Building a coil for an existing unit?

[SwampHunter]

I would like to build a coil that is 2 to 3 foot wide for pulling in the field, but would like to be able to use it with one of my existing machines.
Has anyone ever built such an item?
Basically I just want to be able to cover alot of ground in some of our less trashy areas and also be able to locate old house places quicker.

 

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[russau]

the trouble with a large diameter coil is that you cant get it around a lot of spaces. to restricktive! but id also like the info for makeing my own coil of maybe 18 inchs. like what would the wire size be(awg) might be? how many turns? maybe the easiest /best way would be to just to buy one.

 

[littleneckhalfshell]

Me too, me too....

The idea of a LARGE coil, to pull behind an ATV, or push on plastic wheels, to cover large area to discover even trash concentrations, that could then be marked for examination with the smaller coil for the same machine is attractive. But I have no idea on how to do it. I am sure there are more considerations than just winding some wire around a pvc frame. Would more power be needed for the large coil? Can a Garrett masterhunter move a big coil electronically? All good questions, but does anyone have an answer, that does not involve large amounts of money being spent

 

[boogeyman]

Excellent questions! I've asked some people I know that are more versed in electronics than I. Best answer I can get is a head scratch & shoulder shrug. I sent an Email to a company to inquire if they could build a custom coil & price etc. still waiting for a reply.

Years ago, I had the bright idea of building a large coil for a RatShack detector. My waterproofing compound from work worked to perfection but the rest was a disaster!!!!!! Took the stock coil apart and counted the winds + wire gauge, wasn't thinking about impedance & all that good stuff. Was hoping to be able to suspend it from a Boston Whaler, and use a set of grapnels to recover. We were doing OK without a detector, and figured with a detector our results would improve immensly.

 

[russau]

im under the impression that a coil will be more senetive if you have a larger dia. loop and real fine dia. of wire with a lot of turns. these turns of wire need to be mounted firmly and not able to move or youll get a false signal. thats all i can muster up so far on coils.

 

[GOLDCATCHER]

If your going to build a coil the main thing you need is Faraday's law.

 

[EE THr]

Here is a detector technical forum. This is a link to the coil section.

http://www.thunting.com/geotech/forums/forumdisplay.php?f=6

 

[pegleglooker]

check the California board and look for oldcal... in some of his posts he talked about how he built his own coil

PLL

 

[theGOLD]

JW fisher makes a 48 inch draggable coil. It hooks up to the 8x housing...

 

[willie d]

Here ya go.Rob in KS built one. http://forum.treasurenet.com/index.php/topic,87725.0.html

 

[cosmic]

I guess no one wants to show how to build one.. Lots of talking, yet no step by step...

 

[rmptr]

I've looked through the info, here and there.

I have some ham radio experience, built a flock of antennas, and savvy the tools needed.

It's difficult.

PI is probably the best shot.

And, the most creative information seems to come out of eastern europe.
They reverse engineer a lot of stuff there, are very bright, and are not afraid to think out of the box.

Frequently, they HAVE no box.
(Compared to the access to awesome technology we have here in estados unidos.)

Basically, if you desire something different, or unusual, you're going to need to take a walk on the wild side,
out there with the fringe element. It's always fun, so keep that in mind and you'll do fine.

Hope you succeed in your search for applicable and practical info.
rmptr