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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

Do you have a Skådis board, a specific make and model of electric screwdriver, and a 3D printer? If so, this is your lucky day.

https://www.printables.com/model/1778111-skadis-holder-for-milwaukee-m4-electric-screwdrive
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jmorris

James Morris

Inching closer to an initial release of this project (RF Deck). Incorporating changes after some field testing a couple of weeks ago.

The onboard GPS antenna is an issue, it’s pointed out the back of the device, which will often mean it’s pointed down at an angle. Flipping it over means it will look directly at the metal case of the touchscreen. Best option is a smaller GPS board which can point up, or a separate embedded antenna. For now I am using an external GPS antenna which can be magnetically attached to the top of the enclosure (see embedded magnet near fan).
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jmorris

James Morris

Edited 12 days ago
New funnel just dropped.

https://www.printables.com/model/1767474-simple-desiccant-funnel
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jmorris

James Morris

Edited 14 days ago
It's the weekend, somehow.

Anyone working on fun projects?

I have fresh polymers, a pile of aluminium extrusion, and a fistful of vague ideas.
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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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