Ebyte E22-900MM22S, Product Specifications

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Chengdu Ebyte Electronic Technology Co.,Ltd E22-900M22S User manual
Copyright ©2012–2018
，Chengdu Ebyte Electronic Technology Co.,Ltd
7
Chapter 6 FAQ
6.1 Transmission distance is not ideal
 When there is a straight-line communication obstacle, the communication distance will decay accordingly.

Temperature, humidity, and co-frequency interference increase the communication packet loss rate.
 The ground absorbs and reflects radio waves, which is poor near the ground.
 Sea water is extremely capable of absorbing radio waves, making seaside tests less effective.

Antenna near a metal object, or placed in a metal shell, the signal attenuation can be severe;
 The power register is incorrectly set, or the air rate is set too high (the higher the air rate, the closer
the distance);
 The low voltage of the power supply is lower than the recommended value at room temperature, and the lower
the voltage, the lower the power generation.

The matching degree between the antenna and the module is poor or the quality of the antenna itself is faulty.
6.2 Modules are easily damaged
 Check the power supply to make sure it's between recommended supply voltages, as exceeding the maximum value
can permanently damage the module.

Check the stability of the power supply, the voltage shouldn't fluctuate wildly or frequently.
 Ensure that high-frequency devices are electrostatic sensitive during installation and use using
anti-static operations.
 Ensure that the humidity is not too high during installation and use, as some components are humidity
sensitive.

Do not use the device at too high or too low temperature if there are no special requirements.
6.3 Bit error rate is too high

Stay away from the interference source, or change the frequency and channel to avoid interference.

The clock waveform on the SPI is non-standard. Check whether there is interference on the SPI line, and
the SPI bus should not be too long.

A poor power supply can cause garbled , so ensure the reliability of the power supply.

Poor quality or too long extension wires or feeders will also cause high BER.