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The firmware in the ATU100 (vsn 3.2) uses I2C to drive the lcd/oled display.? I want to modify the code to allow the PIC to communicate with a Raspberry PI to allow pre-set tuning.? I need a I2C

A few years back, I purchased some T37-2 toroids from a random seller on ebay. When I first bought them, I made a series tuned circuit for ~7MHz in series with a 50 ohm resistor. It read significantly

I purchased a couple of AliExpress ATU-100 kits in the past. My first one worked okay, but worked a lot better after updating the diodes. The second one remained unbuilt for a future project. In the

Hello ZAO, If you assume a 50ohm system and max input of 10W (40dBm) and the max input of the AD8361 is 0.4Vrms (5dBm) that implies a coupling ratio and voltage divider attenuation of -35dBm ? What

The issues are caused because the nature of the design.? N7DDC did a great job on this design and made it open source including the code.? There are dozens of small companies selling "their" version

The hex code listed on Git hub is display specific.? I have attached the hex file for Ver 3,2 for QRP using the 0.96" square 4-line display.

I am working on similar project.? Does anyone have the EEPROM code? .? The tuner I am trying to modify has the locked the read function.

Robbie, blonde is the new forgetful! Try https://www.analog.com/en/products/ad8361.html#product-evaluationkit, where AN-691

I'm probably having a blonde moment here but as the?AD8361 is an RF detector for the 100MHz-2GHz range how can it be accurate at the lower HF frequencies? Just curious... Robbie M1ROK

Hello! The PCB is designed to accept SOT-23-6. My point of view - because the capacitors and inductors have only 128 steps (just seven relays, so 2[sup]7[/sup] available values), there is no sense in

The AD8361 is a great part and ideal for this application or as a mWattmeter. Are you testing the SOIC or SOT23 package ? You might have to add a better (more bits) ADC with a I2C interface like the

Hi, I think that it is a very interesting concept and as soon as I can get hold of a PCB I will definitely try that. Vy 73 de Rolf, DL8BAG

Dear Michael, My goal is an attempt to make it possible to tune with as little RF-power as possible. The original project (just as most other SWR-meters and ATUs) employs diodes as RF-detectors. This

Thanks Tony - Forgive my ignorance, how does this improve the system?? I'm learning as I go here.

Dear Michael, I did not change much - there are the same 0603 capacitors and resistors, the board is mostly the same as the original. Only the diodes are replaced with the AD8361 detectors and an

I will try re-winding binocular core.? I thought I was careful to get good connections, but you never know.? I also have some magnet wire that is a bit thicker I can use. Does the phasing between

Or you can go to David's github repo and grab the users manual which is the same thing. Vince. -- Michigan VHF Corporation -- nobucks dot net K8ZW - http://www.hamradio.fun

I agree, the quality is by far not the same as Elecraft or QRP-Labs or Heathkit (used tobe). And I had to buy pcb from one supplyer and housing as well as diplay from another. Vy 73 de Rolf, DL8BAG

Thanks for the help wrote:

Try the internet archive: https://web.archive.org/web/20210121210040/https://radioaficion.com/news/automatic-antenna-tuner-kit/