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Time Machines & Experiments
Delta T, Helmholtz Variation
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<blockquote data-quote="Sonix" data-source="post: 186065" data-attributes="member: 10954"><p>Per Helmholtz, two twin coils placed parallel to each other at a distance apart that is equal to the radius of the coils creates a region of uniform magnetic field between them.</p><p></p><p>[ATTACH=full]8369[/ATTACH]</p><p></p><p>This inspired me to consider a Helmholtz variation of the Delta T antenna. Each of the 3 square coils of the Delta T would be replaced by 2 parallel coils, making 6 square coils in all. There is a decision to be made re distance apart of the coils with square coils that does not need to be made with circular coils as the diameter of a circular coil is the same in all directions whereas with a square coil the diameter ranges from the length of a side to the length of the diagonal. For experimental purpose I settled on placing the square coils apart by a distance of 1/2 the length of a side.</p><p></p><p>Here is my first attempt. 32AWG magnet wire, 100 wraps per coil. Coils are 10cm x 10cm. Resistance each coil is 22.7ohms +-0.2.</p><p>These specs are most probably not ideal and may in fact be counter-effective - I worked with the wire I had on hand using a form that was handy and chose 100 wraps arbitrarily. Perhaps someone with more experience in coils can advise on more effective variations.</p><p>I recognize as well that this is pretty wonky...</p><p></p><p>[ATTACH=full]8370[/ATTACH]</p><p></p><p>Now I just need to hook up the wires and work on a source for sine, phase invert sine, and white noise to power it.</p><p></p><p>Any reasoned input would be greatly appreciated.</p></blockquote><p></p>
[QUOTE="Sonix, post: 186065, member: 10954"] Per Helmholtz, two twin coils placed parallel to each other at a distance apart that is equal to the radius of the coils creates a region of uniform magnetic field between them. [ATTACH type="full" alt="8369"]8369[/ATTACH] This inspired me to consider a Helmholtz variation of the Delta T antenna. Each of the 3 square coils of the Delta T would be replaced by 2 parallel coils, making 6 square coils in all. There is a decision to be made re distance apart of the coils with square coils that does not need to be made with circular coils as the diameter of a circular coil is the same in all directions whereas with a square coil the diameter ranges from the length of a side to the length of the diagonal. For experimental purpose I settled on placing the square coils apart by a distance of 1/2 the length of a side. Here is my first attempt. 32AWG magnet wire, 100 wraps per coil. Coils are 10cm x 10cm. Resistance each coil is 22.7ohms +-0.2. These specs are most probably not ideal and may in fact be counter-effective - I worked with the wire I had on hand using a form that was handy and chose 100 wraps arbitrarily. Perhaps someone with more experience in coils can advise on more effective variations. I recognize as well that this is pretty wonky... [ATTACH type="full" alt="8370"]8370[/ATTACH] Now I just need to hook up the wires and work on a source for sine, phase invert sine, and white noise to power it. Any reasoned input would be greatly appreciated. [/QUOTE]
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