Users Manual

RSBRS02ABR
www.szrfstar.comV1.0 - Jan., 2020
antenna is a key factor to increase the data rate and transmission range.
Therefore,the layout of the module antenna location and routing is recommended as follows:
（1） Place the antenna on the edge(corner) of the PCB.
（2） Make sure that there is no signal line or copper foil in each layer below the antenna.
（3） It is the best to hollow out the antenna position in the following figure so as to ensure that S11 of the module is
minimally affected.
Figure 7. Recommendation of Antenna Layout
Note: The hollow-out position is based on the antenna used.
4.5 Trouble Shooting
4.5.1 Unsatisfactory Transmission Distance
1. When there is a linear communication obstacle, the communication distance will be correspondingly
weakened.Temperature, humidity, and co-channel interference will lead to an increase in communication packet
loss rate.The performances of ground absorption andreflectionof radio waves will be poor, when the module is
tested close to the ground.
2. Seawater has a strong ability to absorb radio waves, so the test results by seaside are poor.
3. The signal attenuation will be very obvious, if there is a metal near the antenna or themodule is placed inside of the
metal shell.
4. The incorrect power register set or the high data ratein an open air may shorten the communication distance.The
higher the data rate, the closer the distance.
5. The low voltage of the power supply is lower than the recommended value at ambient temperature, and the lower
the voltage, the smaller the power is.
6. The unmatchable antennas and module or the poor quality of antenna will affect the communication distance.
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