So, after finishing up my ATU 100, it was time to … you know, actually use it. As I got the ATU 100 to pair up with my µBitx v5, this is what I used to test. Output was into the previously built dummy load, ran two batches of tests: first with 12V into the µBitx, second with 13.8V. As expected, the power is higher with 13.8V.
µBitx v5 on 12V
µBitx v5 on 13.8V
Results
| Band | 12V | 13.8V |
| 160m | 24W / 19W | 25W / 19W |
| 80m | 15W / 12W | 18W / 15W |
| 60m | 14W / 11W | 17W / 14W |
| 40m | 13W / 11W | 16W / 13W |
| 30m | 11W / 8.7W | 13W / 11W |
| 20m | 7.8W / 6.1W | 9.7W / 7.6W |
| 17m | 8.3W / 6.5W | 10W / 8.3W |
| 15m | 6.4W / 5W | 8.3W / 6.4W |
| 12m | 4.4W / 3.4W | 5.5W / 4.2W |
| 10m | 4.3W / 3.2W | 5.4W / 4.1W |
Conclusion
As expected, 13.8V gives us more power.