STM32L073 + sx1272 (downlink rssi)

[Chris Oh]

Posted on March 09, 2018 at 05:13

Hello,

I'm using LoRa network with sx1272 + stm32L0 (node),

and RAK831 (gateway) , also custom network server.

i found that uplink rssi printed in gateway is quite good enough(-32dBm), however, downlink rssi printed in node(stm32L0) is quite bad(-90dBm).

the distance from each other is same, and i use SF 12 & same channel.

the power level gateway use is 23dBm which is the standard of Korea.

I don't know why this difference happens.

is this problem maybe from end node's hardware issue or sx1272's bad sensitivity?  or gateway emitting low-quality signal (maybe it's not).

[Tesla DeLorean]

Posted on March 09, 2018 at 06:45

>>

is this problem maybe from end node's hardware issue or sx1272's bad sensitivity?

Then perhaps you need to establish some baseline using some different nodes/implementations? Say with SX1272 or SX1276 shields, or Murata module on a LoRa Discovery board. Or look at implementations with an LNA on the receive side.

[Andrew Neil]

Posted on March 09, 2018 at 08:48

Clive One wrote:

you need to establish some baseline using some different nodes/implementations? 

Agreed.

Can you try a different gateway?