TwoBox Locator Startronic

[Hakan]

Hello.
I'm new to this forum. And first of all, let me say that my English is not the best (use the Google translator). I have read a lot on the forum and found that there are a lot of knowledge here. Metal Search is new to me. I have also taken note of the applications and has designed a Two Box Locator, which I have questions about. It seems to work very well. Face to Face has a range of 40 meters at 9 volts and 60 meters at 12 volts operating voltage. 38 cm coils with 154 turns and the frequency is 2385 Hz. The receiver is straight and has no band-pass filter. Careful trimming has been done and the transmitter and receiver have the same resonance frequency. The coils should be made watertight and will scan the bottom of a lake at 12 meters depth, where an airplane has been missing for 70 years. So here's question number one: Does the detector as well in the water in the air? In air, I can indicate a car at 1.5 to 2 meters. It seems too little. Question number 2: Should not it be more then 2 meters? I am also grateful for the comments about my schedule even negative.


BR Hakan

[WM6]

Hello.
I'm new to this forum. And first of all, let me say that my English is not the best (use the Google translator). I have read a lot on the forum and found that there are a lot of knowledge here. Metal Search is new to me. I have also taken note of the applications and has designed a Two Box Locator, which I have questions about. It seems to work very well. Face to Face has a range of 40 meters at 9 volts and 60 meters at 12 volts operating voltage. 38 cm coils with 154 turns and the frequency is 2385 Hz. The receiver is straight and has no band-pass filter. Careful trimming has been done and the transmitter and receiver have the same resonance frequency. The coils should be made watertight and will scan the bottom of a lake at 12 meters depth, where an airplane has been missing for 70 years. So here's question number one: Does the detector as well in the water in the air? In air, I can indicate a car at 1.5 to 2 meters. It seems too little. Question number 2: Should not it be more then 2 meters? I am also grateful for the comments about my schedule even negative.


BR Hakan

Hi Hakan

congratulation on design.

I do not understand this: you say that device has 40m or 60m range, but you cannot detect a car on more than 2m? How do you measure / establish a range of you TR detector?

[Hakan]

Hi WM6
With Coils in paralell (face to face) 60 meters between coils I can detect the signal. In 90 degree as standard Twobox with distans of 90cm between coils I can detect a car for 2 meters. Hope you can understand this.

[poorman]

what about its pcb and coil photo...

[Hakan]

Hi poorman. <br>I have not done any PCB. It is built as a prototype in the air. This&nbsp; building is a one-time thing and I have no plans for PCB today but it will&nbsp; be perhaps later when I received a reply to the small problem I have with it.<br>

[Hakan]

And here a photo.

[detectoman]

may be if you change distance coil to coil can take other armonic, too can try changing distinct frecuences in ne555 oscilator, due when tx and rx is extremely powerfull an near, then are neutralized or lowed the rx 324 ic functions, try whit less power or blind any coil whit aluminum, too can put coils then little, await these help bye

[Geo]

Hi Hakan.
First congratulation for your detector.
To detect more distance you must align the coils better, it is very critical. So the one coil must be fix on the arm and the other coil must have the ability to go up, down, left and right. Also the metalic base in the center of the one coil that you use to adjust it it is not a good solution. Because the object that you are looking for is very big (airplane) you can make more big coils and bigger distance betwen coils. For example you can use two coil with 1m diameter and one arm of 3...4 meters.

Good luck

[Hakan]

Thanks Detectoman.
I will take good care of your info.
Hakan

[Hakan]

Thanks Geo.
I have noticed that the coils are difficult to adjust. I can get a dip in the signal but it still does not work properly, so I'll fix one that is more stable and more adjustable. The aircraft, which is located in the lake we do not know much about. It is likely that there is a German fighter and can be built of fabric weave and wood and have a V8 engine of aluminum. No one knows for sure. I am a bit afraid that the difficulties are great with a Two Box trailing in the water 12 meter down ... it should be of slimline type to meet resistance in the watered while it is great. Do you think I can use a PI which becomes smaller and easier to make waterproof ... but it should register 3-4 meter, you have suggestions for something I'm grateful? I do not want to build an advanced type since only be used once. My thought is that electronics are supplied with into the depths along with the coils and the drive voltage and the speaker should be above the water. Google english.
Hakan

[Geo]

Thanks Geo.
I have noticed that the coils are difficult to adjust. I can get a dip in the signal but it still does not work properly, so I'll fix one that is more stable and more adjustable. The aircraft, which is located in the lake we do not know much about. It is likely that there is a German fighter and can be built of fabric weave and wood and have a V8 engine of aluminum. No one knows for sure. I am a bit afraid that the difficulties are great with a Two Box trailing in the water 12 meter down ... it should be of slimline type to meet resistance in the watered while it is great. Do you think I can use a PI which becomes smaller and easier to make waterproof ... but it should register 3-4 meter, you have suggestions for something I'm grateful? I do not want to build an advanced type since only be used once. My thought is that electronics are supplied with into the depths along with the coils and the drive voltage and the speaker should be above the water. Google english.
Hakan

Who is the depth of the water??

[Hakan]

The lake is 12 meter dept.

[Geo]

Hi Hakan.
12M is big depth
Yes... 2Box is not a good choise.
PI with large coils can detect big objects at depth about 3 times the coil diameter. So a 4x4 or 5x5 square coil would be a good choise, but i don't know what will happened with the water?????
Also you must give a look at magnetometers but i am not sure. They have small dimentions with very good depth

Good luck

[rider]

tried to build a detector underwater. to operate under the water with a coil that pulled a boat in depth 5-10 meters. means the boat will have the control and particulars of the detector ...

[Hakan]

Tack Geo and rider.
It is likely that you misunderstood me or that I expressed myself wrong. I have made watertight coils with size 1.1x0.7 meters. They should be placed 4 meters apart and lowered into the lake. I tested a 15 meter long cables between the electronics and coils and it works fine. Can easily indicate a squaremeter metal of 4 meter in the air. This is good enough for me .... But I have not tested this in the water. When this is finished, I upload a picture of the "monster" on the forum. Will this not work, I consider your proposal with the magnetometer.

Hakan