Ebyte E22-400T30S User Manual page 21

Chengdu Ebyte Electronic Technology Co., Ltd.
the whole machine is conducive to long-term stable work;
The module should be kept as far away as possible from parts with high electromagnetic interference such as power supply,
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transformer, and high-frequency wiring;
High-frequency digital traces, high-frequency analog traces, and power traces must avoid the bottom of the module. If it is really
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necessary to pass through the bottom of the module, assuming that the module is soldered to the Top Layer, lay copper on the top
layer of the contact part of the module (all copper And good grounding), must be close to the digital part of the module and
routed in the Bottom Layer;
Assuming that the module is soldered or placed on the Top Layer, it is also wrong to randomly route the wires on the Bottom
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Layer or other layers, which will affect the stray and receiving sensitivity of the module to varying degrees;
It is assumed that there are devices with large electromagnetic interference around the module that will greatly affect the
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performance of the module. According to the intensity of the interference, it is recommended to keep away from the module. If
the situation permits, proper isolation and shielding can be done;
It is assumed that there are traces with large electromagnetic interference (high-frequency digital, high-frequency analog, power
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traces) around the module, which will also greatly affect the performance of the module. According to the intensity of the
interference, it is recommended to keep away from the module. If the situation permits, it can be done Appropriate isolation and
shielding;
If the communication line uses a 5V level, a 1k-5.1k resistor must be connected in series (not recommended, there is still a risk
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of damage);
Try to stay away from some TTL protocols whose physical layer is also 2.4GHz, for example: USB3.0;
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The antenna installation structure has a great impact on the performance of the module. Make sure that the antenna is exposed
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and it is best to vertically upward;
When the module is installed inside the casing, a high-quality antenna extension cable can be used to extend the antenna to the
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outside of the casing;
The antenna must not be installed inside the metal shell, which will greatly weaken the transmission distance.
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E22-400T30S_User Manual _EN