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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


Slow but sure progress on my 1kW HF/VHF amplifier power supply. Bought a PCB for the Eltek module and decided to solder the output wires (10 AWG THHN) rather than use the more common XT-60 connectors. After some research, I found out that XT-60s, commonly used for drones & RC batteries, are only rated at 30A continuous. The 60A figure is for peak current, and the available specs are very light on details generally. This PSU is being built for 40A continuous (at 50v), so the XT-60 is not sufficient. Next up will be to connect this Sparkfun CAN shield to configure & monitor the Eltek.
#hamradio #amateurradio #electronics
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This is all rack mountable & could be installed into gator cases for portable use with a generator. I like rack mounting into gator cases for home use generally as it can be all kept clean & self contained. And easily moved.
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And here is the power supply. 50 VDC @ 40A max. I’m using a surplus Flatpack2 server PSU, with space for a 2nd to run in parallel or backup. Also room for 28V (for relays) & 13.8V modules.
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@abraxas3d wow, that is crazy. Who owned/owns the 44 network ?
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@itaru @LinuxSecSummit yes if they fit the charter of Linux security development & collaboration.
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@abraxas3d ok, seems problematic that anyone can modify someone else’s application.
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@abraxas3d what happened to the money ?
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Next project: assemble these components from W6PQL into an MF/HF/6m amplifier. It’s specified for 1kW but I suspect it can do more. #amateurradio #hamradio
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Linux Security Summit 🐧

📢 The CfP for the Linux Security Summit EUROPE is now open! 📢

The event will take place Sept 20-21, in Bilbao, Spain.

See the CfP here:

https://events.linuxfoundation.org/linux-security-summit-europe/program/cfp/

The CfP closes on June 5.
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@mpi_grav also fascinating -- the optimistic articles in that newsletter from 2012, before gravitational waves had been detected. This is history happening right in front of us.

RE: https://social.mpdl.mpg.de/users/mpi_grav/statuses/110141099443133941
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@vk6flab no, it splits out channels from the sampled rf and demodulates them to audio, and then each audio channel is fed to its own wsjtx instance. I believe there are gnuradio modules which can decode these protocols, but this works.
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I’ve learned just enough #gnuradio to be dangerous. Now monitoring WSPR on two sub-bands of #8m as well as FT8 via an #rtl-sdr. Now if the sun could eject some coronal mass in this direction, that would be super. #hamradio #amateurradio #vhf #wspr
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@LWN I really need to adjust the fonts on this thing
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@abortretryfail If you're interested, check out https://groups.io/g/hflink
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@monsieuricon @corbet would certainly save many years or decades
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@abortretryfail very little these days on the amateur bands. ALE is more about automating HF and somewhat antithetical to most ham use. It is used in EMCOMM and land mobile, but generally on non-Amateur networks like SHARES.
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Edited 2 years ago
The antenna is the simplest version of http://hflink.com/antenna/#ATU

Needs to be broadband and capable of fast frequency change (either via an ATU or inherent broadband design).

I'll be testing this on the HFN network over the weekend.
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