Ebyte E49-400T20D, User Manual

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Chengdu Ebyte Electronic Technology Co.,Ltd. E49-400T20D User Manual
Copyright ©2012–2019
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Chengdu Ebyte Electronic Technology Co.,Ltd. 17
9. FAQ
9.1 Communication range is too short
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The communication distance will be affected when obstacle exists.
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Data lose rate will be affected by temperature, humidity and co-channel interference.
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The ground will absorb and reflect wireless radio wave, so the performance will be poor when testing near ground.
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Sea water has great ability in absorbing wireless radio wave, so performance will be poor when testing near the sea.
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The signal will be affected when the antenna is near metal object or put in a metal case.
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Power register was set incorrectly, air data rate is set as too high (the higher the air data rate, the shorter the
distance).
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The power supply low voltage under room temperature is lower than 2.5V, the lower the voltage, the lower the
transmitting power.
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Due to antenna quality or poor matching between antenna and module.
9.2 Module is easy to damage
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Please check the power supply to ensure that it is between the recommended power supply voltage. If the maximum
value is exceeded, the module will be permanently damaged.

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.
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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.
9.3 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;
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Poor power supply may cause messy code. Make sure that the power supply is reliable.
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The extension line and feeder quality are poor or too long, so the bit error rate is high;