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MXT is no so noisy

A

Anonymous

Guest
I have MXT for only 10 days.
First time i have tried to search near my house (four century old) were the ground is plenty of iron (nails, foils and so on...).
In this place MXT it seemed too much noisy....
In truth were MXT it made signals, i have dug and i have ever found something (nails, little pieces of iron, little foils).
In another place, were there's poor trash i noted that MXT is enough silent.
I Think that when MXT make signal, often there is something and little times this is due to a false signals by mineralization.
A question, i noted that with discrimination near preset position, and in coin and jewelery mode, MXT make a clear sound even if VDI number is negative (iron verified with digging). It happens only when iron is underground not in surface.
How i can set discrimination to eliminate sounds of iron when VDI is negative?
Hello,Andrea
 
Andrea,
The problem with buried iron is that the response from it can be quite broad in the VDI spectrum as you swing the coil. On the DFX signal graph, this shows up as a broad band of responses on the bottom of the LCD. The MXT unfortunately does not have that feature.
So, what happens is that as you swing over the buried iron, you will hit a place where the instantaneous VDI reading is above the DISC level and the MXT will sound off.
One way to deal with this is to go into pinpoint mode and profile the target. In general, iron will have a broader response than a coin sized target. After locating the target center, position the coil's edge over the target and take another sweep in DISC mode. The MXT will most likely now read that target as iron.
 
Little bits of foil and aluminum and the like tend to be flakey in pinpoint as compared to a larger coin like signal, i think once you have dug enough good targets you will be able to tell the difference. Any more for me those small shallow surface targets have their own sound. Also they will give you a deep depth meter reading when they are just below or on the surface.
 
When I detect old home sites where there is alot of man made iron and or ground mineral I always use the Relic mode, dis set just below nickel, finger switch in the center, gain depends on how the MXT is running, if not stable I lower gain, if stable I will crank it up slightly to see what happens, a little movement of gain can make a big differance at old home sites. At these spots I am always fine tuning the gain for the best performance.
Whites is going to hate me but I have change the mode names on my MXT, I call Coin and jewerly my {cherry picken mode} I call Relic my {down and dirty mode} I use the whites 3"x6" mini as my main coil because old home sites is where I do most of my hunting, I can't say enought about the Mxt in the Down and dirty mode, {Relic} once you learn what the Mxt is saying to you. wnen detecting old home sites go slow so the Mxt is not talking like a speed addict, most of my good finds come from coins just on the sides of iron pockets, notice i said finds, not hits, around iron pockets the Mxt will give a good choppy hit along with a iron hit, if the good signal is on the left side of the hit followed with a iron signal I will go clockwise round the target 180 degrees put the Mxt on lock and try to isolate the target with a sweep on that side of the hit.
If you dont put lock on the mxt will ground out the traget at about 3-4 sweeps.If I get a repeatable broken good signal on the edge of an iron pocket I will dig and check, now i have pulled alot of junk but i also have some good stuff that others have passed over as iron, the better I get with the mxt the more effie signals i seem to dig and it pays off.
If Im at a ball park and just looking for fresh coinage dropping I switch to cherry picken mode, {coin & jewrely mode}......
 
I dont turn 180 degrees,
I turn 90 degrees at a time to try to isolate the traget but I always turn 90 degrees to the target side.
 
Andrea,
What is your GND reading when in Prospecting Mode? Also what coil are you using? This will help us give you the proper suggestions to help you with your problems.
 
400 year old house? Where do you live? And who built it? I want him to build me one too! <img src="/metal/html/wink.gif" border=0 width=15 height=15 alt=";)">
 
Yes, approximately 400 years old.
I live in Italy, and there are a lot of house more ancient than mine.
For example, my town was founded by people more ancient of antique romains (600 B.C.), then romans town (299 B.C), and so many other town, but the actual structure is medieval.
An example of my town momument (Rocca dell'Albornoz 1370)
Andrea
 
So where is your picture? Can I come over to detect?
Wow. Just keep using your MXT, it is one of the best, you will eventually understand it. What coils do you use on it?
Mike
 
The picture is in Narni (centre of Italy, about 80Km from Rome). Unfortunately in archaeological sites is strictly forbidden to detect.
I use the standard 9.5 coil.
Andrea
 
GND reading in prospecting mode vary in average from 45 to 65 and it depends on place. In some places with red clays 75 too.
I use a 9.5 standard coil.
Andrea
 
There is your problem, the 9.5 is to big for trashy areas. It is concentric, meaning the sigal is cone shaped-- covers the whole face of the coil then goes out to a point. Put it in prospect mode and move a coin around the face of the coil far and near. You can see how the electrical field is shaped this way. Its like hunting with a funnel pointed towards the ground. If I were you I would get the 6x10 DD coil. DD stands for double D. The field on it runs only in a straight down the middle of the coil like a straight line from one edge to the other edge Then it goes out evenly clear acrosson that straight line. It like hunting with a windshield wiper blade. It seperates good targets from trash much better. You can email me if you would like lots of information, that way it won't tie the forum up.
P S
I think the readers are all wondering what the lady in Italy looks like. I know I am> My grandparents came from there, my mother is 100% Italian.
 
Andrea,
As you have already been told by others, you want to look into to purchasing a DD coil. If you will do a search of past posts, you will find some good information explaining the benefits (and limitations) of this type of coil design.
 
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