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Hello, David; I have an uSDX+ V2 ver 1.5 / ATU-10 QRP setup Where can I find explicit and detailed step by step instructions on how to backup and then upgrade the software and firmware?

Hi, Roman It is here https://github.com/Dfinitski/N7DDC-ATU-100-mini-and-extended-boards/tree/master/ATU_100_mini_board

Dear All, Good evening. I have a PCB for the older version of the ATU-100 based on 10 relays, the question is whether the latest firmware will work with my PCB? I am planning to install this ATU

Hello, I'm trying to assamble my ATU-100 kit, but the ATU wont match any antenna. I tried to rewind the tandem coils. I also changed from?enameled wire to isolated wire. Still the same. The SWR

Hello Alex, For sure! This would require working in 3 directions: 1) Redo the SWR bridge under LF, which is straightforward - a good starting point might be

Hello, I wonder if it will be possible to modify tuner to support LF (Low Frequency) Coil Antenna that operates in 100 kHz - 140 kHz band. Alex.

> I wonder if somebody tried to adjust this design to support LF (Low Frequency) bands, like 125 kHz or 136 kHz. Cheers, Alex

Hi, Bill. Your Long Wire 87' antenna works as a non resonant antenna, not like a Half Wave End Feed antenna and require to use 1:9 Unun (not a 1:49). http://vk6ysf.com/unun_9-1.htm Also. you can use a

You should be able to use some antenna tuners to match an EFHW - *especially *if you do use a 49:1 UNUN (AKA RF Transformer) . I hooked up my recently purchased (from Amazon) ATU-100 EXT to my

Hi, Marek Did you hear about magnetic saturation and hysteresis loop ? Their effect can only be verified with a high current test. That is the reason why I can't accept any low signal tests .

Hi David, I am sorry, but I beg to differ. Both transformers are not identical but have the same 49:1 ratio. One has parallel primary winding second has twisted wires method. This alone will have

Hi, Marek. Yes, they're identical. I have tried 21:3 yesterday and found that 20:3 has even better flat SWR. It is suitable for 1.8 - 21 MHz, not for 28, but in that range it works perfectly with SWR

Hi David, 2 identical? I don't think so. Different wires, different construction details which all have impact on losses/efficiency and bandwidth. This is why method is not recommended. As I said

No problem with my ATU-10.? loaded via a pc.Vk3peSent from my Samsung Galaxy S7 smartphone.

That was the issue.... ? When you download a file on OSX it unzips automatically and may be changing something. ?I manually downloaded the zip again (4th time) and unzipped it with unzip in the

I had similar issue after loading firmware from a Mac computer. Switched to a different machine, a. Windows machine, and it was resolved. Joshua N5FY

No, my period looks good with firmware v1.6. 73 Stephan

Hi, Marek I have connected 2 identical transformer in series like that And I got this data: 28MHz - 9W in 5.8W out; 5W in 3.5W out 14MHz - 9W in 6W out; 5W in 3.2W out 7MHz - 9W in 5.2W out; 5W in

Hi. I have loaded 1.6 firmware from https://github.com/Dfinitski/ATU-10-10W-QRP-antenna-tuner/blob/main/Firmware/ATU-10_FW_16.zip right now just for test

Is anyone else seeing this behavior?