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
@vathpela @Lyude I stopped watching all ST a couple of episodes into Disco. They wrecked it.
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jmorris

James Morris

Reply to
@kellylepo it's so hard to wrap my head around the reality of objects of this scale and energy. Just the idea of an 'ordinary' elliptical galaxy for a start...
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jmorris

James Morris

Reply to
@VE2UWY @va3db @zazzoo I haven’t listened to a repeater like that but now I will try it. I’m no expert in meteor scatter but AFAIK the Doppler shift is within the pass band overall - there is spread, possibly similar to aurora. Btw I don’t know if people realize there is measurable Doppler on HF skip, especially during solar events, when the ionospheric layers change in height.
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jmorris

James Morris

Reply to @jmorris
@va3db @zazzoo and btw, this was with no pre-amp, and a dipole for a different band.
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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

Reply to
@va3db @VE2UWY @zazzoo The ionized trail itself is not moving especially fast, which is what is used for communication.
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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
repeated
robpike@hachyderm.io

rob pike

Reply to @robpike@hachyderm.io

Or to put it another way, no one remembers what a profound clarification it was when Unix used the idea of typeless files and the uniformity of access that resulted.

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jmorris

James Morris

Reply to
@Geojoek yep, I was thinking oil might be able to sustain a higher temperature than 100C. It can, but not by much. This also doesn't need to be an insulator, of course (unlike an RF load).
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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

Reply to
@pid_eins Will this be covered at @allsystemsgo ?
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jmorris

James Morris

@stgraber Great to see! Did @LWN or anyone in the media pick up on what happened at Canonical?

RE: https://hachyderm.io/users/stgraber/statuses/110848690829500671
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jmorris
repeated
LinuxSecSummit

Linux Security Summit 🐧

Edited 1 year ago
📢 🐧 The Linux Security Summit Europe (LSS-EU) 2023 schedule is published!

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

This will be held September 20-21 in Bilbao, Spain, and is co-located with the Open Source Summit (https://events.linuxfoundation.org/open-source-summit-europe/)

Register here:
https://events.linuxfoundation.org/linux-security-summit-europe/register/
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jmorris

James Morris

Reply to
@msw yes :(
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jmorris

James Morris

@brauner This is crazy and wrong.

RE: https://mastodon.social/users/brauner/statuses/110781239093096206
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jmorris

James Morris

Reply to @jmorris
Bonus points for identifying the author of the code. Hint: his initials are LT.
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jmorris

James Morris

Reply to
@arnd officially the best answer.
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jmorris

James Morris

Wrong answers only: what does this kernel code do?

struct file *file = (struct file *)(v & ~3);
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jmorris

James Morris

Reply to @jmorris
FWIW, I’ve since learned that the patterns covering the polar areas indicate Polar Cap Absorption (PCA).
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jmorris

James Morris

Anyone else NOT planning to go see Oppenheimer? The more hype a movie has, the less I feel like watching it, especially anything science-y.

For those who’ve seen it already: is it worth seeing in the cinema?
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