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Well, I just put blinders on and followed what everyone else said to do for the QRP mods. I wanted 50 instead of 40 watts. So, I pulled 3 wraps off the transformer (for 7). I programmed the firmware

Stuart, if you wanna use 5 Watts or less for tune you have to make some changes, known as QRP mode. In any other cases use stock values . Will work fine for 20-40-50 Watts.

HI, thanks for the reply. I understand the power less than 100w. I'm going to run this with my (tr)uSDX and my Chinese USDX/USDR, and my Xiegu G90. I was really just asking for the basis of the turns

Stuart, you can use 100W tuner with 50W power with no any changes. But if you want to set a tandem ratio to 7 you must change also appropriate cells also because it is the base of correct power

Old topic, but I need the guidance. I'd like to see the algorithm or the spreadsheet. 40w is just a littlte too low for me I'd like to mod the ATU-100 for 50w. If I change to 7 turns on the tandem

thank you! i'm sure its working now. i was worried i got a less-than-perfect-clone of your design, but as near as i can tell it is bang on. i lowered minimum power to tune to 0.2W and turned AutoTune

Ok, keep us posted

i just realized i can upload an old version of firmware to see the splash screen change. it does. when i put my modified version on, it changes back. i am sure everythign is ok & no need to irritate

Even thanks so much !!!!!!!!!!!!

From Amazon: ------------------- Product Description ------------------- ATU-10 QRP Input power: *Minimum 1W, Maximum 15W* Size：100*75*26 mm（L*W*H）,Weight: 300g Package Included: -1 x

I think there is a minimal power to get the ATU-10 running? but I dont know what that is. For example, will my FX-4CR running at 5 watts power the ATU-10 for tuning? or do I have to buy an Elecraft

Thanks Nikita. I can't see any red glow in any seam. But when I turned it on battery was full. So I guess I'm good.

Thanks! I was thinking of building a small 9:1 unun myself and using a random wire.

It won't charge on a "smart" charger. Plug it in a simple USB port. You can see the inside led glowing through the seems when charging.

The electaft ax1 and a k6ark efrw. The efrw has a shorter wire for up to 40m and a longer wire for up to 80m. I use the 80 on camping trips during contests that run over night.

There is an LED on the inside of the case. ;) Of course, the battery indicator on the display will go up as it charges. 73, Scott AK5SD

On the little ATU-10, is there a light or anything to let me know when it is charging? Just plugged mine in and I see nothing to let me know. Thanks. R

Hello! What antenna are y'all using in the field with the ATU -10? I'd like to be active on 10-40, but 60-80 would be great too, even if not that efficiently. I have 2 poles, a Sotabeams tactical

David thanks!

Hi, Robert The max watts are about 15. 5 Watts are the best for tune . A power from trx goes to in connector and comes out from out.