Chapter 6 Faq; Transmission Distance Is Not Ideal; Modules Are Easily Damaged; Chapter 7 Welding Operation Guidance - Ebyte E21-400G37S User Manual

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Chapter 6 FAQ

6.1 Transmission distance is not ideal

When there is a linear communication obstacle, the communication distance will decay accordingly;

Temperature, humidity and co frequency interference will lead to higher communication packet loss rate;

The ground absorbs and reflects radio waves, and the test effect near the ground is poor;

The sea water has a strong ability to absorb radio waves, so the seaside test effect is poor;

If there are metal objects near the antenna or placed in the metal shell, the signal attenuation will be very serious;

The power register is set incorrectly, and the air rate is set too high (the higher the air rate, the closer the distance);

The low voltage of the power supply is lower than the recommended value at room temperature, and the lower the

voltage, the smaller the power generation;
 The matching degree between the antenna and the module is poor or the quality of the antenna itself is poor.

6. 2 Modules are easily damaged

Please check the power supply to ensure that it is between the recommended power supply voltages. If it exceeds the

maximum value, the module will be permanently damaged;
Please check the stability of the power supply, and the voltage cannot fluctuate significantly and frequently;

Please ensure anti-static operation during installation and use, and electrostatic sensitivity of high-frequency devices;

Please ensure that the humidity during installation and use is not too high, and some components are humidity

sensitive devices;
If there is no special demand, it is not recommended to use it at too high or too low temperature.


Chapter 7 Welding Operation Guidance

7.1 Reflow soldering temperature

Profile Feature
Solder Paste
Preheat Temperature min （Tsmin）
Preheat temperature max (Tsmax)
Preheat Time (Tsmin to Tsmax)(ts)
Average ramp-up rate(Tsmax to Tp)
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Curve characteristics
Solder paste
Minimum preheating
temperature
Maximum preheating
temperature
Warm up time
Average rate of rise
E21-400G37 User Manual
Sn-Pb Assembly
Sn63/Pb37
100℃
150℃
60-120 sec
3℃/second max
Pb-Free Assembly
Sn96.5/Ag3/Cu0.5
150℃
200℃
60-120 sec
3℃/second max
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