Appropriate value of received RSSI

RE: Appropriate value of received RSSI

loquat — Sat, 28 Nov 2020 09:03:45 GMT

OK.Thanks.

RE: Appropriate value of received RSSI

Mttrinh — Fri, 27 Nov 2020 15:28:55 GMT

If the received valued is out of the valid range, it means that the value isn't accurate and is affected by some other factor. The correct value will be something different, like -40dbm or -90dbm.

As it is mentioned in the other thread I referred to

Low RSSI could be caused by any number of things, RSSI is simply measured received power at receiver. The cause of reduced received power cannot be read from RSSI directly. It could be mismatch in RF front-end (matching network/antenna), fading due to multi-path, obstacles, etc.

RE: Appropriate value of received RSSI

loquat — Thu, 26 Nov 2020 14:04:57 GMT

For example, if the received RSSI value is -100dbm, does that mean it could actually be -40dbm or -90dbm? Or does it mean a very small RSSI value?

RE: Appropriate value of received RSSI

Mttrinh — Tue, 17 Nov 2020 10:58:43 GMT

It means the RSSI value can no longer be trusted.

RE: Appropriate value of received RSSI

loquat — Sun, 15 Nov 2020 05:23:28 GMT

"it isn't reliable. "
What does this mean?
1. The value of the received data is unreliable.
2. The accuracy of the RSSI value when received is unreliable.
3. The RSSI value when received is unreliable.

RE: Appropriate value of received RSSI

Mttrinh — Fri, 06 Nov 2020 11:16:25 GMT

Hi,

According to chapter 6.20.15.9 of the nRF52840 Product Specification v1.1, the accuracy is ±2dB. For the nRF52840, the RSSI accuracy valid range is -90 to -20 dBm. If the RSSI value is outside this range then it isn't reliable.

Just be aware that there are many factors that can affect the RSSI value, see this thread.