15 responses

  1. David heath

    I have seen the future and it is now. Thanks

  2. dan

    good work, tobias. except there is a real latency with web based receivers that cannont match real
    time signal sampling from MY antenna, hi. WHEN i can hear the sigs anyway…

  3. davor kordic

    Hello Tobias

    Tks for contact about SDR. I made two peaces of SDR receiver this year. First one ZETA SDR for 40m and second is DR 2++ from YU1LM but I have a few days to finish double symmetric supply for it HI.
    For this moment I experiment with one receiving wire antenna made from old small transformer about 10 m long to the nearest three HI. It works. I have old 16 bit sound Creative Labs and for this moment software is Rocky and M0KGK decoder becouse my old 1.1 GHz computer.I just try to connect signal from Creative Labs receiving sound card to second on board receiving sound card reserved for MixW2 couse I heard yesterday afternoon good RTTY signal.Excuse me about my website because I made it with old tools and is on Croatian language only but you can see our radio club IOTA expeditions and my small hobbies electronic area. The SDR pages are still waiting to be fulfilled.

    73 Davor

  4. Scot R. Morrison

    A new species of high frequency (HF) radio is evolving and its technological maturity is at least a decade or two down the road. Anyone, like yourself, who envisions a software defined radio (SDR) future is already ahead of the curve, in fact, pioneering our HF frontier.

    I’m building out my HF station, slowly, ever so slowly and I see SDR technology in the shack. Perhaps, in the beginning, as a means to improve receive capabilities, additionally, I’m hedging a future when SDR will significantly impact and improve HF low power operations.

    You are blazing the trail toward a new frontier where a new species of HF radio already exists.


  5. Gary S

    SDR is the future and yes its getting much closer ;-)

    Myself, I am coming from 10 years out of amateur radio except for listening with a ft-817 for last few.

    I’m tired of buying “appliances” and want the pleasure of doing some building and it looks like SDR is definately the way to go. The HPSDR project has the “Hermes” coming soon (for rx/tx) but the “funkamateur” will probably be cheaper and sooner.

    I still am looking for the one I never had, a Drake TR4c which was the “item” when I became a ham, back in the mid ’70′s.


  6. DL5RMH

    Hi Tobi, thanks for this very interesting article. I hope to get my Softrock SDR working as soon as possible to expore SDR by myself.
    73s de Martin, DL5RMH

  7. Mike N4GU

    Much work has been done (and continues to be done) in the amateur community focusing on the RF and signal processing portions of the SDR. The user interface is lagging behind. Keyboards as input control devices are not optimal. As a UI for tuning in a radio signal, you can’t beat a knob as a man-machine interface. Yes, there are some knobs out there, but the potential, and acceptance, of the SDR will occur when we can customize the UI as easily as the other elements.

    Very good piece, Tobias.

    73, Mike N4GU

  8. Bob K7YB

    Interesting site and I will bookmark it for future reference and education. I’m amazed by the excellent signal to noise (to my ear) characteristics of SDR on PA3FWM’s receiver. Got a shack full of old stuff (Drake 2b/Collins KWM2/etc) and newer gear (IC756/FT857)…but the NEW stuff (SDR) has me excited about the future of the hobby and the advances technology can bring.

  9. Greg Overkamp

    The article states “The QSE mixes the RF signal into a baseband signal” when in fact a QSE does just the opposite. A Quadrature Sampling Exciter takes I and Q baseband as its inputs, and produces RF as its output. With the lofty title of “Do you truly understand the SDR concept?”, I would expect the author to do so.

    • Tobias

      Hey Greg!
      Thanks for your comment! Indeed, I mixed up QSE with QSD. I just corrected it in the post. Thanks again for the notice!

  10. Victor RN4CW /UR7GU/

    Bad not see this page half year early.

  11. Edwin G Delgado

    Excellent description, without even a single mathematical equation…… Good step by step procedural (and easy to follow) of what really happens inside an RF/DSP system to detect and reproduce ham (and several others) communication. The diagrams and description can be followed by even a kid. Thanks to the description …. and thanks for the few links for further info………

    WP3WC…. Electrical Engineer with Master Degree.in RF and Power Electronics.

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