1. 40
  1. 8

    This was fantastic. I loved every part of this video and I feel like I finally really understand what amplitude modulation and demodulation is. So that’s what a modem does!

    And wireless Mario!

    How interesting.

    1. 7

      That “how does AM work” graphic was much better than anything I saw studying for amateur radio exams.

      1. 1

        Seriously the graphics were top notch. I’m extremely impressed and I’m now watching all this dude’s videos.

        1. 2

          There’s another four or five videos at least on this person’s channel that would make perfectly good lobsters submissions in their own right - I just watched https://www.youtube.com/watch?v=rn1-HIVeKbQ wherein he experiments on a hard drive while it is running and copying a file.

          1. 1

            The only problem I had with that video is that SMART is rather useless for figuring out whether data has been silently corrupted. Hence the silent. I’d have really enjoyed a run of that video with ZFS while scrubbing…

            Anyway, I’m sure he’d want to do a repeat. For science.

      2. 3

        Yeah - I’ve seen radio signals described in terms of carrier and modulation many times, but that metaphor of “squinting at” the incoming signal to the receiver to recover the original base video signal made something click in my head.

      3. 3

        Pretty good video.

        The one thing that confused me was when he opened up the NES and showed the metal box at the back and said that was the RF adapter. I always thought the little grey box that plus into the NES (https://knowyourmeme.com/photos/1184070-nintendo-switch) was the “RF adapter”, but apparently that was the “RF switch”. But the “switch” between channels 3 and 4 was on the back of the NES-001, so why was the little box called a “switch”? What was the little box for, just to give you a place to plug in your TV antenna?

        1. 4

          It allows you to keep your NES plugged in all the the time without interrupting your viewing of analog TV or cable. It accomplished this by switching between the two inputs. The NES (or “control deck”) input is used if RF signal there is detected, otherwise it passes through the input from the ANT connector.

          Nintendo documents the expected hookup. If you’re not interested in viewing analog TV (I don’t blame you in 2020) you can also directly connect the NES to the TV, as shown in the video, without the RF Switch.

          1. 5

            To add on to that, in the days of the ColecoVision and the Atari VCS, the RF Switch was actually a physical switch that the player had to flip from “antenna” to “game” when they wanted to play.

            This is what those switches looked like before the automatic NES RF switch was introduced: https://www.reddit.com/r/nostalgia/comments/b995ww/rf_switch_box_adapter_atari_intellivision/

            I once re-wired a Coleco Telstar pong clone from 1977 to use an NES RF switch, but it didn’t really work well. The game image did partially come through, but it was very noisy - almost as though the TV was getting signal from both the antenna and the game at the same time. I never investigated the cause, but it seems as though there is something important in the RF output from the NES that makes the automatic switch work.

        2. 2

          During High School the NES is what got me hooked on diving into the topic of RF. I was about to move a TV, unplugged everything, except the NES Antenna box. Turned on the TV and to my surprise, was receiving DVB-T HD Channels of the local stations. How on earth could this work? That was my introduction to the field. And now the NES get’s to teach me some more RF stuff :D

          1. 2

            Supremely interesting, and a great presentation of the subject at hand. He was able to break down complex ideas into bite size that I could understand.