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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

Some weekend progress on my quick* Pi5 radio terminal project. I've since added a GPS HAT, to provide accurate time for digital modes & real-time grid determination.

* About a week, +/- six weeks.
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jmorris

James Morris

I think 6m is open.
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jmorris

James Morris

Radio folk: here's something I just learned. Sporadic E propagation sometimes opens up at night. Noticed some reports from AZ last night around 11PM for my 50 MHz FT8 test transmissions. Turns out this is or was an interesting research area.


#amateurradio #hamradio
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jmorris

James Morris

Minneapolis backrooms.
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jmorris

James Morris

Doing a bit of a deep dive into 3D printing engineering filaments this weekend. Nylon + CF is a great all-rounder, it seems. Perhaps like how 6061 Aluminium is for metal fabrication.
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jmorris

James Morris

Playing with a Raspberry Pi 5, 4MB RAM. It’s been a few years since I looked at the Pi — my old one is a v2. These have come a very long way.
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jmorris

James Morris

Reorganizing my home office & added a new switch to provide PoE and SFP. The latter is for steaming I/Q samples from mast-mounted SDRs for local processing. POE is for desktop IP phone (SPA525G) & SBC hacking.

Quite happy with this low-cost Linksys so far. 1990s me with a 10BASE2 net connected to a dial up modem would be astonished.
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jmorris

James Morris

Reply to @jmorris
Europe / Africa circuit. Thick blue line is the magnetic equator.
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jmorris

James Morris

Experimenting with 3D printed DIN rail mounts for projects. The attachment brackets are from open source hw projects, as are the WAGO & RS25 brackets. The PCB & vertical mount brackets are customized (to be published soon). I’ll adopt some kind of hole pattern standard for my own PCBs to simplify things. Possibly 20x20mm grid?
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jmorris

James Morris

Transequatorial propagation (TEP) on 6m is strong today. It follows Earth's magnetic field lines for certain distances across the equator for complex reasons, allowing N/S America or JPN/AUS communication on VHF at times.
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jmorris

James Morris

Good morning.
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jmorris

James Morris

Am I 3D printing correctly?
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jmorris

James Morris

Oh great. If you see an elephant with an IR flashlight on the side of the road, beware. https://www.ndss-symposium.org/ndss-paper/targeted-physical-evasion-attacks-in-the-near-infrared-domain/
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jmorris

James Morris

I need to find a better way to do this.
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jmorris

James Morris

Ok, nerds. Here’s a photo of a beta XBox (One S?) in dazzle camo, from a random hallway cabinet in Redmond.
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jmorris

James Morris

These color-coded hex tools are proof that Japan is living in the future.
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jmorris

James Morris

I don't know who needs to hear this, but f'ing magnets, how do they work?

https://www.youtube.com/watch?v=XKSjCOKDtpk
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jmorris

James Morris

New ⸭ ParticleOS ⸭ branding dropped!

Now to figure out how to get an IPE policy loaded, per Luca Boccassi's presentation at @fosdem https://fosdem.org/2026/schedule/event/DVVAV9-particle-os-from-trad-distro-to-immutable-image/
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jmorris

James Morris

Weekend projects. Setting up a small 76cm dish for easier portable use (than my 1.2m behemoth). Alignment on a Ku band geostationary satellite beacon (Galaxy 18), and now working on a printed bracket for the W1GHZ 10/24 GHz feed horn.

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#amateurradio #hamradio #satnogs #microwave #amsat #satellite
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jmorris

James Morris

Spent an eternity today retuning a 10-pole cavity filter. Started to feel like I was in an episode of Severance, manipulating patterns by intuition on 80s tech.
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