May 29, 2023

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Specialists in technology

Hackaday Links: June 26, 2022


Head for the hills!! We’re all doomed! At minimum which is the perception you might get from the headlines about the monster Earth-dealing with sunspot this week. Whilst any sunspot that doubles in dimensions within a subject of times as AR3038 has finished is truly worth searching at, probabilities are quite low that it will induce troubles below on Earth. About the most effective this course of sunspot can take care of is an M-class solar flare, which typically lead to radio blackouts only at the poles, and may well existing a radiation issue for the crew of the ISS. So no, this sunspot is almost certainly not likely to kill us all. But then once again, this is the 2020s, and quite a great deal every little thing lousy would seem like it’s achievable.

Speaking of undesirable outcomes, pity the inadequate Sonos prospects and their ongoing battle with the company’s odd “glitches.” For regardless of what rationale, customers have been receiving shipments of Sonos items they under no circumstances requested, with at least a single shopper receiving above $15,000 value of merchandise shipped. The purchaser studies ordering 5 Sonos things, but the firm observed in good shape to fill the purchase six instances, stuffing their condominium with items. Sonos does not appear to be carrying out significantly to make it appropriate when presenting the client totally free shipping and delivery labels to return the merchandise, they were being expected to schlep the deals to a UPS keep. And then there’s the funds — Sonos billed the buyer for all the unordered goods, and won’t problem a refund until it’s all returned.

If you’ve at any time wondered just what the signals going up and down your cable line look like, you’ll want to check out this movie from Double A Labs. Employing an RTL-SDR dongle and some spectrum analyzer computer software they probed the RF alerts on the cable, with some intriguing effects. The initially 11 minutes or so of the video clip are devoted to location up the hardware and software package, even though there is some intriguing things about broadband community architecture correct up at the get started. The scans are interesting — you can clearly see the 6-MHz quadrature amplitude modulation (QAM) electronic channels. We were stunned to find out that these start out at just about the FM broadcast band — about 108 MHz. There were being a couple of small surprises hiding in the spectrum, like two unmodulated analog Television set carriers in a person place, and the simple fact that there are about 400 virtual channels jammed into 41 6-MHz QAM channels. Broadband certainly.

On a connected note, we got a tip this 7 days on an RF design collection on YouTube that appears really in depth. It addresses the basics, from filters and impedance matching to RF oscillators and amps. Every single video clip is from 15 to 30-ish minutes very long, so fairly digestible, and the creation high quality is very good. You might want to check out it out if you need to have to get up to speed on the Darkish Arts.

And eventually, if none of the previously mentioned tickles your fancy, or if you just truly want to rest, you might want to devote a 50 percent-hour to watching an analog plotter do its detail. It arrives to us from our good friend CuriousMarc, who a short while ago fixed the vintage Hewlett Packard 7035B X-Y recorder, a attractive 1960s style with some interesting characteristics. Chief amid these is the use of photochoppers to deal with the DC offset on the input. Marc explains it all in the original teardown and restore films, leaving us with very little but the slow Cartesian dance of the pen in an (pretty much) hardly ever-ending Lissajous pattern. It is very calming.


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