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Offline mikeKTopic starter
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« on: December 12, 2009, 09:15:11 am »
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recived my new minelab x terra 705 yesterday,came with the 10.5 DD coil,why is it so hard to pinpoint with this coil?,I end up digging massive holes,dont want to leave my park looking like the moon after detecting it,(I do fill in the holes remove the junk,and leave the area as clean as I can),my first find yesterday evening was a lovley silver st christopher with the words god protect you on the back(will post as soon as I get my own pc rid of the nasty virus),great first find with the 705,problem is the coil,went out this morning and used the 9"concentric a lot better pinpointing,?2.60 mind you it was snowing so did not get that much time in,dose the DD coil realy go deeper and is it better in the park?,Im not realy sure if the 705 is realy deeper,I found the 305 on high sensitivity realy good on deapth,and was realy happy with it,is there realy that much diffrence between the 305 and the 705 I ask my self,do you realy need 4 patterns (discrimination),look forward to your feedback...thanks mikek

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Offline GoldDigger1950
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« Reply #1 on: December 12, 2009, 03:21:16 pm »
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Mike, the double D coil is an odd beast. The sensitivity is along then entire length of the center overlap. That is, the entire center of the coil from the top to the bottom along the overlap of the two coils. This overlap gives it extreme depth for all targets but makes pinpointing a bit hard. It takes a bit of practice but here's the basic technique.

Along the coil swing, you get a target. If you were to place the coil down on the ground at that moment, your target would be somewhere under the vertical overlap of the two coils which are laid side by side as two letter Ds, one reversed. Hence the coil name. Since the coil is 10 inches in diameter, that means the item is somewhere in a 10 inch line directly under the coil. It could be left or right of that by about an inch or two making digging an onerous task.

The method of X-ing the target is the fastest way to learn to pinpoint. You first go in one direction, find the target, then swing the detector in a pattern that is 90 degrees from the original swing. Where the two peak detection areas overlap will be marked by an imaginary X which is the precise location of your target. The first few hundred times you do it, you will improve to the point of needing less and less of an angular differential during the swing. I now use only the briefest of figure 8 patterns to isolate a target under the Double D coil.

A tip. Because of the human eye and its characteristics, you can give yourself an edge. Put a green or red fluorescent dot on the exact center of the vertical overlap of the D segments. Defocus your vision but watch the coil as you swing it in the X pattern or figure 8 pattern. Quickly move the coil away while still staring at the ground and a negative image of the dot pattern will leave a sort of floating image on your retina that will be seen superimposed over the ground in front of you. This squiggle of light will mark your target perfectly. After a while you can dispose of the dot but it will amaze you with how well it aids in learning. If you use a red dot, the squiggle will be in green. If you use green, the squiggle will be red. Your retina retains a negative of the color.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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Offline mikeKTopic starter
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« Reply #2 on: December 13, 2009, 07:56:19 am »
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thanks for the tip golddigger,I just need time with the DD,mind you it is a heavy bugger to swing around,not sure if the depth is that much better,I find the concentric 9" on full sensitivity realy good,mind you It only works in clean areas,going mad to get out and have a bash with the 705,(too much amber necter last night),a dig in the cold would do me good.What do you think is there a big diffrence in the xterra 305 and the 705 for park hunting? with 4 discrimination patterns there is no real need,mind you it is a very sensitive detector,more of a prospecting machine,so lets see how good it is on the small silver coins over here(some of these coins are wafer thin and ca 6mm long),thanks again for the pinpoint tips golddigger,will let you know how I get on with the DD,just hope the weather picks up a bit,cheers mike

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« Reply #3 on: December 13, 2009, 10:11:46 am »
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Hi GD

Nice pointer that DOT I will use it too

Thanks  Smiley

Regards
Xavier


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So many questions so little time

Offline GoldDigger1950
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« Reply #4 on: December 13, 2009, 01:28:27 pm »
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Mike, my Minelab is a basic model with no discrimination available and I do just fine in park hunting. The Australian penny of old is as large as a US half dollar and seldom found. The modern penny is small, about the size of a 1 pfenning coin. The 2 cent coin is about the size of our 5c piece. I find both in abundance at depths that always astound me. I have no experience with your model except that it's on my list of models to covet.

What the Double D will do for you is give you better coverage per sweep in addition to slightly more depth. The field of detection is greater since the sensitive area is much larger and more blade shaped. Imagine it being a sailboat keel beneath your coil rather than a funnel shape. With the Double D you will miss fewer targets and will detect gold and silver at an astounding depth. With practice, your pinpointing will improve.

Xavier, that little dot is really useful when you are teaching someone else how to use a detector. I still have times when I put them on.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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