Author | Lightnews

Reposted

Daniel Estévez @destevez.net · 5d

New blog post: Non-coherent m-FSK BER. Another short post in which I derive the following formula for the symbol error rate of non-coherent m-FSK and validate it using simulations. destevez.net/2025/10/non-...

A formula of the symbol error rate for m-FSK. It is a summation with m - 1 terms that contains a binomial coefficient and an exponential term that depends on the Es/N0.

A plot showing the BER versus Eb/N0 of m-FSK for m=2,4,8,16,32. The results using the closed-form formula and simulations are compared.

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derekkozel.com @derekkozel.com · 13d

Yes. I enjoyed the way I was taught HDL and think it would make a great basis for a puzzle solving game.

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Catherine @whitequark.org · 13d

if i published a game on steam that consisted of a "code editor and HDL toolchain behind it (simply works)" & the objective is "implement logic in a real HDL without handrails but with debugger and tutorials" and there is a progression, leaderboard, and achievements

would you play or playtest it?

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hforsten @hforsten.com · 23d

New blog post: Synthetic aperture radar autofocus and calibration.

Synthetic aperture radar autofocus and calibration

3D trajectory position error estimation autofocus, antenna pattern normalization, and polarimetric calibration for drone mounted SAR radar.

hforsten.com

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Andrey @spirit.re · Sep 29

Have you ever wanted to see a 90 second abridged explanation of how diode lasers work? Here it is.
I took some pictures of a laser under my SEM, and it kind of just scope crept into a whole video. Not perfectly accurate, but it's hard to squeeze 100 books of info into 90 seconds.

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Radiotelescoop Dwingeloo @radiotelescoop.bsky.social · Sep 29

Knap mistig in Dwingeloo!
Foto: Arno Schoenmakers.

Radiotelescoop Dwingeloo in de mist, met een zon die door de mist heen schijnt.

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derekkozel.com @derekkozel.com · Sep 27

The basket expiration time was shorter than the time it was taking to load the next page... painful. We had two tickets and a campervan in the basket and couldn't submit our account information before it expired!

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FOSDEM @fosdem.bsky.social · Sep 19

FOSDEM 2026 - FOSDEM 2026: 31st January and 1st February

Brussels / 31 & 1 January 2026

fosdem.org

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AMSAT-DL @amsat-dl.org · Sep 6

💥Greater (partial) success for #amateurradio and #amsat satellite operators in dispute with AST Spacemobile over commercial use of the 430-440 MHz amateur radio band for TT&C! 💥 In its reference Attachment to the recent grant, dated August 29, 2025, the FCC imposes clear limits ⬇️

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dr lee cyborg @leeborg.bsky.social · Aug 14

Ok let me rephrase this. Games (or puzzles) that use (or misuse) pointers (or other things I don't understand ) as a mechanic.

dr lee cyborg @leeborg.bsky.social · Aug 13

Are there any games about accessing out of bounds memory on microcontrollers ? Like I'm imagining doing some things in C to intentionally access unallocated memory to print some specific result. Am I making sense ?

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derekkozel.com @derekkozel.com · Aug 14

One of the best homeworks I was ever assigned is the CMU Bomb lab. You would need to compile and set it up, but the source code has been leaked. Don't peak inside the bomb itself, spoilers!

github.com/kiliczsh/cmu...

GitHub - kiliczsh/cmu-binary-bomb: Carnegie Mellon University Bomb Lab

Carnegie Mellon University Bomb Lab. Contribute to kiliczsh/cmu-binary-bomb development by creating an account on GitHub.

github.com

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Martha Wells @marthawells.com · Jul 18

If you missed it, there's a new Murderbot short story at: reactormag.com/rapport-mart...

Rapport: Friendship, Solidarity, Communion, Empathy - Reactor

Perihelion and its crew embark on a dangerous new mission at a corporate-controlled station in the throes of a hostile takeover… Novelette | 7,540 words They were still three hours out when Perihelion...

reactormag.com

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derekkozel.com @derekkozel.com · Jul 30

The Australian GNU Radio Days event is running September 23-26 in Adelaide, hosted by Flinders University. Three days of talks and workshops followed by breakouts.

Still a little time to submit a talk or booth if you're interested!
events.gnuradio.org/event/27/

derekkozel.com @derekkozel.com · Jul 26

GNU Radio is looking for a contractor to either port the existing Qt based GNU Radio Companion application to the web (running proof of concept exists), or to develop a new frontend capable of creating flowgraphs, executing the resulting program, and displaying the UI in the web.

Could that be you?

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Electromagnetic Field @emfcamp.bsky.social · Jul 20

We are finally ready to announce that EMF 2026 will happen on July 16-19, 2026, at Eastnor Castle Deer Park, Herefordshire.

Expect more updates soon as we start spinning up the organisation again.

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derekkozel.com @derekkozel.com · Jul 3

@angadh.com I really like the formatting of your blog. The typography, suggested soundtracks, clear links, and organizations work well together. I'm enjoying the variety of topics as well. Thanks for sharing your writing!

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Great Scott Gadgets @greatscottgadgets.bsky.social · Jun 24

Meet HackRF Pro! HackRF Pro is a Software Defined Radio peripheral capable of transmission or reception of radio signals from 100 kHz to 6 GHz.

You can read more about HackRF Pro and preorder it now from select resellers here: greatscottgadgets.com/hackrf/pro/

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Harry Stranger @spacefromspace.com · Jun 17

A new image of the International Space Station from another satellite captured by heospace.com 2025-06-14 21:28:56 UTC.

The picture has a resolution of 18cm from a distance of 85.77km.

A black and white image of the International Space Station captured via a satellite by heospace.com 2025-06-14 21:28:56 UTC.

The picture has a resolution of 18cm from a distance of 85.77km.

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Reposted

hforsten @hforsten.com · Jun 1

Found motivation to write some SAR processing code. Fast factorized backprojection generates several small polar format images and then interpolates them to one big image. It's faster, but has slightly worse image quality due to all the interpolations.

Global backprojection vs fast factorized backprojection image quality. The biggest difference is larger sidelobes on the brightest target in the FFBP image.

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derekkozel.com @derekkozel.com · May 12

Your blog posts are always great reads. Would you consider writing one on measuring these references and calculating the coefficients? Claudio's site is a good reference on coefficient calculation and it would be interesting to see your take on it.

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handle.invalid @handle.invalid · Mar 17

GRCon25 Call for Participation is open! Please submit your abstracts for presentations, papers, workshops - all the information available at gnuradio.org/grcon25

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hforsten @hforsten.com · Mar 8

I added a sideways looking GoPro camera to my radar drone. Just tested it the first time and it looks very nice.

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Daniel Estévez @destevez.net · Mar 5

New blog post: BGM-1 Doppler during the lunar landing. Some quick plots of the Doppler of @firefly-aerospace.bsky.social's lander as received by the @amsat-dl.org and @radiotelescoop.bsky.social groundstations.

A plot of the Doppler curve of the S-band telemetry as observed by Bochum and Dwingeloo. We can see a part of one orbit, all the powered descent, and the manoeuvres for landing.

A zoom to a region of a few minutes around the touchdown. The Doppler increases smoothly until becoming almost constant. This is typical of a smooth vertical deceleration that finishes with ground contact.

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KiCad EDA @kicad.org · Feb 20

KiCad Version 9.0.0 Release

The KiCad project is proud to announce the latest major version release. See the blog post on the KiCad website for more information about this release.

www.kicad.org/blog/2025/02...

Version 9.0.0 Released

The KiCad project is proud to announce the release of the next major version of KiCad. Version 9 is packed with new features, improvements, and hundreds of bug fixes. We hope you enjoy the new versio...

www.kicad.org

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hforsten @hforsten.com · Nov 24

Hello Bluesky!

Follow for homemade radars, RF electronics, FPGAs, programming, and other electronics related things.

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