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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

Testing a 2-wire fan dipole on HF, doing some ALE. It’s always fascinating to see physics & information theory working per the math. Anyone else?
#amateurradio #hflink #ale #hf #antenna #rf #hamradio #radio
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jmorris

James Morris

Very useful!

RE: https://fosstodon.org/users/kernellogger/statuses/110059888755223720
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jmorris

James Morris

Finally learning #gnuradio. It's amazing.
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jmorris
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LinuxSecSummit

Linux Security Summit 🐧

ICYMI

RE: https://social.kernel.org/objects/b29af78c-329b-4bbb-9d99-81299bd1b6e7
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LinuxSecSummit

Linux Security Summit 🐧

📢 The schedule for the 2023 Linux Security Summit North America is published! 📢

See https://lssna2023.sched.com/

LSS-NA 2023 will be held in Vancouver, BC, Canada 🍁 from May 10-12.

🖋 Register to attend here: https://events.linuxfoundation.org/linux-security-summit-north-america/register/
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jmorris

James Morris

@pid_eins great to see this!

RE: https://mastodon.social/users/pid_eins/statuses/109959112315995623
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jmorris

James Morris

re: CW transphobia
Show content
@ruscur depressing & just not where we should be in 2023

RE: https://ozlabs.house/users/ruscur/statuses/109964183572477416
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jmorris

James Morris

Edited 2 years ago
Slightly longer form blog on recent #8m experiments:

https://w7txt.net/2023/03/03/adventures-in-the-8m-band/

#amateurradio #hamradio #vhf #wspr
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jmorris

James Morris

I've been monitoring the 8m band recently (yes, 8m!). It's generally an ISM band with some experimental licenses issued in the US, Canada, and other countries, as well as a few amateur allocations in Europe. Some great propagation happening today between Australia/NZ and USA/Canada, on 40.68 MHz.

#hamradio #amateurradio #wspr #8m #40MHz #vhf #radio
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jmorris

James Morris

Edited 2 years ago
On a whim I tuned to the 630m band in WSPR, and was surprised to see a couple of stations. I had no idea my system could receive anything on 474 kHz. I think the signal around 1840 Hz baseband is QRSS.

The antenna is just a 100ft dipole fed with ladder line via a 4:1 balun and tuner. I believe the tuner was set for 80m.

#amateurradio #wspr #wsjtx #hamradio #radio #mf
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jmorris

James Morris

Found something very useful -- a site with a collection of creative commons #science & #math texts. Some quite old but still excellent.

http://www.vias.org/

Some good coverage of #valve #electronics (it's not easy to learn about these days), and the #radio #antenna book has some very useful info: http://www.vias.org/radioanteng/
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jmorris

James Morris

Pro-tip: assume every Micro-B USB cable is a power-only cable until proven otherwise. I was sure I bricked my Airspy R2 SDR receiver, swapping in multiple different cables, different laptops, operating systems etc. Turns out every cable I picked up was for power only, even though I "knew" they were all data cables.

tl;dr: #USB

#airspy #hamradio #amateuradio #rf #sdr #radio
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jmorris

James Morris

Interesting #fosdem lightning talk - https://fosdem.org/2023/schedule/event/gitlab_forge_for_teachers_and_students_in_france/

A gitlab forge for all teachers & students in France, supported by the Govt. I can't imagine what it would take to see something like this in Australia.
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jmorris

James Morris

Railgun Lab auction for anyone near wherever this is in Va: https://www.proxibid.com/Linkous-Auctioneers/ELECTROMAGNETIC-RAIL-GUN-SYSTEM-and-LAB-EQUIPMENT/event-catalog/236367?lr=1675929422949
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jmorris

James Morris

Getting #fosdem FOMO, need to get there one of these years.
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jmorris

James Morris

Clippy lives on 🤷🏼‍♂️
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jmorris

James Morris

This is the Xgecu T48 universal programmer, arrived with a Lunar New Year gift. The T48 supports over 32000 chips, including a bunch that of older MCUs such as the PIC16C*

#electronics
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LinuxSecSummit

Linux Security Summit 🐧

📣 The CfP for the 2023 Linux Security Summit North America is now open! 📣

See: https://events.linuxfoundation.org/linux-security-summit-north-america/program/cfp/

LSS-NA 2023 will be held in Vancouver, BC, Canada from May 10-12.

CfP submissions are open until March 1st!

#linux #linuxsecuritysummit #linuxfoundation #security #infosec
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jmorris

James Morris

Friday night fun -- learned how to use BitMagic & Tigard devices with PulseView software to make a logic analyzer. It works!
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jmorris

James Morris

Can we embed videos here? Here's some nice #winlink activity, getting 3230 bps on 30m, over a distance of 400km. The 2750 Hz bandwidth is nice if your rig supports it!

https://www.youtube.com/watch?v=dJvC81YkmAs

#hamradio #amateurradio #hf #vara
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