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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

The results are in, with 18 votes. I kind of like bsky but not seeing a critical mass of people in my areas of interest.

If you answered other, please feel free to explain.

In honor of this landslide vote, here's a photo of my latest tinkering: making pipecap filters for an 11 GHz RF multiplier (using the W1GHZ board & design). I'll use brass M3 tuning screws once some arrive from McMaster-Carr, although I'd be interested to see if they are very different to stainless steel. And yes, I had to order them online after not finding any metric brass fasteners locally. Why not use SAE screws? Standard metric screws have much higher TPI, even more than fine-thread SAE. This will provide better mechanical stability & finer tuning, but then again, I'm not building a spaceship here, so 🤷

#hamradio #amateurradio #microwave #rf #nerds #fediverse

RE: https://social.kernel.org/objects/81c8273c-6a3f-43d9-bfc9-673541118280
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jmorris

James Morris

Weekend tinkering: finally made enough room for a microscope on my bench and looked at small things. The chip of interest is 0.7mm wide: a ~60 GHz amplifier.

#hamradio #amateurradio #electronics #rf #mmic #microwave #millimeterwave #mmwave
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jmorris

James Morris

From an ebay listing. It's real.
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jmorris

James Morris

Edited 6 months ago
10 GHz beacon testing around Seattle on the weekend. Frank AG6QV (https://ag6qv.com/Blog/uhrc) was able to receive via reflection from Puget Sound ferries. Now thinking about a proper mobile-mounted setup for quick 2-way contacts.

https://youtube.com/shorts/n0ZXhANwGXc?feature=share

#hamradio #amateurradio #microwave
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jmorris

James Morris

Reply to @jmorris
Edited 6 months ago
This is bonkers for 6m. It's at the low end of the old VHF analog television channels (#2 in many places).
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jmorris

James Morris

6m (50 MHz) FT8 over the past 15 minutes on pskreporter.info, strong TEP (transequatorial propagation)


#vhf #ft8 #hamradio #amateurradio #6m
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jmorris

James Morris

Reply to @jmorris
Some hours later, got it working. Using the PCB as the temperature sensor, with a k-type thermocouple.
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jmorris

James Morris

Calibrating the PID controller of a DIY reflow hot plate. Mistakes were made.
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jmorris

James Morris

Reply to @th@v.st
@th @exiliaex amusing:
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jmorris

James Morris

At Microwave Update in BC (https://www.microwaveupdate.org), one of the vendors had a 170 GHz spectrum analyzer. How is it possible in a device this size? #hamradio #microwave #amateuradio
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jmorris

James Morris

Toured the TRIUMF particle accelerator in Vancouver BC, got to stand on top of a cyclotron. The magnetic field was strong enough to prevent paperclips from laying flat. It’s also where they store old focusing magnets (which become radioactive).
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jmorris

James Morris

Reply to @jmorris
At https://www.triumf.ca
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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 11 months 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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