Ramón de la Rosa Steinz

@[email protected]
17 Followers
137 Following
57 Posts
I enjoy travelling abroad, hostels & people. At work & hobbies: radio, telecommunication, electronics, bioengineering, photography, hiking... In charge of my university's ham radio ground station, so I'm curious about space & satellite tech.
Webhttps://www.tel.uva.es/~ramros
ORCIDhttps://orcid.org/0000-0002-7857-3664
Ramón de la Rosa SteinzJan 18
AkaSci 🛰️Jan 7

SpainSat NG II satellite, owned by Hisdesat and launched on 23 October, 2025, was hit by a "space particle" during orbit raising.

The extent of the damage is unknown but the Jan 2 press release says that "If necessary, SpainSat NG II will be replaced as soon as possible."

The impact occurred at 50,000 km, not LEO. 50,000 km is odd since geostationary orbit altitude = 35,786 km (42,164 km from center of earth).

Space debris or space rock?

@sundogplanets
https://www.indragroup.com/en/news/the-spainsat-ng-ii-satellite-suffers-an-external-impact-during-transfer-to-its-orbital-position

The SpainSat NG II satellite suffers an external impact during transfer to its orbital position | Actualidad | Indra Group

Indra Group, as the majority partner of Hisdesat, reports that the SpainSat NG II satellite, owned by Hisdesat and launched last October 23 from Cape Canaveral, has suffered the impact of a space particle during its journey to its final orbital position.

Indra Group
Ramón de la Rosa SteinzJan 9
~nJan 8
This is the biblically accurate way I learned how transistors work - copy taken from the original scripture.
Show threadRamón de la Rosa SteinzNov 15
@matt303 Great! The Prakticar 50 mm/1.8 is a bright & sharp stock lens & cool to play with the depth-of-field scale. The analogue metering is simple but good & fast, with long exposure metering (till 30 s. in the BX20s), so night shooting is reasonably good. Slide film is the best for my taste. Use the film winding with care: a bit rough for my taste in my BX20s and prone to wear due to the hard steel alloy used in the gears (you can see them by removing the bottom lid from the body). Enjoy it!
Show threadRamón de la Rosa SteinzNov 12
@matt303 Yep, brittle old plastics are a problem. Good luck with the restoration! Sometimes I'm able to rebuild some tiny pieces by preparing an improvised mould and refilling the cracks with two-components epoxy glue. Also, about the 6V battery for the camera, it can be also interesting to pile-up 4 cheap alkaline 1.5V coin cells: there is a cell size/thickness that fits. Have fun!
Show threadRamón de la Rosa SteinzNov 12
@matt303 I have a BX20s and some PB lenses. Some years ago I built a custom three-contact add-on for an adapter ring. For the 50 mm lens, you don't need to disassemble the entire lens (more risk to introduce dirt). Just remove the rear black plastic cover to discover four screws: you can use your fingernail. Remove the screws and you should reach the carbon plate with the cursor. I would apply a contact cleaner (a spray you can buy in an electronics shop), being careful not to spray the lens.
Ramón de la Rosa SteinzOct 17
I've just got Open Circuits https://www.opencircuitsbook.com/ by @tubetime and W. H. Oskay, reviewed by @kenshirriff so... amazing team of real aficionados! It's been on my shopping list for years, so I'm delighted to finally own it. Randomly turning the pages and checking out the guts of devices and semiconductors with high-quality photos is a real treat!
Open Circuits

Ramón de la Rosa SteinzOct 11
Daniel FischerOct 11
The #AMSAT-UK Colloquium this weekend is streaming live on https://www.youtube.com/live/yk6zI9Pbrig today and another feed tomorrow - see https://amsat-uk.org/2025/10/03/live-stream-of-amsat-uk-colloquium-talks/ for details.
AMSAT-UK Colloquium - Saturday stream

YouTube
Ramón de la Rosa SteinzOct 8
Daniel EstévezOct 8

Would you like to work in RF signal processing at Muon Space for SIGINT and RF science missions with a team of great engineers including myself? If you are eligible to work on ITAR/EAR and interested in helping us grow our cloud-based and onboard processing, my DMs are open.

Here is a link to the full job description: https://job-boards.greenhouse.io/muonspace/jobs/4777935007

RF Digital Signal Processing Specialist - Geospatial Intelligence

Mountain View, CA or Remote

Ramón de la Rosa SteinzSep 17, 2025
No Starch PressSep 15, 2025

Introducing our newest bundle. Pay what you want for 21 books worth $500+.

Join makers, builders, and hackers in building circuits, robots, Raspberry Pi projects, and secure devices that work – all guided by trusted No Starch Press authors. Every purchase supports @eff

https://www.humblebundle.com/books/electronics-for-the-curious-no-starch-books

#books #bookstodon #hardware #electronics

Ramón de la Rosa SteinzJul 22, 2025
Ken ShirriffJul 21, 2025
We obtained a mysterious box of 1960s electronics. I reverse-engineered it and with much effort, we got it running. It turns out to be a test unit for testing NASA's Up-Data Link, a system from the Apollo moon landing to control the spacecraft from the ground. Let's take a look inside... 1/n