Chengdu Ebyte Electronic Technology Co.,Ltd.
E49-900M20S user manual
Copyright ©2012–2021
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Chengdu Ebyte Electronic Technology Co.,Ltd.
8
6 FAQ
6.1 Communication range is too short
The communication distance will be affected when obstacle exists;
Data lose rate will be affected by temperature, humidity and co-channel interference;
The ground will absorb and reflect wireless radio wave, so the performance will be poor when testing near ground;
Sea water has great ability in absorbing wireless radio wave, so performance will be poor when testing near the sea;
The signal will be affected when the antenna is near metal object or put in a metal case;
Power register was set incorrectly, air data rate is set as too high (the higher the air data rate, the shorter the
distance);
The power supply low voltage under room temperature is lower than 2.5V, the lower the voltage, the lower the
transmitting power;
Due to antenna quality or poor matching between antenna and module.
6.2 Module is easy to damage
Please check the power supply source, ensure it is between recommends, voltage higher than the maximum will
damage the module;
Please check the stability of power source, the voltage cannot fluctuate too much;
Please make sure anti-static measure are taken when installing and using, high frequency devices have electrostatic
susceptibility;
Please ensure the humidity is within limited range, some parts are sensitive to humidity;
Please avoid using modules under too high or too low temperature.
6.3 BER(Bit Error Rate) is high
There are co-channel signal interference nearby, please be away from interference sources or modify
frequency and channel to avoid interference;
SPI clock waveform is not standard, check whether there is interference on the SPI line, SPI bus wiring should not
be too long;
Poor power supply may cause messy code. Make sure that the power supply is reliable;
The extension line and feeder quality are poor or too long, so the bit error rate is high.
