Problems with NRF24L01+ with external antenna if sensor node is to close



  • I don't know if this is a known feature or behaviour but I found that if gateway node with external antenna and sensor node (pcb antenna) are too close (< 1-2 m) pairing will not finish and node will not work.
    my setup: ethernet gateway with W5100 and NRF24L01+ radio with external antenna like this:
    0_1478680973067_s-l1600.png

    two sensor nodes, one light sensor and on relay sensor with two relays, all placed on my working desk
    As these are my first sensors I thought I did something wrong but no pairing was finished. Eventually I screw off the external antenna and both sensors immediately connected to the gateway. I tested with different 2.4 GHz antennas, same result. I had to move sensor node to another room, then I could attach antenna and communication is ok.

    Do I have to reduce transmit power?
    Did anyone made similar findings?
    I'm using mysensors-2.0.1-beta, but same result with other versions.

    Best regards
    jogant


  • Mod

    @jogant yes this is a common problem. The easiest solution is to have greater distance between the nodes.


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