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Hi Bret, The supply current of the ATU-100 is dominated by the number of relays that are activated and the unit does need to be powered to retain the tuning. Each relay has a coil resistance of

What would be the current draw for the ATU-100 (the firmware V3.2 model with Tune, Auto, Bypass and 4-line screen) in idle? I read that the ATU-100 does not have latching relays so it must be powered

Hi Mike, Very strange about the USB cable. I wonder if it is a mechanical issue or the way the USB-A to USB-C is connected. With respect to the display, maybe revert back to the previous version of

Thank you, Dave and thank you Al. UPDATE: I opened the box and try to check whether the USB connectors pin (i.e. from inside) was reading 5V. I did not. So, before assuming that it got detached from

Hi Mike, I do not have an ATU-10, but looking at the schematic it sounds like the USB power may not be present. This feeds the charging circuit and the PIC associated with the USB interface. The 5V

The unit works fine. It is only the charging and the PC connectivity that (apparently) fail. Is this indeed your experience? I would have guessed that a faulty PIC would result in no operation

Michele I had this same thing happen a while ago. The problem turned out to be poor soldering of the PIC. Fortunately, I have a hot air rework station and was able to fix it. 73 - Al, K2ZN wrote:

I bought a new ATU-10 months ago and I immediately upgraded its firmware to 1.5, ?but did not use the unit since then. I would now like to fully charge the battery as well as to upgrade to 1.6

Thanks a lot Dave for taking the time to share your experience. I can see you want this for QRP use. In my case, I want to work this as a remote ATU in LOW power. I have already bought the right

Hi Anibal, The ATU-100 that I received also had the same diode arrangement to that shown in your picture, one was marked “SA” which is a 1N5711 and should have a similar specification to the

Have you tested the tuner with a dummy load, to see if the power is different the higher you go in frq, It looks like it should be ok with the BAT41, Dave

Hi I had bad power and swr reading in the higher bands Then I fitted the bat 41 in to both D1 and D2 and it is working fine, This is very common with this tuner, it looks that they have fitted cheap

Hello Dave, I just gave a look into the diode type. Waht I can see is they are both completely different one from another. What I have seen before when it comes to swr metters is "to have 2 Germanio

Hi Change D1 and D2 to Bat41 diode's Dave

Thanks a lot Dave for your prompt repply!!! It could be the reason but those are "already mounted" (SMD), right? is there any replacement / retrofir to fix that one? Any action needed from my side?

Hi I think you may have the wrong diodes fitted for the tandem match, Dave

Hi Guys, I have recently bought the kit and built it up. Now I am testing it and this is nicely working from 17m to 160m (it reads SWR and does the matches?accordingly) but this is "doing nothing"

Paul, One device show 1, second one 3, someone is wrong. Put a 50 Ohm load instead of antenna and check if both show 1.

sorry forgot the picture.

Bob, I have an assembled N7DDC ATU-10 PCB here which is available. It is programmed with V1.6 firmware (latest) PCB only as shown, *no battery, case or OLED display.* I think a fair price is around