ATU 100 Antenna Tuner build details, tests, options, and matching capacity

ATU-100 N7DDC automatic antenna tuner design and build details, tests, options, and matching capacity explained. Chapters below:
00:00 - Summary
00:53 - Intro
01:28 - Details of the video contents
02:20 - Inside the antenna tuner unit
04:30 - N7DDC circuit
04:50 - Inductances construction details
08:35 - Simple NanoVNA adapter for measuring inductances
09:46 - Kit build slide show
10:54 - Live testing the tuner with the FT-857D
19:06 - Power-On button combos for testing or manual use
23:00 - Purchasing options
24:16 - Remote Tuner option using Bias-Tee
24:58 - Matching coverage by bands (Smith charts)

► If you have any questions or comments please leave them below

[rwbuk]

Could you show where the optional bypass and auto buttons are connected please?

[marklowe]

The person who designed this atu has helped so many people. Excellent video, thank you.

[JReed]

Finally got mine built and working! Watched this video when you first put it out, watching it again to remember how it works. Thanks!

[That_Adams_Guy]

Really well done video. Thanks for taking the time to explain and demo the capabilities!

[TomSPTL]

Finally I've found one good video that explains how the auto tuning works here. Thank you!

[civillini]

Pablo, grazie e complimenti ottimo tutorial bravo.

[paulswarman]

A very good video, some EXCELLENT tips in it Pablo and just the right speed for me. Many thanks for your fine work. Paul, G0odp

[ainhoasamford]

Se complican la vida cuando se tiene que hacer bobinas al aire, si in destornillador, si una clavija, etc, usar siempre brocas son muchísimas más exactas

[kkdas]

Nice video - very helpful - particularly for winding the toroids. I've had mine on the shelf for a year and am going to build it in the next few days. Can you post a link to the enclosure you used? Thank you - Dean, KK4DAS

[witektaaham]

Hello friend, I have a question about measuring coils for this Antenna Tuner.
Do these two 100 Ohms resistors need to be connected in parallel to the nanoVNA output or should they be connected in series with the measured coil?
I'm asking because it's not visible in your video and my English is not very good and I didn't understand what you said about how to connect these resistors.🤝 es Happy New Year 2024 de SP5TAA.

[paul.alarner]

mine is built but resets on every keyup, is this normal?. 73

[inthevanagain]

Great job, just one question, how did you create the matching coverage by band Smith charts?
De Kevin - M0KHZ

[Ειρηνη.ΣοφιαΕλευθερίου]

Good morning my friend could the tuner to tune the driver of a linear with tube .SV8MRX 73

[heinzbuff]

Great video thank you ... I would like to ask you where did you solder the wires for the Bypass- and Auto Buttons on the PCB ? Thank you.

[sergiomansilla]

excelente video pablo ¡¡¡¡¡¡¡ mas videos en español ¡¡¡¡¡¡ un gran abrazo, 73'' lu4hms

[vreijs]

Thanks for this great video. Well done and very helpful. When I press TUNE while powering up, I get the option to set Fider Loss (in steps of 0.1dB). Do you know what Fider Loss is?

[horaciodos]

Hello. As far as I understand from your video, the only way to tune is by TX. There is no way to tune for RX. ¿Is that correct? Thank you for taking the time to make this video.!

[rakhmatvaris]

sorry I'm a beginner. can this "ATU_100_ext_board" be used with Doublet Antenna? eg G5RV antennas

[elesjuan]

Hey I don't suppose you can give me any advice on building one of these? Bought a kit off ebay (oops.) and started building it. After about 2 hours, I finally managed to get the tandem transformer built and installed on the board. It wasn't pretty... so got out my DVM and tried to check and make sure nothing was touching that shouldn't, and I'm really confused. All 8 solder points on the board for that transformer has continuity between them. Then I check the input port, and the two pads (center conductor and ground) have continuity with one ohm of resistance. This can't possibly be right???

[tigullio]

Hi, given your availability, I would like to have a copy of the text that you see from 19 '07' 'onwards. Many thanks from IK1CFJ, Biagio.