Faq; Transmission Distance Is Not Ideal - Ebyte E31-433T17D1B User Manual

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Please check the power supply to ensure that it's within the recommended power supply, or the module will be
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permanently damaged if it exceeds the maximum value.
Please check the stability of the power supply, and the voltage cannot be fluctuated frequently;
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When designing the power supply circuit for the module, it is often recommended to reserve more than 30% of the
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margin, which is beneficial for long-term stable operation of the whole machine
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 the module, it is assumed that the module is soldered to the Top Layer, and the
copper is applied to the Top Layer of the module contact part(Copper is well grounded), and must be close to the
digital part of the module and routed in the Bottom Layer;
Assuming that the module is soldered or placed in the Top Layer, it is also wrong to randomly route the Bottom
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Layer or other layers, which will affect the spurs and receiving sensitivity of the module in varying degrees;
Assume that there are devices with large electromagnetic interference around the module that will greatly affect the
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performance of the module. It is recommended to keep 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 around the module (high-frequency digital,
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high-frequency analog, power trace), which 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 possible, users can do some proper
isolation and shielding;
If the communication line uses 5V level, it must be connected in series with 1k-5.1k resistor (not recommended,
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there is still risk of damage);
Try to stay away from some physical layers which is 2.4GHz TTL protocol, for example: USB3.0;
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The antenna installation structure has a great influence on the performance of the module. Make sure that the
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antenna is exposed, preferably vertically. When the module is installed inside the casing, a good antenna extension
cable can be used to extend the antenna to the outside of the casing;
The antenna can not be installed inside the metal case, which will greatly reduce the transmission distance.
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9 FAQ

9.1 Transmission distance is not ideal

When there is a linear communication obstacle, the communication distance will be correspondingly reduced;
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Temperature, humidity, and co-channel interference will lead to an increase in communication packet loss rate;
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The ground absorbs and reflects radio waves, so the test results close to the ground are poor.
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Seawater has a strong ability to absorb radio waves, so the seaside test results are poor.
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There are metal objects near the antenna, or placed in the metal shell, the signal attenuation will be very serious;
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Power register setting error, air data rate setting is too high (the higher the air data rate, the closer the distance);
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The low voltage of the power supply is lower than the recommended value at room temperature, and the lower the
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voltage, the smaller the power;
The matching degree of antenna and module is poor, or the quality of the antenna itself.
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E31-433T17D1B User Manual
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