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Cake day: September 20th, 2023

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  • The link is currently dead, but it seems to be the official one.

    I couldn’t access their crowdfunding page either, so maybe they’re dead and gone?

    When searching for it, multiple sources mention there’s a risk of it being a scam, but it’s hard to tell:

    Update from 27 January 2025: Beware of possible fraud As user ElCanch0 writes in the comments of this article, there is a possibility that the Nexx or the upcoming crowdfunding campaign is a scam.

    On news.ycombinator.com, several critical voices point out inconsistencies. Raddish2 writes in the thread that the Liberux employees listed may not exist (he was unable to find any information online) and that the company address may be an ordinary residential building. The address given is not listed in the public cadastre, although Spain normally lists not only buildings but also their floor plans. However, user InceptTM points out that the people can at least be found on LinkedIn. Another user says that he asked around and found out that some people from the company were involved in the bank fraud of Rodrigo Rato, who was sentenced to four and a half years in prison in 2017.

    Source (Digitec.ch)

    Another source (Liliputing.com) mentioning the possibility of it being a scam.

    It’s also possible they just didn’t reach their crowdfunding goals, and had to end the project.

    If anyone here knows more about this, I’m interested!









  • Rarely do rulers actually scale from cm to 1mm. You typically need calipers to make measurements smaller than 2mm.

    I’m pretty sure most rulers and measuring tapes I’ve ever seen had 1 mm markings.

    We’re talking rulers of typically 10-30 cm marked length and made of plastic or metal, and longer measuring tapes made of either flimsy metal (in a casing with a lock-button) or those softer textile tapes.

    The only exception I can think of, that has only 1 cm markings, is a wooden 1 m teachers’ ruler made for blackboard use. But you do you with the calipers.


  • because you can break a foot into 12 inches, which is divisible by 1, 2, 3, 4, 5 (yes, still wouldn’t be irrational), and 6.

    12 ÷ 5 = 2.4
    

    Yeah, I get the idea that 12 is nicer than 10 to divide by 3, 4 and 6, but I’m pretty sure that 2.4 is an irrational number.

    Edit: Is this what makes it somewhat useful anyway?:

    2.4 × 10 = 24
    12 × 2 = 24
    

    So, for instance,

    120 ÷ 5 = 24
    

    would still be useful?








  • Regarding SDR, there’s a variety of software for different purposes, but some good starting points I can think of are:

    Gqrx is great for receiving and listening. Other options are available.

    GNU Radio was used for making Gqrx. Maybe you could make something with it too? According to themselves, it is a free & open-source software development toolkit that provides signal processing blocks to implement software radios. It can be used with readily-available low-cost external RF hardware to create software-defined radios, or without hardware in a simulation-like environment. It is widely used in research, industry, academia, government, and hobbyist environments to support both wireless communications research and real-world radio systems.

    There are also other applications made for encoding and decoding various digital modes, just like the SSTV apps for Android, but I don’t remember their names right now. I remember that some of them work by decoding the demodulated audio (e.g. audio output from Gqrx or a signal from an external source) so for some of those you will probably need some audio routing software, as these are not made for the receiving or transmitting radio but just for encoding/decoding digital modes to/from audio.

    Since I’ve only had receivers, I’m unsure what the coolest software for modulation and transmission is, but here’s at least something to get you started with SDR reception.


  • While you’re looking for a radio and waiting for it to arrive, you could prepare yourself for further exploration of SSTV modes through these two apps on F-Droid:

    SSTV Encoder

    Robot36

    Running both at the same time, you can encode, transmit (as audio), receive and decode on the same device (or on two devices that can hear each other). You could also feed the audio output into the radio you’re getting and transmit it over the air, or receive and decode other SSTV transmissions. When testing it over audio on local device(s), it’s always good fun to distort the images (as if they weren’t distorted enough already) by making weird noises over the audio signal, where different frequencies and amplitudes of course will result in different colors and patterns, depending on the mode etc.

    If you’re into computers, you could even consider buying some SDR (Software Defined Radio) transceiver instead/too. It’s basically a radio tuner you connect through USB and encode/decode through software, so you’ll be able to encode and transmit from your devices, and to receive and apply DSP, decode digital modes, listen, record or whatever you want to do with it. Note that some (like RTL-SDR) can only receive but not transmit. I believe the HackRF does both, but it’s been a while since I looked into it, and I’ve only ever had RTL-SDR-based receivers. There’s a lot to look into here!

    Btw, have you considered searching for other local or competing options instead of going straight to Amazon for a ham radio – maybe even something used that does the job? I’m pretty sure there’s plenty of used ham equipment to find on online second-hand marketplaces, ham radio groups on facebook, something related to the national member society representing your country at IARU or ask the members of some local ham radio club?

    I’ll catch your SSTV transmission or something equally as cool some day, yo!