Posts
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Following
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Followers
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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/
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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

Reply to @va3db@mastodon.radio
@va3db @n8dmt in theory we are empowered (in the US at least) to identify emissions which impact us and work with the offender, but I wonder if that is a productive use of time. We are doing the FCC's job, and they should pay us for that.
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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

Reply to @va3db@mastodon.radio
@va3db @n8dmt FWIW, I have had good RF experiences with the Samlex units made for radios, and MeanWell modular units for use inside project boxes.
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jmorris

James Morris

Reply to @ftg@mastodon.radio
@ftg No. This will eventually fail and fall off, probably while driving down the highway.
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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

Reply to @pathunstrom@ngmx.com
@pathunstrom yes.
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jmorris

James Morris

Reply to @MW1CFN@mastodon.radio
@MW1CFN Thanks, some great info there!
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jmorris

James Morris

Reply to @analgesicsleep@mastodon.social
@analgesicsleep Misleading advertising!
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jmorris

James Morris

Reply to @K4NE@mastodon.hams.social
@K4NE It's the Andonstar AD246S-M, which was recommended to me by another microwaver. Has HDMI out, and a smaller installed screen, which is probably right for me.
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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

Reply to @MW1CFN@mastodon.radio
@MW1CFN yes, indeed, it's on my list of things to try. A couple of years ago I noticed a station in NZ was able to copy some very weak signals from me and it turned out they were using a Wellbrook receiving loop. By the time I wanted to then buy one, they went out of business and I just missed their final sale. I do need to be able to transmit, so not quite the end of the world.

Loops seem to be a reasonable option for vehicle mounted HF as well. They may look ungainly but so does everything if you want to cover 3-30 MHz.
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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

Reply to @touk@smores.town
@touk get out
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jmorris

James Morris

Reply to @MW1CFN@mastodon.radio
@MW1CFN you have an amazingly quiet QTH! I get S9 noise on many HF bands and I'm often shocked to see ~zero noise when portable. Could be I need better grounding & setup, too.
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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

Reply to @MW1CFN@mastodon.radio
@MW1CFN would be interesting to measure the background noise at each location, too.
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