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Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Find Boards > Today's Finds >

First time out with the DBP2010

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xavier Topic starter

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	First time out with the DBP2010 « on: September 07, 2010, 03:49:31 am »

Well went down to the beach this morning to try out the DBP2010 that I completed a few day's ago but could not do any testing on it due to bad weather. The test did not go too badly as I did find a few sinkers but there are some improvements to be made. I have been getting some false signals so will have to look into it. I did however find that it works better in the water than out. Coil?

Regards Xavier

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	Re: First time out with the DBP2010 « Reply #1 on: September 07, 2010, 11:16:36 am »

Hey, Xavier, knowing you, you will have that dyi machine humming along before too long.

BA

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	Re: First time out with the DBP2010 « Reply #2 on: September 07, 2010, 04:31:05 pm »

Hello Xavier . It sounds like the coil needs a little tweaking , but it is cool you are now posting some field tests !! Great Work you are doing here on our Forum .

HH...........Eugene

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xavier Topic starter

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	Re: First time out with the DBP2010 « Reply #3 on: September 07, 2010, 04:51:12 pm »

Thanks Guys I have made a new coil 3.5 Ohms 435uH did some air testing with it and there is an improvement but I'm still not happy with it so now I will make a 1m x 1m coil measure the resistance and inductance then make a coil of 230mm with the same characteristics that should do it. Here is a pic of my new version.

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	Re: First time out with the DBP2010 « Reply #4 on: September 07, 2010, 05:02:49 pm »

Did you "pot" the coil? That means sealing it in epoxy. When you do that, the coil is held firmly in place by the epoxy. If you don't do that, the coil wires themselves can move fractions of an inch inside of the housing and cause false signals. As the signal to the coil is applied, the coil heats up a few hundredths of a degree causing the wire to expand. It's a common omission by first time builders. If you don't want to fix it with epoxy for some reason, heavy axle grease will work almost as good but the epoxy has the advantage of negative buoyancy in water while grease is positive.

A PI machine should not give false signals otherwise. Eugene is right to suspect the coil.

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	Re: First time out with the DBP2010 « Reply #5 on: September 07, 2010, 05:30:06 pm »

Hi GD

Yes coil is in Epoxy very expensive stuff over here so I just covered the coil with it (no excesses) works well under water better than on land the problem as far as I can see is that the coil is normally 1m x 1m and a resistance of +- 5m Ohms (I will check that) inductance unknown but if I take the same length of wire 32m I end up with 2mH inductance with an 0.5mm gauge wire so I reduced the wire gauge and now have 3.5 Ohms and 435uH did not epoxy it but I did tie it with dental floss every 10mm. Tedious job that is

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	Re: First time out with the DBP2010 « Reply #6 on: September 07, 2010, 10:12:02 pm »

Yep, there's nothing but tedium when you wind coils.

The inductance is a huge factor in the tuning, as you know. The resistance is what consumes the power and is a factor of the wire length and diameter. The capacitance is the reactive component of each wire to adjacent wires. The total circuit LC&R (inductance, capacitance and resistance) is known as reactance which is the inverse of the circuit's overall impedance. You're in to some heavy duty theory if you go beyond the recommended coil from the original design.

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	Re: First time out with the DBP2010 « Reply #7 on: September 08, 2010, 05:18:43 am »

I'm 100% with you there GD that's why I thought of making the 1 x 1m coil to see what the resistance and inductance would be but then I also see that on other designs that the inductance is not the same for different size coils (dam)

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	Re: First time out with the DBP2010 « Reply #8 on: September 08, 2010, 05:39:18 pm »

not

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	Re: First time out with the DBP2010 « Reply #9 on: September 09, 2010, 04:07:47 pm »

	Quote:	Posted by xavier
I'm 100% with you there GD that's why I thought of making the 1 x 1m coil to see what the resistance and inductance would be but then I also see that on other designs that the inductance is not the same for different size coils (dam) Regards Xavier

If you can, make it round rather than the square coil that some people try to make. The round coil has a consistent field strength and makes pinpointing (if you can call it that on a coil that size) a bit more accurate.

Have you ever played around with a Smith Chart to see what happens to your coil under various conditions? Some conditions to consider are two targets close together, two far apart, a target off to the edge, a target upright and so forth. Developing a Smith Chart for response can be a real eye opener and change the way you hunt. For the better.

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