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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

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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jmorris

James Morris

Furiously (not really) building an S-Band receiver for the Artemis II mission.
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jmorris

James Morris

British Airways AI. Glad they’re not trying to do anything difficult or life-critical with technology.
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jmorris

James Morris

Regularly asking yourself "What if everything I know is wrong?" is important.

https://youtube.com/shorts/EMV0VXpvPgo?si=fcOg6mfNWn-0kvUX
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jmorris

James Morris

Edited 5 months ago
Meteor scatter is fun & addictive. Should be a good opportunity for folk (in the US and EU, at least) to try receiving over December 11/12.

Receiving is actually pretty easy on 6m. You can do it with a simple dipole, an RTL-SDR, and WSJT-X. Better with a gain antenna like a Moxon. Use the pskreporter site to see where other stations are active on 6m msk144, aim roughly at the "radiant" midpoint and leave running overnight.

If you've decoded AIS, ADS-B, APRS etc., you can easily do this.



📡 See: https://www.hamsci.org/msqp
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