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HI all, I'm in need of some advice please, I purchased an ATU 100 from Ali Express, I have had it for about 5 months, on the front, it has 1 green tune/reset button, a red on/off rocker switch and a

Hi, While testing my frequency monitoring changes, I've been using FM (into a dummy load and a lightbulb, to reduce my noise on the air). On 6m/50MHz, it tunes the lightbulb to about 1:1.3 which is

I2C was a pain,? I ended up just sending basic serial out of RB6 and pulling the button lines low with the Arduino to control the tuner. Then RS485 / Modbus back to node red in the shack.. Ian

/g/ATU100/message/2818

Hi, For remote control of the ATU-1000 I am trying communicates through it's I2C bus to grasp all the measurement data. I want to use an Arduino Uno acts as I2C slave and connect it to the

Paul perhaps you can draw and post the Schematic of what you built which might help. Like others here I have not seen or remember seeing one with 4 toroids. Glenn

Looking at the schematics for various commercial tuners, the remote tuners (with a C-L-C Pi network) often include impedance and phase measuring hardware. The first page of the schematics in

Oops. On reviewI see the formulas are really quite simple (once you ignore the complex math). Just a series impedance followed by a parallel impedance or a parallel impedance followed by a series.

Tom, I dont remember, but I did very small changes. I have also different kinds of this for different L and C configuration. Cp-Ls-Cp, Cs-Lp_Cs, Lp-Cs-Lp, Ls-Cp-Ls, T-tuner

I'm currently counting the T1CLK pin for 1ms, then doing a div4, to average it out, this gives 16kHz steps. The frequency to memory lookup takes about 500 clks (so 250us). This is done twice.? If

David Fainitski, Do you happen to remember where you found the original code from Alex?R2AUK. I've been looking all around and so far no luck. I found his github here https://github.com/afiskon/ but

Very cool! ?Very promising results! That sounds like it would be mostly just software at that point then! ?(Though I guess there’s more to do there than I thought, you’d probably want to not

I cross posted some of my results. So I thought I'd post how far I've got. This is the front end signal conditioning, going into a 74AC74 (Schmitt trigger inverter) that is used to clean the signal

I've got the basics working. ?Just doing spice sims to work out some component values. ?Basically the 74AC14 at the front end needs a 1V...4V signal. ?Over the whole frequency range, from

Oooo, the ATU100 has the capability of measuring frequency??? It sounds like it might take significant development work, but adding stored tuning information to make later tuning instant on the same

Just been looking at the tune2.c, and seen the LRU list. While looking at the LDG and MFJ relay patterns I see several repeats, given that the code tracks the best found so far, there seems no point

Hi, I've been looking at adding frequency monitoring to the ATU-100 HW.? I have it mainly working (current front end gain is wrong above about 24MHz), so need to tweak some of the network values to

Chris, my tuning algorithm isn’t too different than the article you referenced, but I think you will find that the tuning algorithm in the article results in a lot more switches to find a solution.

Could be either.? I used the code in tune2.c to replace the tune() routine in the ATU100 3.2 firmware

Is the Github code pointed to for the ATU-100 or ATU-10? Seems to be? a conflict here, nATU-100 in the post and ATU-10 at Github. glenn