Álvaro Costa

https://mastodon.chabal.es/@cosstab

I touch computers and enjoy fixing electronic stuff. Amateur radio operator. Learning Japanese.

I'm also interested in VR and VTuber tech, and have some ideas around decentralized VR worlds.

From Murcia, Spain 🇪🇦 (posts usually in English).
'98

I'd like to make a living developing Free Software. I have some projects that I made in order to learn about P2P, WebRTC and Rust.

#VR #SmolWeb #HamRadio #ShortWave #Linux #electronics #vtubers #fedi22

Pronouns: he/him
P2P stream project: https://codeberg.org/cosstab/xtream
More projects on Codeberg: https://codeberg.org/cosstab/

Public Key

npub18ueax20x2xn8ntz3cg0xya4pjf493a3efuep9gd8q0eyylqtgaeslu5vtk

NIP-05 Address

cosstab_at_mastodon.chabal.es@momostr.pink

Profile Code

nprofile1qqsr7v7n98n9rfne43guy8nzw6sey6jc7cu57vsj5xns8ujz0s95wucppamhxue69uhkummnw3ezumt0d5q3gamnwvaz7tmjv4kxz7fwv3sk6atn9e5k72vltgm

Publishing to

nostr.mom

relay.damus.io

nos.lol

Author Public Key

npub18ueax20x2xn8ntz3cg0xya4pjf493a3efuep9gd8q0eyylqtgaeslu5vtk

Show more details

Published at

2026-10-26T06:31:25Z

Kind type

0 Metadata

Event JSON

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Last Notes

2026-10-17 18:29:26 UTC

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Ohh interesting, I didn't know that about Btrfs.
But these are FFS partitions (it's an OpenBSD machine). So I made some research and found this:
https://forums.freebsd.org/threads/understanding-negative-storage-space.28325/
Apparently FFS/UFS partitions reserve a percentage of the storage, so 101% of capacity means that some of that reserved space got written.

2026-10-16 23:49:25 UTC

HOW
https://mastodon.chabal.es/system/media_attachments/files/117/453/258/178/583/485/original/4cbf5d6b4ddc2111.png

2026-10-04 16:44:42 UTC

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I thought the next ISS pass was at 19 but it was at 18 🙃
I made an antenna upgrade, but I won't be able to test it until tomorrow.
The new antenna didn't have a reflector, so I added one made of measuring tape, tuned to 440MHz.
https://mastodon.chabal.es/system/media_attachments/files/117/383/630/317/195/413/original/4d6e40e284f62684.jpg

2026-10-04 11:16:35 UTC

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Example of yesterday's reception. I record it with my phone's microphone, and then decode it using YONIQ on PC.
https://mastodon.chabal.es/system/media_attachments/files/117/382/338/601/779/404/original/3eea31b924315d16.mp4

2026-10-04 11:06:42 UTC

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These are images that I managed to receive yesterday in 2 passes, with the rubber ducky antenna of the walkie. The best pass was at 65º of elevation.
https://mastodon.chabal.es/system/media_attachments/files/117/382/259/679/424/844/original/2ce67b56d1c9572d.jpg
https://mastodon.chabal.es/system/media_attachments/files/117/382/259/831/047/856/original/ec0df220fef276f2.jpg
https://mastodon.chabal.es/system/media_attachments/files/117/382/259/948/324/735/original/557de81ae0d98384.jpg

2026-10-04 10:50:54 UTC

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I could only receive this image on the first good pass of the day. I have another opportunity this evening.
https://mastodon.chabal.es/system/media_attachments/files/117/382/160/035/181/951/original/f3d9e376c6ba0d91.png

2026-10-04 10:25:51 UTC

Today's setup for receiving images from the International Space Station.
I used a TV antenna that was cut in half, for it to not be very visible when it was being used as a TV antenna on a balcony XD.
It doesn't have much directivity as a consequence.
#HamRadio #ISS #SSTV
https://mastodon.chabal.es/system/media_attachments/files/117/382/107/900/102/648/original/552637368169c74d.png

2026-05-11 04:00:49 UTC

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RE: https://mastodon.chabal.es/@cosstab/116416533229367668
@npub19wj…g8gs reminds me of the problems I had with my Ryzen 1600. At first I thought it was a problem of the GPU, because when my PC freezed, I could see artifacts on the screen. AMDGPU drivers would randomly crash too...
VR also randomly stopped working when connected via USB, but I don't know if that's solved.
#note1hsw…8uh7

2026-04-24 06:01:42 UTC

Car fixing car
https://mastodon.chabal.es/system/media_attachments/files/116/458/147/146/786/136/original/5847747623bf46ff.jpg

2026-04-18 17:14:31 UTC

I see people worried about the end of support for the Fairphone 3.
I can still find parts for my HTC U12+, which is an older phone (2018) that almost nobody bought. So I was about to say that Fairphone owners shouldn't have to worry, until I looked for parts for them and... I couldn't find batteries on Aliexpress...
Maybe they should have to worry 😅

2026-04-16 21:35:23 UTC

RE: https://mastodon.chabal.es/@cosstab/116148001150409334
After more than 1 month I can say that my Ryzen 1600 is stable now. Unstable idling fixed!
The solution for me was to set the "Power Supply Idle Control" to "Typical Current Idle" in UEFI settings. Apparently that forces the CPU to not enter the lower power states, where it crashed.
Thanks to @npub1lsk…66t9 and all the people who commented!
#note1arn…njdz

2026-03-23 01:02:07 UTC

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yeah that's very sad 🙃

2026-03-23 00:57:01 UTC

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even if cell towers have batteries/generators, when the blackout in Spain happened, they got overloaded very quickly. So even if you had signal reception on your phone, you couldn't use it to check the news.
Luckily, I had intermittent access most of the day, but lots of people in big cities had no internet from minute 0.

2026-02-28 11:24:09 UTC

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ohh I didn't know about that setting. It was on "Auto" and I just set it to "Typical Current Idle".
I was wondering if the problem was related to idling, because it doesn't freeze when playing games. So this makes sense.
Unstable idling, like car engines...
Let's see if it works. Thank you so much!

2026-02-28 10:31:53 UTC

Anyone knows about first gen Ryzen CPUs failing?
My PC with a Ryzen 5 1600 randomly freezes about once per day.
I've tried: different pw supply, different motherboard, different GPU, disconnecting my secondary HDD. I individually tested each of the 2 RAM sicks. I also left Memtest running all night, but no errors.
It happens on Linux and Windows.
What's left to try is changing the (in theory, good) RAM modules or... the CPU.
The funny thing: my friend with a 1500X has the same problem now.

2025-10-13 10:47:19 UTC

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igual xd

2025-10-13 10:32:58 UTC

Hoy en Álvaro Se Queja De Cosas:
Que las páginas web de los ayuntamientos sean el blog personal del alcalde me fascina.
Me entero ayer por la noche (de chiripa por un post en Fedi) de que el agua del grifo no es potable.
(Yo llevaba usando agua normalmente todo el día, y hoy me he levantado con el estómago revuelto, así que tremendo, pillo bicho xdd).
Miro la web del municipio por si hay algo de info: Alcalde va a X sitio, Alcalde va a Y.
Miro carm.es: Lopez Miras va a X, L.Miras va a Y.

2025-09-28 12:39:56 UTC

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Like, that makes it repairable which is cool. But I would like to see a market full of open source printers, like what happened with 3D printing. This license only allows them to sell the printer.

2025-09-28 12:34:34 UTC

Meh "Open Printer" but with a Non Commercial Creative Commons license.
https://www.crowdsupply.com/open-tools/open-printer

2024-11-14 15:33:23 UTC

Did I create the ultimate tool to watch anime with friends?
:blobcatuwu:
xtream is a website where you can "upload" any video and watch among other people, without loss of quality.
Files are transferred privately via a P2P connection, without going through my server.
Each user can choose their preferred audio and subtitle language. Without installing programs or extensions.
🧵
#P2P #FOSS #Rust #OpenSource #WebRTC
https://mastodon.chabal.es/system/media_attachments/files/113/482/021/061/293/366/original/32be021dc3be34bb.mp4