Friends at Ettus are holding a competition, with a USRP B310¹ each to win, for authors of FOSS RFNoC blocks in the categories
- most impactful for SDR community and
- most creative.

An RFNoC block is a module on an AXI4S data bus with separate settings interface in a "shell" making interacting with the rest of the system easier, to be deployed in the FPGA of SDR devices.
Not hard to write.

https://ettusresearch.github.io/noc-shop/competition.html

¹(PCIe2.0×4 native,slot/TB3,10⁸Hz BW)
#digitaldesign #fpga #rfnoc #sdr #hardware

Don't know what this specifically is, but it's pretty – might be a case for #mothstodon (loc: forest, Upper Rhine Plane, Germany)

#lazyverse: I'm looking for a photo of direction signage that appeared on my timeline not so long ago.

It displays a Chinese blue road sign. It shows that to turn right, someone would need to basically take all but one of the right hand turns in a doubly-linked cloverleaf interchange, doing more than 500° of turning. Sign looked something like the below. Can someone point me to the photo, or even better, the post?

**EDIT**: solved; it's https://mk.absturztau.be/notes/amabrc2zz29n001m ! Thank you, @kevin !

The Software Defined Radio Academy 2026 at HAMRADIO Friedrichshafen has just announced its call for participation.

I've been there several years; SDRA is a super welcoming event, and both the hallway track and walking the trade fair are a good additional reasons to attend. Plus, the lake constance region *is* rather nice!

https://2026.sdra.io/pages/call-for-papers.html

#hamradio #sdra #cfp #callforparticipation #callforpapers #SDR

Bei feuchter Witterung sprießt der Kreisrunde Brunnenröhrling besonders zahlreich. Hier eine besonders schön kachelrot gefärbte Reihe dieser markanten Spezies in natürlichem Habitat.

hey, shot in the blue, but @mattdm , do you know whom to contact about forge throwing an anubis error when you click on the "pagure deprecation" message on any pagure page?

Tag yourself in this "Git Flow" documentation from Microsoft's training material, https://learn.microsoft.com/en-us/training/modules/introduction-to-github/3-components-of-github-flow

I'm not sure whether I'm joining whichever Tim is walking in the opposite direction of development to find the root of all this and Have A Word, please; or whether I'm in your process, doing releases from a hotfix branch.

I Wonder where the #hearingaids developers are! These would be awesome to have do a talk.
Same for the "process signal, but *fast*" people; top of my head, we've got @rygorous , but he's more on the "fast" than on the signals side. We have @mkretz who could talk about C++ SIMD stuff, but my guess: he'd prefer to talk in a room full of compileristas?
Are #EMerge #FEM/#Heavi people here? It'd seem #Sionna gets a lot of well-deserved attention combing physics+signals, but it's not the sole toolkit!

​🌅There will be an #SDR & #DSP Devroom at #fosdem26 !
Now, that makes me think about the kind of signal processing communities I'd like to see more of, a bit outside of my SDR-heavy bubble. Forwarding this to DSP communities would be very appreciated!

I like the #biosignals crowd–but there's also a "Bioinformatic" devroom.

What about DSP for audio/video? I'm sure #ffmpeg & friends have something to tell! But: there's "Music Production" and "Open Media" devrooms, which overlap somewhat.

TIL I learned: Donald Knuth is still writing books on CS, and he's dedicating chapters to analysing signals of his home pipe organ,
https://cs.stanford.edu/~knuth/organ.html

> 7.2.2-79: Analyze the sounds that are playable on the pipe organ in my home

https://cs.stanford.edu/~knuth/news.html

CC: @entropia @domrim @muccc @bert_hubert anyone of you happen to have an old-ish spare server lying around?

F-Droid is important infrastructure. Look at how quaint their main buildserver is!

That thing carries a lot of trust, playing a central role in the FOSS mobile software supply chain. Due to limited resources, however, that HW won't be able to build APKs soon, as it's stuck in the pre-x86_64v2 times (doesn't even do SSE4_2!)

I'm sure people around here have x86_64 servers w. ≥12 cores of the last 15 years lying around that's about to hit E-waste soon. Please donate it!

https://social.librem.one/@eighthave/115056869688212417

A friend of mine, Marcus Leech (of @gnuradio / @ccera.ca radioastronomy fame!), has a surplus of 110 (!) first-generation rtlsdr (before Nooelec and RTL-SDR.com arose); most R820 tuners, some E4000.

He asks for 800 US Dollars for the full lot (+shipping). Any takers?

you just have to build it less badly, i.e., less sensitive to RF interference to begin with. That mostly has to do with a) engineers actually getting smarter about this, b) things getting smaller (and a short trace is much less likely a good antenna for some frequency, c) at least two-sided PCBs getting common and amplifier ICs getting more sensible.
- "They use much narrower bands": absolute nonsense. GSM phones use a few kHz of bandwidth, 4G's bandwidths in the dozen of Megahertzes, 1000× that

This Article is doing the rounds, and technically, most of it is wrong. Somehow it's still a bit right!
- TDMA is very much still a thing; your 4G/5G phone is not emitting a continuous stream of signal, but very much bursts. But these bursts are less uniform, and at different rates, than in GSM time.
- it's not about shielding at all. It's about *susceptibility*. You don't have to shield audio (< 20 kHz) amplifers so they don't react to cellular RF (>> 1000× audio freq);
https://mindly.social/@Ranger1138/114948811761169324

hm, maybe something @funnelfiasco might have had the questionable joy of doing in practice?

FOSS community organizer mastodon:

What are the currently available options when trying to schedule meeting times that multiple parties car agree on?
DFN Terminplaner is quite OK, but for a major bug rendering it useless: it's not aware of time zones.
I can't organize a meeting when people keep correcting their availability due to TZ confusion (computers should convert between TZs. Letting users do it mentally is a recipe for disaster).

I'm not overly keen on self-hosting, but will if forced.

**EDIT**: I think I have an indirect contact. Cease your boosting :)
#infosec Has anyone in my circle a security contact at commerzbank / comdirect? I'm getting mail that me, common sense and telephone customer support agree is fishing.
Small problem: it comes from the comdirect mail server, and seems to have a valid telesec-CA S/MIME cert attesting ownership. And the content is even more worrisome.

(this is the rare "boost for reach" thing, isn't it?)

I'm a bit on the edge about Oliver Heaviside's birthday, which was yesterday. I don't think I'd have had the bandwidth to observe it, but then again, who has?

Anyways, around the time this photo was taken, Gibbs had already published a ringing endorsement for what happens when Heaviside's impulses meet the limited support in spectrum that physical systems have.

#dspjokes #scnr #mathjoke

@lcamtuf Phase velocity is 1/√(LC), so both play similar roles in determining the speed of "constant phase" travelling down the coax line.

note that in waveguides, that's faster than light; what you're looking for is the derivative of that w.r.t. frequency, the group velocity, and that's going to be always smaller than the speed of light (in vaccuum).