Precautions For Use - Ebyte E90-DTU Manual

Chengdu Ebyte Electronic Technology Co.,Ltd.
XIV

Precautions for use

 Please keep the warranty card of this equipment, the warranty card has the factory number of the equipment
(and important technical parameters), which is an important reference value for the user's future maintenance
and new equipment.

radio in the warranty period, if due to the quality of the product itself and not man-made damage or damage
caused by lightning and other natural disasters, enjoy free warranty; please do not repair the user, the
problem is to get in touch with EBYTE to provide first-class after-sales service.

The radio should not be operated in the vicinity of flammable places (e.g. coal mines) or explosive objects
(e.g. detonators).

A suitable DC voltage regulator should be used, which is required to have strong resistance to high-frequency
interference, small ripple, and sufficient load capacity; it is also preferable to have the functions of
over-current, over-voltage protection and lightning protection to ensure the normal operation of the digital
radio.
 Do not use the digital radio beyond the environmental characteristics of the working environment, such as
high temperature, humidity, low temperature, strong electromagnetic fields or dusty environment.
 Do not allow the digital radio to continuously transmit at full load, as this may burn out the transmitter.
 The ground wire of the digital radio should be well connected with the ground wire of external devices (such
as PC, PLC, etc.) and the ground wire of the power supply, or it may easily burn out the communication interface,
etc.; do not plug or unplug the serial port with electricity.
 When testing the digital radio, it must be connected with matching antenna or 50Ω dummy load, otherwise
it is easy to damage the transmitter; if the antenna is connected, it is better for the human body to be
more than 2 meters away from the antenna to avoid injury, and never touch the antenna when transmitting;
when the suction cup antenna is used, the suction cup must be adsorbed on the metal surface.

Wireless digital transmission radios often have different communication distances in different environments,
and the communication distance is often affected by temperature, humidity, obstacle density, obstacle volume
and electromagnetic environment; in order to ensure stable communication, it is recommended to reserve more
than 50% of the communication distance.

If the measured communication distance is unsatisfactory, it is recommended to analyze the improvement of
communication distance starting from the antenna quality and antenna installation method. Can contact
support@cdebyte.com
 When selecting the power supply, in addition to the need to reserve 50% of the current margin as recommended,
it should be noted that its ripple should not exceed 100mV.
 Wireless communication products need to be connected to the antenna with matching impedance to work normally,
even the short time test should not be omitted, if the product damage caused by this reason will not be covered
by the warranty.
Copyright ©2012–2023， Chengdu Ebyte Electronic Technology Co.,Ltd.
for help.
E90-DTU(xxxSL42) User Manual
25