Hello everyone,
I recently completed the eBay 1kw version of the kit and immediately realized the SWR bridge is extremely out of spec. I’ve tried adjust the potentiometers to no avail. The power is reading about 5 times what is actually being produced by the radio. Can anyone suggest a replacement diode that is known to work? Here’s a photo of my completed unit.?

Hi. You have to change some cells according to tandem match ratio.
You can use pick it 3 programmer and software you can find in the pinned messages.
Cells description in the manual at the end.

Thank you, I will keep looking in the group. I’m tempted to remove the chip and start all over from the ground up…but that is probably overkill. I bought the kit off of eBay from china and suspect that the chip is read protected.

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Mike, the existing diodes are 1N5711. I purchased new diodes yesterday from Mouser and they should be here today. I’m suspect of the quality of the ones provided in the kit.?

Elijah, you need to erase the PIC , flash the latest FW with corrected cells.
Many people did this before, nothing special.
I don't know why Chinese s manufacturer closes PIC, that is stupid.

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I did some more reading and ordered a PICKit 3 this morning. I’m going to try and utilize the chip in the board but already have the chip and socket in my cart. I also found a document that describes what values are and what to change in the hex code for different settings. Can someone share the link of the proper code to download though? Here are some more photos of my build. The display I ordered from Etsy with the cover for a cleaner look.?

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Hello Geoff and others. I successfully erased the protected chip and uploaded the new firmware with some corrections. It took me a while and numerous times of trial and error…but it at least turns on. I’m still experiencing an issue with the SWR/power meter being way off even though I updated the hex code EPROM with the turns (20 in my case) for the bridge. On top of that, my display is depicting numbers to the left and items on the bottom that we’re not there before. (See attached photos) How should I remedy both the bridge indication and the display? I’m not frustrated yet, but this is challenging ?.?

power at 10 watts

Power indication at 10 watts

Display woes

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hi Elijah,

for correcting the display, look for the cells 7 and 8 on EEPROM.?
Try setting both to 0 (zero)... that may solve this issue.

73, Immo

Hi.
In a separate topic, I raised the issue of the correct adjustment of RV1 and RV2 on the PCB, but no one has answered yet, and I don't expect anyone to answer either... anyway, I was just asking out of curiosity.

In the original project (ATU100), the author used a fixed divider of 1/3, and the only adjustment element is (depending on the desired maximum power) set by the tandem ratio, a value that is also declared in the corresponding eeprom cell.

In my tuner I used a fixed divider (68K/34K), tandem with a ratio of 1:32. I configured the EEPROM cells according to the manual on github... and that was it!

Success!

Thanks for the input Markus. I’m confused with the input into EPPROM. If I’m at 1:20, the input should be 20 correct in cell 31?

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Yes Elijah, it is correct, as described in the manual.

Ok I had to do some adjustment and I now have the power reading spot on…but the SWR value is off. I’m going to go ahead and replace the diodes since I have them and keep tinkering for a bit and check back in a few days.?

The display is now functional too! Thanks Immo for the suggestion on the EPPROM and changing the offsets to zero.?

I appreciate everyone who is weighing in and helping me out.?