Posts
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Following
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Followers
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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

Reply to @jmorris
Load testing the bias power supply. The amp uses an expensive ($650) GaN transistor which must have bias applied before main power, or it will be destroyed - it’s ‘on’ by default and needs bias to switch ‘off’. I’m being extra careful with this, will also verify the power up sequence on a scope, response to short circuit etc.
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jmorris
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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

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jmorris

James Morris

Reply to @jmorris
@jtfletchbot btw, the PCB and housing is from Lothar Baier, https://texasmicrowave.com/ . Saves a mountain of busywork for me.
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jmorris

James Morris

Reply to @jmorris
Edited 1 year ago
@jtfletchbot I believe it can produce more linear power with higher voltage and aggressive cooling, but 25W will be a good start.
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jmorris

James Morris

Reply to @jtfletchbot@mastodon.hams.social
@jtfletchbot this is for a TGA2623-CP device (yet to arrive), with the aim of 25W out for about 60mW in.
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jmorris

James Morris

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

ftg

Very shiny for +50years old equipment.

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jmorris

James Morris

Reply to @azonenberg@ioc.exchange
@azonenberg love seeing the purple PCBs.
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jmorris

James Morris

@LWN they grow up so fast

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

Greg K-H

Reply to @warthog9@social.afront.org
Edited 1 year ago
@warthog9 Many thanks to you and
@monsieuricon 's work here and your continued work to keep vger alive all these years, it's one of the primary reasons that Linux development works so well.
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jmorris

James Morris

Reply to @bluca@fosstodon.org
@bluca rail travel? you are living in the future.
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jmorris

James Morris

Reply to @MLE_online@social.afront.org
@MLE_online @misternineham relatable.
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jmorris

James Morris

Reply to @va3db@mastodon.radio
@va3db at what frequency?
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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
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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
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jmorris

James Morris

Reply to @jmorris
Now using aluminum extrusions to adjust the position of the sensor & also hold it tight. Any further improvement will require a dial indicator to ensure it’s centered. And maybe some shims. Learning a lot about precision metalwork with this.
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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
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jmorris

James Morris

TIL my 50 MHz scope is still somewhat usable up to 150 MHz.
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jmorris
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pebenito@infosec.exchange

Chris PeBenito

Edited 2 years ago

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.

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jmorris
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stgraber@hachyderm.io

Stéphane Graber

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/

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