Just a warning for people thinking about getting into #microwave #amateurradio -- it's an infinite labyrinth of hobbies, knowledge, and equipment. Precision machining, stripline circuits, strange semiconductors (IMPATT diode amplifier, anyone?), exotic electron tubes (which will try and kill you via xrays, lethal voltages, and beryllium oxide), metrology, physics, DIY, vintage equipment resurrection, morse code (modulation? sheer luxury!), scouring ebay, haunting electronics stores, poring over poorly scanned service manuals from defunct companies, and too many hex keys.

Oh, and it's a gateway drug to #radioastronomy.

#hamradio

@evacide Yikes. How much information did Verizon actually need to collect or keep?

RE: https://hachyderm.io/users/evacide/statuses/111608814425154905

Making some hopefully final mods to the azimuth sensor for this az/el drive. Spent ages trying to find screws to match the Hammond enclosure. Turns out to be M3.5, which I have never seen used before. #hamradio #amateurradio #microwave #radioastrnomy

TIL my 50 MHz scope is still somewhat usable up to 150 MHz.

A new release of SETools is available:

https://github.com/SELinuxProject/setools/releases/tag/4.4.4

Changes:

* Update for compiling with libsepol 3.6.
* Update apol to use fully specified PyQt enums.
* Correct minor code lint issues.

Another reminder that you only have ONE week left to submit to the containers or kernel devrooms at FOSDEM 2024!
https://stgraber.org/2023/11/26/containers-and-kernel-devrooms-at-fosdem-2024/

A 2023 #scientist #linocut for #ArtAdventCalendar of #astronomer Vera Rubin (neé Cooper, ‘28-‘16) & her discovery that angular motion of galaxies deviates from predictions, 1st evidence for dark matter, now known as 5x as common as matter & the stuff which dictates dynamics of galaxies & evolution of our universe! The Nobel committee waited 3 years after she died to reward another for the theory of dark matter.

She found 6 months mat leave post MSc very difficult 🧵1/n

#printmaking #sciart

#EmacsConf was tons of fun! :) The prerecorded videos are up at https://emacsconf.org/2023/talks and I'll work on extracting the live talks and Q&A this month.

It ain’t much, but it’s honest work. Az/El sensors serial (SSI) to Arduino board. Removed an RS485 layer.
@adafruit 1/4 size proto boards are cute.

Just tripped across this blast from the past: my first published article, in an .au electronics magazine.

Remember paper magazines? No? Ok.



#hamradio #amateurradio #satellite #electronics

Hey #Linux #Kernel people. Last year we had the first #Kernel Devroom at #FOSDEM. And we're running the #Kernel Devroom for #FOSDEM in 2024 as well!

#FOSDEM 2024 is taking place over the weekend of the 3 & 4 February in Brussels, Belgium!

It is a wonderful event that's very close to my and a lot of people's hearts!

Join @rppt, Daniel Borkmann, and @stgraber, and myself and make this another great #FOSDEM!

We're very excited for your submissions!

https://lists.fosdem.org/pipermail/fosdem/2023q4/003536.html

📢 The CfP for the 2024 Linux Security Summit North America is open!

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

Location: Seattle, USA

Dates:
- CfP close: January 21, 2024
- Speaker notifications: February 06, 2024
- Event: April 18-19 2024

Performed some more mm-wave testing at the PNW Microwave build day, looking at the output of the 40-50 GHz quadrupler. Thanks to W7GLF for bringing in his spectrum analyzer & external mixer. Results forthcoming.


#amateurradio #hamradio #microwave #mmwave #electronics

Videos and slides from the 2023 Linux Security summits may be found here:

• Linux Security Summit North America (LSS-NA), May 10-12 2023, Vancouver, Canada.
  • Video playlist
  • Slides & abstracts
• Linux Security Summit Europe (LSS-EU), September 20-21 2023, Bilbao, Spain.
• Video playlist
• Slides & abstracts

This is the good stuff:

→ https://fedoramagazine.org/create-images-directly-from-rhel-and-rhel-ubi-package-using-mkosi/

written by @zbyszek

Getting ready to do a test run of my probing class for my first in person beta audience.

This will be my second test run of the lecture (first was a YT livestream a year or so ago) and the first time doing the labs.

There's still more meat I want to add especially towards the end of the class (e.g. the section on current probing is just a handful of slides, and there's no lab for it yet as i don't have any current probes here) but it'll be good to get feedback from a test audience on pacing and content.

Probably going to do at least one more test round early next year before I start doing it officially. Looking into getting registered with IEEE to provide approved continuing education / professional development hours as well.

Testing a Ka band LNB, specified for 20.2-21.2 GHz. I could not see any signals beyond 22.8 GHz (well short of the 24 GHz amateur band), but that could be due to issues at the IF level. Worth investigating further. I was able to see a good signals at 22.2, an important radio astronomy frequency. #amateurradio #microwave #radioastronomy

@jcutting this is the content I signed up for

RE: https://social.vivaldi.net/users/jcutting/statuses/111446741178195059

Just received this in gmail. Seems like my ad blocker and/or ublock origin is working well here to stop them tracking my behavior. I have in fact been opening their emails. UbO for the email shows dozens of blocked requests to play.google.com and other related sites.

Current non-fiction reading pile.