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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

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

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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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

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

Reply to
@va3db @zazzoo setting this up is easy if you can do FT8 or WSPR already, and have something as simple as a dipole for 6m. Run wsjt-x in msk144 mode overnight during this weekend and see if you catch anything. I just set this up last night and it worked. Note that signals closer than 500km are probably not MS.
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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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jmorris

James Morris

Sol, bruh.

#hamradio #amateurradio #space #spaceweather #solar #ionosphere #hf #rf
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jmorris

James Morris

Catching up on the recent SSITC security conf in France -- some is in English.

https://www.sstic.org/2023/programme/

#infosec #security #linux #opensource
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jmorris

James Morris

Excited to get this (~3rd in reading queue). Mersini-Houghton’s multiverse theory is the only one which has been tested, AFAIK.
I find it difficult to understand (e.g pre-Universe “energy landscape”) so I’m hoping the book will help.
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jmorris

James Morris

Reply to @jmorris
What is stopping you from coding like this?
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jmorris

James Morris

Reply to @jmorris
Also...
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jmorris

James Morris

Trying out the AI image generation in Powerpoint.
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jmorris

James Morris

Reply to @jmorris
@Haijo7
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jmorris

James Morris

My ideal house. #goals #hamradio #amateurradio #microwave
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jmorris

James Morris

Just looking at some code of mine from 1994, for satellite tracking, and found this optimistic gem.
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jmorris

James Morris

This is really something. #antipattern
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