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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

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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jmorris

James Morris

Reply to
@jperrin Pretty sure I know why
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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

Reply to
@edward Is this all #fosdem people?
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jmorris

James Morris

Reply to
@brauner it's the worst of all worlds
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jmorris

James Morris

Clippy lives on 🤷🏼‍♂️
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jmorris

James Morris

Reply to
@b0rk @pixouls sorry this is happening. I greatly appreciate your work.
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jmorris

James Morris

Reply to
@bdowney @djm wow, that is crazy. SF is lost.
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jmorris

James Morris

Reply to
@mos_8502 I started programming seriously in editors like this, so many feelings. There's also "joe", which I used for kernel programming for a couple of decades.
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jmorris

James Morris

Reply to
@robpike @rsalz @zekjur where is it exactly?
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