A website called energy-storage dot news should not be mixing up energy and power
Readit Newspythonguython commented on 250MWh 'Sand Battery' to start construction in Finland energy-storage.news/250mw... · Posted by u/doener
pythonguython commented on Ask HN: The government of my country blocked VPN access. What should I use? · Posted by u/rickybule
There isn't enough bandwidth in HF to transmit data. Digital HF audio is 20 kHz wide so maybe 50kbps. The entire HF band is only 3-30 MHz.
I’m not familiar with any HF comms channels other than military or broadcasting that get 20 kHz of bandwidth. Most HF modes get 3 kHz. You might be able to get 5 kbps at 3 kHz BW with some modern modes that can adapt to the frequency selective non stationary channel.
pythonguython commented on Ask HN: The government of my country blocked VPN access. What should I use? · Posted by u/rickybule
Apologies for the rampant paranoia but that all sounds great - but how do I know that advice like this can be trusted, after all you could be an agent of a state security service directing people towards services they want people to use.
NB Just to be clear, I'm not doubting you, but if I was in a situation where my life or liberty was at threat I would be very worried about whose advice to take.
He’s giving advice about generic protocols - you could learn about them and make your own decision. The tools he mentioned are open source - you could read the source code or trust in the community. I don’t know what other guarantee you could hope to get. If he told you he’s an anti digital censorship expert he could just be lying to you. Anyone COULD be an agent, but at a certain point you have to choose to trust people, at some potential risk to yourself.
I frequently wonder what steps SpaceX security has to take, given the insane geopolitical significance of reusable rockets and cheap access to orbit.
Spacex rocketry tech is subject to ITAR regulations. That restricts who they’re allowed to contract with, data encryption and handling, but altogether those regulations are quite bare. It likely wouldn’t be enough to stop a state actor or rogue employees.
pythonguython commented on Two Birds with One Tone: I/Q Signals and Fourier Transform wirelesspi.com/two-birds-... · Posted by u/teleforce
Yet another thing from school I've never used in the software world.
By the way, QAM is (still) used in 4G and 5G.
Come be a DSP engineer. I take FFTs of IQ data almost every single day
It makes me sad that devs start relying on proprietary online services to be able to work. We have been lucky enough to have FOSS tools to do everything and not to have to rely on any specific service or company to work and some of us are deciding to become like Monsanto-addicted farmers who forgot how to do their jobs without something they have to pay every month.
Do you mind sharing what industry you’re in where you can fully rely on FOSS? In my industry we’re dependent on MATLAB, Xilinx tools, closed source embedded software and more. To name a few industries: game devs might be stuck with unity, finance quant devs might be stuck with Bloomberg terminals, iOS app devs are stuck with apple’s tooling etc… this isn’t just an LLM problem IMO.
pythonguython commented on It's a DE9, not a DB9 (but we know what you mean) news.sparkfun.com/14298... · Posted by u/jgrahamc
If a contractor installed exactly what he asked for, an RJ45 jack which would be unusable for his needs he would have no grounds to stand on to demand it be corrected without paying more. By specifying the technically correct name as well as the colloquially recognized name he is being precise and accommodating.
If a contract requires RJ45 terminated Ethernet patch cables and the contractor delivers keyed RJ45, they have not delivered because RJ45 doesn’t even have the correct conductor layout to act as an Ethernet cable. Contracts call for RJ45 all the time and there are no mixups. You’d probably find it quite difficult to even find vendors for keyed RJ45
pythonguython commented on It's a DE9, not a DB9 (but we know what you mean) news.sparkfun.com/14298... · Posted by u/jgrahamc
Most 8P8C other connectors are incompatible with RJ45.
Why wouldn't you say RJ45?
Well you definitely SHOULD say RJ45. We do a lot of networking at my job and if I asked for an 8P8C connector, I would get confused stares. Say Ethernet cable, Cat 6 cable (or whatever cat), or RJ45. Sometimes being correct isn’t the right thing to do.
pythonguython commented on AMD CEO sees chips from TSMC's US plant costing 5%-20% more bloomberg.com/news/articl... · Posted by u/mfiguiere
The article doesn’t say, but I assume these are SOTA AI chips? If so, it’s a huge deal that American can build them.
Another interesting point:
> AMD and larger rival Nvidia Corp. recently gained a reprieve on restrictions imposed on shipments of some types of artificial intelligence accelerators to China. It’s still not clear how many licenses will be granted — or how long the companies will be allowed to ship the chips to the country, the biggest market for semiconductors.
It sounds like they’re trying to give China some chips but not as many as American allied countries. I wonder if they’re trying to get China “addicted” to western AI chips to hurt Chinese chip manufacturing development?
They can make advanced chips in Arizona, but the bleeding edge is in Taiwan. Arizona can make TSMC’s 4nm process, but in Taiwan they’re doing 3nm and ramping up 2nm.
pythonguython commented on Time saved by AI offset by new work created, study suggests arstechnica.com/ai/2025/0... · Posted by u/amichail
And if my plane keeps the take-off acceleration up for 7 months we'd be at 95% the speed of light by then.
I imagine many people in 1970 were incredulous that we’d have transistors with 20 nm pitch width.