ATU-1000, 1KW Automatic Antenna tuner


As I have succesfully built the ATU-100 kit, I decided to go for a beafier ATU kit.

Some weeks ago I received a kit from Ali Express.

The ATU-1000 Automatic Antenna tuner kit.

It is based on the same design of N7DCC, but the board is designed by EU2AV.
The same firware is used as the ATU-10/100 firmware. but configured in EEPROM to match the ATU-1000 specifications.

All parts are inside the kit to fully build the tuner.

Nowhere on the internet were some building instructions easy to find. Fortunately, the kit came with a document with some directions on how to wind the coils.
I thought this was useful info, and something to share with you.

I was a bit sceptical about the genuinity of the T200 cores, but I have tested them compared to original Amidon T200 cores I have had lying arround.
And to my surprise there where genuine 🙂

Assembly was easy as all SMD and PIC Microcontroller where already soldered.

The only thing needed to do was soldering in all the relays and inductors.

I had already decided not to use the small OLED display. A large tuner needs a decent larger display 🙂

So I decided to use a 2×16 LCD.


I had a nice case lying around, really perfect for this tuner. so this is done and the tuner is placed in this housing.

I just had to put the controller board somewhere else.I made new board connector cabling so I could place it next to the tuner board.

Not entirely unimportant was the design of the front.
Drawn in Corel Draw, and printed with a laser printer on special aluminum foil. and this foil sticked again on 2 layers of PVC adhesive foil. this is to make the foil as a whole a lot more rigid.
Furthermore, the print is finished with 5 layers of acrylic spray paint.


Things to do:

Improve SWR Bridge, sometimes it doesn’t measure the right SWR, especially with completely non-resonant antenna systems, it can sometimes indicate that the SWR is well matched. But in use, the SWR is still high.

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28 Responses

  1. F6EHJ says:

    That’s very interesting because I am facing some difficulties with this auto tuner…
    First of all, the bypass relais is always actuated and the RB1 grouding has only effect on the display (_) but the relay stays in the same position.
    Finally, I have remove the 2N7002 which command this line.
    Tests are in progress…

  2. Matze says:

    I have the same Tuner.
    Is there any changes for usind a 2×16 LCD?
    My extra LCD shows no numbers or letters. Only light
    73 Matze DO4OD

  3. martinn says:

    Hello pd5d
    whats the version of FW you are using ? I am facing some problems with tunning.
    Can you send me also your hex to compare ?

    73 de OE9SAU

  4. pd5dj says:

    I finally had some time to retrieve the firmware + eeprom settings from my unit.
    You can download it here:

    Right Click Save as

    • Franta says:

      hello, I downloaded your file but it doesn’t work for me, I have a pic 16F1938 and a 1602 LCD, do you know where the error could be? The older one works thanks Franta 73 OK2W

  5. Roberto says:

    Hello, I wanted to know if the 6 Toroids are T200 Amidon or T68-2 ? Thank you

  6. Axel says:

    Hi !
    Do you have a picture of bottom PCB ??

    i have buil the same unit, but i think that the capacitor presoldered onboard are not as the schema..

    the scheme report 10p,22p,40p,82p,160p,320p,640p
    but my measure on soldered capacitors report : 30p,100p,160p,330p,750p,1650,3500p

    Can you measure yours capacitor for me ?
    Tnx !

  7. Fred Wagner says:

    Hi pd5dj, can you offer me your Atu 1000W case ? Or were can i buy it ?
    Your case looks perfectly and very good!

    dk9wf, Fred

  8. Manfred says:

    GREAT, there is almost no information about the ATU-1000.
    – well I also got one from Aliexpress, – UNFORTUNATELY the PIC is EMPTY – all 00000, ((everything is readable in the ATU100, I need the soft, where do you get it.))
    PIC16F1938 and 0.96″ display (4 lines).
    by 73! DL2AMM Manfred

  9. Manfred says:

    After switching on the voltage, all relays switch briefly, then Rel 2 on, no reaction to the tuning button or the others.
    Code-Protect, m .. but if nothing responds..
    vy 73 Manfred

  10. Manfred says:

    oo TNX Version 2.7 ok

  11. Manfred says:

    –m strange, programming works -reading too
    0000 31A8 2D3B 3FFF 0029 083A 3A00 1903 2821
    0008 0021 170D 3006 00FD 0BFD 280C 0000 178D …
    but the display is off and no button works..

  12. Manfred says:

    I don’t have any more advice, can the PIC be defective, unfortunately I can’t write a test program for it, or can I exchange the PIC?
    The display shows GND .5V: CLK + DAT with a square-wave signal of 5V intermittently, the buttons do not react,
    after switching on, all relays go on briefly, then only one R2. (blue LEDs)
    see only one possibility _ change PIS…???

  13. Paul G4HDS says:

    Hi Manfred,
    Don’t panic. Theres been a few of those Oled boards faulty, including mine. It sounds as if your board is “booting up” as the relays are resetting to default.
    First check, is the Code set for Oled or LCD display ! I think from memory the code at that link was for a LCD display….at this point in time the buttons won’t actually do much…..infact the only reaction to pressing the buttons at present will be to change the display to indicate the mode its in… and as your display isn’t working…. if your able to program the Chip, and get a good verification from your programmer, I’d think the Pic is probably ok…AND of course the programmer uses the same plug and data lines as the display does. Try a standard LCD display with a serial to parallel interface …don’t forget to set the correct eprom settings fir the dispkay

    Regards Paul

  14. Manfred says:

    Thank you for your patience,
    the OLEDs are ok, I tested them with an ATU-100, I always look closely at the connections.
    With the programming switch there is always a relay at the beginning and end, the current goes from approx. 50 mA to approx. 0 – and then to 50mA, on the PIC board it is approx. 10mA.
    I’m at a loss.
    vy 73 Manfred

  15. Manfred says:

    .. ps. code all testet 7E,78,7A,4E

  16. Paul G4HDS says:

    Hmm, interesting!
    As a test how about copying the code from your working atu-100 and trying the board with that code ? That should prove conclusively if your control pcb for the ATU-1000 is at fault.. it just means for now all the eprom settings etc are for a 100 watt atu. If the pic is faulty they only cost a couple of Dollar’s to replace,
    Regards Paul

    • Manfred says:

      HI PAUL!!!
      BUTTON Goes Tune and Reset, the other buttons work too!
      – What do I have to change now for the ATU-1000?
      vy 73 Manfred

  17. Paul G4HDS says:

    Excellent, well done…! Now print out a copy of the eprom contents from the high power atu firmware you downloaded, then compare it to your working eprom code….
    In the original atu-100 documents it explains which “eprom cells” hold the power settings etc etc. Simply copy the appropriate settings from the high power firmware into your working code.

    Have fun Paul

  18. Sloba says:

    Is it possible to use the tuner outside (closer to the antenna) and the control unit inside the house? The connection would be with shielded cables.

  19. ha7vc says:

    I have a problem with the ATU1000 not working in bands above 18 MHz. I was advised to try to update the firmware. Unfortunately I don’t know where on the finished panel the PIC programmer should be connected. Thanks if you can help.

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