Mostly ham radio, electronics, programming, microprocessors, radiation and (radio) astronomy
Joined December 2013
- Tweets 1,362
- Following 175
- Followers 1,207
- Likes 3,713
388 Photos and videos
Pinned Tweet
28 Apr 2025
The 10-hour blackout in Spain confirmed that switching power supplies have destroyed amateur radio. 10 hours of noise-free bands and extremely weak signals with crystal-clear audio. Just incredible! But everything went to hell when the power came back on.
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May 28
For all these years I believed that root was the all-powerful user who could do anything on the system. Even destroy it. I was wrong. Secure Boot is.
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May 23
I've been seeing these signals, barely 3 kHz wide and lasting half a second or less, on various SDRs and across different ham bands for weeks. They appear on random frequencies, and when you manage to hear one, it's clearly a digital signal.
Any ideas?
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Apr 14
Replacing 40 year old axial capacitors with modern tantalum with the aid of a small piece of breadboard and pin connectors
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Mar 27
From what I see in the MacBook Neo reviews, all Mac users do is edit 4K videos and browse the web with 80 tabs open at the same time. Nothing else.
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Mar 17
For some reason this 1/16A 250V fuse consists of a small 82 ohms resistor and a spring.
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Miguel A. Vallejo retweeted
Feb 17
Extracts information from radio signals via SDR devices
github.com/BatchDrake/SigDig…
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30 Dec 2025
This is the shutdown of RNE's 585 and 657 kHz transmitters in Madrid today. You can see the band is being abandoned because Europe failed to enforce its own EMC regulations. Switching power supplies powered devices are slowly killing radio
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18 Dec 2025
Average Linux experience:
Now: Your hardware is too new. Support is still experimental
5 years later: Your hardware is supported, but still has significant bugs
10 years later: Your hardware is too old. No one will bother fixing it
15 years later: Support has been removed
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10 Dec 2025
It's that time of the year again...
12 Dec 2021
This is how a small Christmas tree can kill your HF bands. Happy SWLing, if you can...
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29 Oct 2025
Fun fact: KDEConnect can crash your wifi stack under Debian Trixie with some Mediatek adapters.
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Miguel A. Vallejo retweeted
2 Oct 2025
En 1992 la guerra llegó a Bosnia. Muchas personas tuvieron que huir de la guerra y algunos vinieron a España mientras otros se quedaron allí.
¿Quieres saber cómo radioaficionados españoles tendieron puentes de comunicación?
lavozenlanoche.com
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19 Sep 2025
Seeing the evolution of chinese walkies, I think we can expect something like this by 2030.
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