These units from?newdiytech.com look exactly identical to the one I bought from AliExpress. it was DOA. Contacted the seller and after much wrangling he sent me another one. The second one will tune sometimes, and sometimes not. I have not heard of anyone buying one of the Chinese built ATU-10s and getting a rock solid unit.

73,
Scott
AK5SD

This was addressed recently.? Check?/g/ATU100/message/1485

Al, K2ZN

Have seen lots of ?online reviews, but, have not discovered ?the range of ?antenna impedance, it can ?match

I just came across this thread. I have the same question but maybe I am a bit late. I purchased from newdiytech.com back on June 26th. Based on tracking I hope to have it in a few days. Price was $120.24 shipped to me in GA USA. I felt confident with the vendor due to their endorsement from DL2MAN to supply the (tr)uSDX.

Joshua

Hello

First off, let me state that I'm an analog/RF guy with essentially zero SW experience - enough to pass the exams decades ago, then promptly forgotten.

That said, I'm not afraid to tinker with a few lines of code to obtain a certain result.? Has anyone created source code that's compatible with MPLAB?? Like others here, I can't justify the cost of the Mikroe development tools.? I'd just need a bit of assistance with getting things to compile & build.

Here's my issue: I bought an assembled ATU-10 that generally refuses to give me a usable SWR after tuning - something that appears to be a common complaint.? For comparison, the ATU-10 is unusable with any of the loads that I can successfully tune with my ATU-100.? However, I am?able to tune these loads if I use the test SW to manually tune the ATU-10.? At this point, I don't know if I have a defective PIC, the code has a bug that prevents auto-tune success, or if stray RF is getting into the mix.

Even if no one has an MPLAB-compatible source package, would someone be able to create a package that slows down the tune process so I can get a better look at what's going one?? Something like 500 msec per tune step would be great.? I plan to have a 6 dB pad between the TX and tuner, so extended exposure to high VSWR isn't an issue for the radio.

Thanks for reading

73 - Al, K2ZN

Hello!

As I hope to get the HV capacitors soon - I've tidied .

After several runs of , - I choose the following set of tuning capacitors and inductors:

• 5pF, 10pF, 20pF, 40pF, 80pF, 160pF, 320pF (several values are obtained by combining the smaller capacitances)
• 0,05?H, 0,1?H, 0,2?H, 0,4?H, 0,8?H, 1,6?H, 3,2?H

With this set of reactances the ATU-10 should tune no worse than . On lower bands one will need a balun/transformer to use with difficult (short) antennas.

I hope that the problems some ATU-10 users experience with it's inadequate performance are due to the improper choice of the reactances in the original project. But my attempts to enhance the optimum-finding algorithm (in the firmware) will continue.

Warm regards,
Tony

开云体育

Hi, I am new to the group.?
I have just received the kit.
Any suggestions before starting assemblying ??
Just for the assemby, I have heard of working issues.?

开云体育

3.7 volts will keep the microprocessor alive, but recommend 6 volts or more to operate the relays.
If you plan to use battery backup along with external 12-15 Volt external power,?
include a blocking diode to protect the battery from external power.?
?

3.7 Volts will keep the microprocessor alive, but may not be enough to run the relays.?
The ATU-100 specifications say the maximum current draw (while switching relays) is 400 mA.
Current draw running the display, but not switching relays is 40 mA.?
The onboard 78L05 voltage regulator specified minimum voltage is 7 volts.
The regulator's maximum input voltage is 30 Volts, but that may provide too much current to the relays.?
I would not exceed the ATU-100 specified maximum input of 15 vols.? ?
My ATU-100 has no problem operating off of four AA cells = 6 volts.

开云体育

Nick,

Hi all. Just joined group today. I have an ATU-100 and am confused re the power requirement. The info says 10-15 volts dc range but the internal battery is a lithium 3.7 volt. The input on the schematic by N7DDC shows 12volts with a 5 volt regulator
downstream. This seems logical. But-----

How does a 3.7 volt battery allow the unit to work when the supply is quoted as 12 volts?? Nick. VK4YT.

Hi all. Just joined group today. I have an ATU-100 and am confused re the power requirement. The info says 10-15 volts dc range but the internal battery is a lithium 3.7 volt. The input on the schematic by N7DDC shows 12volts with a 5 volt regulator
downstream. This seems logical.

How does a 3.7 volt battery allow the unit to work when the supply is quoted as 12 volts?? Nick. VK4YT.

How about sharing your doubts? It's not that complicated

I too am looking for build instructions. The box came with one page showing the coils and relays and?nothing else!!! Sadly, I am not really a radio engineer, but a Biologist by trade, and though I can solder and trouble shoot an installation, am no good at figuring this stuff out; I am used to "fold tab under slot b, insert tab a", and just got some photos from the vendor that told me nothing really.

I also think a PC board may be missing, looking at the photos.
Does anybody know where I might get step-by-step on the Web? A Google search turned up nothing.
Thanks from Alex W5ALX

Hello!

I'm yet to populate all the HV capacitors, but today I had a chance to power up the AD8361 detectors.
Those were bought at aliexpress so I was not sure if they are genuine|operational. Luckily they are.
I have applied a signal from my NanoVNA-H directly to the input capacitor of each AD8361, the OLED readily displayed the "input power".
The apparent "power level" reacted to the changes in the input signal (I changed the output current of the Si5351 - that capability is in the NanoVNA-H firmware).
The voltages at the FWD and RFL test-pads were also available for inspection.

So far - so good, the PCB seems to be modified correctly.

Looking forward to obtain all the capacitors' line.

Warm regards,
Tony

Ah.. my understanding this cell should be used if all the caps have the same value (pitch = "distance" between each cap). 01: all caps have the same value, 00: their value must be specific individually