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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

Edited 4 days 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

@stgraber nice!

RE: https://hachyderm.io/@stgraber/115645419902489080
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jmorris

James Morris

A couple of shell aliases I use all the time:

alias gg="git grep"
alias gt="glow -t"

The last is for viewing .md files.
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jmorris

James Morris

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

James Morris

Kind of weird to think that Voyager 1 is 25 billion km away, transmits with about 22 watts of RF power, and we can still hear & decode it here it on Earth.
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jmorris

James Morris

Video of reflow soldering with an MHP50 hotplate. Works pretty well for small boards. I was previously using a hot air gun but it would blow the components around. Can also more accurately follow the manufacturer reflow specs.

https://www.youtube.com/watch?v=rdS6JTRX_HA
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jmorris

James Morris

@strangeparts not sure I would enter such a room.

RE: https://mastodon.strangeparts.com/@strangeparts/115515407911086704
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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
repeated
david_chisnall@infosec.exchange

David Chisnall (*Now with 50% more sarcasm!*)

We have released 1.0 of the #CHERIoT specification! The architecture has been unchanged for almost a year and has been implemented in two open-source cores. We (SCI) are getting back our first CHERIoT silicon from the fab soon and will be moving to mass production net year (I can't talk about what other people are doing with CHERIoT).

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jmorris

James Morris

@mossmann very cool: measuring < 0.01 Hz changes in an 60 kHz signal from Colorado while flying in a passenger jet is impressive.

RE: https://mastodon.social/@mossmann/115493045854686572
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jmorris

James Morris

AI really is no fun.
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jmorris

James Morris

@jbz who needs Black Mirror?

RE: https://indieweb.social/@jbz/115435878385867328
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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

@andersonc0d3 congrats! Good to see bugfixes with the reporting.

RE: https://infosec.exchange/@andersonc0d3/115419629407280002
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jmorris

James Morris

I gave a talk on generating millimeter-wave signals from 122-141 GHz at Microwave Update on the weekend.

https://microwaveupdate.org

Here are the slides: https://w7txt.net/wp-content/uploads/2025/10/A-Synthesized-F-Band-Signal-Source-for-122-and-134-GHz-v1.pdf
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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

"Looks like there aren't many options for WJ-340 VLF receiver. Consider this used farm tractor or a pair of flannel pajamas."
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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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