NRF905 range

[Fred Lamer]

Hi everyone, I am using two NRF24L01+ for a project and recently bought the NRF24L01+LNA+PA device from ebay. It states that the maximum range should be about 1km but users say they reached only 250 km. I need a really long range device for my project and I dont need a fast data rate. I would like to know what could be the range of the NRF905 in the lowest frequency available? Thanks, Fred

[xonoy18882]

The NRF24L01+ and NRF24L01+LNA+PA modules are known for their relatively short-range communication, typically up to a few hundred meters under ideal conditions. While adding an LNA (Low-Noise Amplifier) and PA (Power Amplifier) to the NRF24L01+ can extend the range, achieving a range of 1km or more may not be realistic in real-world scenarios due to various factors like interference, obstacles, and the specific operating environment.

The NRF905 is another RF module that operates in the sub-GHz frequency range and is designed for longer-range communication compared to the NRF24L01+ series. However, the actual range you can achieve with the NRF905 module depends on several factors, including frequency, transmit power, and the environment.

Here are some key points to consider:

1. Frequency Selection: The NRF905 operates in the 433MHz or 868MHz ISM (Industrial, Scientific, and Medical) bands, which are lower frequencies than the 2.4GHz band used by the NRF24L01+. Lower frequencies tend to have better range performance because they can penetrate obstacles more effectively.

2. Transmit Power: The NRF905 allows you to adjust the transmit power, which can significantly impact range. Higher transmit power settings can extend the range, but they may also consume more power.

3. Antenna: The choice of antenna can have a substantial impact on range. Make sure to use an appropriate antenna for your desired range.

4. Line of Sight (LOS): Range estimates are often based on ideal conditions with a clear line of sight between the transmitter and receiver. In real-world scenarios with obstacles, buildings, and interference, the range will likely be less than the maximum specified.

5. Interference: Interference from other RF devices, electronic noise, and the specific RF environment in your location can affect the achievable range.

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7. Data Rate: You mentioned that you don't need a fast data rate. Slower data rates can result in longer range because the receiver has more time to detect and demodulate the signal.

8. Regulatory Considerations: Be sure to comply with local regulations regarding radio frequency transmission power and frequency bands.

To determine the range you can achieve with the NRF905 in the lowest available frequency band (433MHz or 868MHz), you will need to conduct range testing in your specific environment. Start with the lowest transmit power setting and gradually increase it while monitoring the range until you achieve the desired coverage.

Keep in mind that achieving a range of 1km or more may still be challenging in non-line-of-sight scenarios or environments with significant interference. Real-world conditions can vary widely, so testing in your specific use case is essential for accurate range estimation.