Repost: Can the LR Freakduino do BPSK-20kbps (not just BPSK-40kbps)?

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This topic contains 2 replies, has 1 voice, and was last updated by  akiba September 4, 2017 at 5:51 am.

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  • #417

    akiba
    Keymaster

    [This topic reposted from the old forum]
    In relation to the Atmel AT86RF212 used by the long range Freakduino, a poster from a different forum makes the comment:

    “A look at an Atmel document which describes Atmel’s AVR2025 software package (that’s their 802.15.4 MAC stack), a sub-1GHz 802.15.4 radio on channel page 0 falls under the “MAC-2003″ space, is BPSK, and can do 20 kb/s @ -110dBm or 40 kb/s @ -108dBm. ” (that quotation is from here: http://cocoontech.com/forums/topic/2648 … /?p=215305)

    So, it looks like the LR Freakduino could get an extra 2db of link budget with that approach, making the Long Range Freakduino even longer range. That would be a good thing, right?

    How to do it then? As far as I can tell, the Chibiarduino code only supports BPSK at 40kbps, not 20kbps. Is that correct?

    Akiba
    FreakLabs Open Source Wireless
    Twitter: @freaklabs
    Facebook: https://www.facebook.com/freaklabswireless

  • #418

    akiba
    Keymaster

    Actually, I notice that the Atmel AT86RF212 datasheet itself talks about BPSK-20 quite a bit: http://www.atmel.com/images/doc8168.pdf

    It’s listed as one of the possible PHY modes in Table 7-5.

    Akiba
    FreakLabs Open Source Wireless
    Twitter: @freaklabs
    Facebook: https://www.facebook.com/freaklabswireless

  • #419

    akiba
    Keymaster

    I just integrated BPSK-20 support and also removed the scrambler settings from data rates that don’t need it. I also added support for OQPSK-500 and OQPSK-1000 bps.
    Thanks 🙂

    Akiba
    FreakLabs Open Source Wireless
    Twitter: @freaklabs
    Facebook: https://www.facebook.com/freaklabswireless

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