Got permission from a friendly headmaster of a nearby 1800's private school to detect on his playing field with my Simplex+ in field / park mode.
It was very hard work! An extremely trashy area of the worst kind - aluminium! Aluminium foil, full cans, bits of cans, ring pulls. All coming up with just about every ID possible. I kept a log below:
18,19: Small piece of alu foil
24: Alu foil, medium size
27 - 29: Alu foil
29: 10p on surface (1992)
28-31: Alu can (approx 4 cm)
32,33: Alu can
42,43: Alu can, large piece
46-48: Alu can, large
49: Alu can, small thick
55: Alu can section
60-62: Alu can, large
63-65: Steel white bottle cap
67,68: £1 coin (1996)
70: Steel zip
74,75: Alu can, full can crushed
79,80: Alu diet coke can (full)
83-85: Steel bottle cap, Carslberg
88,89: Old copper? hinge, thick, almost 20" deep!
90: 1p (2017)
90,91: Red & white bottle cap
I couldn't really hear much of a discernible tone difference between the various aluminium but then again I didn't have my headphones with me.
Does anybody else have a lot of trouble with aluminium? It just seems to flood the whole ID range from 18 to 80.
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You have the added problem on a school field of the lawnmower shredding any cans that are left in the grass
Well done for going at it, but its going to be a slow project
Sometimes the size of the target might indicate a can, but i think its going to be a patience game with that field
There probably is some 19th century coinage in there somewhere but discriminating it out seems nigh on impossible. Time to find a different field I think.
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We managed to winlke out three coins between the two of us. There will be stuff to be found, but all that trash gave good signals that couldn't be ignored.
Minelab Equinox 800
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That's the conclusion I came to. Some sites are simply impossible to detect, no matter how hard you try. Lots of can-shred is my bete'noir on some sites too Call it a day and move on.
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Perhaps a change of name lol, might bring you some more luck eh - only joking.
Depending on what depths the aluminium was coming up from and if its an easy site for you to get to ( minimum effort travelling to etc etc); what I'd do is go back to the site with some plastic pegs and some string and grid out a small likley area.
Then go over it slowly and carefully removing as much green waste as you can, then go over it again and again until you start to find your good targets.
Mind you I do like a challenge!
On the other hand if you have other permissions - go there!
A bit of research on the parks original layout if you can find out may be helpful in where you start gridding.
Nil desporandum and all that.
Oh and ps, a headmaster always likes a student who tries hard .
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If there are several beeps every swing its gonging to be hard going
I have a small field that's full alloy pie cases , pop cans and cigarette packet foil. After about 70 hours its now just like any other field.
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Pupils were probably from well off families and may well have had Silver coinage rather than Pennies, Halfpennies. Just need to clear all the modern from on top.
20" on the hinge is very impressive.
Garrett 400 I
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I know what you mean but you have to discriminate blocks of 5 ID out on the Simplex+ so I'm not sure there would be anything left! I guess a lot depends on how much the ID changes depending on depth / orientation / size of target. Seems to be quite a bit from my limited experience (even after thorough ground balancing).andyc823 wrote: ↑Sun Jan 12, 2020 4:46 pmThis might be a silly idea. but I'll throw it out there anyway. I have the Simplex+ too and it lets you discriminate aut as much as you like. So how about discriminating absolutely everything, then un-discriminating a known target you'd like to go for (a pre-decimal penny for example) and see what you can find that way. You might still dig some of the trash, but at least you won't dig all of it.
One thing I don't have is any silver to test the ID on. Does anybody know where silver typically ID's on the simplex?
You are not wrong there! What I have found is that it's the size / thickness of the aluminium that seems to change the ID so much, really can be anywhere from 18-80. I've never had alu come up above 80 though.
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