CDX Phone Transceiver
2026
User Manual
Version: 1.1
Publish date: 25/03/2026
CDX TECHNOLOGY EUROPE B.V. - CDX Phone Transceiver 1
Copyright
Information in this document is subject to change without notice. Trademarks, trade names, service marks or
service names owned or registered by any other company and used in this document are property of the
respective companies.
Disclaimer
Information contained in this document is confidential, privileged and only for the information of the intended
recipient and may not be used, published, or redistributed without the prior written consent of CDX Technology
Europe B.V.
Safety
This product is designed to assist in improving safety on a go-karting track. While it may help reduce certain risks
when used correctly, it does not eliminate hazards associated with go-karting activities and cannot replace
proper track safe operating procedures, trained personnel, or compliance with applicable safety regulations.
While every effort has been made to ensure the accuracy of the information contained in this manual, the
manufacturer cannot be held responsible for errors, omissions, or inaccuracies in this publication.
Copyright © 2026 CDX Technology Europe B.V.
FCC ID: 2BUQO-CDX-PHTR2514
Contact details
Address:
Meander 551
6825 MD Arnhem
The Netherlands
General inquiries:
https://www.cdx-technology.com
Main office:
+31 85 2006 480
Technical support:
+31 6 1417 0924
Technical support email:
support@cdx-technology.com
CDX TECHNOLOGY EUROPE B.V. - CDX Phone Transceiver 2
FCC statement
Product name: CDX Phone Transceiver
Responsible party: CDX Technology Europe B.V.
Address: Meander 551, 6825 MD Arnhem, the Netherlands
Website: https://www.cdx-technology.com
Tel: +31 85 2006 480
E-mail: support@cdx-technology.com
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may cause undesired
operation. Any Changes or modifications not expressly approved by the party responsible for compliance
could void the user's authority to operate the equipment.
Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to
part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference
when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate
radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause
harmful interference in which case the user will be required to correct the interference at his own expense.
CDX TECHNOLOGY EUROPE B.V. - CDX Phone Transceiver 3
DOCUMENT REVISIONS
Version
Details
Date
Author
0.1
Init user manual.
11-12-2025
TF
0.2
Updates to document.
16-12-2025
TF/WH
0.3
Added document.
17-12-2025
KKS
0.4
Added document.
18-12-2025
JFL/KKS
0.5
Updates to document.
12-01-2026
HV/CM
0.6
Minor improvements.
14-01-2026
WH
1.0
First version release.
15-01-2026
JFL/KKS
1.1
Processed feedback
Applus.
25-03-2026
KKS
CDX TECHNOLOGY EUROPE B.V. - CDX Phone Transceiver 4
TABLE OF CONTENTS
1 INTRODUCTION ................................................................................................................................. 5
1.1 Package contents ...................................................................................................................................................... 5
1.2 Compatible expansion components .......................................................................................................................... 5
1.3 Overview of product features .................................................................................................................................... 6
2 OPERATING INSTRUCTIONS ................................................................................................................ 7
2.1 CDX Phone Transceiver User Interface ...................................................................................................................... 7
2.2 Group speed control .................................................................................................................................................. 7
2.3 Individual speed control ............................................................................................................................................ 7
2.4 Synchronization between Remote controls ............................................................................................................... 8
2.5 Charging .................................................................................................................................................................... 8
3 SYSTEM CONFIGURATION .................................................................................................................. 9
3.1 Speed restriction ....................................................................................................................................................... 9
3.2 4 speed or 8 speed mode........................................................................................................................................... 9
3.3 Track ID and Track PIN ............................................................................................................................................... 9
3.4 Region ....................................................................................................................................................................... 9
4 TECHNICAL DATA ............................................................................................................................. 10
5 REFERENCES .................................................................................................................................... 11
CDX TECHNOLOGY EUROPE B.V. - CDX Phone Transceiver 5
1 Introduction
The CDX Phone Transceiver is a device used to transmit speed commands to the CDX EV controller. See Chapter 4
(Technical data) for frequency and antenna details. The CDX Phone Transceiver is integrated into the protective
phone case used with the mobile device. The Phone Transceiver is specially designed to support a handheld
mobile device and is intended for operation by track marshals moving along the go-karting track. This product is
intended as supplementary control device and does not replace established track procedures and supervision.
1.1 Package contents
The following items are supplied with the CDX Phone Transceiver.
- CDX Phone Transceiver - Charger cable - Charger adapter
1.2 Compatible expansion components
- CDX EV Controller
o The CDX Phone Transceiver controls the CDX EV Controller to limit the speed on a go-kart.
- CDX Tablet Transceiver
o The CDX Phone Transceiver can control the CDX EV Controllers together with CDX Tablet
Transceivers. Speed settings are automatically synchronized between the CDX Phone Transceiver
and the CDX Tablet Transceiver such that both are able to control and show the speeds of CDX EV
Controllers.
- Lanyard
o The CDX Phone Transceiver is provided with a lanyard attachment point on the underside of the
device. A lanyard may be attached to support hands-free handling during operation. The use of a
lanyard is recommended to assist with device handling when the operator needs to perform
additional tasks, such as track signaling.
Figure 1: USB charger cable
Figure 2: Charger adapter
Figure 3: CDX Phone Transceiver
CDX TECHNOLOGY EUROPE B.V. - CDX Phone Transceiver 6
1.3 Overview of product features
NUMBER
DESCRIPTION
1.
Antenna location
2.
On/Off button
3.
USB-C charging connector
4.
Lanyard attachment point
5.
Region
6.
Serial Number
Figure 5: Front side of CDX Phone Transceiver
with important parts highlighted
Figure 4: Back side of CDX Phone Transceiver
with important parts highlighted
4
2
3
1
5
6
CDX TECHNOLOGY EUROPE B.V. - CDX Phone Transceiver 7
2 Operating instructions
The CDX Phone Transceiver is used to send speed commands to the CDX EV Controller. Track marshals positioned
alongside the go-karting track monitor on-track activity and overall safety. If necessary, they can remotely adjust
the speed of individual go-karts or bring them to a complete stop by transmitting speed commands via the CDX
Phone Transceiver.
2.1 CDX Phone Transceiver User Interface
2.2 Group speed control
Group speed control is used to activate a speed setting for all go-karts, within the range of the CDX Phone
Transceiver. The group speed control buttons are shown in Figure 6, and highlighted with number 1.
2.3 Individual speed control
Individual speed control is used to apply a speed setting for a specific go-kart. The individual speed control
buttons are shown in Figure 6, and highlighted with the number 2.
For example, if all go-karts are set to speed 4, but kart 22 is individually set to speed 3, the remaining go-karts will
continue to run at speed 4.
NUMBER
DESCRIPTION
1.
Group go-kart speed control
2.
Individual go-kart speed control
3.
STOP button
Figure 6: CDX Phone Transceiver Interface
1
2
3
6
CDX TECHNOLOGY EUROPE B.V. - CDX Phone Transceiver 8
2.4 Synchronization between Remote controls
All CDX Control interfaces (Tablet and Handheld) support synchronization functionality. When synchronization is
active, the current speed setting of the assigned group is displayed on each control interface. The displayed speed
setting can be found in the upper-left corner of the screen, next to the CDX Technology logo, referred to as S1 up
to S4 (or S8 if the 8 speed settings are used).
2.5 Charging
Charging starts when the charger is plugged into the USB-C connector on the bottom side of the CDX Phone
Transceiver, which is shown with the number 3 in Figure 5. The CDX Phone Transceiver must be powered on to
allow the charging process to initiate. To support normal operation, it is recommended to avoid allowing the
battery level to drop below approximately 20%. If the battery level is too low to allow charging while installed in
the casing, the phone must be removed from the casing and charged separately.
Charging should only take place using the supplied charger and the supplied USB-C cable.
CDX TECHNOLOGY EUROPE B.V. - CDX Phone Transceiver 9
3 System Configuration
The CDX Phone Transceiver has various features that can be configured. This includes 4 or 8 speed mode, Track ID
and Track PIN.
3.1 Speed restriction
The main function of the CDX Phone Transceiver is to limit the speed of go-karts using the CDX EV Controller. This
is done using the group speed control buttons that are shown in Figure 6, and highlighted with the number 1.
3.2 4 speed or 8 speed mode
When the motor speed controller on the go-kart uses 4 separate speed presets and a stop command, the CDX
Phone Transceiver should be used in 4 speed mode. This is the default configuration of the CDX Phone
Transceiver. Optionally, for normal use speed 1-4 and STOP can be sent to the CDX EV controller. An optional 5-8
speed is available for go-karts that have a different motor controller. See the corresponding ReferencesCDX
Technology Europe B.V. (2026). CDX_Remote_App_User_Manual. for further information.
3.3 Track ID and Track PIN
The Track ID and Track PIN feature allows the segmentation of a group of CDX EV controllers. By default the
Track-ID is set to ‘0000’ and Track-PIN is set to ‘0000’. In this mode the CDX EV controller accepts speeds
commands from CDX Tablet Transceivers remotes regardless of track id and track pin settings of the CDX Tablet
Transceiver. This is done to enhance the safety where someone cannot accidentally block their communication
ability.
A Track ID and Track PIN can be used when individual control of two or more groups of go-karts is required. The
Track ID and Track PIN are configured in the settings of the CDX Tablet Transceiver and must correspond to the
settings in the CDX EV Controller.
This function can also be used to prevent misuse of the system by changing these 2 parameters. Preventing
dangerous situations caused by people with malicious intent.
3.4 Region
Every CDX Phone Transceiver is preconfigured to work with the radio frequencies that are permitted in the
specific region where it is bought. The region code is shown on the label of the CDX Phone Transceiver, shown in
Figure 4, highlighted with the number 5.
It should be noted that the CDX Phone Transceiver only works with other CDX devices configured to the same
region (frequency). Additionally, Transceivers are intended for use only in the region for which they are
configured.
CDX TECHNOLOGY EUROPE B.V. - CDX Phone Transceiver 10
4 Technical data
This chapter presents the technical data in tables by category.
Electrical characteristic
Min
Typ.
Max
Unit
Charging input voltage
5
5.2
V (DC)
Charging input current
2.5
A
Environmental characteristic
Min
Typ.
Max
Unit
Operational temperature
1
0
45
°C
Storage temperature
-20
60
°C
Radio characteristic
Unit
Transmission radio frequency
869 (Europe),
908 (North America)
MHz
Transmission power
16 (Europe),
251 (North America)
mW
Radio modulation
Direct sequence
spread spectrum
(DSSS)
Radio antenna
PCB antenna
Radio antenna gain
4.85
dBi
Physical characteristic
Unit
Dimensions (Width × Length × Height)
212 x 83 x 20
mm
Housing material
TPU
1
Upon request, wider temperature ranges are available.
CDX TECHNOLOGY EUROPE B.V. - CDX Phone Transceiver 11
5 References
1. CDX Technology Europe B.V. (2026). CDX_Remote_App_User_Manual.
