RFM95W-868S2

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RFM95W-868S2 is a kind of RF Transceiver Modules which mainly used for long range wireless communication. In this article we will introduce the application field and working principle of this module.

I. Introduction

The RFM95W-868S2 is a high-performance, low-power radio transceiver module by HopeRF, operating in the 868 MHz to 869 MHz ISM band. It is bundled with an ATmega128RFA1 MCU processor board, providing a complete solution for designing your own wireless communication system. The RFM95W-868S2 module is a powerful and easy-to-use tool to get you started with RF communication quickly.

II. Application Field

The RFM95W-868S2 is ideal for a broad range of wireless applications, such as radio frequency identification (RFID) systems, automatic meter reading (AMR) systems, access control systems, industrial control systems and remote control systems. It can also be used in designs for home automation, lighting control, and other similar applications. With its high output power (up to 19 dBm) and high sensitivity (-133 dBm, 10 dB SNR), it is capable of long-range communication of up to several kilometers.

III. Working Principle

The RFM95W-868S2 consists of an RFM module, radio transceiver, power amplifier, and an on-chip balun. The RFM module has an ARM Cortex-M3 microcontroller and provides all the necessary logic to control and manage the radio transceiver and the power amplifier. The radio transceiver uses a low-noise amplifier, wideband frequency mixer, and modulator/demodulator circuit, allowing communication between radio nodes. It also includes a voltage-controlled oscillator, a digital-controlled oscillator (DCO) for frequency synthesis, and a baseband filter.

The power amplifier provides a power increase of up to 19dBm, allowing for long-range communication. The on-chip balun is used to transform the unbalanced differential signal to a balanced single-ended signal, ensuring a transmission line that has minimal losses. The RFM module itself can transmit and receive data in a point-to-point or point-to-multipoint configuration.

IV. Conclusion

The RFM95W-868S2 is a versatile and powerful radio transceiver module that can be used in a wide variety of applications. Its high-performance, low-power consumption and ease-of-use make it an ideal choice for a broad range of wireless applications. With its high output power (up to 19 dBm) and high sensitivity (-133 dBm, 10 dB SNR), it is capable of long-range communication of up to several kilometers.

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