SDR- standalone with Red Pitaya

Discussion in 'Homebrew and Kit Projects' started by DH1AKF, Jul 9, 2016.

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  1. DH1AKF

    DH1AKF Ham Member QRZ Page

    Red Pitaya - SDR-Transceiver or Vector Network Analyzer ... a new opportunity for home brewing.
    One year ago I started with the goal, to make a SDR station with the 240$ "Red Pitaya open-source-software measurement and control tool".
    In my opinion was a small station with RedPitaya as the heart, and a STM32F7Disco as controller and display unit. Workbench2.jpg
    The main menue on STM32F7 Disco:

    The great work of Pavel Demin, a particle physist and software developer (located in Belgium) gave us ham radio brewers the opportunity to construct our own station. With PC, with laptop, tablet or phone as controller, or with a STM32. Please look, what Pavel has developed in the meantime:
    How you can see, he has also developed an interface to make the Red Pitaya working with the big HPSDR software- package.
    And my shortwave antenna I could analyze with the Vector Network Analyzer, also running on Red Pitaya.

    The next picture shows my first approach for a 400W PA with BLF368, built on a PCB from China (eBay).


    My newest mini program is a routine for frequency selection without tuning knob:
    The left table is for choosing the tuning step. Above the actual frequency. The three green rings serve to tune in the following manner:
    Outer circle increases or decreasese the frequency after all 15 degree finger glide. The middle tunes 10 times faster, and the inner circle 100 times. The active circle enlightes in yellow. stop is done with the red dot or the outer grey area. The idea for this control came from a ham (Jacinto, CU2ED), who asked me to implement an optical endcoder as tuning knob.

    I hope, I arouse your interest.

    73, DH1AKF (Wolfgang, Germany)

    additional links:
    K7UL, AH7I, KA0KA and 1 other person like this.
  2. DH1AKF

    DH1AKF Ham Member QRZ Page

    New VFO tuning menu
    After some days of testing I have programmed a new "flywheel" simulation for frequency tuning of the Red Pitaya with better performance.
    The problem of the last solution was to let the finger run in cirle - slightly difficult.
    Now I took three circle sectors, you can strike them out of the wrist without eye control.
    The behavior is similary a flywheel, the picture is animated. VFO_Wheels2.jpg

    Another numerical input method is also available: P1000535.jpg
    73, Wolfgang (DH1AKF)
    KA0KA likes this.
  3. AF6LJ

    AF6LJ Ham Member QRZ Page

    How did the power amp turn out?
    Were you satisfied with it?
    What Drain voltage are you running it on?
  4. DH1AKF

    DH1AKF Ham Member QRZ Page

    Maximum output was 330W on 15m with 4W input. 19.9 A drive current.
    The drain voltage is ca. 30V, because of the max voltage of the transistor.
    AF6LJ likes this.
  5. AF6LJ

    AF6LJ Ham Member QRZ Page

    Good Deal sounds like a fun project all by itself.
  6. DH1AKF

    DH1AKF Ham Member QRZ Page

    New design of the main window. Now with spectrum view...


    ... and waterfall diagram
    KA0KA and VK4HAT like this.
  7. VK4HAT

    VK4HAT XML Subscriber QRZ Page

    The interface looks great. I have a red pitaya maybe one day I will look at using it to design a rig :)
  8. K8JD

    K8JD Ham Member QRZ Page

    how much more that a TS520 does all that cost ? :eek:
    This is serious experimenter stuff !
  9. DH1AKF

    DH1AKF Ham Member QRZ Page

    AA7QQ and VK4HAT like this.
  10. AA7QQ

    AA7QQ Ham Member QRZ Page

    I'm doing similar with a LimeSDR USB, Udoo X86 Ultra & an old touchscreen computer. Using an FT-857 for BPFs, PA & LPFs.


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