nRF52840 coded phy sensitivity

RE: nRF52840 coded phy sensitivity

Sigurd — Mon, 04 Dec 2017 15:28:34 GMT

Hi Christian,

Please create a new question here on DevZone regarding this issue.

RE: nRF52840 coded phy sensitivity

Christian — Thu, 30 Nov 2017 14:37:22 GMT

Hi,

Is there anything else that needs to be considered apart from the soft device version? I used soft device 6.0.0-6.alpha and modified the att_mtu_throughput example to print the RSSI when changed, but connection between two nrf52840 boards is still lost at around -97 dbm.

Thanks in Advance

RE: nRF52840 coded phy sensitivity

Sigurd — Fri, 06 Oct 2017 14:00:52 GMT

Hi all,

The new S140 SoftDevice is now released and can be downloaded from here:

www.nordicsemi.com/.../60624

This version have fixed the BLE 5 Long Range issues that was present in the previous versions. From the S140 6.0.0-6.alpha release notes:

The SoftDevice now implements a range delay (packet time of flight compensation) corresponding to a distance of 5 km when using LE Coded PHY

RE: nRF52840 coded phy sensitivity

Sigurd — Thu, 28 Sep 2017 12:49:46 GMT

The new S140 SoftDevice version with the full fix is right around the corner... please give it some more time. I will update this post when it's released. Sorry for the inconvenience.

RE: nRF52840 coded phy sensitivity

slowhand — Thu, 28 Sep 2017 10:26:27 GMT

I have not noticed updates yet. I am also still interested...

RE: nRF52840 coded phy sensitivity

Andrzej Kaczmarek — Thu, 28 Sep 2017 10:23:48 GMT

Hi,

Any update on this? My project does not use SoftDevice so if it's possible to have some magic values (as in errata 164) to test with, would be great.

RE: nRF52840 coded phy sensitivity

slowhand — Mon, 07 Aug 2017 11:42:19 GMT

Ok, thanks for the update. We shall wait!

RE: nRF52840 coded phy sensitivity

Sigurd — Mon, 07 Aug 2017 11:38:03 GMT

Hi,

It seems that some additional workaround is needed to get the full sensitivity in long range mode. I.e. the workaround in Errata 164 is not sufficient to get the -103 dBm sensitivity (and will not give you better range). Final workaround and new version of the SoftDevice will be released when the final verification and testing is complete. Note that the current S140 SoftDevice version is still in alpha version. Sorry for the inconvenience.

RE: nRF52840 coded phy sensitivity

slowhand — Thu, 03 Aug 2017 08:10:09 GMT

Sorry, I noticed your comment late. I just came back to this and added the two suggested lines before ble_stack_init. The last RSSI value in my field test a moment ago was -95dBm. Not sure if I just added the lines to correct place. I used the long range multilink central and blinky peripheral example.

RE: nRF52840 coded phy sensitivity

KV — Mon, 17 Jul 2017 18:10:45 GMT

If I have to add this workaround to the ATT throughput demo, what would be the best place to add this workaround? I was thinking of adding this to "preferred_phy_set" function. I assume, advertising_start and scan_start function would turn on the radio.

RE: nRF52840 coded phy sensitivity

slowhand — Fri, 14 Jul 2017 09:06:54 GMT

Good, thanks!

RE: nRF52840 coded phy sensitivity

Sigurd — Fri, 14 Jul 2017 08:49:30 GMT

I would hope maybe in 1-2 weeks (release in end of July).

RE: nRF52840 coded phy sensitivity

slowhand — Fri, 14 Jul 2017 08:22:20 GMT

Ok, thanks! Do you want to give any guess on the 4.-alpha release timing?

RE: nRF52840 coded phy sensitivity

Sigurd — Fri, 14 Jul 2017 08:18:22 GMT

Hi,

The nRF52840 have -103 dBm Sensitivity in coded PHY(125kbps BLE mode). The reason why the connection drops at -96 / -97 dBm is a bug in the current alpha versions of the S140 SoftDevice. Errata with workaround for this bug can be found here: RADIO: Low sensitivity in long range mode

Fix will be included in the upcoming S140 5.0.0-4.alpha release.