Ebyte E78-400M22S, User Manual

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Chengdu Ebyte Electronic Technology Co.,Ltd E78-400M22S user manual
Copyright ©2012–2019
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Chengdu Ebyte Electronic Technology Co,;Ltd
7
is still risk of damage);
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As far as possible away from some physical layer also 2.4GHz TTL protocol, such as: USB3.0;

Antenna installation structure has a great impact on the performance of the module, it must be ensured that the
antenna is exposed and preferably vertical;

When the module is installed inside the housing, a high-quality antenna extension cord can be used to extend the
antenna to the outside of the housing.

The antenna must not be installed in the inner part of the metal shell, which will greatly weaken the transmission
distance.
7.FAQ
7.1 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.

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.

Due to antenna quality or poor matching between antenna and module.
7.2 Module is easy to damage
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Please check the power supply source, ensure it is 2.0V~3.6V, voltage higher than 3.6V will damage the module.
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Please check the stability of power source, the voltage cannot fluctuate too much.

Please make sure antistatic 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.
7.3 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;

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;