I had a couple of papers published in 2024, which I’ll link here for reference:
- Investigating the Extended Frequency Range of the WA1MBA Millimeter Wave Quadrupler, DBUS, 2/2024. [PDF]
- Open Source Arduino Controller for Surplus Flatpack2 PSU, International EME Conference, Trenton, NJ, 2024. [Event Archive] [PDF] [GitHub]
Unfortunately, I was unable to travel to the EME conference in NJ to present the latter, and would have been in extraordinary company alongside a Nobel laureate (K1JT). While the Flatpack paper is not groundbreaking, I’m hoping it will be of practical use for people needing QRO DC power on a budget. The next EME conference is in 2026, so plenty of time to come up with something more innovative.
Regarding the mm-wave quadrupler, the gist of the paper is that the device was designed to provide output from 40-50 GHz, but its range of operation was determined to extend significantly above and below this, with useful signals produced from 27 to at least 95 GHz. Tom, WA1MBA, the creator of the quadruplers also confirmed a strong output signal on 76 GHz in his lab. The device has a Q-band microstrip filter on its output, so one open question is why it seems to not work as expected. Possibly more to come on this.
Wishing all a great 2025!