looking for home-made G.P.R.

[Valchev]

I have a customer in Ohio that searches for gems with our radar, it is not metal neither, but it is definitely a treasure.

I can for instance show the results of an antenna surveying a lake in Croatia, see the attached picture. This company was searching in a lake for pieces of "black oak" which is much more valuable than many of the "treasures" many people find and it doesn't affect the national cultural heritage. The lake was heavily contaminated with peat coal residues and clay. It doesn't take a geophysicist to understand that a survey here is impossible.

These are quite unusual goal for the GPR. Some time ago I exchange e-mails with men interested in the same type of survey, but I gave no positive answer for these purposes. I guess (though this is a quite unusual targets) they are not the same men, i think it is a coincidence, because:

Another thing, if you notice I have never tried to sell anything here because as I said earlier I visit this forums as a private person and the company I work for doesn't sell equipment in forums or advertise in those neither, no need for that, that simple it is.

Are my assumptions right?





------------------------------------

[Valchev]

Here Valchev you are taking a dangerous road, as before, you don't know me and where I have been or not been to make this kind of statements.

http://www.geotech1.com/forums/showp...&postcount=196

I know you from:

My previous question:

In my place the ground conductivity is 15mS/m , what will be the depth ?

http://www.geotech1.com/forums/showp...&postcount=144

The answer:

15ms/m is still very good and your results should be quite nice.

http://www.geotech1.com/forums/showp...&postcount=145

Thank you very much for so knowledgeable answer, this is highly esteemed advice!

A some time ago i sent the similar question to some GPR producers , but i received NOT positive answer! I sent this question because a customers was interested to buy a highly qualitative commercial GPR. But the customers desided and bought a expencive commercial GPR. We made many tests in this soil and understand that the producers answer was right, in this soil any GPR can not to penetrate. It is because the penetration depth depend too from clay content and type of clay in soil.
Therefore on my page you can to read:
http://m12.hit.bg/gpr_eng.html
" All GPR are excellent to survey in rocks and sands, good in rather dry soils without clay, and useless in soil with clay and wet soils ."

" In practice it is very difficult or impossible to predict how deep GPR can see in soil because it is depend from soils characteristics. "

But my next question is:
Why Mr Reinaldo Alvarez Cabrera ( http://www.geoscanners.com http://www.geoscanners.se )
gave me so different advice than other GPR producers ?

I guess the next answers:

1 - Mr Reinaldo Alvarez Cabrera have not experience in real conditions!
2 - Mr Reinaldo Alvarez Cabrera mislead !

I suppose 1 and 2 are true.

Be careful when somebody "high knowledgeable" as Mr Reinaldo Alvarez Cabrera give you advice! Because you can to buy very expensive but useless device for your goal!




---------------------------

[gwzd]

Hi Everyone!
Peter Annan uses a very nice radar equation for calculating very accurately the penetration depth. However, for those who cannot handle it, or doesn't count with all the required data he says "a coarse rule of thumb for penetration is:
d = 35/sigma where d is penetration depth in meters and sigma is conductivity of the soil in milliSiemens/meter"
From here we get:
d = 35/15 = 2.33 meters or 7.64 feet, pretty good, Ah?
There are many other factors influencing this figure as said somewhere else, so this might be too short or too large depending on those factors. Many times 2.33 meters is good, sometimes it is not, it all boils down to your particular application.

The correct way to do would be to know all the parameters to be able to provide a correct answer. The target geometry and the materials relative dielectric permittivity contrast will also affect the detection ratio. None the less, the formula give a ball park estimate and the right thing to do would be to "try before you buy". Always ask for a demonstration in your place and a local phone number so you know where to call for help if something goes wrong.

A couple of examples with penetrations in areas with >15mS/m and acceptable for the required targets can be found here:

http://www.stega.it/pub/GPR.pdf
http://tinyurl.com/yfqsysf


Companies in the EU have the obligation to refund the money within 14 days from receiving the equipment back if the customer is not satisfied for any given reason within the established period of time. Statements like "sell and run" are only applicable for private persons with no legal obligations. Think of it like buying stuff in the flea market. If it doesn't work then, Oops! When buying in the EU is a good practice to check with your local tax authorities that the VAT number of the company selling the equipment is a guilty one and it doesn't have any pending litigation. This service usually doesn't cost anything in most countries, but it might not be the case in your particular country, that I don't know.
For purchases outside the EU like China for instance it is required that you present a valid certificate of quality and assurance signed and stamped in the country of origin chamber of commerce.
I hope this is informative and can help you in your next purchase of a GPR system.

Thanks,
Reinaldo Alvarez Cabrera
http://www.geoscanners.com
http://www.geoscanners.se

[olympios]

.............

When and if you want to buy it you'll be given a quotation depending on the country you are from. You may accept it or do as with GSSI, reject it.
That is your prerogative and I believe nobody is going to force you buy, isn't that right?
Regards,
RA

Yes, I'm really interested on buying one but definitely it will not be from you! Judging from the way you treat Valchev, you are not a businessman but rather a con artist. Valchev had the decency to agree that his english need improvement, but with you your attitude needs lots of improvement!
I would 've bought his GPR but I need something that can be used in road construction rather than treasure hunting.

[Valchev]

home-made GPR

New 400MHz shielded GPR antenna - home-made:

https://sites.google.com/site/vgeora...ielded-antenna






.

[ishtar hunter]

Here are picture from home-build GPR

Hi
I have a question for you
What's your software name for your made gpr?

[ishtar hunter]

Petar Valchev
[email protected]

Bulgaria

Home-build GROUND PENETRATING RADAR

This ground penetrating radar (GPR) has been designed specially for treasure hunting. GPR can find subsurface heterogeneities, as a cavities, tunnels and other objects. The obtained information immediately appears on the laptop display. GPR can find good, subsurface cavities large than 1metre x 1m x 1m, with so-so flat ceiling. Less objects will be find with difficulty and not so deeply. Laptop can be any pentium or even though old 486 with DOS, and COM port ( RS232 ). Manufacturers advertise for similar antennas 150Mhz depth from 7m to 10m, but with a small letters write 'Depth of investigation is understood to be detection depth of a flat boundary with reflectance equal to 1'. But reflectance equal to 1, have only metal flatness 4m X 4m, or a lake bottom. A cave in limestone or dry Soil, have reflectance equal to 0.5 and then 10m x 0.5=5m, but it is true if the cave is big and have flat ceiling.
Specification: Frequency 100 MHz, 150 MHz, 250 MHz, more suitable is antenna 150MHz.
Current consumed - 0.25A from 12V battery.
Weight - kg 4 with battery.
Underwritten examples a real and everyone can teste it.

Examples:
1. Photo and result of little cave: width 1.5m, length 2m, height 0.8m, the ceiling is 1m deep from surface.


2.Photo, result and plan of the cave: width 1.5m, height 1.8m, the ceiling is from 1.2m to 4m deep from surface.
position a - theceiling is 2m deep from surface
positionb - theceiling is 2.2m deep from surface
position c - theceiling is 3m deep from surface




3. Photo and result of investigation.
Wall - 0.3m deep from surface.
That investigation is with difficulty and can be make from operator with very good experience. Limestone and Dry Soil have similar dielectric constant. To find Limestone in Dry Soil is with big difficulty and have not guarantee to be successful, because the wave can not to reflect.




3500 Euro with software, without laptop.

Download software (demo version) from: http://m12.hit.bg/demo.exe or if can not, send me E-mail.

Hi
I'm bahram .what is your gpr software name and how much price?do you can send to Turkey ?
Where is this software?

[Valchev]

new resistivity meter

My new earth resistivity meter system: https://sites.google.com/site/resmeter/

[Valchev]

3D GPR visualization









https://youtu.be/erEcsgsAkig




https://sites.google.com/site/vgeora...-visualisation

https://sites.google.com/site/vgeoradar/

https://sites.google.com/site/resmeter/

[myonyuntwin]

Do i need to translate for you this block diagram?

[rajesh]

can you explain much more what do you wish

[Lam-part]

https://hackaday.io/project/175115-gprino
Cost up to $ 300.LCD TFT 3.2 inch Uses HX8357 less and less common.JTOS-850VW + ten years ago was good, and now it's phased out and it's hard to buy. What to replace?What suggestions and ideas for improvement?How to make antennas so that they are small?With the current antipodals, a large box comes out. I would like flat normal antennas like in GPRs.

Found one GPR project that can see well in clay.
http://ivansilver.pl/g-p-r-radar-impulsowy/
Cost $ 5,300.
Broadband butterfly antenna with electromagnetic and electrostatic screen. Strong impulses (1.5 KW) and thanks to this supposedly he can see in clay where others are "blind"
It is not a commercial offer. Link with the description of the device for information purposes.

[Valchev]

Hello,

My new HP : https://sites.google.com/site/vgeoradar/

ebay http://www.ebay.com/sch/valchev_gpr/m.html?_nkw=&_armrs=1&_ipg=&_from=

https://www.ebay.com/itm/265069912875

resistivity meter: https://sites.google.com/site/resmeter/

TEM systems https://sites.google.com/view/tdtem

https://www.youtube.com/user/valchevgpr/videos

[sizard]

I thought that here they offer schemes and solutions, but here they just offer to buy.
To the question of GPR Russian YouTube channel develops
https://www.youtube.com/watch?v=DLycM0Dsszk&t=175s