. The KRT-4 units can usually be attached
to the front and rear sides of the enclosure, as the left and right sides are fitted with clamps.
Alternatively, the clamps can be installed on the front and rear sides to enable attaching
KRT-4 to the left and right sides of the TBUS enclosure.
For TBUS models with a sliding lid (for example, TBUS-10xl), you can only use the front side
of the enclosure to mount the KRT-4 units.
Attaching a Single KRT-4 Unit
To Attach the KRT-4 to a TBUS unit:
1. Slide the KRT-4 onto one of the sides of the TBUS enclosure. Make sure to position the
fixed cable downwards and the retractor cable upwards.
Figure 4: Sliding KRT-4 onto the TBUS Enclosure

Kramer Electronics Ltd.
KRT-4 –Installing KRT-4
7
2. Use the wing-head thumb screw to fix the KRT-4 firmly in place.
Figure 5: Tightening KRT-4 to the TBUS Enclosure
3. Attach the WCP-(KRT) insert in the following way:
a. Insert the cable through the bushing opening.
b. Insert the cable with bushing through the insert opening.
c. Push the bushing into the insert opening.
a.
b.
c.
d. Use the two M3x5 screws to attach the insert to the TBUS opening.

Kramer Electronics Ltd.
KRT-4 –Installing KRT-4
8
The KRT-4 is now firmly fixed in place.
Figure 6: KRT-4 Attached to TBUS –Under Table

Kramer Electronics Ltd.
KRT-4 –Installing KRT-4
9
Attaching Several KRT-4 Units
You can attach several KRT-4 units to a Kramer TBUS:
•For TBUS units with a sliding cover (for example, the Kramer TBUS-10xl), attach the
KRT-4 units side-by-side to the front side of the TBUS enclosure (Figure 7):
Figure 7: Attaching Several KRT-4 Units to TBUS with Sliding Cover

Kramer Electronics Ltd.
KRT-4 –Installing KRT-4
10
•For TBUS units with a regular cover (for example, the Kramer TBUS-1Axl), attach the
KRT-4 units side-by-side to the front and rear side of the TBUS enclosure (Figure 8).
To maximize the number of KRT-4 units that can be attached to TBUS-1AXL,
TBUS-1-KWC or TBUS-1N, use an inner frame that does not include single or dual
power sockets or alternatively, install T-2INSERT/T-4INSERT in the single/dual
power socket opening.
Figure 8: Attaching Several KRT-4 Units to TBUS with Regular (Non-Retractable) Cover

Kramer Electronics Ltd.
KRT-4 –Connecting to the KRT-4
11
Connecting to the KRT-4
You can connect the following devices to the KRT-4.
Figure 9: Connecting KRT-4

Kramer Electronics Ltd.
KRT-4 –Technical Specifications
12
Technical Specifications
Ports
1 Female Connector (fixed cable end)
VGA, HDMI, Audio, LAN, USB-2.0,
USB-3.0, 3H2 or DisplayPort
1 Male Connector (retractor cable end)
Video
Max. Resolution (KRT-4-H, KRT-4-DP)
4K@60Hz (4:4:4)
Environmental
Conditions
Operating Temperature
0° to +40°C (32° to 104°F)
Storage Temperature
-40° to +70°C (-40° to 158°F)
Humidity
10% to 90%, RHL non-condensing
Regulatory Compliance
Safety
CE
Environmental
RoHs, WEEE
Enclosure
Type
Plastic (ABS PC)
Color
Black
Cable Length
Fixed Cable
20cm (7.9")
Retractable Cable
180cm (71")
General
Net Dimensions with Clamps
(W, D, H)
20.4cm x 3.6cm x 19.3cm
(8" x 1.4" x 7.6")
Shipping Dimensions
(W, D, H)
26.5cm x 34.5cm x 7.2cm
(10.4" x 13.6" x 2.8")
Net Weight
0.75kg (1.7lbs) approx.
Shipping Weight
1.3kg (2.9lbs) approx.
Accessories
Included
3 M4x50 screws, WCP-(KRT) insert
kit.
Specifications are subject to change without notice at www.kramerav.com
KRT-4-3H2 Extender Additional Specifications
Port
Micro USB
5V, 150mA (external power source, optional)
Control
Power LED
Lights red when extender is powered
Video
Maximum Range
4K@60Hz (4:4:4) –10m (33ft) from extender to display
4K@60Hz (4:2:0) / 4K@30 –15m (49ft) from extender to display
1080p@60Hz –15m (49ft) from extender to display
Maximum Resolution
4K@60Hz (4:4:4)
Compliance
Up to HDCP 2.2
Specifications are subject to change without notice. For the most updated resolution list, go to our Web site at www.kramerav.com

Kramer Electronics Ltd.
KRT-4 –Technical Specifications
13
KRT-4 Outline Dimensions with TBUS
The following diagram shows the outline dimensions [cm] of a KRT-4 unit attached to a TBUS
(for example, the Kramer TBUS-1Axl).
Figure 10: KRT-4 Attached to TBUS –Dimensions

The warranty obligations of Kramer Electronics Inc. (“Kramer Electronics”) for this product are limited to the terms set forth below:
What is Covered
This limited warranty covers defects in materials and workmanship in this product.
What is Not Covered
This limited warranty does not cover any damage, deterioration or malfunction resulting from any alteration, modification, improper or unreasonable use
or maintenance, misuse, abuse, accident, neglect, exposure to excess moisture, fire, improper packing and shipping (such claims must be presented to
the carrier), lightning, power surges, or other acts of nature. This limited warranty does not cover any damage, deterioration or malfunction resulting
from the installation or removal of this product from any installation, any unauthorized tampering with this product, any repairs attempted by anyone
unauthorized by Kramer Electronics to make such repairs, or any other cause which does not relate directly to a defect in materials and/or workmanship
of this product. This limited warranty does not cover cartons, equipment enclosures, cables or accessories used in conjunction with this product.
Without limiting any other exclusion herein, Kramer Electronics does not warrant that the product covered hereby, including, without limitation, the
technology and/or integrated circuit(s) included in the product, will not become obsolete or that such items are or will remain compatible with any other
product or technology with which the product may be used.
How Long this Coverage Lasts
The standard limited warranty for Kramer products is seven (7) years from the date of original purchase, with the following exceptions:
1. All Kramer VIA hardware products are covered by a standard three (3) year warranty for the VIA hardware and a standard three (3) year
warranty for firmware and software updates; all Kramer VIA accessories, adapters, tags, and dongles are covered by a standard one (1) year
warranty.
2. Kramer fiber optic cables, adapter-size fiber optic extenders, pluggable optical modules, active cables, cable retractors, ring mounted
adapters, portable power chargers, Kramer speakers, and Kramer touch panels are all covered by a standard one (1) year warranty.
3. All Kramer Cobra products, all Kramer Calibre products, all Kramer Minicom digital signage products, all HighSecLabs products, all
streaming, and all wireless products are covered by a standard three (3) year warranty.
4. All Sierra Video MultiViewers are covered by a standard five (5) year warranty.
5. Sierra switchers & control panels are covered by a standard seven (7) year warranty (excluding power supplies and fans that are covered for
three (3) years).
6. K-Touch software is covered by a standard one (1) year warranty for software updates.
7. All Kramer passive cables are covered by a ten (10) year warranty.
Who is Covered
Only the original purchaser of this product is covered under this limited warranty. This limited warranty is not transferable to subsequent purchasers or
owners of this product.
What Kramer Electronics Will Do
Kramer Electronics will, at its sole option, provide one of the following three remedies to whatever extent it shall deem necessary to satisfy a proper
claim under this limited warranty:
1. Elect to repair or facilitate the repair of any defective parts within a reasonable period of time, free of any charge for the necessary parts and
labor to complete the repair and restore this product to its proper operating condition. Kramer Electronics will also pay the shipping costs
necessary to return this product once the repair is complete.
2. Replace this product with a direct replacement or with a similar product deemed by Kramer Electronics to perform substantially the same
function as the original product. If a direct or similar replacement product is supplied, the original product’s end warranty date remains
unchanged and is transferred to the replacement product.
3. Issue a refund of the original purchase price less depreciation to be determined based on the age of the product at the time remedy is sought
under this limited warranty.
What Kramer Electronics Will Not Do Under This Limited Warranty
If this product is returned to Kramer Electronics or the authorized dealer from which it was purchased or any other party authorized to repair Kramer
Electronics products, this product must be insured during shipment, with the insurance and shipping charges prepaid by you. If this product is returned
uninsured, you assume all risks of loss or damage during shipment. Kramer Electronics will not be responsible for any costs related to the removal or re-
installation of this product from or into any installation. Kramer Electronics will not be responsible for any costs related to any setting up this product, any
adjustment of user controls or any programming required for a specific installation of this product.
How to Obtain a Remedy Under This Limited Warranty
To obtain a remedy under this limited warranty, you must contact either the authorized Kramer Electronics reseller from whom you purchased this
product or the Kramer Electronics office nearest you. For a list of authorized Kramer Electronics resellers and/or Kramer Electronics authorized service
providers, visit our web site at www.kramerav.com or contact the Kramer Electronics office nearest you.
In order to pursue any remedy under this limited warranty, you must possess an original, dated receipt as proof of purchase from an authorized Kramer
Electronics reseller. If this product is returned under this limited warranty, a return authorization number, obtained from Kramer Electronics, will be
required (RMA number). You may also be directed to an authorized reseller or a person authorized by Kramer Electronics to repair the product.
If it is decided that this product should be returned directly to Kramer Electronics, this product should be properly packed, preferably in the original
carton, for shipping. Cartons not bearing a return authorization number will be refused.
Limitation of Liability
THE MAXIMUM LIABILITY OF KRAMER ELECTRONICS UNDER THIS LIMITED WARRANTY SHALL NOT EXCEED THE ACTUAL PURCHASE
PRICE PAID FOR THE PRODUCT. TO THE MAXIMUM EXTENT PERMITTED BY LAW, KRAMER ELECTRONICS IS NOT RESPONSIBLE FOR
DIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM ANY BREACH OF WARRANTY OR CONDITION, OR
UNDER ANY OTHER LEGAL THEORY. Some countries, districts or states do not allow the exclusion or limitation of relief, special, incidental,
consequential or indirect damages, or the limitation of liability to specified amounts, so the above limitations or exclusions may not apply to you.
Exclusive Remedy
TO THE MAXIMUM EXTENT PERMITTED BY LAW, THIS LIMITED WARRANTY AND THE REMEDIES SET FORTH ABOVE ARE EXCLUSIVE AND
IN LIEU OF ALL OTHER WARRANTIES, REMEDIES AND CONDITIONS, WHETHER ORAL OR WRITTEN, EXPRESS OR IMPLIED. TO THE
MAXIMUM EXTENT PERMITTED BY LAW, KRAMER ELECTRONICS SPECIFICALLY DISCLAIMS ANY AND ALL IMPLIED WARRANTIES,
INCLUDING, WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IF KRAMER
ELECTRONICS CANNOT LAWFULLY DISCLAIM OR EXCLUDE IMPLIED WARRANTIES UNDER APPLICABLE LAW, THEN ALL IMPLIED
WARRANTIES COVERING THIS PRODUCT, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE,
SHALL APPLY TO THIS PRODUCT AS PROVIDED UNDER APPLICABLE LAW.
IF ANY PRODUCT TO WHICH THIS LIMITED WARRANTY APPLIES IS A “CONSUMER PRODUCT” UNDER THE MAGNUSON-MOSS WARRANTY
ACT (15 U.S.C.A. §2301, ET SEQ.) OR OTHER APPLICABLE LAW, THE FOREGOING DISCLAIMER OF IMPLIED WARRANTIES SHALL NOT
APPLY TO YOU, AND ALL IMPLIED WARRANTIES ON THIS PRODUCT, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
THE PARTICULAR PURPOSE, SHALL APPLY AS PROVIDED UNDER APPLICABLE LAW.
Other Conditions
This limited warranty gives you specific legal rights, and you may have other rights which vary from country to country or state to state.
This limited warranty is void if (i) the label bearing the serial number of this product has been removed or defaced, (ii) the product is not distributed by
Kramer Electronics or (iii) this product is not purchased from an authorized Kramer Electronics reseller. If you are unsure whether a reseller is an
authorized Kramer Electronics reseller, visit our web site at www.kramerav.com or contact a Kramer Electronics office from the list at the end of this
document.
Your rights under this limited warranty are not diminished if you do not complete and return the product registration form or complete and submit the
online product registration form. Kramer Electronics thanks you for purchasing a Kramer Electronics product. We hope it will give you years of
satisfaction.

www.KramerAV.com
[e-mail]
P/N:
2900-301295
Rev:
5
SAFETY WARNING
Disconnect the unit from the power supply before opening andservicing
For the latest information on our products and a list of Kramer distributors, visit our Web site where
updates to this user manual may be found.
We welcome your questions, comments, and feedback.
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