11–20 of 110 posts
We're bathed in EMF. It's what light is, but aside from that we use electricity so much now, we're in a sea of radiation in other frequencies too.
FANTASTIC!! I was just thinking about this the other day, and wondering about directionality... For example, if you had a camera facing a space, and the receiving antenna was within that space... and you were able to (somehow?) from the antennas perspective, see the "direction" the frequency was coming from.. And then map the different specific frequencies within the desired bandwidth to colors... and of course inten…
FANTASTIC!! I was just thinking about this the other day, and wondering about directionality... For example, if you had a camera facing a space, and the receiving antenna was within that space... and you were able to (somehow?) from the antennas perspective, see the "direction" the frequency was coming from.. And then map the different specific frequencies within the desired bandwidth to colors... and of course inten…
FANTASTIC!! I was just thinking about this the other day, and wondering about directionality... For example, if you had a camera facing a space, and the receiving antenna was within that space... and you were able to (somehow?) from the antennas perspective, see the "direction" the frequency was coming from.. And then map the different specific frequencies within the desired bandwidth to colors... and of course inten…
You can kind of do that quite easily at low frequencies, by measuring the phase of signals coming in from a pair of aerials. If you put two aerials a quarter of a wavelength apart and switch between them very quickly at audio rate, then you'll get a tone when there's a difference in phase. If there's no tone the two signals are exactly in phase - the two aerials are exactly the same distance from the transmitter.
If you look on some police cars you'll see a group of four aerials about 15cm apart stuck to the roof which used to be used for "Lojack" style trackers.
There are a whole bunch of circuit diagrams floating around for doing this kind of thing, with the simplest being Ye Olde 555 timer and a couple of PIN diodes!
FANTASTIC!! I was just thinking about this the other day, and wondering about directionality... For example, if you had a camera facing a space, and the receiving antenna was within that space... and you were able to (somehow?) from the antennas perspective, see the "direction" the frequency was coming from.. And then map the different specific frequencies within the desired bandwidth to colors... and of course inten…
Yes it has been done: https://youtu.be/sXwDrcd1t-E?si=V75bEPMT8qGbo1wG
His other projects are so interesting. I love this one https://rootkid.me/works/exhibit-a
What would really finish it for me, though, is if, when the button is released, the device shows a website, with URL visible, with a photo of the criminal, with added facial recognition and lookup of social media to find their identity.
What fun!