RSSI and range efficiency in nrf51822

RE: RSSI and range efficiency in nrf51822

trk — Tue, 15 Sep 2015 19:51:10 GMT

Thanks Dave. That was helpful

RE: RSSI and range efficiency in nrf51822

Dave_couling — Tue, 15 Sep 2015 19:42:51 GMT

Those are just estimated values based on experience. I find my connection is stable until MCP reads ~90dB.

Techniques for increasing range are all hardware based. Tuning your Transmission line to 50Ohms, selecting a proper antenna. Tuning for that Antenna. It takes experience and RF knowledge to optimize these parameters. There are alot of whitepapers available online to get you started.

RE: RSSI and range efficiency in nrf51822

trk — Tue, 15 Sep 2015 19:35:44 GMT

Thanks dave.how do you come up with those values for tx loss, close path loss and Rc loss?So by any chance is there a threshold rssi,untill where connection remains stable? And any other techniques to increase range?

RE: RSSI and range efficiency in nrf51822

Dave_couling — Tue, 15 Sep 2015 19:27:30 GMT

You have to account for Transmitter Loss, Receiver Loss and Path Loss. Seeing -50dB at close distances sounds about right for a decent Transmitter and Receiver. Example Calculation below:

+4dB - 10dB (Tx loss) - 30dB (~close range path loss) - 10dB(Rx loss) = -46dB