Hackaday Links: June 26, 2022

Jean J. Sanders

Head for the hills!! We’re all doomed! At the very least which is the impact you might get from the headlines about the monster Earth-going through sunspot this week. Even though any sunspot that doubles in dimensions inside a issue of times as AR3038 has carried out is well worth looking at, chances are rather lower that it will bring about difficulties in this article on Earth. About the ideal this class of sunspot can deal with is an M-class solar flare, which usually bring about radio blackouts only at the poles, and could present a radiation dilemma for the crew of the ISS. So no, this sunspot is likely not heading to destroy us all. But then once again, this is the 2020s, and very a great deal anything negative looks like it’s attainable.

Talking of lousy outcomes, pity the lousy Sonos clients and their ongoing fight with the company’s odd “glitches.” For what ever motive, customers have been getting shipments of Sonos merchandise they under no circumstances purchased, with at the very least just one consumer having about $15,000 really worth of merchandise transported. The customer reviews purchasing five Sonos items, but the company observed in shape to fill the buy six periods, stuffing their condominium with merchandise. Sonos doesn’t appear to be carrying out considerably to make it suitable while offering the client free delivery labels to return the items, they ended up envisioned to schlep the deals to a UPS store. And then there’s the dollars — Sonos billed the customer for all the unordered merchandise, and won’t difficulty a refund till it’s all returned.

If you’ve ever wondered specifically what the indicators heading up and down your cable line search like, you are going to want to examine out this online video from Double A Labs. Working with an RTL-SDR dongle and some spectrum analyzer software they probed the RF signals on the cable, with some interesting results. The to start with 11 minutes or so of the movie are devoted to location up the hardware and software package, despite the fact that there is some appealing stuff about broadband network architecture right up at the get started. The scans are appealing — you can obviously see the 6-MHz quadrature amplitude modulation (QAM) electronic channels. We have been amazed to learn that these get started at just about the FM broadcast band — about 108 MHz. There had been a couple of minimal surprises hiding in the spectrum, like two unmodulated analog Television set carriers in just one location, and the actuality that there are in excess of 400 virtual channels jammed into 41 6-MHz QAM channels. Broadband certainly.


On a similar be aware, we acquired a tip this week on an RF design and style sequence on YouTube that appears fairly comprehensive. It covers the basic principles, from filters and impedance matching to RF oscillators and amps. Every video clip is from 15 to 30-ish minutes prolonged, so rather digestible, and the creation high-quality is very good. You could want to verify it out if you want to get up to pace on the Dim Arts.

And eventually, if none of the over tickles your extravagant, or if you just truly want to rest, you could possibly want to commit a fifty percent-hour to viewing an analog plotter do its thing. It comes to us from our buddy CuriousMarc, who lately repaired the classic Hewlett Packard 7035B X-Y recorder, a wonderful 1960s design and style with some interesting options. Main amid these is the use of photochoppers to deal with the DC offset on the input. Marc points out it all in the original teardown and fix videos, leaving us with practically nothing but the sluggish Cartesian dance of the pen in an (virtually) never-ending Lissajous pattern. It’s really soothing.


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