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Bj?rn While there is no harm in having exact capacitances in the ATU-100, the PIC1938 is measuring only the forward and reflected voltages from the Sontheimer coupler (ie Tandem match) and goes

Hi David, Efficiency depends on style of winding, core dimensions and attention to details when construction the transformer. For example tight winding on the core and short wires at primary side play

The firmware update was very easy and the 1.6 firmware performs better in matching than the 1.5. I have updated 3 ATU-10s to use with TX-500 and IC-705. 73 - Dave, N4ELM

Thank you both for your answers'! I want the algorithms to be as effficient as possible and it should be better to not have negative jumps in the applied capacitances so I will compensate for the

as long as i tunes ok still i dont see that it matters.

Hi Rod, You can download the current firmware from: https://github.com/Dfinitski/ATU-10-10W-QRP-antenna-tuner/blob/main/Firmware/ATU-10_FW_16.zip Plug your ATU-10 USB into your computer (it becomes an

I'm considering adding an ATU-10 to my FT-818 for POTA etc. and those I'm seeing on the various sites are 1.5 firmware versions not 1.6 versions. I've Googled "how to update firmware ATU-10 but

David; For the KN5L transformer (2xFT114-43 toroids), John's work is found at: https://www.kn5l.net/kn5lEfhwUnun/ For the Owen Duffy transformer (2643625002 core), his articles start at:

Hi, Bjorn The values in eeprom are using only for display total connected capacity. So you can write there what you want .

People, how did you find your 90-98% efficiency of 1:49 transformer ? I would like to find it too.

Hello all! I have an ATU-100 where I have had problems with broken SMD caps so now I have replaced them all with 3kV disk caps instead. However when I measure the capacitance between center and ground

Hi Paul, Yes, the female connectors can be a bit of a pain. I tend to just make up a multi-pin connectors as required, and they seem to be a little more reliable. Anyway, is sounds like you are back

Picked mine up from NewDIYTech.com Good build quality. Prefer my T1 but the ATU-10 is great for the price and availability. Not to mention it’s feature set. You can see some of my testing here:

Hi, Stig That model has modified PCB. Could you show us what inside ?

Hi Stephan, I strongly recommend KN5L method, if you are still looking for 6m band make primary connections as short as possible. I tested my repaired ATU-10 with Long Wire antenna in the garden and

Hi Rod. I have purges the AT-15 variant, but this drains the battery twice as fast in OFF, as when it is ON, so stay away from this model. 73 de OZ3XO - Stig.

Any recommendations for best outlets from which to purchase an ATU-10? Any to avoid? If any have had relevant experience with one of these and a FT-818 I'm all ears. Thanks. -- Rod VA3MZD

Well it now has a semi working display,looks like an iffy dupont lead connector,i hate them with a vengance,total crappy idea!.

well i have used an arduino uno with a test sketch,all my oled displays work fine,need to hunt down my programer now,at least i now know the displays are ok,can rf corupt the pic fw on these?.73 m3vuv

Yes, it seems very strange, particularly if it was working before the capacitor problem. Check that the MCLR is not stuck low for some reason. I think you will have to validate the EEPROM