tech99's latest activity
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tech99 replied to the thread Weird near-field phenomenon I get in my EM simulation.In the Hertz experiment, he did not rely on the waves impinging on the wire. He arranged for an antenna to sample both the wave on the... -
tech99 replied to the thread Weird near-field phenomenon I get in my EM simulation.Hertz carried out what was, in effect, a race between a wave on a wire and a wave in free space *. If I am reading his paper correctly...
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tech99 replied to the thread When 50,000 volts go through a wire at 5,000,000 FPS - The Slow Mo Guy.The propagation along a wire will depend on the shape into which it is bent and the proximity to other parts of the wire and other...
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tech99 replied to the thread When 50,000 volts go through a wire at 5,000,000 FPS - The Slow Mo Guy.2. I do not agree with this statement . The wave follows the wire, as a waveguide, so that if the wire is in a tortuous path, say a...
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tech99 replied to the thread When 50,000 volts go through a wire at 5,000,000 FPS - The Slow Mo Guy.One of these terminals has an excess of electrons on it, waiting to "go". That is the initiation of the wavefront. We require electrons...
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tech99 replied to the thread Converting PSD into equivalent sound pressure for an underwater hydrophone.If you are actually measuring a noise-like signal, then the electronics must respond to the full sound spectrum and you need to know...
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tech99 replied to the thread Converting PSD into equivalent sound pressure for an underwater hydrophone.The measurement is of a single frequency, so that Power Spectral Density is not the appropriate measurement. All you need to measure is...
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tech99 replied to the thread When 50,000 volts go through a wire at 5,000,000 FPS - The Slow Mo Guy.Where does the initial wavefront come from?
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tech99 replied to the thread When 50,000 volts go through a wire at 5,000,000 FPS - The Slow Mo Guy.5 M frames per sec is not fast enough to capture the wave that travels down the wire starting from the switch, which takes just about a...
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tech99 replied to the thread Multiple signals controlling relay.As I mentioned, I am not too sure of the logic required for the MC ON setting and the manual ON setting, but can al;ster this as required.
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tech99 replied to the thread Multiple signals controlling relay.I am not quite sure of the logic for the case "When this button is pressed / switched to ON, the relay should turn ON if the last signal...
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tech99 replied to the thread Tuning anapole resonator question.I was wondering if you could briefly describe for us the operation of the device. Thank you.
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tech99 replied to the thread I Lightning rods -- how confusing can they be?.The text of the IEC Standard for the protection of buildings against lightning is reproduced here:-...
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tech99 replied to the thread I Energy of Electromagnetic Waves in Destructive Interference.It is interesting that where we have an interference pattern, such as from a knife edge or large aperture, individual bright zones can...
