zh3

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241.
Horn antenna that discovered CMB saved from developer(tapinto.net)
2 points by zh3 3y ago|1 comments
242.
by zh3 3y ago
The Holmdel antenna used by Penzias and Wilson to discover the cosmic microwave background has been saved from a developer who bought the land it stands on.
243.
by zh3 3y ago
Not generally known, but Radio 4 on LW is a highly stable frequency reference and also [0] carries a digital time signal (along with other broadcast data, like signals for electricity meters). It's done by phase-modulating the carrier
244.
by zh3 3y ago
Nordic is easily the best way for BLE/ANT+, however now even they are bolting on WiFi (for non-power-limited cases). For standard profiles there's generally an example in the SDKs.
245.
by zh3 3y ago
IIRC, last time I looked at this you needed special permissions to do anything outside the box with bluetooth on Apple. It's technically straightforward on linux, or using a BBC microbit (there is example code in the Nordic SDK).
246.
by zh3 3y ago
Thanks for the link, plays into a thought about how far Disney's effect on copyright extends to open source.
247.
by zh3 3y ago
It just struck me that using Disney character names (given Disney's record on copyright) for Debian suddenly feels jarring? (saying that as a 20+ year linux verteran).
248.
by zh3 3y ago
Also known in a derogatory fashion [0] as "adding epicycles" (after the Ptolemaic view of the heavens). [0] https://en.wikipedia.org/wiki/Deferent_and_epicycle#Bad_scie...
249.
by zh3 3y ago
For Europe generally - and the UK in particular, where the seas around it act as a natural temperature buffer - yes, it's would likely get quite a lot colder. Take a look at how the temperature average and variations in NYC at ~41 degr
250.
by zh3 3y ago
I rather agree; it's the sort of instructions given to juniors. It'll all really kick off when the instructions are being handed out by the AI.
251.
by zh3 3y ago
From Nordic Semi (nrf52 chips behind most BLE/ANT+ implementations these days). Seems microwave ovens use the + side of the tolerance (2.45+0.5_ so they suggest sticking to 2.40 to 2.48 (channels 1 to 80 in their parlance).
252.
by zh3 3y ago
Interestingly, although my Firefox ESR passed the test, that page immediately made my laptop's fan spin up (normally only does that on media-heavy pages) - possibly thr "proof of work" test they mention in the article?
253.
by zh3 3y ago
Microwaves typically run 2.500GHz, most bluetooth and wifi is from 2.400 to 2.480GHz to keep some space between them (so if you want to minimise WiFi/Microwave issues on 2.4Ghz, use a low WiFi channel). Bluetooth is adaptive and will h
254.
by zh3 3y ago
We've synchronised multiple Pi's to fractions of a millisecond, with flash systems with accuracy in the microseconds for specialised motion capture. Happy to discuss if you're interested - I'm on <hn username> at
255.
by zh3 3y ago
Reminds me of a fully-analogue approach to generate arbitary waveforms using a cardboard template stuck to the front of an oscilloscope. Basically, cut out the desired shape, stick it on the 'scope and point a photocell at the screen.
256.
by zh3 3y ago
Back in the day, terminal emulators were fast enough that they were up to date by the time each 50Hz/60Hz period came around - why on earth are they now so much slower? A couple of days ago I spent a while trying to figure out why a pi
257.
by zh3 3y ago
Polar heart rate monitors work very well; a lot of them also have "5Khz" output which cuts out the whole bluetooth/ANT+ stack - basically they send out a short range inductive pulse at 5KHz on each heartbeat. For a simple dem
258.
by zh3 3y ago
Cat decides you.
259.
by zh3 3y ago
I can assure there is and it's a positive correlation. Single data point/anecdatum and all that but I dont see myself as stupid and my lolcat collection is appreciating nicely thank-you.
260.
by zh3 3y ago
Comes with grit.
261.
by zh3 3y ago
Also it appears each reload is chargeable - so anyone who wants to make your life hard can trivially run up your bill (alternatively, pushes the cost and complexity of avoiding such attacks down to anyone trying to provide a service built o
262.
by zh3 3y ago
I recall a theory that we do it because of our arboreal lineage. When apes moved into the trees to get away from predators, they would often carry things in their mouth (using their tongue to hold them) so leaving their forelimbs free for t
263.
by zh3 3y ago
When they were building the M25 motorway around London (about 120 miles for the loop) there were large sections that were built and not yet open to the public - much fun was had on fast motorbikes late at night! Though once the whole thing
264.
by zh3 3y ago
You are very likely right; every few years I look it up to see what's happened to such a large chunk of undeveloped land right next to one of the main A roads into London. Here's the current first hit on Google (for me):- https:
265.
by zh3 3y ago
I stumbled across Wisley Airfield [0] one day - very strange, doing a long bike ride across London, I plotted a route that avoided main roads and suddenly found myself in the middle of a mile-long runway. Right next to the A3 and RHS Garden
266.
by zh3 3y ago
Agreed, the eye tracking itself is really a mostly-solved problem (Tobii are indeed leaders in the area). It's how it's used that matters - and as mentioned above, it's likely that it's the usability/interface tha
267.
by zh3 3y ago
Sort of related, 'du | sort -n' to figure out what's using the space.
268.
by zh3 3y ago
Yes, most people don't care enough to fight back. So it's down to the few who do care enough to do it - and keep on doing it. Iggy Pop ('Main Street Eyes'): Boy, I feel so outgunned today But I'll get up and f
269.
by zh3 3y ago
There are plenty who care (and by no means are all of them in tech). In the UK, you could consider joining Liberty [0] who have had some significant wins. Here's an example [1] where EFF, Liberty and others were (and still are) defend
270.
by zh3 3y ago
Ti have long had "little logic" for this kind of thing (I've been out of that game for a while, maybe something has taken its place?) 2018 link (PDF): https://www.ti.com/lit/pdf/scyt129

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