EU1KY Antenna analyzer with STM32F7Disco (DH1AKF mods)

Discussion in 'Homebrew and Kit Projects' started by DH1AKF, Jan 10, 2018.

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  1. DH1AKF

    DH1AKF Ham Member QRZ Page

    Hi all homebrewers,
    after successful building this famous analyzer, I want to announce it here.
    Please have a look into the gallery:

    Some landmarks:
    - frequency range: 500 kHz .. 450 MHz
    - uses a touch screen (STM32F7 Discovery)
    - calculates real and complex antenna impedance
    - shows the Smith- diagram
    -calculates the matching values for LC- adaption
    - all software is open source.

    My intention for completion of the software was, to improve the visibility at daylight, and to complement a new "Multi SWR " menu:[​IMG]

    Here you can find the circuit diagram and some pictures of the result: (in German)
    and here: (in Russian)

    73, Wolfgang (DH1AKF)
    OK1RR, EI8DRB, KU1CW and 1 other person like this.
  2. DH1AKF

    DH1AKF Ham Member QRZ Page

    After some month's of development, now some new features of the EU1KY analyzer are available:

    - frequency range: 100 kHz .. 600 MHz
    - Multi- Band SWR menu
    - colors switchable between inhouse / Daylight
    - automated cursor
    - Generator mode with AM / FM
    - Tune / SWR menu with sound and big coloured Progress bar
    - Scan frequency menu (Measurement of frequency, amplitude, power) with spectrum diagram

    Please have a look at the pictured documentation:

    73, Wolfgang DH1AKF
    KK4CUL and EI8DRB like this.
  3. EI8DRB

    EI8DRB Ham Member QRZ Page

    Many thanks for this Wolfgang. Some great additions to an already excellent device.
  4. WA5KM

    WA5KM Ham Member QRZ Page

    Beautiful project. What is the cost compared to commercial units ?
  5. N3DT

    N3DT Ham Member QRZ Page

    Looks like it's about $220 and comes from China unless you want to buy the Discovery card from Digi-Key for about $60 and put it together yourself, but then it's still $145 so might as well buy a built one. Interesting project, looks nicely made.
  6. AB6RF

    AB6RF Ham Member QRZ Page

    I went with the home-brew route. Bought a STM32 Discovery board, and the RF board directly from EU1KY, then put it together, programmed the Discovery board and calibrated the unit.
    It works very well up to the 2m band, and provides useful info even at 440.
    Amazing functionality and performance at that price.
    KK4CUL likes this.
  7. PD5DJ

    PD5DJ Ham Member QRZ Page

    Hi all

    Excellent project, I have built several of them lately, they work great!
    If you pay lots of attention to the coax+core you can get good results up to 600mhz (compared to other analyzers I have)

    Link to my website of the project:

    Here some links (unfortunaly in dutch but google translated) of some mods I did

    Charging Mod:

    Adding Bluetooth module:
  8. KD2GYO

    KD2GYO Ham Member QRZ Page

    I just saw this project - looks fantastic and a great build price for that functionality.

    Am part way through the W8TEE/K2ZIA analyzer - so will finish that first and then build this EU1KY one.

    Thanks for posting all the details here!
  9. AB6RF

    AB6RF Ham Member QRZ Page

    If anyone wants to put together their own analyzer, I have one spare unused EU1KY RF board.
    It's a direct plugin to the STM Discovery board, and the binary code (no need to compile, just download once to the Discovery board) is available for free on-line.

    I could sell it for $50 shipped. (in USA)
  10. KD2GYO

    KD2GYO Ham Member QRZ Page

    Finished up the analyzer tonight - what an incredible piece of kit! Works amazingly. Snapshots below of a 40m/80m dipole I made last year. (the average/bad SWR on 80m is I think due to proximity of building and trees at either end - and I also haven't trimmed or tweaked it either)

    Very excited to have this analyzer now - and just need to figure an enclosure.

    Only issue I had was it wouldn't boot with a formatted 64GB micro SD card, so I stuck a 32GB one that I think already had a couple files on it - and the analyzer booted great. (I was getting a CFG Flush Err 13 response with the 64GB one - couldn't find any info on that at all)

    Thank you all the people that created this awesome design/project!






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