Power vs detection depth

[green]

Hi Green
I will give that some more thought. If the x64 does apply beyond the diameter limit of the coil your tests are still valuable from the point that smaller targets can be detected by a x10 power increase within the diameter range of the coil. Your three coils used in the test; where they the same coil reshaped into the different dimensions?

They were the same coil reshaped. The rectangle shape with round ends weren't much different than the round. I reshaped into a rectangle with square ends and it had a steeper slope giving less signal at longer distances than the round. I've been looking at the tests I've run and for a ball park number the the signal strength drops 63 percent for every .187 x coil diameter increase in target distance for distances less than coil diameter. A 10 inch coil looses 63 percent of signal for every 1.87 inch increase in target distance out to 10 inches.

[Chet]

That is interesting and good information, I plan to build a rectangular coil it will definitely have round ends per your findings.

[green]

That is interesting and good information, I plan to build a rectangular coil it will definitely have round ends per your findings.

I didn't plot signal strength from center to end for the round and square end rectangle end coils. That or how they act on the ground might have an effect on which way is better. From what I know I'm going with the round end too. I plan on doing more testing sometime in the future.