Posts
422
Following
443
Followers
343
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
repeated
pid_eins@mastodon.social

Lennart Poettering

My 1st FOSDEM talk is now online, too. An exciting hour of me rambling about our TPM future, with a focus on what's in store for distributions:

https://video.fosdem.org/2024/ua2118/fosdem-2024-1985-ukis-tpms-immutable-initrds-and-full-disk-encryption-what-distributions-should-keep-in-mind-when-hopping-onto-the-system-integrity-train.av1.webm

Enjoy!

0
6
1
jmorris
repeated
brauner@mastodon.social

Christian Brauner 🦊🐺

I'm done writing groff.
https://github.com/brauner/man-pages-md

2
4
2
jmorris

James Morris

It's been a while since I looked into different #fediverse clients. Is there a good threaded web based client, or cross-platform app?
1
0
0
jmorris

James Morris

@kellylepo great story, which I'm assuming is getting very well known now

RE: https://astrodon.social/users/kellylepo/statuses/111881078696230611
0
0
0
jmorris

James Morris

Edited 11 months ago
#electronics Pro Tip: do not apply -30V DC across the Vin+ and Vin- pins of INA169 current sensor chips. They don't like it.

Great high-side alternative to low-side digital current meters, fwiw:
https://www.adafruit.com/product/1164
0
0
0
jmorris

James Morris

@g4dbn decent antenna setup

RE: https://mastodon.radio/users/g4dbn/statuses/111865540448497761
0
0
0
jmorris

James Morris

Edited 11 months ago
Finished making a thing. This is a power supply for the 30W 10 GHz amplifier I’m working on. It should also be able to power the transverter, IF radio, & relays. I’m resisting the temptation to add an MCU and display. For now.

(Note: the 50 Hz label should say 60 Hz)

#hamradio #electronics #amateurradio #microwave #qro #sspa
2
1
5
jmorris

James Morris

Edited 11 months ago
Not sure if this microwave power sensor is repairable. It’s an HP P486A waveguide thermistor mount for 12.4 to 18 GHz. It was bugging out, and I’ve rejuvenated one of these before (using the guidelines in the manual) but it didn’t work this time. I’m puzzled by the mechanics of this, what the adjustment screw actually does, and why is it attached to a small metal block which is maybe held with conductive paste? It’s supposed to finely match the inner and outer thermistors: one is in the waveguide and the other is inside the housing as a reference. The waveguide thermistor is heated by the RF signal, and the power meter detects this, via a bridge circuit which tries to balance the current in each thermistor.

The wonders of 1960s microwave tech. We explored space with this stuff.

#hamradio #amateurradio #microwave #electronics
2
0
4
jmorris
repeated
jbaert@mastodon.social

Jeroen Baert

Crazy read: detecting positions of players in Counterstrike by *listening to their GPU over a microphone*

https://faculty.cc.gatech.edu/~genkin/papers/lendear.pdf

0
20
2
jmorris
repeated
keithp@fosstodon.org

keithp

Released picolibc version 1.8.6 today.
Highlights: ctype avoids a static array, fenv functions are inlined (except on x86).
Full release notes here: https://github.com/picolibc/picolibc/releases/tag/1.8.6

0
2
1
jmorris
repeated
LinuxSecSummit

Linux Security Summit 🐧

❕ 📢 Note: The LSS-NA 2024 CfP has been EXTENDED ❕

🐧 The new CfP deadline is: Sunday, February 4 at 11:59 PM PST

🐧 For full details, see
https://events.linuxfoundation.org/linux-security-summit-north-america/program/cfp/

RE: https://social.kernel.org/objects/a91fa775-15d9-4ee0-bc99-f9b40cad10c5
1
4
2
jmorris
repeated
emsl@mastodon.cloud

Evil Mad Scientist

Announcing the acquisition of Evil Mad Scientist by Bantam Tools.

Dr. Windell Oskay & Lenore Edman will be joining as CTO and COO of Bantam Tools in Peekskill NY.

Pen plotter enthusiasts can look forward to a new generation of art machines in Spring 2024.

More at: https://www.evilmadscientist.com/2024/bantam-tools/

5
4
1
jmorris
repeated
securepaul@fosstodon.org

Paul Moore

SELint, a linter for SELinux policy sources, released a new version yesterday: SELint v1.5.

https://github.com/SELinuxProject/selint

0
1
1
jmorris

James Morris

Working on a 10 GHz power amp. #hamradio #amateurradio #electronics #microwave
2
0
10
jmorris
repeated
ftg@mastodon.radio

ftg

Very shiny for +50years old equipment.

2
3
1
jmorris

James Morris

@LWN they grow up so fast

RE: https://fosstodon.org/users/LWN/statuses/111581306340618478
0
0
1
jmorris

James Morris

Edited 1 year ago
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
4
9
20
jmorris

James Morris

Edited 1 year ago
@evacide Yikes. How much information did Verizon actually need to collect or keep?

RE: https://hachyderm.io/users/evacide/statuses/111608814425154905
0
0
0
jmorris

James Morris

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
1
0
1
jmorris

James Morris

TIL my 50 MHz scope is still somewhat usable up to 150 MHz.
0
0
5
Show older
About social.kernel.org

Terms of service

  1. Please do not use this service in violation of the Linux Kernel Code of Conduct. Doing so will result in your account suspension with the referral of the matter to the CoC committee.

  2. "Repeating"/"boosting" someone else's status on this platform will be treated as endorsement and will fall under rule #1.

  3. You are encouraged to use this platform to promote your work on the Linux Kernel, but there is no restriction on permitted topics (with the exception of anything covered by #1 above).

  4. There is no requirement to post in English, but it should be considered the primary language of communication on this platform.

Privacy notice

The admins of this service have access to all posted statuses. They aren't looking, but if it's something they shouldn't know about, then you should not post it on this platform.

Please see the Linux Foundation Privacy Policy, which applies to this platform as well.

Getting your own account

If you would like an account on this instance, please check that the following applies to you:

  • You are listed in MAINTAINERS or CREDITS

  • OR: You have a kernel.org account or email address

  • OR: You have a long and established history of involvement with the Linux Kernel

If the above is true and you agree with the Terms of Service and Privacy Notice listed above, please use these instructions to request an account: