A 4-layer PCB with a solid ground plane and a separate power plane is recommended. Keep the RF traces as short as possible and use a 50-ohm impedance-controlled line to the antenna.
Use a reliable communication protocol such as SPI or UART, and ensure that the microcontroller is configured to match the SMS3.3.TCT's communication settings. Also, use a common ground plane and decouple the power supply to minimize noise.
The maximum transmit power of the SMS3.3.TCT is +20 dBm, but it can be adjusted to a lower value depending on the application and regulatory requirements.
Use a 1/4 wavelength monopole antenna or a dipole antenna with a 50-ohm impedance. The antenna should be tuned to the operating frequency of the SMS3.3.TCT (around 868 MHz or 915 MHz) and should be placed at least 10 mm away from the PCB.
The typical current consumption of the SMS3.3.TCT is around 20 mA in transmit mode and 1 mA in receive mode, but it can vary depending on the operating frequency, data rate, and other factors.
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