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Offline hargrovebrianTopic starter
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« on: December 26, 2009, 12:30:10 pm »
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 Hello

     How can i make a large coil and how large can it be?  I am new to this and have a few metal detectors can i use this coil with any detector? Is thier a place to purchase the materal? and were would i find a scematic?

P.S. something my brother and i could carry or drag thru the fields.

          Thank You brian

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Offline GoldDigger1950
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« Reply #1 on: December 26, 2009, 12:35:48 pm »
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Welcome aboard, Brian!

Basically a coil can be as large as you can carry but must have an impedance match to your machine. That's not optional. Your coil is an integral part of your detector's internal oscillator. Even the smallest mismatch can cause your machine to not function.

Perhaps, if you gave us some idea what you have in mind, a solution to your query could be better provided. How deep do you expect your targets to be? How much mass do you estimate they will they have and what are they made of? Will there be many of them in a bunch or will they be single targets? There may be better solutions to what you wish to do besides making a larger coil. We have a considerable knowledge bank here of individuals who can give advice.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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Offline hargrovebrianTopic starter
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« Reply #2 on: December 26, 2009, 05:57:59 pm »
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Hello

 Thank You i will try to learn more about matching coils to circutry and mabe some spelling to. i kind of jumped the gun. My brother is the one who owns the metal detectors, He wants to search for metorites in upstate New York. My plan was to suprize him in may with a coil we could both carry in order to spend some quality time. but i will call him and find out what kind detectors he has. we are not young anymore maby one that is drawn behind a quad or  an old army jeep.
 
                                Thank You brian

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Offline GoldDigger1950
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« Reply #3 on: December 26, 2009, 08:29:38 pm »
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When you draw a coil behind a vehicle, it needs to be one that has Faraday shielding. This isn't something you can normally build in your garage. Scale it down a bit. Meteorites are not usually very deep. Don't let your imagination run away here. They might be laying on the surface or they may be 18" or so. They get slowed down in the atmosphere and hardly ever come straight down. They most often come in on a glancing trajectory.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!
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« Reply #4 on: December 27, 2009, 08:35:45 am »
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Hello
  Thanks i know that right now my excitement is high and i do not wish to get bogged down with electical complacations
iam still confused with coil and detector matching. I do wish to cover large areas in upstate new york the farms are big and my brother seems to know everyone and when he goes to do something he always goes all out. i plan on loosing a lot of weight when i go to visit from washington state in may. hopfully by then i willbe calm and collected.
Thank You brian




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« Reply #5 on: December 27, 2009, 09:44:46 am »
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Hi Brian and welcome to the forum,

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http://thunting.com/smf/fossils_meteorites_rocks_gems/prospecting_for_space_rocks-t1694.0.html;msg14551


I put a link on thunting several years ago that might be of interest to you. A forum member, in a thread, mentions what detector, with a custom coil, the meteorite hunter pulls behind his vehicle.

Are you planning to search in an area where meteorites have been found in the past? Sue




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Offline hargrovebrianTopic starter
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« Reply #6 on: December 29, 2009, 02:41:57 pm »
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Hello
i dont know. he came up with this idea last year. i will ask him if he has done any research. if not i will add this to my growing list of todos. so far it looks like the best idea is to use regular coils and work fast trying not to lose site of your grid. perhaps we could use flags to mark posable finds and then return after a certain length of time to persue farther. this should allow more field time.
Thank You brian
Hi

  I found a patented in 1972 by garrett that uses a coaxial cable. i think i will try to use this for a large towable coil. I see that the larger the cable is the less turns there are.  This unit uses 2 turns but the coil is not that large? Am i dealing with something like a radio transmiter with an (directional) antenna and a receiver andpowered in watts?
Brian

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Offline GoldDigger1950
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« Reply #7 on: December 29, 2009, 05:05:13 pm »
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The Garrett coaxial cable coil used the shield wire, not the center wire. It was designed for detecting objects as large as a vehicle but useless on the smaller targets. I mean useless. It wouldn't even detect the metal wheels that transported it along the ground.

Look, mate, just get a 14 inch coil for your machine for now. Locate your meteorite area and then do a grid around it, like I said earlier, and map the ejecta. You'll find more targets that way and also plot the most likely location of the big central mass. No kidding. As I also said, there are formulas out there that can predict all these things from the evidence collected. Draw your map of the crater area, search in a pattern around it, plot each and every find accurately and eventually a pattern will emerge. When it does, you can calculate back to the origin point quite easily and locate the bigger mass.

Go to any astronomy site for the mathematics. Ask about the formula on the astronomy forums. They're as helpful as the treasure hunters here. And you get to expand your knowledge a bit in the process. Who knows? You may become the expert on meteorites here after a while.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!
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« Reply #8 on: December 30, 2009, 08:30:30 am »
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Thank You     Will do.     brian

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« Reply #9 on: December 30, 2009, 03:05:19 pm »
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While I don't hunt for meteorites, I do find the topic interesting.  And reading this thread made me recall a recent-television show aired in the U.S. that followed two blokes on a series of meteorite hunts.  Beyond entertainment, these video and website links might provide you with technical inspiration, and also show you how deep you might have to go to find your target...  Hope you enjoy them!

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Metorite Men on the Discovery Channelhttp://science.discovery.com/videos/meteorite-men/

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Meteorte Men websitehttp://www.meteoritemen.com/

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Mr. Meteorite on YouTubehttp://www.youtube.com/user/mrmeteorite

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Meteorite hunt on Prospecting Channel.comhttp://prospectingchannel.com/Meteorite.html


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