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Adam Zobrist
Adam Zobrist
Associate
March 15, 2018
Question

S2-LP Signal Testing

  • March 15, 2018
  • 1 reply
  • 802 views
Posted on March 15, 2018 at 15:57

Hello,

I'm currently evaluating the S2LP radio chip on an FKI868V1 and I'm trying to reach sensitivity marks described in the datasheet.

I'm having trouble getting the kind of sensitivity expected when testing at 300 bps data rate.  The exception rate of packets is less than it is at 1.2 kbps and I can't understand why.

Can someone please help me achieve better results at the lower data rate?

-Adamz

#s2-lp
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    1 reply

    Winfred LU
    Winfred LU
    ST Employee
    March 16, 2018
    Posted on March 16, 2018 at 09:25

    Hi Adamz,

    What would be your test condition?

    Maybe try to lower the channel filter?

    Best Regards,

    Winfred

    Adam Zobrist
    Adam ZobristAuthor
    Associate
    March 20, 2018
    Posted on March 20, 2018 at 18:58

    Hello Winfred,

    Thank you for responding...

    I am using a pi network with a know loss of approx. 90 dB and I've set the output transmitter power to -31 dBm

    I'm testing both the 1.2 kbps and 300 bps and seem to get worse results with 300 (12 to 15% packet drop as compared to 3 to 5 %)

    I've tried decreasing channel filtering and no effect.

    I would really be interested in a register dump of the radio settings being used for marks placed in data sheet.

    Thanks for any help,

    -Adamz

    Winfred LU
    Winfred LU
    ST Employee
    March 22, 2018
    Posted on March 22, 2018 at 04:26

    Hi Adamz,

    Agree that 300 bps should have better results than 1.2 kbps.

    Since you were testing close to the sensitivity limit, i wonder if the environment noise is low enough for the tests, or maybe air condition fluctuated between 300 bps and 1.2 kbps tests. 

    Could you repeat the tests in a shielding room?

    About the register settings for marks in data sheet, i don't have that information either. I'll leave it for someone else to comment further.

    Thank you.

    Best Regards,

    Winfred

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