I’m a programmer and amateur radio operator.

  • 7 Posts
  • 25 Comments
Joined 1 year ago
cake
Cake day: June 6th, 2023

help-circle




  • Fun fact about that: in morse code, SOS is a prosign. This means it gets its own special rules.

    Rather than being three seperate letters (… — …), it’s one letter without any letter spaces (…—…). This is something that applies to all prosigns in morse code, though most of them are just two letters long.

    Also, when sending it on repeat you just continue the pattern without any spaces. Instead of …—… …—… (with a letter space) or …—…/…—… (with a word space), you send …—…—…—…—… and just keep continuing the pattern. iirc SOS is the only prosign where this is a thing.

    Other prosigns are for example HH (…) to indicate a correction to something previously sent, and SK (…-.-) (silent key) to signal that you have finished with the current conversation and the frequency is now clear.





  • If you use btrfs snapshots and systemd-boot instead of grub, then be carefull restoring updates from before a kernel update.

    If I understand it correctly, with systemd-boot the kernel lives in the EFI partition, while the kernel modules live in the main (btrfs) partition. If you restore a snapshot with a different kernel version, it doesn’t restore the kernel itself, but the kernel modules have different filenames, which stops the system from being able to boot.

    At least that is my understanding of the problem, from having to debug it twice (just start a live-boot system and use Timeshift to restore the system to after the update again). The next time I install Linux, I think I’ll go with grub instead of systemd-boot.

    That being said, I really like btrfs snapshots as a sort of “almost backup” (still do regular backups on an external drive). They are quick and easy, and most packet managers can be setup to automatically make a snapshot before installing/updating stuff.



  • Can I take one end of a cable with me?

    What’s the max power I can get from the sockets?

    Where does the eject button dump people and can it be set to dump things other than people as well?

    Does time continue inside the pocket dimension if no one is inside?

    What’s the internal temperature/humidity? Is it regulated?

    Can I choose what I take with me, or is it just everything im wearing/carrying?


    Questions aside, I would fill it with all sorts of stuff that I might need at some point, but leave enough space for a bed and a desk.






  • Nope, at least afaik. Prototyping and building cars by hand (without a whole factory set up to build it) is hard. Not to mention extremely expensive. And you have to build multiple (identical) copies of the prototype to get it street legal, because of crash testing. And you have to be able to guarantee that what people build with your kit remains identical to your prototype. Or everyone assembling such a kit would have to build multiple copies of the car and go through the certification process individually.

    And of course there are very few people that would want to assemble their own car, so you wouldn’t be able to make a business out of it.




  • While, as you said, both wires will conduct electricity just fine, they will have different AC impedance.

    I would guess this wouldn’t make much of a difference if you go Audio->Ethernet->Audio, since sound is at fairly low frequencies. But Ethernet->Audio->Ethernet might have problems with really high data rates, like GiB/s.