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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

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 2 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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jmorris

James Morris

FYI. This is/was a strong password & supposedly protected.
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jmorris

James Morris

I can highly recommend getting a ferrule crimper for connecting wires to these kinds of terminals.
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jmorris

James Morris

AI really is no fun.
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jmorris

James Morris

I finally bought a USB microscope and wow does it help with reverse engineering RF circuits. Quite an interesting & surreal world down there, too. This is from a 60 GHz wireless backhaul device. The RF wavelength is about 4.5mm.
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jmorris

James Morris

Large discone antenna in Arizona, covers 3-30 MHz. Licensed amateur operators can use this, at the Titan Missile Museum. I didn’t have a radio with me.
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jmorris

James Morris

WSPR and Red Bull for breakfast in Eastern WA.
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jmorris

James Morris

Collected various bits of 80s surplus over a couple of years and now I can “see” signals from DC to sub-millimeter (300 GHz+), in theory at least. This is a 25 GHz signal.
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jmorris

James Morris

DIY window feed through for running RF cables from inside to outside. You can buy these but I had the parts.
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jmorris

James Morris

Reply to @oshpark@fosstodon.org
@oshpark @kicad Now verified to work with the HMC doubler as expected. Thanks for making this possible! I plugged the laminate specs from your site into a couple of calculators and they were in close agreement, as are the test results. 4-layer is the next step. I'll publish the design & will be presenting the overall project at Microwave Update (MUD) in a couple of weeks.
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jmorris

James Morris

Reply to @jmorris
@kicad @oshpark amazingly, the 0.8mm FR4 material works very far out of its expected range, and is useful up to ~16 GHz with acceptable loss & SWR for my hacking purposes.
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jmorris

James Morris

Reply to @jmorris
Boards arrived from @oshpark -- next step, soldering.


@kicad
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jmorris

James Morris

Running make -j32 to build a kernel on my new work workstation. Takes about a minute, in total silence.
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jmorris

James Morris

Learning KiCAD.



@kicad
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jmorris

James Morris

Where am I? Wrong answers welcome.
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