Posts
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Following
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358
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

@BayesForDays I'm trying to embrace the chaos

RE: https://lingo.lol/users/BayesForDays/statuses/111064352222933179
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jmorris

James Morris

@mcdanlj I'd read that spiral flute taps are weaker and more likely to break for small taps, so I haven't tried them yet. Thanks for the pointers!

RE: https://social.makerforums.info/users/mcdanlj/statuses/111060149655556379
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jmorris

James Morris

co-signed

RE: https://mastodon.hams.social/users/kelvin0mql/statuses/111058628675406531
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jmorris
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KernelRecipes@fosstodon.org

Kernel Recipes

The start of the conference is coming very soon! in the meantime we are fine-tuning the last details and we are very very happy to see you again very soon !

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jmorris

James Morris

Metalwork for the linear amp is going GREAT. First I drilled the wrong hole sizes for the heat sink, then broke two 4-40 taps. Will figure out how to extract these then try a thread forming tap instead of a cutting tap.

#hamradio #amateuradio #electronics
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jmorris

James Morris

Weekend goal: get the metalworking started for the HF/6M amplifier project. kW+ RF deck by W6PQL. #amateurradio #hamradio #electronics #radio #meteorscatter
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jmorris

James Morris

Edited 1 year ago
Anyway, something good -- found a building full of electronics stores in Singapore a couple of weeks ago. So much stuff you don't see on shelves in the US or Australia now, all kinds of niches.

Location is Sim Lim Tower.

#electronics #singapore #hamradio #amateurradio #maker
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jmorris

James Morris

You realize that the Fediverse or Threads or bsky could be the new Twitter by next week, right? If a moderate handful of major celebrities and their sponsors got together and jumped to one of these, it would start an avalanche.
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jmorris

James Morris

@Lee_Holmes This is crazy, even for CVE

RE: https://infosec.exchange/users/Lee_Holmes/statuses/111020887472163544
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jmorris

James Morris

The web site for the 2024 Microwave Update (MUD) is up: https://www.microwaveupdate.org/Home

Dates: 3-5 October 2024, in Vancouver, BC, Canada.

#hamradio #amateurradio #radio #microwave #vhf #electronics
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jmorris
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Stormgren@obsidianmoon.com

Stormgren

There is zero shame in buying preassembled boards, modules, jacks with presoldered wires attached or anything like that. Or kits with all the surface mount work done for you.

There's a lot of great options for constructing things from modules and cable harnesses out there these days, and if it's the easiest way to build the project you're envisioning, go for it!

This is especially true if you are unable to solder or do fine detail work well!

At the end of the day, you still made something, and it's yours.

(Also, if you think I solder all of my own connectors and surface mount stuff, you'd be wrong)

Yes, this is a subtoot based on DMs and conversations that have happened over the past few months where folks have commented to me that they don't feel like they're doing real hardware hacking because they're not designing their own PCBs or soldering every wire or something.

Just go out there and make things!

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jmorris

James Morris

@coolandnormal relatable!

RE: https://aus.social/users/coolandnormal/statuses/110995200171355092
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jmorris

James Morris

Troubleshooting a Tek spectrum analyzer PSU. Gonna need a bigger boat. I mean, an ESR meter.
Any recommendations on a budget ESR meter? 🤔
#electronics #hamradio #amateurradio
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LinuxSecSummit

Linux Security Summit 🐧

Edited 1 year ago
A new batch of Linux Security Summit stickers has arrived! These will be distributed at upcoming conferences, starting with LSS-EU in a few weeks. There's also now a "Europe" 🇪🇺 version of the sticker.

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

#linux #security #lss #linuxsecuritysummit #lf #linuxfoundation #infosec
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jmorris

James Morris

Edited 1 year ago
Best meteor scatter rx so far: 1127 km. With just a dipole & preamp on 6m.

#hamradio #amateurradio #msk144 #meteorscatter #meteors #meteor #space #physics #rf #radio
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jmorris

James Morris

Definitely living in the future here -- using AI to write code for a quantum computer.
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jmorris

James Morris

The local electronics store (Vetco) is an Aladdin's cave of test equipment at the moment.
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jmorris

James Morris

Edited 1 year ago
Overnight meteor scatter rx haul on 6m, longest distance so far.

#hamradio #vhf #msk144 #6m #meteorscatter #perseid #meteors #space #amateurradio #wsjt-x
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jmorris

James Morris

Finally completed the initial version of 'fp_util', which allows you to control & monitor an Eltek Flatpack2 power supply, using an Arduino with a CAN bus shield.

https://github.com/xjamesmorris/fp_util

These PSUs are intended for telecoms racks, as chargers for 48v batteries, and supply 2kW or 3kW. Surplus units are useful for LDMOS RF amplifiers, and EV / e-bike etc. battery charging.
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jmorris

James Morris

Load testing my 50v power supply project, using a cheap hot water heater element in water (briefly, < 1 min). Dissipates about 350W. I’m thinking about mounting it into an empty paint can which can hold several gallons. Anyone know if mineral oil would be better than water for this?
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