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Hi, I have ATU-10 which works OK.? However my TRX is able to output 15-20W depending on band. What are the risks of pushing slightly higher power through ATU-10. What changes I would need to make to be able to do this. ATU-100 is fine by bulky and heavy. ATU-10 is just right for what I need it for ie SOTA activation.

73 Marek

Is there a non-Chinese source?

72 de Bryan, k0emt

Hello!

What I mean by the "T-type differential capacitor ATU" is the .
Yes, even with 256 steps of variable capacitance and inductance - provided we make the 8*8 relay matrix - it is still not the same as truely smooth adjustments of the AT2KD's, - but I think it is worth a try. In such a T-type the capacitance is reasonably small (13pF~430pF), and the inductor is not too huge, - within 25?H.

As I can imaging, - the optimum finding with the T-type-differential configuration should be much more straightforward, - first you seek the SWR minimum with the coil, then - with the capacitor.
The required PCB alteration is almost negligible and will simplify the layout.

What do you think?

Warm regards,
Tony

Tony
These are the pins I used.

Glenn
vk3pe

On my kit I simply followed the silk screen. Start with the shortest components as a general rule.?

Colin - K6JTH?

Dear Glenn,

Yes, as soon as I noticed that there are two spare pins left on the PIC16F18877 located exactly where they could be used to control the relays, - I got an idea to try an 8*8.
Most probably I'll do this - on the original PCB with AD8361 capability, looks not so difficult.

Another promising option to enhance ATU-10 is to make it a T-type high-pass circuit - with a "differential" step capacitor. All the unused capacitors on one side of the inductance to be switched to the other side. Really easy PCB alteration required. There will be no need in LC/CL switching, that relay could be used as the eighth stage of the C-matrix. So, with today's fifteen relays it would be possible to obtain 8C*7L matrix. gives really . With one more relay crammed in - in the L row - the T-type would be 8*8.
I saw an ATU with just two knobs - one for the vary-cap, the other for the vary-ind, forgot its' brand name.

I'm really set and dedicated to extract the very best from this ATU-10 project.

Warm regards,
Tony

Tony

I actually designed a PCB for the 8x8 format on the ATU-10 board. Based on the 7x7 of course.

I never had any actually made though, as David said that he doesn't support that format.?? Perhaps somebody who is developing code for the ATU-10 might add in an option for 8 x 8 at some point.

Glenn
vk3pe

Has anyone seen the ATU-500 version of this ATU?

I searched this group fir “atu500” and got no hits. This model is now offered on both eBay and Amazon.

73,

Frank
K4FMH

Dear Joshua,

As of today the only thing left to do here (for me) - is to get the proper values of HV-capacitors. I finally got the aliexpress contact that is ready to sell the 250Volts 0805 caps with the values I prefer. Hope to get a hold of them in ~two~three weeks. Then I will be able to tell - doing the field test - what's wrong with the original ATU-10 v1.4, - the algo or its' non-following the powers of two in the reactances. Also I'm eager to try the AD8361 TruPWR detectors instead of diode RF-rectifiers.

Regards,
Tony

I believe my use for this ATU matches quite well with you Tony.

Is there any reason to not simply swap out the capacitors and inductors to be closer to say the Elecraft T1 C and L values if the matching ability then works better for the user's specific purpose?

Very nice job on this David, what a great concept this ATU is with its feature set.? I may have to give the manual mode a try with a few of the test that failed to provide a lower SWR. Do you recommend adjusting L or C first? I can imagine how to do this but will have to play with the manual mode Firmware a bit more to understand how it work. Assuming it starts each L and C network in bypass then steps through but not sure if there is an easy way to "reset" each to start the manual matching process over again. Although it sounds like an updated algorithm is maybe all that is needed.

Joshua
KO4AWH

See attachment.

This is the Developers web site with a clean schematic:


https://www.ur4unr.com/2021/10/15/atu-1-5kw-n7ddc-mode-by-eu2av/

Thank you for the tip. Looks like FoxIT is not free, Might try the trial software to see if that works.

Any chance you can send me your off-line?

Dear Lou,

You may try Foxit Software's PDF Editor to do this.
I did, - the schematic looks MUCH better now.

(I do not publish it because my PCB is constructed for somehow altered circuitry)

Warm regards,
Tony

Hello!

I tried to add a static capacitance that would be there in parallels with the seven tunable capacitors.
Alas, it works only at one chosen band. The other bands suffer from significant degradation...

The only option is to make the switching matrix larger, - 8*8 or more.

Looks like a user should choose where he wants ATU to operate, - and adapt the reactances accordingly.

As for me, - I'm planning to use ATU-10 on outdoors hikes where I will be able to use simple antennas on 14MHz band. All lower bands are closed for me - because of the antenna size. And while at home - I blocked off the air by huge level of industrial noise.
:(

Warm regards,
Tony

Any way of getting the schematic without the watermarks on it to ease readability?

Dear David,

Your point that ATUs are most valuable at lower frequencies is perfectly valid. I do not object to that.
I'll try (ASAP) to run the analyser script with slightly different set of the capacitances - to check if it is possible to optimise the performance at the lower end not compromising the performance at the higher end.

Regarding the algorithm, - my opinion is that those gaps and holes "confuse" the otherwise workable algo. The fact that a manual tuning allows to find a better combinations is solely to the obvious superiority of human brain to that tiny PIC's.

BRB with the analyser's plots.

Warm regards,
Tony

Chinese. The OLED does not even light up. I have a larger 1602 and it lights up, but no characters. I checked the SDA and SCL lines with a scope. Nothing. No wiggles. I checked the voltages and they are good at the chip. I suspect it was never programmed. I am checking that next.