Coil without coil!

[Funfinder]

For handheldable deep-search every coil that is over 50cm/1.5ft diameter starts to get very heavy and "unusable".

And the 2box method also is not the best solution - because one coil should be left and one should be right while walking and not: before-behind.

The pics here:
http://www.pulsediscriminator.net/gallery.html
show a much better and lightweight solution.

Can we use those kind of antennas for depth metal detection?

[simonbaker]

For handheldable deep-search every coil that is over 50cm/1.5ft diameter starts to get very heavy and "unusable".

And the 2box method also is not the best solution - because one coil should be left and one should be right while walking and not: before-behind.

The pics here:
http://www.pulsediscriminator.net/gallery.html
show a much better and lightweight solution.

Can we use those kind of antennas for depth metal detection?

Maybe. But just in case, bring two and a plank so you can have a picnic table.

Sorry...

-SB

[Carl-NC]

And the 2box method also is not the best solution - because one coil should be left and one should be right while walking and not: before-behind.

Why is that?

Can we use those kind of antennas for depth metal detection?

Only if your metal detector is GPR, not induction.

[WM6]

Useful readings:

J. Hettinger, “Aerial Conductor for Wireless Signaling and Other Purposes,” Patent
number 1,309,031, July 8, 1919.

Acoustically Driven Plasma Antenna, Patent number 6,087,992, July 11, 2000, T. R.
Anderson

Plasma Antenna With Electro-optical Modulator, Patent number 6,087,993, July 11,
2000, T. R. Anderson, et al

Horizontal Plasma Antenna Using Plasma Drift Currents, Patent number 6,118,407,
September 12, 2000, T. R. Anderson

Reconfigurable Plasma Antenna, Patent number 6,369,763, April 9, 2002, E. G. Norris, et al

Expandable Antenna, Patent number 6,512,496, January 28, 2003, Igor Alexeff, et al

Establishing Highly Conductive Path in Gas by Thermal Guidance of Discharge, Patent
number 3,775,638, November 27, 1973, D. Tidman

[Aziz]

Hi all,

we are dealing with hundreds of MHz or even GHz.
Penetration depth suffers so much. The skin effect of the ground dominates here.
GPR's have their own legitimacy. But the inductive operating metal detectors get more.
Aziz