Posts
398
Following
437
Followers
342
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

Edited 1 month ago
10 GHz beacon testing around Seattle on the weekend. Frank AG6QV (https://ag6qv.com/Blog/uhrc) was able to receive via reflection from Puget Sound ferries. Now thinking about a proper mobile-mounted setup for quick 2-way contacts.

https://youtube.com/shorts/n0ZXhANwGXc?feature=share

#hamradio #amateurradio #microwave
0
0
1
jmorris

James Morris

Reply to @jmorris
Edited 1 month ago
This is bonkers for 6m. It's at the low end of the old VHF analog television channels (#2 in many places).
1
0
2
jmorris

James Morris

6m (50 MHz) FT8 over the past 15 minutes on pskreporter.info, strong TEP (transequatorial propagation)


#vhf #ft8 #hamradio #amateurradio #6m
2
0
6
jmorris

James Morris

Reply to @jmorris
Some hours later, got it working. Using the PCB as the temperature sensor, with a k-type thermocouple.
0
0
1
jmorris

James Morris

Calibrating the PID controller of a DIY reflow hot plate. Mistakes were made.
1
0
2
jmorris

James Morris

Reply to @th@v.st
@th @exiliaex amusing:
0
0
0
jmorris

James Morris

At Microwave Update in BC (https://www.microwaveupdate.org), one of the vendors had a 170 GHz spectrum analyzer. How is it possible in a device this size? #hamradio #microwave #amateuradio
2
0
4
jmorris

James Morris

Toured the TRIUMF particle accelerator in Vancouver BC, got to stand on top of a cyclotron. The magnetic field was strong enough to prevent paperclips from laying flat. It’s also where they store old focusing magnets (which become radioactive).
1
3
5
jmorris

James Morris

Reply to @jmorris
At https://www.triumf.ca
0
1
2
jmorris

James Morris

Tweety.
2
2
6
jmorris

James Morris

What am I supposed to do with this? Wrong answers only.
11
2
2
jmorris

James Morris

Imagine being a billionaire and not living in a house like this.
0
0
2
jmorris

James Morris

Really “enjoyed” hand soldering this VSSOP device with 0.5mm pitch. Time to get a hot plate reflow setup.
1
0
2
jmorris

James Morris

Reply to @jmorris
TIL: KiCad.
1
0
1
jmorris

James Morris

Should I install this software?
1
0
0
jmorris

James Morris

Very excited to have a paper published in DUBUS. I’ve been reading this journal for about a decade and never imagined when I started that I’d be published there. The journal is also translated into German (or English) by the editors, as it’s a dual language publication.

#hamradio #amateurradio #microwave
2
0
9
jmorris

James Morris

Reply to @jmorris
Edited 6 months ago
“Don’t ask me how I did it I just did it it was hard”. J/K, I will document this properly soon and it’s much simpler and than it looks.
1
0
3
jmorris

James Morris

It feels like cheating to use these pre-cut wire links for soldering (vs. push-in breadboard), but I’m over making these by hand. #amateurradio #hamradio #electronics
4
1
10
jmorris

James Morris

Prototyping a monitor circuit for GaN RF power amplifier devices. This is indicating drain current and heat sink temperature, and can be expanded to other measurements as needed. What started as a ‘simple’ project became an entire side quest. This uses an Arduino Pro Mini, an INA169 current sensor, and a thermistor. Could be done more simply with a PIC but this is what I had. The cheap OLED display self destructed not long after this photo, as I fed it 12v instead of Vcc.
1
0
2
jmorris

James Morris

Got slightly distracted in midjourney.

This is Seattle, Cascadia in 3357, on the 1000th anniversary of The Fault.

Idaho's Mount Mersini-Houghton is in the background. Also notable is the newly refurbished Space Needle Memorial.
0
1
1
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: