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Hi. I would start to check the board for unsoldered relays pins. It looks like one coil is staying non shorted all the time. Second, I would check all the relays are deenergized in reset mode except

Hi, I just received my ATU-100 from Banggood and I did some testing with KX3 and a good dummy load. First I've changed the EEPROM cell 05 to 01 (min power to 1W), and Auto tune to 0. When I TX on

Hi. Unlike some other tuners, this tuner doesn't go to bypass while receiving and staying tuned all the time so it does some receiving improvements.

As many modern auto atu, this tuner does not improve the signsl, on receive, but, protects the pa from high swr, if and whrn used at the transciever end. The ideal position of a tuner is at the

I would like to know if there are some High Quality relays models (ie Omron, Fujitzu ecc) compatible with ATU-100 PCB Thanks, 73 Luca IK2LRN

Hi Jo, The 50 ohms we like to see is not a purely resistive component but the result of capacitance and inductive influences that results in a 50 ohm impedance. Thus if you use a 50 ohm resistor as

Hi, Jo First of all I would check it with 50 Ohm dummy and power 500W to ensure that SWR equal to 1 and power shows correctly. 50W is too small level for sharp measuring.

I have finished building the 1 kW ebay tuner and thought it would be a good idea to calibrate the power and VSWR measurment. So I hooked up a 100 Ohm carbon resistor to the output and with 50 Watts on

I'll just (semi) hi-jack Marek's thread to say that on my ATU-10 with the new firmware 1.5, using a dipole set on 20m, the unit tuned brilliantly on 20m, 30m, 40m, 60m and 80m - the worst SWR being

Marek, using simple multimeter you can check if all the L and C components switch properly. Using VNA you can check if C increase correctly.

Thanks David for suggestion. Do you mean that I should use S21 (losses) measure to see how things change? Can you elaborate a bit on VNA checking? Sorry I am a bit rusty in such details. 73 Marek

Hi, people New firmware on Github https://github.com/Dfinitski/ATU-10-10W-QRP-antenna-tuner/blob/main/Firmware/ATU-10_FW_15.zip I hope your tuners will work better.

Hi, Marek Unfortunately, one wrong RF capacitor or cold soldering of relay's pin is enough to make all the tuner has not worked. You can check everithing with manual mode FW and VNA but it will take a

I am afraid that I still have issues with proper tuning using ATU-10. I have installed latest FW 1.5b BETA and things marginally improved but still no tune below 1.5:1 from 10MHz upwards. I uploaded

Version 1.4 gave some very high SWR (1:3-1:9) tunes on 80m and 20m (TRX IC-705 ANT GPM1500 Vertical). 40m was fine (only tested those 3 bands so far). I was quite worried at first if I got a bad unit,

Dear Luca, I've answered privately. For others - this is what I had to do ( /g/ATU100/message/1407 ) on the original PCB to have the PIC16F1454 programmed with a PICkit-2 clone. Warm

Doh, thanks Scott! Yes, all the previous firmware updates were made using a Windows OS on my server, but for this particular one I used my workstation Mac as I was using it at the time. Just used the

Robbie, I had a similar problem a while back when I copied the firmware to the device using my Mac. When I copied the firmware using a Windows machine, the problem disappeared. 73, Scott AK5SD

Hi David, I'm getting white blocks on the display instead of "PWR = " using 1.5b - see image. They are still there after restarts (no batteries installed yet). Firmware 1.4 was okay. Robbie M1ROK

Joshua Yes, the same algorithm. Other users say it works perfect. Will see.