Software Defined Radio Direction Finding (SDRDF)

1. 

   Kevin Groce says:

   May 16, 2014 at 2:20 PM

   Reply
2. 

   balint256 says:

   May 16, 2014 at 2:04 PM

   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 says:

   May 16, 2014 at 1:39 PM

   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
4. 

   mistertentpole says:

   May 16, 2014 at 1:08 PM

   could you calculate bearing AND distance if you know the transmitter
   wattage and antenna type?

   Reply
5. 

   MauriatOttolink says:

   May 16, 2014 at 12:46 PM

   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
6. 

   CorrosiveOne says:

   May 16, 2014 at 12:19 PM

   Cool but it seems like it’d be easier to just get a conventional Ramsey kit

   Reply
7. 

   Nick Oppen says:

   May 16, 2014 at 11:57 AM

   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
8. 

   Roy Cohen says:

   May 16, 2014 at 11:07 AM

   But I know nothing about RF so I could just be terribly mistaken haha

   Reply
9. 

   FirstToken says:

   May 16, 2014 at 10:50 AM

   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
10. 

    m1aws says:

    May 16, 2014 at 10:43 AM

    Perhaps “duff duff” is taken from the sound as the signal comes and goes
    while duffing?

    Reply
11. 

    Matt Robert says:

    May 16, 2014 at 10:15 AM

    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 says:

    May 16, 2014 at 9:36 AM

    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 says:

    May 16, 2014 at 8:42 AM

    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
14. 

    fnordianslippers says:

    May 16, 2014 at 8:39 AM

    Interesting. Thanks for sharing.

    Reply
15. 

    Steve Wright says:

    May 16, 2014 at 8:34 AM

    Very nicely presented

    Reply
16. 

    Your Nerds (Nerd News) says:

    May 16, 2014 at 7:55 AM

    Reply
17. 

    Troy Sanders says:

    May 16, 2014 at 7:20 AM

    Where can the BorDUF software be found?

    Reply

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