Software Defined Radio Direction Finding (SDRDF)

Software Defined Radio Direction Finding (SDRDF)

How to do Radio Direction Finding with a Software Defined Radio (USRP/GNU Radio) http://spench.net/ | @spenchdotnet | http://twitter.com/spenchdotnet More in…

/17 Comments/by
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17 replies
  2. balint256
    balint256 says:

    You’re definitely on the right track 😉 It would be (theoretically) exactly
    as you describe: additional hardware would be necessary to divide the
    master clock down to a suitable rate for the antenna switch – and the rest
    is done in software!

    Reply
  3. balint256
    balint256 says:

    Not specifically an Australian thing – more a variation on a theme for the
    higher frequencies. Should be said with great enthusiasm and conviction!
    There’s always a first 🙂

    Reply
  5. MauriatOttolink
    MauriatOttolink says:

    Pity he was in OZ and the mic was in NZ. Why don’t digital specialists know
    any thing about sound? Pretty grim sound track and frequently
    unintelligible. Every time he dropped his voice often and just ‘wasn’t
    there’. Pity, could have been a great video. And the constant rumble…. Oh
    Dear! Couldn’t keep up the interest. Got sick of him ‘throwing away’ words.
    No doubt some clever devil will hound me for criticising. Doesn’t make me
    wrong!

    Reply
  7. Nick Oppen
    Nick Oppen says:

    Thanks for the interesting video. Do you really need to switch each antenna
    on and off in sequence? Would it not be possible to measure the phase
    difference from each one on a continuous basis?

    Reply
  9. FirstToken
    FirstToken says:

    At video time 02:20 “DUFF DUFF”. Is this an Australian thing? I believe
    most places (at least most English/American speaking that I have dealt
    with) use the term HUFF DUFF for HF DF, but I don’t think I have ever heard
    DUFF DUFF applied before.

    Reply
  11. Matt Robert
    Matt Robert says:

    Balint (VK2FUNK), myself (VK2TVK) and Nick (VK2DAP) were out getting dinner
    in Newtown, Sydney, when Balint and myself started discussing RDF and how
    the doppler could work in SDR. While we were talking about how to switch
    the antennas, Nick loudly proclaimed “HUFF DUFF!” in an enthusiastic voice.
    It stuck, however, because we were doing it on VHF/UHF (specifically UHF CB
    and GRN band) we dropped the HF part and it became DUFF DUFF. And yes, it
    must be proclaimed loudly in a boisterous voice!

    Reply
  12. Roy Cohen
    Roy Cohen says:

    Hmm would there be a way to use the realtek 20 dollar dongle to do this if
    you could somehow get the clock out of it and into the switch? or does it
    just not have enough power for that.

    Reply
  13. Roy Cohen
    Roy Cohen says:

    maybe breaking out the oscillators pins on the dongle and then feeding
    those into some signal processing to be able to switch the antennas at the
    same clock as the cheap radio module.

    Reply

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