NRF905 range

RE: NRF905 range

xonoy18882 — Tue, 26 Sep 2023 14:37:12 GMT

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:

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

RE: NRF905 range

Håkon Alseth — Tue, 15 Dec 2015 08:24:02 GMT

No, this is specific to our sub-GHz radios. The overall range will depend on your receiver sensitivity and the output power of the signal you're receiving. This is also called "RF link budget".

We provide the ICs only, and ofcourse how to integrate it into a design. We do not make modules for high-volume production.

RE: NRF905 range

BasicPoke — Mon, 14 Dec 2015 15:41:52 GMT

Håkon, Is this inherently the range of any 433 MHz RF system? It does not depend on the nRF905 IC does it? I am not very versed in RF so I need help understanding this. Does Nordic make complete RF modules with antenna that can be incorporated into another design? Thanks.

RE: NRF905 range

Håkon Alseth — Tue, 03 Jun 2014 08:01:19 GMT

Alignment range is the operating frequency that the RF IC is able to be setup in. For instance, on the nRF24L-series, it's from 2.400 - 2.525 GHz.

RE: NRF905 range

Mustafa AYDIN — Thu, 29 May 2014 15:16:15 GMT

Hi,

What about Alignment Range (AR) or sometimes as called frequency range? I mean Lower and Upper frequencies. There is an example table on the datasheet which can be used in this way but not sufficient. There is a definition of AR in this document: www.etsi.org/.../en_300793v010101v.pdf

Thanks already.

RE: NRF905 range

Håkon Alseth — Mon, 06 Jan 2014 16:47:41 GMT

Hi Fred,

Using 250 kBit on-air data rate + external RF PA, then ~250 meters sounds reasonable.

Obtaining a range of 1 km will be hard. With our sub-GHz radios, you can get about 500-600 meters in an open area (@433 MHz) w/ a finely tuned design/antenna.

Best regards Håkon