开云体育

Greetings all.?
I got a ATU-100 complete inside a case and I went to do the QRP mod on it. Then I got put in the hospital and when I got out I tried to put it all back together and it did not work. I have another one that was given to me and it looks like it also has the QRP mod done to it (the turns on the bono core are 10 instead of 20) and I do not know if it works or not.?

I would like to get one of these working and use it as an internal ATU on my uBITX QRP transceiver. There is plenty of room inside the case for it. I'm hoping that with some help from this group and between the two ATU units we can get on working inside my uBITX.? I would like some sort of an indicator for it, I don't know if I want to use an OLED, an LED, or a SWR meter.?

I do not know where to start with this, I would appreciate it if someone pointed me in the right direction.?

Aaron
AAron@...

Aaron - I have four of these tuners with three being modded for QRP and one of them incorporated into one of my uBITX radios as you plan - great combo!? I suppose maybe the first step would be defining for us just exactly what "doesn't work" means.

Here's my ubitx with "integrated" ATU-100...



73,

Justin B.
KI5GKD

Hi, Aaron

First of all, read the memory and check the cells values, according to user manual.
You can find there what is power level to start a tuning, how many turns should be on the tandem core.

At the second - check if the indicated power level and SWR correspond to real values with 10% tolerance.

Also check the diodes on the tandem bridge , mine had schottky diodes
smb33 and replaced them with 1N5711 !

73's
Jason 9H5BM

What I mean in not working is that I can't tell if it is on or not. The OLED is not coming on.?
I will go over the suggestion that you all have gave me and I will get back to you.?
Justin KI5GKD, that is the exact case that I am using, however, my metalworking skills are lacking and I butchered the front and rear panels beyond repair so I will be making some replacements. What size is your Nextion? I went with a 3.5"
I will replay after I:

• check the cell values
• turns on the tandem core
• diodes

Aaron@...

Aaron - If the display is comatose double check it's wiring.? I know I often get the data and clock lines swapped and IIRC the display will appear dead.

73,

Justin B.
KI5GKD

Oh, the radio in the pic is using a 3.5" Nextion...