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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

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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jmorris
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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

Reply to
@vk6flab Look at the footnotes, especially 150. Why this is not called out explicitly in the national regs is unclear (FCC does the same here -- you need an army of lawyers for this stuff).
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jmorris

James Morris

Reply to
@vk6flab That is bananas. I've been out of .au for a few years now so didn't know this. All of the VH5A* entries in ACMA are for commercial or govt users in SA. One close callsign is the Bureau of Meteorology, so I was wondering if it was them monitoring for space weather.
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jmorris

James Morris

Reply to
@vk6flab I don't see it listed in the ACMA database. Could be a made up callsign for rx only.
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jmorris

James Morris

Reply to
@vk6flab They will show up if they are just listening, which is the case here. It's valid for people with the right experimental license, and possibly at very low levels within Australian ISM rules (I'm more up to date on the US rules here and it is in the microwatt range on these frequencies).
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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

Reply to @jmorris
btw, this is the best resource on #8m - https://ei7gl.blogspot.com/p/40-mhz.html

There's an io.groups list and a Facebook group ( 🤷 ), see url.
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jmorris

James Morris

Reply to @jmorris
Edited 2 years ago
Also, a very good signal here from VA2CY up on Île d'Orléans QC, with apparent doppler shift due to the movement of Sporadic E clouds between our stations. If you look closely at the top, there's a very weak trace from another station with some aircraft scatter (no decode). I think that is WM2XCW in Point Roberts,BC near the Canada/US border. ETA: confirmed this is not doppler shift, it's transmitter drift.
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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

Reply to
@mairin Good luck, been through a few of these types of things.
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jmorris

James Morris

Reply to
@robpike @io There even was a barber shop downstairs.
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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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