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Re: ATU-10 kit or build - newdiytech.com website

 

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 better than 1.3.
But efficient is still 85% , very close to simple 14:2 wiring.
K5NL method is not working at all, I tried many times. Ugly SWR, no inductance compensation.?
Re: ATU-10 kit or build - newdiytech.com website

 

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 try 21:3 autotransformer (tap on 3rd turn) see the note in top right corner.
Re: Period is not displaying properly on v1.6 Firmware #ATU-10

 

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No problem with my ATU-10.? loaded via a pc.

Vk3pe



Sent from my Samsung Galaxy S7 smartphone.


-------- Original message --------
From: Joshua Ellis <jjellis2010@...>
Date: 26/5/23 3:46 am (GMT+10:00)
Subject: Re: [ATU100] Period is not displaying properly on v1.6 Firmware #ATU-10

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
Re: Period is not displaying properly on v1.6 Firmware #ATU-10

 
Edited

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 terminal and used that file. ?It works fine....
Re: Period is not displaying properly on v1.6 Firmware #ATU-10

 

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
Re: Period is not displaying properly on v1.6 Firmware #ATU-10

 

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

73 Stephan
Re: ATU-10 kit or build - newdiytech.com website

 

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 2.8W out
3.6MHz - 9W in 2.9W out; 5W in 2.4W out

Calculations of efficient for each core:
14MHz 9W 81%; 5W 84%
? 7MHz 9W 77%; 5W 77%
3.6MHz 9W 57%; 5W 70%
Re: Period is not displaying properly on v1.6 Firmware #ATU-10

 

Hi.
I have loaded 1.6 firmware from?
right now just for test
Re: Period is not displaying properly on v1.6 Firmware #ATU-10

 

Is anyone else seeing this behavior? ?
Re: ATU-10 kit or build - newdiytech.com website

 

David one more point, you still have a very long connection leads. Don't change anything just shorten them to 10-15mm and you will see how the plots will change. I found that to measure losses accurately I had to shorten all leads to <15mm, I was surprised how much influence they have on results.

GL 73 Marek
Re: ATU-10 kit or build - newdiytech.com website

 

Hi David,

Classic 14:2 turns on FT140-43 has low efficiency. I had difficulty in passing 70% mark. I would recommend 21:3 turns. Also arrangements of the wires has impact on performance and compensation of capacitance. You might try to spread last 3rd of the turns
Period is not displaying properly on v1.6 Firmware #ATU-10

 
Edited



As you can see from the images the the "." period character is displaying as a block character on v1.6 firmware when I reinstall 1.5 it is displaying as expected. Maybe someone put a unicode version of a period instead of a ASCII version...


Below is after I reinstalled v1.5
Re: ATU-10 kit or build - newdiytech.com website

 

And classic winding 2t + 14t ,?2950 resistor, 100p capacitor
Re: ATU-10 kit or build - newdiytech.com website

 

Hi Marek, VA3RR
I tried a variable resistor and found that it is technically works with 2.1k resistance.
Looks like a capacitance still not compensated fully.
Re: ATU-10 kit or build - newdiytech.com website

 

Marek's method of measurement is consistent with that suggested by Owen Duffy.

On Tue, May 23, 2023 at 07:08 AM, Marek SP9TKW wrote:
Here is one of my transformers (FT82A-43) as comparison and to show how I
measure SWR (yellow) and losses-S21 (blue).? S21 shows total losses but if
you calculate 10*log((R+50)/50) and subtract from measured values you will get
your transformer losses/efficiency. R is resistance in ohms of your test
resistor.
Re: ATU-10 kit or build - newdiytech.com website

 

Hi David,

Except longer leads I don't see issues. I assume that these are #43 cores you are using and nanoVNA is calibrated.

Personally I don't wrap them with tape as it limits heat dissipation = lowers power handling capability.

Here is one of my transformers (FT82A-43) as comparison and to show how I measure SWR (yellow) and losses-S21 (blue).? S21 shows total losses but if you calculate 10*log((R+50)/50) and subtract from measured values you will get your transformer losses/efficiency. R is resistance in ohms of your test resistor.?



I hope that this will help you in trouble shooting.?

73 Marek
Re: ATU-10 kit or build - newdiytech.com website

 

Hi, people
I have tryed KN5L unun and it does not work
Re: ATU-100 not working / matching in "High Bands"

 

Hi Dave, indeed, it was mainly an antenna issue, all is fine!!! Thanks for your help.


El mié, 17 de may. de 2023 15:42, Dave (G8PTN) <g8ptn@...> escribió:
Hi Anibal,
Are the results with a 50 Ohm dummy load or into your antenna?
If you are using the antenna, what is its impedance and SWR without the tuner on the higher bands?
Based on the components in the bias-tee video, it should have a good response, so I do not expect this to be the issue.
73, Dave
?
Re: ATU-100 not working / matching in "High Bands"

 

Hi Anibal,
Are the results with a 50 Ohm dummy load or into your antenna?
If you are using the antenna, what is its impedance and SWR without the tuner on the higher bands?
Based on the components in the bias-tee video, it should have a good response, so I do not expect this to be the issue.
73, Dave
?
Re: ATU-100 not working / matching in "High Bands"

 

Hi Guys, I have replaced the diodes with reference BAT41 and now I can handle up to 15m band, it does not go further (12,10m)
Attached you will see the diodes I have used.

Any additional?tip / advice?

On the other?hand, I have deployed a Bias-Tee so it can work as a remote tunner, pictures are also?attached.
NOTE: for the Bias-Tee details please look into this video, thanks to EA3GRN.

?


El jue, 20 abr 2023 a las 22:58, Anibal Dos Ramos via (<anibaldosramos=[email protected]>) escribió:
Hello Dave, I just gave a look into the diode type. Waht I can see is they are both completely different one from another.
What I have seen before when it comes to swr metters is "to have 2 Germanio diodes", one for the forward and other for the reflected. I will buy the one you mentioned and I will replace them.
Thanks a lot!



El jue, 20 de abr. de 2023 14:49, davebb123456 <davidbrowne76@...> escribió:
Hi?
Change D1 and D2 to Bat41 diode's
Dave

On Thu, 20 Apr 2023, 13:44 , <anibaldosramos@...> wrote:
Thanks a lot Dave for your prompt repply!!!
It could be the reason but those are "already mounted" (SMD), right? is there any replacement / retrofir to fix that one?

Any action needed from my side?
What are the right ones?

Thanks!

Anibal
DM5MT

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