It is hard to imagine today, but there was a time when there were several competing network technologies. There was Ethernet, of course. But you could also find token ring, DEC Net, EcoNet, and ARCNet. If you’ve never dug into ARCNet, [Retrobytes] has a comprehensive history you can watch that will explain it all.
Like token ring, ARCNet used a token-passing scheme to allow each station on the network to take turns sending data. Unlike token ring and Ethernet, the hardware setup was much less expensive. Along the way, you get a brief history of the Intel 8008 CPU, which, arguably, started the personal computer revolution.
Like most networking products of the day, ARCNet was proprietary. However, by the late 1980s, open standards were the rage, and Ethernet took advantage. Up until Ethernet was able to ride on twisted pairs, however, it was more expensive and less flexible than ARCNet.
The standard used RG-62/U coax and either passive or active hubs in a star configuration. The coax could be up to 2,000 feet away, so very large networks were feasible. It was also possible to share the coax with analog videoconferencing.
Looking back, ARCNet had a lot to recommend it, but we know that Ethernet would win the day. But [Retrobytes] explains what happened and why.
Ignoring all of the regulations, band allocations, and “best amateur practices,” there’s no real fundamental difference between the frequencies allocated to the Family Radio Service (FRS), the General Mobile Radio Service (GMRS), the Multi-Use Radio Service (MURS), and the two-meter and 70-centimeter bands allocated to licensed ham radio operators. The radio waves propagate over relatively short distances, don’t typically experience any skip, and are used for similar activities. The only major difference between these (at least in the Americas or ITU region 2) is the licenses you must hold to operate on the specific bands. This means that even though radios are prohibited by rule from operating across these bands, it’s often not too difficult to find radios that will do it anyway.
[Greg], aka [K4HSM], was experimenting with a TIDRADIO H8 meant for GMRS, which in North America is a service used for short-range two-way communication. No exams are required, but a license is still needed. GMRS also allows for the use of repeaters, making it more effective than the unlicensed FRS. GMRS radios, this one included, often can receive or scan frequencies they can’t transmit on, but in this case, the limits on transmitting are fairly easy to circumvent. While it isn’t allowed when programming the radio over Bluetooth, [K4HSM] found that programming it from the keypad directly will allow transmitting on the ham bands and uses it to contact his local two-meter and 70-cm repeaters as a proof-of-concept.
The surprising thing about this isn’t so much that the radio is physically capable of operating this way. What’s surprising is that this takes basically no physical modifications at all, and as far as we can tell, that violates at least one FCC rule. Whether or not that rule makes any sense is up for debate, and it’s not likely the FCC will break down your door for doing this since they have bigger fish to fry, but we’d definitely caution that it’s not technically legal to operate this way.
In a world of 32-bit and 64-bit processors, it might surprise you to learn that Intel is releasing a 12-bit chip. Oh, wait, we mean 12-qubit. That makes more sense. Code named Tunnel Falls, the chip uses tiny silicon spin quantum bits, which Intel says are more advantageous than other schemes for encoding qubits. There’s a video about the device below.
It is a “research chip” and will be available to universities that might not be able to produce their own hardware. You probably aren’t going to find them listed on your favorite online reseller. Besides, the chip isn’t going to be usable on a breadboard. It is still going to take a lot of support to get it running.
Intel claims the silicon qubit technology is a million times smaller than other qubit types. The size is on the order of a device transistor — 50 nanometers square — simplifying things and allowing denser devices. In silicon spin qubits, information resides in the up or down spin of a single electron.
Of course, even Intel isn’t suggesting that 12 qubits are enough for a game-changing quantum computer, but you do have to start somewhere. This chip may enable more researchers to test the technology and will undoubtedly help Intel accelerate its research to the next step.
There is a lot of talk that silicon is the way to go for scalable quantum computing. It makes you wonder if there’s anything silicon can’t do? You can access today’s limited quantum computers in the proverbial cloud.
New angles and concepts in 3D printing are always welcome, and we haven’t seen anything quite like [Horn & Rhode]’s 3D prints that do not look anything like 3D prints, accomplished with an experimental tool called HueForge. The concept behind it is simple (though not easy), and the results can be striking when applied correctly.
The idea is this: colored, melted filament is, in a sense, not that different from colored paint. Both come in various colors, are applied in thin layers, and blend into new colors when they do so. When applied correctly, striking imagery can emerge. An example is shown here, but there are several more both on the HueForge project page as well as models on Printables.
Instead of the 3D printer producing a 3D object, the printer creates a (mostly) flat image similar in structure to a lithophane. But unlike a lithophane, these blend colors in clever and effective ways by printing extremely thin layers in highly precise ways.
Doing this effectively requires a software tool to plan the color changes and predict how the outcome will look. It all relies on the fact that even solid-color filaments are not actually completely opaque — not when printed at a layer height of 0.08 mm, anyway — and colors will, as a result, blend into one another when layered. That’s how a model like the one shown here can get away with only a few filament changes.
Of course, this process is far from being completely automated. Good results require a solid amount of manual effort, and the transmissivity of one’s particular filament choices plays a tremendous role in how colors will actually blend. That’s where the FilaScope comes in: a tool to more or less objectively measure how well (or how poorly) a given filament transmits light. The results plug into the HueForge software to better simulate results and plan filament changes.
Print result, showing results of filament blending.
Tilted to catch the light, giving an idea of how the print is structured.
When done well, it’s possible to create things that look nothing at all like what we have come to expect 3D-printed things to look. The cameo proof-of-concept model is available here if you’d like to try it for yourself, and there’s also an Aztec-style carving that gives a convincing illusion of depth.
[Horn & Rhode] point out that this concept is still searching for a right-sounding name. Front-lit lithophane? Reverse lithophane? Filament painting? Color-blended bas-relief? If you have a better idea, we urge you not to keep it to yourself because [Horn & Rhode] absolutely want to hear from you.
We expect that the phone manufacturers will drag their feet just as some of them have over charger ports, but the greater ease of maintenance, as well as extra longevity for phones, can only be a good thing. There are a few other measures in the package, and one of them caught our eye, the introduction of a battery passport for larger industrial and EV batteries. There’s little more information in the press release, but we hope that it doesn’t inhibit their exploitation by people in our community when introduced.
When you talk to hackers who’ve just finished an epic project, they’ll often start off with a very familiar refrain: “I had no idea what I was getting into.” And maybe they’ll even follow up with the traditional second line “If I knew how hard this was going to be, I probably wouldn’t have tried.” And that’s from people who have just finished wiping the sweat from their brow.
Don’t get me wrong, sometimes you do get in over your head and take on more than you can chew. But let’s be honest, how often does that really happen relative to how many projects end up looking easy at first, and then end up teaching you a lot along the way, often the hard way? If you’re like me, the latter happens more than the former, and I don’t think I’m particularly clever.
Instead, it’s just the nature of learning. In the beginning, you don’t know something, so you don’t realize how difficult it is, hence the first classic line. And of course it’s going to be hard, because learning is always hard. If you knew it already, it would be easier, but it wouldn’t be learning!
Whether you get through or not depends on your own stubbornness and of course the nature of the hurdles. But whether you learn or not depends entirely on you not knowing what you’re doing in the first place.
Pay good attention to the second line in the post-hack couplet, and heed its advice. Starting off on something that you don’t already know how to do provides you with a fearlessness, and the courage to try something that you might not have otherwise dared. It’s good to get in over your head sometimes. That’s where you learn, and those are the audacious projects that end up being the most successful.
Or they end up as horrendous failures, but we’re crossing our fingers for you. Be brave! And if you can’t be brave, be incompletely informed.
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Radio trackers have become an important part of studying the movements of wildlife, but keeping one running for the life of an animal has been challenging. Researchers have now developed a way to let wildlife recharge trackers via their movements.
With trackers limited to less than 5% of an animal’s total mass to prevent limitations to the their movement, it can be especially difficult to fit trackers with an appropriately-sized battery pack to last a lifetime. Some trackers have been fitted with solar cells, but besides issues with robustness, many animals are nocturnal or live in dimly-lit spaces making this solution less than ideal. Previous experiments with kinetically-charged trackers were quite bulky.
The Kinefox wildlife tracking system uses an 18 g, Kinetron MSG32 kinetic energy harvesting mechanism to power the GPS and accelerometer. Similar to the mechanical systems found in automatic winding watches, this energy harvester uses a pendulum glued to a ferromagnetic ring which generates power as it moves around a copper coil. Power is stored in a Li-ion capacitor rated for 20,000 charge/discharge cycles to ensure better longevity than would be afforded by a Li-ion battery. Data is transmitted via Sigfox to a cloud-based database for easy access.
If you want to build one to track your own pets, the files and BOM are available on GitHub. We’ve featured other animal trackers before for cats and dogs which are probably also applicable to bison.