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Time Station Emulator

70 points

by FriedPickles

3 hours ago

| past

| 8 comments

| github.com

| HN

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mikestew

2 hours ago

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“One of the higher-frequency harmonics inevitably created by any real-world DAC during playback will then be the original fundamental, which should leak to the environment as a short-range radio transmission via the ad-hoc antenna formed by the physical wires and circuit traces in the audio output path.”

Sometimes I think I’m a smart guy…and then I read of people doing shit like this.

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anfractuosity

37 minutes ago

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You can apparently lock shopping trolleys using the same kind of principle - https://www.tmplab.org/2008/06/18/consumer-b-gone/

And https://www.youtube.com/watch?v=LmSyb0kBvGE

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cvoss

2 hours ago

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I once programmed my TI-84 calculator to do exactly this! The only missing thing was a circuit to convert the audio jack output voltage into the needed form for an antenna. I had the CS know-how but no EE know-how, so I never got it to work. It was fun to dream about confusing my high school's clocks though. (Sadly, the other obstacle was that the clocks only listened for the signal overnight, which improved their chances of detecting the weak broadcast out of far-away Colorado.)

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direwolf20

1 hour ago

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> audio jack

That's a serial port, except when you're playing Bad Apple

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Chaosvex

1 hour ago

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Shame there's no video demonstrating it working. It's a fun idea but without a demo, I'm left wondering about the efficacy.

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daniel_j

16 minutes ago

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I wasn't able to get this to work on a Pixel 8 in Chrome/Firefox on a JP region clock

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McGlockenshire

1 hour ago

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This is pretty darn cool, but I have to say I was somewhat let down by the WWVB signal. I was expecting the entire audible range instead of simply the extracted data. That being said, that's also really darn cool.

I find the WWV/WWVB droning soothing somehow.

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labcomputer

32 minutes ago

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Err… WWVB has no audio range. The carrier frequency is only 60 kHz. It’s effectively a CW signal since the amplitude is only modulated once per second.

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drmpeg

25 minutes ago

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Here's an emulation of WWV I did with a transmit capable SDR.

https://www.youtube.com/watch?v=9LsJn0CyyZI

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wrs

2 hours ago

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And the 2024 lateral thinking award goes to...

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geerlingguy

2 hours ago

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Ha, there's one radio clock in my house that I still keep going for sentimental reasons... it's had a rough time setting itself for a few years, likely due to its placement in the house.

I'll have to test this out sometime, what a fun idea!

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cantalopes

1 hour ago

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What? Wow

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brilliang

22 minutes ago

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Whenever I see things like this, my first thought is that somebody is going to write something to mess up nearby atomic clocks, just because they can, then I think- why, why did you do this?

Then someone will respond: you’re just catatrophising- anyone could’ve done this years before now, and I’ll say no, because it wasn’t up on frontpage HN there with code so that anyone would think of it. Then they’ll say, well why did you tell everyone that idea then! It’s your fault! Then I’ll say that someone would’ve done it if it weren’t me. Then I’ll go have a beer.