looking for home-made G.P.R.

[Guard]

To SOK.

You dont need 40 meters depth gpr.
You need only to find the entrance to ancient mine.
Try a 8-16meters depth gpr (31-63Mhz) is a good choice to find the entrance and hope close to entrance that exist a room rather large say 3x3meters or biger for greater representation to laptop.

Dont believe in miracles !!!
Και μην ακους παπαριες !!!

[Valchev]

Hi Sok,
I think Guard is right.

I can't afford to buy an OKM detector

If You find money for GPR do not buy from OKM. OKM do not produce real GPR, onely advertisements and useless machines. If you think that commercial GPR are better, buy real GPR from:
http://www.radsys.lv/ , http://www.sensoft.ca/ , http://www.malags.com/ , http://www.geophysical.com/ .............

If you think you can help us here by selling us a working machine in reasonable price, we'll buy it. But if we won't be helped with your detector, I ll return it back to you and you will give me back my money.(we can sign a contract for that). Or you can come here to our site and work with us and your equipment to find the entrance and take your share.

No guarantee that any GPR can help You. Excuse me, I have not so much time.

[SoK]

Hi Valchev.

I discuss the problem with my team and we probably will buy your GPR. Give me a working email to talk about the transaction details etc.

I wright down for count the price of your GPR as 3500 Euro with software + postal courier etc.

Do you have 1 unit ready? If not how long it will take to make one? or We can buy yours with better price?

Is there any manual (documentation) for the use of the unit? If not please make a draft one so we get the idea how to use the detector, and how to recognize the graphics as materials (colors, depth, etc.)

Thanks

[Valchev]

Hi Sok,
My emails: [email protected] , [email protected] , [email protected]

To make a GPR for You I will need more than 30 days.

short manual: http://m12.hit.bg/gprmanual/gprmanual.html

more about the depth and the graphics: http://m12.hit.bg/gprmanual/gprdepth.html

It is better whеn You buy the GPR to come in Bulgaria, and you will test (learn and work with) GPR on the real object, the cave that you can see on:
http://m12.hit.bg/gpr_eng.html

It will be low cost for You than postal courier.

[Unregistered]

Hello Valchev,

You wouldn`t happen to know where one might be able to get a 1GHz DRO module (gunn diode/gunnplexer diode) from?

Thanks

[Valchev]

Hi Unregistered,
I do not know, sorry.

[Valchev]

On the next picture Sok test the GPR on real object - cave. The picture is put with permission of Sok.

[Valchev]

Video - GPR survey, non flat ground surface. The surface have
displacement (unequals) from start point to end point more than 1 metre.
Detecting a cave (tunnel) in limestone width 1.5m height 1.8m, the
ceiling is 2m deep from the surface.







GPR + auto

[Valchev]

More videos and photos links will be add later on:
http://gpr.netfreehost.com/gpr.html

[Valchev]

GPR with antenna 200MHz and special GPR with antenna 35MHz

[suxfan]

Sampler ?

Hi

I think you use a samling strategy like (b) not like (a).
In case (a) you would need a ADC with giga samples
per second (Gsps) in case (b) only kilo samples (ksps).
(c) i think schows the function of of the Sampler, so
In your block diagram the graph shows not the true
behavior at the output of the sampler. The signal is
not spreaded analog (continuously in time and value)
from 60ns to 55ms.

Best regards

Hi,
Do you know any link or any example circuit diagram about this sampling method ?
https://www.geotech1.com/thuntings/a...1&d=1137761740

[Dirk]

subsampling

Here you find a noise based radar system using subsampling.

www.meodat.de/images/IM-9455.pdf

What you need is a sample and hold circuit with an input bandwith
bigger than your signal bandwith and a holdtime wich is longer than
the conversion time of the DAC.

If price is no matter, you may try RTH030

www.teledyne-si.com/highspeed/files/DS_0078PB1-4006.pdf

By Dirk

[Valchev]

UWB - video lecture

UWB - video lecture

http://www.youtube.com/watch?v=mqq9HrLqYJY

[david]

HI SOK

HELLO SOK. PLEASE LOOKING THE WWW.imagelocators.com EXAMINER THE BEST GPR AND ARCHEOLOGY AND METAL DETECTOR FEREQUNCE 137 Hz DEEP 40 METER I BUY THE ONE EXAMINER IT IS A VERY VERY BEST SYSTEM AND REALY IMAGING SYSTEM I TEST EXAMINER IT IS A VERY GOOD... I FOUND THE ONE CUP IN TO THE 3.40 CM .BUT OKM JUST FOUND THE MINRAL AND STONE AND TRASH BUT EXAMINER JUST FOUND THE METAL AND CAVE BECUSE EXAMINER FEREQUNCE WORKING JUST 137 Hz IT IS A VERY GOOD SYSTEM FOR FOUND THE RILC AND ARCHEOLOGY. REAL IMAGING SYSTEM EXAMINER.I WORKING ALL PRODUCTS OKM NO GOOD SYSTEM. JUST FOUND THE TRASH OKM NO GOOD.

[gwzd]

HELLO SOK. PLEASE LOOKING THE WWW.imagelocators.com EXAMINER THE BEST GPR AND ARCHEOLOGY AND METAL DETECTOR FEREQUNCE 137 Hz DEEP 40 METER I BUY THE ONE EXAMINER IT IS A VERY VERY BEST SYSTEM AND REALY IMAGING SYSTEM I TEST EXAMINER IT IS A VERY GOOD... I FOUND THE ONE CUP IN TO THE 3.40 CM .BUT OKM JUST FOUND THE MINRAL AND STONE AND TRASH BUT EXAMINER JUST FOUND THE METAL AND CAVE BECUSE EXAMINER FEREQUNCE WORKING JUST 137 Hz IT IS A VERY GOOD SYSTEM FOR FOUND THE RILC AND ARCHEOLOGY. REAL IMAGING SYSTEM EXAMINER.I WORKING ALL PRODUCTS OKM NO GOOD SYSTEM. JUST FOUND THE TRASH OKM NO GOOD.

Probably their products give the same errors as their web page:
Error 404 Page not found = Scam 404 Treasure not found !
Regards