Faq; Communication Range Is Too Short - Ebyte E104-BT51 User Manual

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Please pay attention to the correct connection of the positive and negative poles of the power supply. Reverse
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connection may cause permanent damage to the module;
Please check the power supply to ensure it is within the recommended voltage otherwise when it exceeds the
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maximum value the module will be permanently damaged;
Please check the stability of the power supply, the voltage can not be fluctuated frequently;
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When designing current supply circuit, 30% margin is recommended to be remained so as to ensure long-term
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stable operation of the whole module;
The module should be as far away as possible from the power supply, transformers, high-frequency wiring and other
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parts with large electromagnetic interference;
High-frequency digital routing, high-frequency analog routing, and power routing must be avoided under the
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module. If it is necessary to pass through the module, assume that the module is soldered to the Top Layer, and the
copper is spread on the Top Layer of the module contact part(well grounded), it must be close to the digital part of
the module and routed in the Bottom Layer;
Assuming the module is soldered or placed over the Top Layer, it is wrong to randomly route over the Bottom Layer
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or other layers, which will affect the module's spurs and receiving sensitivity to varying degrees;
It is assumed that there are devices with large electromagnetic interference around the module that will greatly

affect the performance. It is recommended to keep them away from the module according to the strength of the
interference. If necessary, appropriate isolation and shielding can be done;
Assume that there are traces with large electromagnetic interference (high-frequency digital, high-frequency analog,
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power traces) around the module that will greatly affect the performance of the module. It is recommended to stay
away from the module according to the strength of the interference. If necessary, appropriate isolation and shielding
can be done;
If the communication line uses level, 1k-5.1k resistor must be connected in series(not recommended, there is a risk
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of damage)
Try to stay from some physical layers such as TTL protocol at 2.4GHz , for example: USB3.0;
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The antenna installation structure has a great impact on the performance of the module. Be sure to keep the antenna
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exposed, preferably vertically. When the module is installed inside the case, a high-quality antenna extension cable
can be used to extend the antenna to the outside of the case;
The module must not be installed inside metal shield, which will greatly reduce the transmission distance.
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10. FAQ

10.1 Communication range is too short

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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Seawater 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
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distance).
When the power supply at room temperature is lower than the recommended low voltage, the lower the voltage is,
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E104-BT51 User Manual