Standard shipped 868 Antenna's....



  • As I now have the glass-fiber antenna I wanted to measure the difference with an RF Vector Analyzer.
    The glass-fiber is a big improvement and the standard 868 are questionable.

    Here the results (calibrated) ;
    (middle top the frequency measured where the yellow triangle marks this frequency).
    The 2 standard ones compared are very different and both look to have there strength at a much higher frequency.
    My question to RAK : is this normal or are the antenna's faulty / for different use (although they are marked 868) ?
    S11:

    1. wifi antenna as reference.
      0_1530125737100_Wifi control.jpg

    2. the glass-fiber
      0_1530125808843_Glasfiber 868.jpg

    3. Antenna 1 - 868 standard
      0_1530125887558_Antenna 1 - 868.jpg

    4. Antenna 2 - 868 standard
      0_1530125899493_Antenna 2 - 868.jpg

    VSWR:

    1. Antenna 1 - 868 standard VSWR
      0_1530131263089_Antenna 1 - 868 vswr.jpg

    2. Antenna 2 - 868 standard VSWR
      0_1530131272915_Antenna 2 - 868 vswr.jpg

    regards,
    Harald



  • Just to get the question clear;

    My question to RAK : is this normal or are the antenna's faulty / for different use (although they are marked 868) ?

    Harald



  • Well, I measured my standard antennas around 1100MHz...



  • These antennas could damage the HW because of reflection as if there was no antenna connected.
    After 14 day's I guess it's of no importance to RAK.

    Harald



  • HI,Harald and Eiten, we will provide formal reply soon. Sorry for missing the message



  • Hello, I am very sorry, can you take a photo of the antenna you tested?



  • @Harald

    We made same testing but pls note we put the antenna in vertical position on table. The performance should be fine.pls see the snapscreen! Can we resend an antenna to you for testing again if you like?

    S11
    0_1531920087462_S11.jpeg
    868M VSWR
    0_1531920192893_VSWR.jpeg


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