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The ATU-100 has non-latching relays. It should reset to a pass through configuration when off but I haven’t tested mine. The bypass switch is momentary contact. The display shows when you are in

I readily admit that I'm very much an amateur when it comes to schematics, so forgive me one more question: I notice that if I listen to a band with the ATU-100 in-line but powered off, the RX seems

Excellent, thank you! I'll get in there and see if I can find that pad. In the schematic, is that a toggle switch? I can't find the schematic symbol online... is it saying that I'd switch that pad to

Thank you all for your replies, that's quite easy when you have the solution given to you! 73, Yannig F4IUJ

Hi Joe, I have the button but when I was making it I just soldered a wire to the pad marked RB2. It is close to the processor chip on the side of the board close to the controls. I am pretty sure I

Greetings all. I have a question, about an ATU-100 (pre-built Chinese version... I had to solder on new SO-239s, the ones it came with were horrible): This version of the hardware only has one button

i think it is - press all three buttons together.

There are 256 bytes of EEPROM. You would need to have a frequency counter and make a lookup table. It’s not much room. Colin K6JTH

What would it take to convert the ATU100 to include memory. That way the TX has a better time each time you change bands. Has any one tried this.

Thanks!? That is exactly what I needed! 73 Mark AJ6CU

Mark; It's documented in the pdf file on the N7DDC github https://github.com/Dfinitski/N7DDC-ATU-100-mini-and-extended-boards/tree/master/ATU_100_EXT_board

Howard, That would be great!? I will do some googling and hopefully find the right combination of presses. 73 Mark AJ6CU

Doesn’t the ATU100 have a test position, that cycles through all the combinations where you can hear the relays operating?

Just finished one of those commercial atu-100 kits (bought this one from Amazon). Have problems, will not tune. Would like to eliminate the relays as a possible issue. But this the vendor has locked

Hi, I've just remeasured with the 10T secondary terminated in 50 ohms (as in-circuit) and the loss becomes negligible, less than 0.06dB! See attached update. No need for alternative core, this is

Hi All, I'm sure some of you may have noticed this before, but when you measure the path through one hole of the BN43-202 the loss appears quite substantial on all but the lowest bands as seen in

Yes, a good idea indeed, thanks. Not sure if the ATU-1000 has some built in modifications, the diagram is quite different, the relays uses high side switching for example

There are lots of pins left on the PIC processor, you could add code to output the needed controls to them. Having RC6 and 7 as a tuning status register would be easy. Set RC6 to high when tuning. Set

Hi all, I would like to embbed an ATU-1000 inside my amplifier. For a smooth operation I would need to switch modes (auto/manual) and read status information (mode/power/swr) programatically. The

Here is how it can be done: https://rde-posten.dk/onewebmedia/OLE-ATU.pdf 73 de niels, Niels