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Offline electech2uTopic starter
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« on: March 01, 2009, 03:22:58 pm »
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Hi, this is just my second post, i just found your site, and i like it already. I was looking for a place to learn the circuitry of metal locators, thinking of building one, and it seems ive struck gold here Smiley  I also have scopes, generators, and all the usual test equipment so i can do a little experimentation on circuits i build or troubleshoot.I look forward to reading the post of all the members and learning as much as possible before i build my first project.Any good books available on the circuitry or theory of operations of the different types?


                                                                    thanks
                                                                    randy

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Offline Eugene52
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« Reply #1 on: March 01, 2009, 03:42:47 pm »
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Hello electech2u and  Welcome to this Great Thunting.com forum !! This web-site is growing like crazy and our "Tech Talk" Schematic Library should have something for you to Build !! There are some Good VLF [very low frequency] Metal Detector circuits . And several Great P.I. [pulse induction]  circuits for Deeper Detecting !!!
Search the Forum for a few hours , If you have any questions let us know. It sound like you already have a good R.F. Background , so you will not have a problem building a Project from Thunting.com........Best Regards.........Eugene52

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« Reply #2 on: March 01, 2009, 03:45:11 pm »
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 Welcome Aboard Randy you have struck gold here with your intrests

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Offline vector180
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« Reply #3 on: March 01, 2009, 04:32:12 pm »
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HI Randy, I know your new at this but with your RF background you may have some insight on one of my problems.

Im trying to detect arrows, within say 5m radius of my position. An arrow head is a fair lump of metal (125grains) in fact. In the (fired into bush) scenario, its not buried just simply camouflaged by twigs n such. Should not have the attenuation issues of earth.

I wonder if a transmit/ reflect echo type rf device would pick up the head and give a direction. Often its all one needs.

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Offline electech2uTopic starter
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« Reply #4 on: March 01, 2009, 05:26:44 pm »
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well i dont know if i would be the one to help you yet, although i know a little about electronics i have alot to learn about metal detectors.I am not sure what the range of the different types are, or even the differences in performance from one type to the next.What i do know is how the circuit components work, and how to trace the signals through them and find faults,that is from working on tvs,stereos,guitar amps,radios, stuff like that.I am curious to find out what frequencies the vlf types work with, i have some experience with vlf and also with pulse circuits(digital).Maybe as my understanding deepens on the subject i will be able to help.

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Offline Eugene52
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« Reply #5 on: March 01, 2009, 06:34:03 pm »
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Quote:Posted by vector180
HI Randy, I know your new at this but with your RF background you may have some insight on one of my problems.

Im trying to detect arrows, within say 5m radius of my position. An arrow head is a fair lump of metal (125grains) in fact. In the (fired into bush) scenario, its not buried just simply camouflaged by twigs n such. Should not have the attenuation issues of earth.

I wonder if a transmit/ reflect echo type rf device would pick up the head and give a direction. Often its all one needs.




Hello vector180,electech2u and Everyone . Copper or bronze Arrowheads are becoming very valuable . You can use a VLF type machine but must be carefull with your discrimination settings so you do not miss a target or just simply use the All matal mode setting !!Also ,  a pulse induction Machine with a small diameter search coil would be perfect for small arrowheads !! Here are a few good links to check out . Both of you will be Great new contributors here on this forum because of your Interests and Backgrounds . So Keep coming back , Thunting.com is a Cool Place !!
 :Smiley..............Eugene52

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http://query.nytimes.com/gst/fullpage.html?res=9900E2D61639F936A2575BC0A96F958260


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http://metaldetectingworld.com/06_finds_scythian_arrowhead.shtml


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http://www.spiegel.de/international/germany/0,1518,596720,00.html




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Offline vector180
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« Reply #6 on: March 01, 2009, 06:45:43 pm »
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Quote:Posted by electech2u
well i dont know if i would be the one to help you yet,


yep just curios Wink I also do a fair amount of microprocessor work (PIC's) and was looking to see if that would simplify the typical analogue circuitry found here. IF, and Im too new at it all to confirm this yet, its all about timing, switching and monitoring delays a micro design might just be what we are after. Once the RF trx and amplifier are made that is Wink

Just about need a detector to find my way around this forum Smiley Its making headway a little slow on the old learning curve.

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Offline electech2uTopic starter
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« Reply #7 on: March 01, 2009, 07:10:38 pm »
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i was just thinking about the use of a microprocessor design a couple moments ago myself.I found a tutorial on the PI type metal locators and now i have a clearer picture in my mind of what it is, and i was wondering if only coils are used to transmit and receive the pulse or if maybe a circular polarized dipole array would work? or a reflective element added over the coils to focus the signal deeper or widen its propagation? just thoughts, i still have alot to learn here.

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Offline electech2uTopic starter
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« Reply #8 on: March 01, 2009, 07:19:11 pm »
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when a loop antenna is shorter than 1/10 wavelength it responds to the magnetic component of the wave, if it is over 10th wavelength it will respond to the electric portion (at radio frequencies). now i am wondering what is the upper frequency limit used for the vlf type metal locators? i see where one was build just below the am broadcast band.could they work all the way up through the radio spectrum into the microwave regions like radar? it seems to be the same principal, i have so much much to learn here it has my mind reeling   lol

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« Reply #9 on: March 01, 2009, 07:22:49 pm »
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what frequencies do ground penetrating radar use?

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