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spa23
spa23
Associate III
May 24, 2022
Solved

RSSI on LoRa-E5 vs nucleo-WL55JC1

  • May 24, 2022
  • 12 replies
  • 4004 views

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

This topic has been closed for replies.
Best answer by spa23

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 ..

0693W00000NrJXWQA3.pngNucleo is a littel bit better.

12 replies

Andrew Neil
Andrew Neil
Super User
May 24, 2022

How, exactly, are you determining that?

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

0693W00000NqYZGQA3.pnghttps://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.

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
spa23
spa23Author
Associate III
May 24, 2022

I'm using the E5 mini Dev-board.

Andrew Neil
Andrew Neil
Super User
May 24, 2022

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!

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
spa23
spa23Author
Associate III
May 24, 2022

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

Louis AUDOLY
Louis AUDOLY
ST Employee
June 7, 2022

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
spa23AuthorBest answer
Associate III
June 7, 2022

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 ..

0693W00000NrJXWQA3.pngNucleo is a littel bit better.

    Andrew Neil
    Andrew Neil
    Super User
    June 7, 2022

    Thanks for the update.

    How does a GPIO pin mis-configuration affect RSSI?

    Please mark the solution:

    0693W000008y9fZQAQ.png

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    spa23
    spa23Author
    Associate III
    June 7, 2022

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

    Andrew Neil
    Andrew Neil
    Super User
    June 7, 2022

    Aha - that'd do it!

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    DWalk.3
    DWalk.3
    Associate III
    January 25, 2024

    I saw that after the fact. It looks like my RF pins are correct.

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