Coil Design

[Anonymous]

Here is a great post by George Payne and as many of you know invented the VLF detector.
http://www.jb-ms.com/Baron/gb.htm
There is some good information for coil design in his post. I will post some about the design of the Explorer coil and how they are wound later today or this week.
HH, Cody

 

[Anonymous]

Surely George Payne is responsible for many superior aspects of VLF detectors. I really feel all DD cols are not equal and looking forward to your feelings on the design of the Explorer coil..

 

[Anonymous]

Dan, I am reading the patents now and looking at other designs of the DD coils. I am so pleased with the stock coil and the small one that I have paid very little attention to this area. It does look like there are some very good ones out there. I will post what I find out but it will be up to the folks that have used them to tell us how they work. I am very interested in the work Glenn is doing. I cannot bring myself to start another project such as coil design so will leave that up to others.
HH, Cody

 

[Anonymous]

Cody,
I have not designed any detectors/coils since the early '70s because I would rather hunt than design my own detectors/coils. Plus the designs started becoming much more sophisticated after the early 70s. I found that I got all the opportunities to do design work as a profession and did not need the hobby design activity.
The last detector I designed used a coil design with about a 12" circular transmitter coil. The receive coil was wound in a figure 8 configuration which fit inside the diameter of the transmit coil in a co-planar configuration.
The transmitted magnetic field coupled into the figure 8 receive coil in such a manner that the flux coupled into the receive coil would have a net zero flux (the flux coupled into one half of the figure 8 recieve coil was positive while the other half was negative) if the target matrix under the coils was homogeneous. It did not make any difference what the ground mineralization was, the net flux would always be zero if the the target matrix was homogeneous.
Anything that disturbed the homogeneous nature of the target matrix would produce an imbalance of the coupling into the receive coil.
The advantage of this design was that:
* It had automatic ground balancing.
* It was a non-motion machine.
* It had quite good depth.
The disadvantage of this deign was that:
* It had no discrimination capabilities.
I built two of these, one for myself and one for my father-in-law. We found a lot of stuff because back then there were lots of good targets and not too much trash.
HH,
Glenn