tjohns

27 ms·

331.
by tjohns 4y ago
> Everything comes instead of something else. Not everything is zero-sum. Sure, it takes effort to wire up every home for Gigabit, but on the other hand you're employing more telco workers to run the cables, creating more jobs. Giga
332.
by tjohns 4y ago
Aviation uses HF as well, for communications with ATC on oceanic routes. (Many airplanes on those routes now have satcom as well, though it's not a requirement.)
333.
by tjohns 4y ago
Those are the ISM frequencies, not specific to LoRa. Basically an unlicensed wasteland of RF where anything goes, as long as you stay below a certain transmit power level. I guarantee this device (made in the the 90s) is completely incompat
334.
by tjohns 4y ago
If you look at the data [1], the majority of aviation accidents are caused by pilot error (poor takeoff/landing technique, not accounting for density altitude, improper W&B, improper fuel management, flight into bad weather, etc).
335.
by tjohns 4y ago
On the flip side, people who are overweight are already on the road to T2 diabetes. Obesity isn't just a cosmetic issue, it is a disease with very real health implications. If behavior modification doesn't work to lose weight, we
336.
by tjohns 4y ago
If you're living a healthy lifestyle, then you probably don't need pills to lose weight. We know diet and exercise (with an emphasis on the diet) will yield weight loss, if it's maintained. However, that's a big if . Be
337.
by tjohns 4y ago
I've been meaning to play with D-Star DD mode on 23cm (1.2 GHz). Supposedly supports native TCP/IP, with Ethernet out from the back of compatible radios. Not many radios have it, but the IC-9700 does have support.
338.
by tjohns 4y ago
Some modern radios have remote control software available. For example, Icom has software specifically for their radios: https://www.icomamerica.com/en/products/amateur/hf/rsba1/def... For radios th
339.
by tjohns 4y ago
> Was there ever a missed approach due to a cell phone not being in air plane mode? How was the cell phone located? Here's a story of an interference event where they went missed: https://www.quora.com/On-my-last-fli
340.
by tjohns 4y ago
It makes a bit more sense when you take into account mitigation strategies for each hazard. - If somebody has a weapon in an aircraft and is intent on using it, it's unsafe, and there's not a whole lot that can be done. You'r
341.
by tjohns 4y ago
Lufthansa runs a micro-cell onboard the aircraft. You're connected to a single dedicated cell tower inside the airplane, not to stations on the ground. No handoffs involved. (The airplane's micro-cell will then have a backhaul ove
342.
by tjohns 4y ago
The interference I experienced was just a couple years ago, from an LTE handset. It had fallen back to 2G mode due to the weak signal at altitude. As I understand it (and someone more versed in cellular backends can correct me), the reason
343.
by tjohns 4y ago
I find it interesting how most of the comments focus around maintaining quiet on the aircraft, and very little about the technical details behind this rule (interference with communications radio, interference with ground-based navigation s
344.
by tjohns 4y ago
It's not for NEXRAD. The frequencies in question are used for Terminal Doppler Weather Radar (TDWR), which is a special radar used for detecting windshear and higher resolution precipitation data at select airports. See: https:/&
345.
by tjohns 4y ago
This is incorrect. Wifi systems that don't comply with DFS show up brightly on the radar display. Here's an example from a real-world system of what a misbehaving 5 GHz AP looks like: https://journals.ametsoc.org/v
346.
by tjohns 4y ago
"Any sufficiently advanced technology is indistinguishable from magic." - Arthur C. Clarke Of course it's not "magic", obviously. But it impressive technology, and it does delight users. It's taking something t
347.
by tjohns 4y ago
Nuclear power plant. Workers would wear those uniforms while on site so that they don't track any stray radioactive particles home on their street clothes.
348.
by tjohns 4y ago
Electronic submission still involves uploading a PDF, which has to follow the court's rules for layout of printed pages. It just means it the file gets directly added into the case's docket, rather than having to be manually scann
349.
by tjohns 4y ago
Student pilots today are still taught to navigate via dead reckoning (compass and stopwatch) and pilotage (looking out the window and identifying prominent landmarks). Even at night, a pilot would have a pretty good idea where they were bef
350.
by tjohns 4y ago
My building uses motion-controlled lights. I think they switch themselves off after about 15 minutes of no motion... so about 15 minutes.
351.
by tjohns 4y ago
Windows supports SLAAC+RDNSS, as long as you're running Windows 10 or newer.
352.
by tjohns 4y ago
SLAAC does DNS, with the RDNSS extension enabled. (RDNSS is a feature that was added to SLAAC.) Some older devices [1] do not support RDNSS. I haven't run into them, but if you're at all worried about it, you can run DHCPv6 in par
353.
by tjohns 4y ago
What? No. You connect a device, and SLAAC (and optionally DHCPv6, on enterprise networks) configures everything. It just works. SLAAC is more than capable of sending DNS settings to devices. There's no manual configuration involved.
354.
by tjohns 4y ago
SLAAC can configure DNS automatically (via RDNSS). Or you can run DHCPv6 just to hand out DNS settings (or anything else you want more control over), even if it's not handling addressing. But this isn't necessary for small deploym
355.
by tjohns 4y ago
In general... yes, they very much are. "Seat pitch" is the term you're looking for, and the airlines have been steadily reducing the seat pitch over the last ~decade to squeeze in an extra few rows. Some airlines are notably
356.
by tjohns 4y ago
If you're not familiar with the term, look up "clear-channel station". (Not to be confused with the advertising company of the same name.) https://en.wikipedia.org/wiki/Clear-channel_station https:&#x2F
357.
by tjohns 4y ago
The wireless carriers wouldn't be able to do anything with the AM broadcast band. It's in the MF range - not useful for cellular at all due to limited bandwidth, giant antenna requirements, and ionospheric bounce.
358.
by tjohns 4y ago
You're talking apples and oranges. FM is absolutely better sound quality than AM. That's why music is mostly on FM. (On the other hand, AM uses less bandwidth and travels farther, since it's in the MF band and can bounce off
359.
by tjohns 4y ago
It's worth noting that SAP Concur wasn't designed by SAP. They acquired it. It's had some minor UI tweaks since, but for the most part is unchanged from the pre-acquisition product.
360.
by tjohns 4y ago
Personally, I'm comfortable diving with one computer... provided I also have an analog SPG (as a backup for an air-integrated computer) and run the dive tables on paper as well. If the dive computer fails, I just revert to paper.

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