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.
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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...
Delta T, Helmholtz Variation
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...
Delta T, Helmholtz Variation