RSSI on LoRa-E5 vs nucleo-WL55JC1

[spa23]

Hi

i'm just sitting and messing with a few lora boards.

I find that nucleo-WL55JC1 has approx 10dbm RSSI better than seeed LoRa-E5, and that nucleo-WL55JC1 also transmits with a more powerful signal, what is your experience ??

with best regards

[Andrew Neil]

How, exactly, are you determining that?

What, exactly, do you mean by, "seeed LoRa-E5" - a board? a module?

https://www.seeedstudio.com/LoRa-E5-Wireless-Module-p-4745.html

Antennas are bidirectional - so you'd expect better performance in Rx to be reflected in better Tx.

[spa23]

I'm using the E5 mini Dev-board.

[Andrew Neil]

So this: https://www.seeedstudio.com/LoRa-E5-mini-STM32WLE5JC-p-4869.html ?

What happens if you swap antennas between this & the Nucleo?

If the improvement follows the antenna, then you have your answer!

[spa23]

Yes, and I get the same result with both antennas.

[Louis AUDOLY]

Hello @spa23​ ,

It's difficult to say if this is normal to have around 10 dBm less in reception because we do not compare the same board, and maybe even not the same package.

We can have differences between 2 boards depending of the matching design network so it's difficult to tell you where is located with precision the difference between those two boards.

Regards

[spa23 · Accepted solution]

i found the error, it was the clock domain for the one gpio pin that was not right, so the one gpio did not work .. :)

my measurements if anyone could be interested ..

Nucleo is a littel bit better.

[Andrew Neil]

Thanks for the update.

How does a GPIO pin mis-configuration affect RSSI?

Please mark the solution:

[spa23]

Because that it was one of the rf switch control pins, so the rf switch never switched.

[Andrew Neil]

Aha - that'd do it!