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Offline Dell_Winders
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« Reply #10 on: April 17, 2009, 10:12:52 pm »
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Quote:Posted by {author}
How far down will thoes Malas go ?


It's going to depend greatly on ground conditions, the size of the target, and the antenna you use.

In the photo above the  Mala, was used in sandy soil, which gives good conductivity for GPR, and the cavern was about 30 feet below the surface. The deepest point in the cavern was about 11 feet from floor to ceiling, with a rise to about 3 feet from floor to ceiling near the center.  Dell

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« Reply #11 on: April 18, 2009, 05:39:43 am »
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Dell
          Can you tell how far from the surface the top of the cave is  and can you tell how deep the cave is ?   I suppose you can locate old water ducts or old sewerage tunnels ?
           It would be ideal to locate underground faults before you planned a building project .
           I worked on a dam project once that had limestone caves underneath , they found out about them after they drilled test holes .  They drilled 20 meters down  and the drill dropped 50 meters  it was too late to abandoned the project so they had to pump grout down into the cave , dont know how much grout they used .

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Offline Dell_Winders
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« Reply #12 on: April 18, 2009, 10:01:25 am »
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GPR is being used more and more for utility locating in the US. Often cities, and municipalities have old sewer, water, and gas lines  that are unmapped. Contractors have to know their exact locations before they can do  vertical or horizontal drilling.

GPR is not alway a solution, because it has it's limitations, so it's use  is only practical  operating under certain conditions.

Some GPR software has presets that you can enter the grid dimensions, and the graph scale  will show the anomalies at the approximate depth.

I have a Zond 12 C GPR, made in Latvia. The Photo of the Mala GPR, I posted,  belongs to friends I work with. It has Bluetooth wireless, so you don't have to use a cable. It's a nice feature.

Being technically, and computer illiterate, I prefer the less complicated, and larger scale imaging of the Zond, software.   Dell

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« Last Edit: April 18, 2009, 04:54:55 pm by Dell_Winders »
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« Reply #13 on: October 25, 2009, 01:38:34 pm »
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hi every one.what about the price and can i trust this mala gpr in aheavy minrlized area.and also can i use it whit out wheels in non flat soils.                                      thanks

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« Reply #14 on: October 25, 2009, 02:50:26 pm »
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Wet minirlized soil and hot rocks are the biggest challange for any GPR.If you need to go deeper you must sacrifice resolution.
Reading and analyzing data is an art and needs a lot of experience to get sharp results.
Wishing to hear good news and happy hunting.

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« Reply #15 on: October 25, 2009, 02:54:28 pm »
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Hi Christian
thats one hell of a nice bit of kit Lucky you, we hired something similar out to survey the Enclosure of the Ark Site and it worked beautifully for me.  However when Alan Wilson took another person to the site to use it the guy either deliberately or accidentaly pulled the unit over some large rocks which broke a very heavy cable underneath.
That put the unit out of action and had to be returned for repair.
I could only work weekends and Alan Wilson wanted to do it during the week when everyone was at work he doesnt like people watching what were doing.  When I had the chance to use it I drove my car up the hill as far as I could before assembling the unit.
There were four or five drainage holes that had been built into this hill to protect whatever they (the ancients) had buried or hidden there.  Those drainage holes showed up very clearly on the GPR screen so there are several ways in if your good at tunneling.
A word of wisdom here if you come across an anomality like that follow it in all directions then take bearings when you know what direction it goes.  Im sure your going to have a lot of fun playing with your new toy hehehe Im envious not really been there dont that sort of thing.  hehehe good luck and I hope you make some great finds.  You only get what you pay for and a bad worker always blames his tools. So do your research first then investigate and get permission with a written contract.  enjoy

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« Reply #16 on: October 25, 2009, 03:47:59 pm »
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Hi Alan
         I wish if you can help analyzing these slices.
  Many thanks.

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Offline Alan Hassell
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« Reply #17 on: October 25, 2009, 07:15:40 pm »
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from a very quick glance it appears that you are searching an area that has a load of post holes in it indicating the presence of an ancient building or round house I think theres more to this area than what you are showing . mind you I could be wrong because GPR's and the signals given off are completely different to the machine i used.
Does your instruction manuals give you any indications of colour representations? The one I used was monochrome ie black and white.
Without the manual which as you know is quite a thick and well documented manual in itself Im only guessing but there is something there in the right circle what it is I dont know even the experts with time team can only make assumptions.
the last slice indicates a ditch or possible foundations to find out exactly what you have would require an open cut trench.
Those two rings are potential post holes then again I cannot see the scales on my monitor so I am guessing again but at the same time trying to be helpful even at the risk of being wrong.

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Offline ChristianTopic starter
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« Reply #18 on: October 25, 2009, 07:38:15 pm »
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Alan, your images are not from a GPR but eitehr have been taken with a Magnetometer or Gradiometer.

Regards

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« Reply #19 on: October 25, 2009, 10:31:20 pm »
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Thanks so much Alan for your post and your effort to give help.

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