ATU 100 EXT -Budget Tuner Modification to QRP and Autotune -(NO HARDWARE CHANGE)helped by MW0SAW 

Thank you. Used my Pickit 2 and followed your instructions and my ATU100 now works with my IC-705.

Thanks, I have two of these also and will make the changes to one of them. Thanks again.

So I'm assuming that the issue with my ATU-100-0A showing TUNE, but not activating the relays/not tuning is due to the power required without this program change?? Was thinking it was just defective since my other ATU-100 EXT came out the box working great.

@ 1:22 in the video he's saying add one pin here... I can't tell where "here" is from this video... Is that just to ground? or something else?

So can I use a Picket 2 vs 3 (assuming yes but asking since I'm not 100% sure)?

Been there,works fine for qrp adjustments....had me foxed for hours,suddenly didn't work..had the connection one pin off!!

Hi, thanks for this tutorial! I have just tried to do this with my Pickit 3, almost succeeded. At the point when I read the device, I get only the first byte, the rest is just zeros, how come? Is it really working without hardware mod ? The video in your description says it will only work with the hardware mod he describes.

Hi how do you reduce from 10 to 5 turns.?

Will other programmers also work?

Thanks, this was most helpful!! And really made my ATU-10-0A a much, much nice unit!

Thanks for the video, Did you change the ratio of the transformer from 10 to 5 turns like the Italian OM ?

Great, worked fine with my pickit2 as well and now can tune my 705 with this. Thanks for the video.

When i connect my pickit 3 every thing loads, says it's connected to the device, but when I read my device, everything is zeros. Does the atu 100 power need to be on?

Is it still good for 100w after you do the mod?

Just what I needed ! Thank you !

Cool qrp hack.

Hello.If i do the mod can i use it with my usdx transceiver? 73s de SY1DUG

So now the Pickit2" arrived. But with it my first problems: sudo ./pk2cmd -B./ -I -P says: "Auto-Detect: No known part found." So it does not tell my which PIC chip is inside. If I select a PIC16F54, PIC16F57 or PIC16F59 because these are the only ones which I can select with the PICKIT2 Software in window$ without getting errors directly there seems to be some communication. But reading the ATU-100 chip does not work at all. Normally in the PICKIT2 software under "source" the ATU-100 should be found and the chip content be read but that does not work and I do not know why. Though it tries reading, the Busy LED is flashing but the hex code is only 0000 or FFFF. Nothing else. So I assume either my model is not the model it should be, or it has any kind of defect or the pickit2 is not able to communicate with the ATU-100. On the supported devices list the PIC16F1938 is mentioned though. And this is the chip in my ATU-100. The Pickit self check went ok. So there seems to be no obvious problem. (???)