Chris
posted this
23 January 2018

- Last edited 23 January 2018
Hi, Chris! I think you wish to make us think about using Electromagnetic Induction as a mirror, to reflect a wave such that it adds with the wave that produced it.

However, I don't quite understand how to practically apply the relationship between the length of the wire, wavelength, frequency and DTC. I'll keep thinking and reading.

There is a big question in my head: why Akula used 0.025% DTC with frequency 256 Hz for the length of the wire he is using. How did he come to these numbers?

Hey CD - Coils, Currents, Magnetic Fields and Time are all related - This is Electromagnetic Induction.

One Quarter Wavelength, λ * 0.25, or 25% Duty Cycle of the Current Wave Form is Peak Magnetic Field.

Three Quarter's of the Wavelength is also Peak Magnetic Field, but this is irrelevant, its not used.

In a DC Circuit, the Current in a Coil takes time to reach its maximum, this is normally 5 Time Constants, at this point the Magnetic Field is also at Maximum for the Voltage applied.

Keeping the Voltage applied any longer than this is not bennificial if one is only requiring the Magnetic Field.

The wave length and length of the wire have a relationship, now I am still learning so I encourage you to cross reference and check what I say, but, Energy, if impeded by a Miss-Matched wavelength, will reflect and as a result less power will be available on the output:

The above videos are meant to tie in with the Picture I posted:

I know your calculations resulted with a figure of: 0.025, there may be a harmonic used at this frequency, but the concepts apply. Remember, Akula was a Radio Electronics man, I think something like 9 years in the Radio Electronics arena. So he knew all about this stuff.

Others, Floyd Sweet and Don Smith, no doubt more, knew about this also.

Chris