LH0ezVT

joined 10 months ago
[–] LH0ezVT 1 points 45 minutes ago

Idk about you, but I hesitate to get myself killed.

[–] LH0ezVT 2 points 52 minutes ago

halt meinetwegen Englisch

[–] LH0ezVT 1 points 9 hours ago

Isn't that basically Roman weekend entertainment?

[–] LH0ezVT 4 points 9 hours ago

I don't think I could do anything to a bear that would do more than make it angry. Maybe poke it in the eye or something, if it holds perfectly still while I do that. Even then, I would just be mauled to death by a one-eyed bear that suddenly remembers it has those giant claws right there.

[–] LH0ezVT 12 points 10 hours ago (2 children)

I think part of the problem with cats is that you don't want to injure the cat, but the cat has no problem with injuring you. The stories I hear from people who dealt with panicking/aggressive cats are mostly about catching the cat without hurting it, while avoiding getting hurt yourself.

[–] LH0ezVT 2 points 21 hours ago (1 children)

Jokes aside, I think it is more that they want to attract the really good people. There already is a complete power imbalance in many science fields, and in applied fields, they will still have to compete with industry jobs.

[–] LH0ezVT 8 points 1 day ago

Wait, so every car manufacturer has already identified the problem decades ago, decided that bad press is worse than a few more dollars, and fixed it? Except the disruptive genius who knows everything? Nice.

[–] LH0ezVT 2 points 1 day ago

Signal integrity will probably be fine, you can always go with optical signalling for the long routes. What would be more of an issue is absurd complexity, latency from one end to the other, that kind of stuff. At some point, just breaking it down into a lot of semi-autonomous nodes in a cluster makes more sense. We kind of already started this with multi-core CPUs (and GPUs are essentially a lot of pretty dumb cores). The currently biggest CPUs all have a lot of cores, for a reason.

[–] LH0ezVT 1 points 2 days ago

It's been a while since I dealt with my favourite maker of totally legit Diesel ECUs that absolutely have no cheat function built in, what are they up to now?

[–] LH0ezVT 15 points 2 days ago (5 children)

As someone thinking of doing a PhD, I want those dirty foreigners and their ivy league diplomas out! They are stealing my jobs!

[–] LH0ezVT 10 points 2 days ago (1 children)

Yup. People don't care about the kids mining their cobalt. To care about the animals they eat would be a long process.

[–] LH0ezVT 5 points 2 days ago

Because the yellow press correctly figured they could sell "we are much better than those lazy foreigners". Nothing more, nothing less. As long as the average Bild reader gets to feel superior, all is well.

 

cross-posted from: https://sh.itjust.works/post/34142424

Picture from a hike back in January. I need to go outside more often ;)

 

cross-posted from: https://sh.itjust.works/post/34507515

How do you test your antenna idea? Well, our approach was to get a portable network analyzer that can show received dBm, put a commercial antenna on it, and strap the whole thing to a PVC pipe (for insulation and to get repeatable height). Then, zip-tie a cough drop to the PTT of a walkie talkie set to low power, so that it transmits continuously.

Now you can walk around your contraption with your Drain Pipe of RF measuring, and get a (rough qualitative) idea of how the pattern looks like. Much to my surprise, it actually worked.

 

How do you test your antenna idea? Well, our approach was to get a portable network analyzer that can show received dBm, put a commercial antenna on it, and strap the whole thing to a PVC pipe (for insulation and to get repeatable height). Then, zip-tie a cough drop to the PTT of a walkie talkie set to low power, so that it transmits continuously.

Now you can walk around your contraption with your Drain Pipe of RF measuring, and get a (rough qualitative) idea of how the pattern looks like. Much to my surprise, it actually worked.

15
submitted 1 month ago* (last edited 1 month ago) by LH0ezVT to c/amateur_radio
 

Picture from a hike back in January. I need to go outside more often ;)

 

cross-posted from: https://sh.itjust.works/post/29055031

My first magnetic loop for 2m :)

Really simple construction: bent ca. 2mm brass pipe soldered directly to the outside of an SMA plug, inside of the plug soldered to the red wire as "input coil". Tunable by squeezing the ends more or less close together.

SWR of <1.2 at resonance, not bad. Impedance is at roughly 44+j2 Ohm, also not bad for totally eyeballing it without any prior calculations.

I can reach the nearest 2m relais just fine at 2W, although to be fair I can do the same with a short whip antenna. More testing to follow. Holy shit, this actually works!

 

My first magnetic loop for 2m :)

Really simple construction: bent ca. 2mm brass pipe soldered directly to the outside of an SMA plug, inside of the plug soldered to the red wire as "input coil". Tunable by squeezing the ends more or less close together.

SWR of <1.2 at resonance, not bad. Impedance is at roughly 44+j2 Ohm, also not bad for totally eyeballing it without any prior calculations.

I can reach the nearest 2m relais just fine at 2W, although to be fair I can do the same with a short whip antenna. More testing to follow. Holy shit, this actually works!

 

It will widen your horizon, they said. And here I was, foolishly thinking I could get away with half-assing statistics during my degree.

424
Based on a true story (sh.itjust.works)
submitted 8 months ago by LH0ezVT to c/[email protected]
 

Turns out the status quo of Linux memory management somehow works pretty damn okay, nobody seems to really know why, and nobody cares.

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