Posts
419
Following
442
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

James Morris

@kernellogger very nice!

RE: https://fosstodon.org/users/kernellogger/statuses/110282350145400526
1
0
2
jmorris

James Morris

@jayulfelder Anti-trans speech is a form of violence, in my view.

RE: https://mastodon.online/users/jayulfelder/statuses/110265185818357788
0
0
0
jmorris

James Morris

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
0
0
1
jmorris

James Morris

@LinuxSecSummit ICYMI

RE: https://social.kernel.org/objects/e72fbf67-74c7-4945-a9c6-5ea76dd25c99
1
1
1
jmorris

James Morris

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
1
0
6
jmorris
repeated
LinuxSecSummit

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.
0
8
4
jmorris

James Morris

@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
0
0
1
jmorris

James Morris

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
1
1
6
jmorris

James Morris

@brauner nice coverage!

RE: https://mastodon.social/users/brauner/statuses/110119441612643099
0
0
2
jmorris

James Morris

Testing a 2-wire fan dipole on HF, doing some ALE. It’s always fascinating to see physics & information theory working per the math. Anyone else?
#amateurradio #hflink #ale #hf #antenna #rf #hamradio #radio
2
1
6
jmorris

James Morris

Very useful!

RE: https://fosstodon.org/users/kernellogger/statuses/110059888755223720
0
0
0
jmorris

James Morris

Finally learning #gnuradio. It's amazing.
1
1
7
jmorris
repeated
LinuxSecSummit

Linux Security Summit 🐧

ICYMI

RE: https://social.kernel.org/objects/b29af78c-329b-4bbb-9d99-81299bd1b6e7
0
1
1
jmorris
repeated
LinuxSecSummit

Linux Security Summit 🐧

📢 The schedule for the 2023 Linux Security Summit North America is published! 📢

See https://lssna2023.sched.com/

LSS-NA 2023 will be held in Vancouver, BC, Canada 🍁 from May 10-12.

🖋 Register to attend here: https://events.linuxfoundation.org/linux-security-summit-north-america/register/
0
10
5
jmorris

James Morris

@pid_eins great to see this!

RE: https://mastodon.social/users/pid_eins/statuses/109959112315995623
0
0
2
jmorris

James Morris

re: CW transphobia
Show content
@ruscur depressing & just not where we should be in 2023

RE: https://ozlabs.house/users/ruscur/statuses/109964183572477416
0
0
1
jmorris

James Morris

Edited 1 year ago
Slightly longer form blog on recent #8m experiments:

https://w7txt.net/2023/03/03/adventures-in-the-8m-band/

#amateurradio #hamradio #vhf #wspr
0
1
1
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
2
2
6
jmorris

James Morris

Edited 1 year 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
1
1
3
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/
0
0
0
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: