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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

Reply to @gigabecquerel@chaos.social
@gigabecquerel I'm guessing useful also for examining things at die scale.
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jmorris

James Morris

Edited 16 hours 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

Reply to @gigabecquerel@chaos.social
@gigabecquerel what is a polariscope and where can I get one? Sounds like something I need.
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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

Reply to @arrjay@tacobelllabs.net
@arrjay no
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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

Reply to @azonenberg@ioc.exchange
@whitequark @azonenberg @niconiconi I have seen something like this in commercial radio gear, which may have great baseline performance and build, but have very mid he support for digital waveform compared to open source software implementations. That said, it is reflected in pricing, e.g: $900 for consumer hw + OSS; $3000 for commercial hw; $30k for military hw.
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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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