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Linux Kernel security developer, working for Microsoft. Also W7TXT. Views are my own.
Topics: #Linux #kernel #security, #amateurradio, #RF, #hamradio, #electronics, #science, #radioastronomy, #physics, #space, #arduino.

📡 https://w7txt.net/
🐧 https://blog.namei.org/
☠️ https://www.facebook.com/w7txt
jmorris

James Morris

Tweety.
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jmorris

James Morris

What am I supposed to do with this? Wrong answers only.
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jmorris

James Morris

Imagine being a billionaire and not living in a house like this.
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jmorris

James Morris

Really “enjoyed” hand soldering this VSSOP device with 0.5mm pitch. Time to get a hot plate reflow setup.
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jmorris

James Morris

Reply to @jmorris
TIL: KiCad.
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jmorris

James Morris

Should I install this software?
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jmorris

James Morris

Very excited to have a paper published in DUBUS. I’ve been reading this journal for about a decade and never imagined when I started that I’d be published there. The journal is also translated into German (or English) by the editors, as it’s a dual language publication.

#hamradio #amateurradio #microwave
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jmorris

James Morris

Reply to @jmorris
Edited 1 year ago
“Don’t ask me how I did it I just did it it was hard”. J/K, I will document this properly soon and it’s much simpler and than it looks.
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jmorris

James Morris

It feels like cheating to use these pre-cut wire links for soldering (vs. push-in breadboard), but I’m over making these by hand. #amateurradio #hamradio #electronics
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jmorris

James Morris

Prototyping a monitor circuit for GaN RF power amplifier devices. This is indicating drain current and heat sink temperature, and can be expanded to other measurements as needed. What started as a ‘simple’ project became an entire side quest. This uses an Arduino Pro Mini, an INA169 current sensor, and a thermistor. Could be done more simply with a PIC but this is what I had. The cheap OLED display self destructed not long after this photo, as I fed it 12v instead of Vcc.
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jmorris

James Morris

Got slightly distracted in midjourney.

This is Seattle, Cascadia in 3357, on the 1000th anniversary of The Fault.

Idaho's Mount Mersini-Houghton is in the background. Also notable is the newly refurbished Space Needle Memorial.
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jmorris

James Morris

Found an exit.
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jmorris

James Morris

Reply to @jmorris
two days later…
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jmorris

James Morris

More progress on the 30W 10GHz amplifier. Almost ready to test.
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jmorris

James Morris

Reply to @jmorris
More clues
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jmorris

James Morris

Mystery object challenge: what is this and in how many ways can it hurt you?
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jmorris

James Morris

Seen @ work
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jmorris

James Morris

Finally learning to mill, in a work makerspace. This is a game changer for all kinds of projects. My first task is smoothing out a copper heat spreader, which was extruded and less than ideal for heat transfer.
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jmorris

James Morris

Finally bought what seems to be the bible on #radioastronomy - Kraus. I have several other books which seem to defer to Kraus on some of the “basics”. Good to have all of the essential information in one place. Seems this book is only currently available as ring bound or a cheap paperback. One specific goal I have here for 2024 is to properly understand wave polarisation & Stokes parameters.
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jmorris

James Morris

Edited 1 year ago
Finished making a thing. This is a power supply for the 30W 10 GHz amplifier I’m working on. It should also be able to power the transverter, IF radio, & relays. I’m resisting the temptation to add an MCU and display. For now.

(Note: the 50 Hz label should say 60 Hz)

#hamradio #electronics #amateurradio #microwave #qro #sspa
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