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#1

bhogg
Member
Joined: 10 June 2015
Posts: 92
Member
29 July 2017 07:18 pm

Hi All

I've been detecting in mostly high trash areas eg football grounds with about 90-95% trash which
is getting quite disheartening to say the least, So anyway I'm after some Australian coin numbers
mostly pre-decimal numbers as I haven't really found any apart from a couple of penny's no silvers at
all, I going to have to start hunting at older sites and sites like old churches and similar places that don't
have the trash that the local football clubs have.
So if anyone could please share some VDI numbers for current and pre-decimals that'd be greatly appreciated.
Thanks for your time and help it's greatly appreciated

Regards
Bhogg

#2

Ridge Runner
Member
Joined: 04 September 2014
Posts: 5,603
Member
29 July 2017 10:04 pm

Well what settings are you using and what coil are you using, what tracking settings and which mode are you using etc,

You should be able to pick what is junk and what is not,

John.


Dig em all,

#3

bhogg
Member
Joined: 10 June 2015
Posts: 92
Member
29 July 2017 10:43 pm

Hi John
I'm using the eclipse 6x10 mostly. I've just been using relic mode , discrimination on 3 , gain as high as conditions permit but due to the places I've been going having so much junk and next to no coins it's been a hard slog obviously these areas have been hit very hard by others before me, and because I haven't found even 1 silver pre-decimal yet I've got no idea what numbers they come up as so I'd been digging pretty much everything just in case. The other day I dug 150 targets and found two 50 cent pieces and a $1 coin, was just hoping someone might be able to give me a coin chart for the MXT numbers for OZ coins so I could use as a guide only. Pull tabs are a pretty solid 24-26 VDI consistently I also worry I'm going to miss rings or other valuables, but if I'm only hunting for coins only would just be nice to know all the VDI coin chart and also to perhaps discriminate some of the junk out while coin hunting would also be a bonus but still not 100% sure on how to do that I know it's got something to do with the musical note symbols on the screen but I've never played with the note symbol before.
Cheers mate

Last edited by bhogg (29 July 2017 10:47 pm)

1 user likes this post: Ridge Runner

#4

Ridge Runner
Member
Joined: 04 September 2014
Posts: 5,603
Member
29 July 2017 11:58 pm

Well I know many people rave about the 6x10 but I am not a fan it is ok for hot ground. but it can be too hot at times, if your GND readings are below 75 I'd be using a concentric, they ID junk better and you use/need less Disc to wipe out junk/Iron.

Silver will come In in anything from the high 60's low 70's upwards and larger Copper coins will come in up to the mid 80's and modern coins come in at anything from 14 to the high 80's and pre decimal .500/50% silver coins will come in at around 52 an up, Which is a Bugga because depending on which era of pull tab it is they can come in at anywhere from about 10 up to about 26+/-,

What you need to do is carry a small note book and write a list in the right order of what Aussie coins come in at on the ground in your garden/yard. and when you go out keep it with you so you can cross check the ID's and that will speed up your learning and after a short while those numbers will become locked in your head, I carry one even now, even though I can tell what things are before I dig them, So give that a go, Coin and jewellery hunting is totally different from Relic or prospecting, So you need to get a note pad, No one here ever recommends using one, heavens know why because it will really speed up you hunting and boost your finds rate and Lower your junk rate until you can work it out in your mind, If you gave your machine to a complete novice with that note book that would speed up their finds rate In just 2 or 3 weeks and wisdom by about 6 months and within 2 to 3 weeks they would be whooping you, And not only that you should write down your settings in the back of the book and the depth details and what the find was for future reference,

Your detecting is being hindered by having nothing to compare your signals with, IE you dig a pull tab and the meter says "14", and you dig another and it says "18" and again and your up to "26" and then you dig the tail from one and it say "8". Yet any two of those numbers could be the same type of pull tab but why are the numbers different ? "Simple" the Depth. The Angle they sit at in the Ground, Is there Iron close by or near too, Classic example of that was my Etrac without digging the target it could give me 7 or 8 and even up to 10 different sets of ID numbers on the one target and the MXT and the Deus or the V3i are no different, because the angle and ground conditions and near by targets Good or Bad can all have an effect on your ID numbers,

The Skill is working out what the target is before you dig, Does it give a double bleep one way and a single one at 90* to your first sweep well that is sure going to be a long piece of non ferrous junk like a stretched out piece of can slaw or wire or copper pipe etc, or Does it give you a nice sharp bleep one way and a low tone the other, you just know that that bugga is going to be Iron, These things you can remember but with the good targets you should write them down as I said above,

If you use a note book and learn to trust the machine you will speed up your finds rate, and if your GND numbers are below 75 then use the 9.5/950 coil or the 12".300 Coil because you will get down to the deeper stuff, With the 950 coil I have personally dig Pre Dec Pennies at over 13 inches and I have never dug a coin over 8 or 9 inches and 10" is all you will get with a good Tail wind with that 6x10,

Do the Maths on the Coil 6x10= 6+10= 16 Divided by 2 = 8. So 8 inches is the average depth that you are going to get from that 6x10 coil on Coin sized targets remembering that that is the best results that you can expect from a DD coil of that size, A concentric coil can easily see to about 1.5X it's size in to the Ground, My more realistic View is a safer 1.3X it's size in depth.

So at 9.5" X 1.33 = 12.635" in depth on a coin sized Targets and again I have already dug large pennies at 13"+/-, Now compare that to what the 6x10 is doing. Not to mention the target ID etc. The 6x10 is ok for prospecting and it has good target separation too "IF" you are sensible with the Gain.

Even the Factory 10"DD will go deep too, but like all DD's target ID/Iron can become a problem,

I hope this helps and if you get stuck come back here and we can thrash it out, trust me it is really not that big an issue and very easy to solve.

Good Luck.

John.

1501328927_whites_vdi_amp_gb_chart.jpg

Last edited by Ridge Runner (30 July 2017 12:50 am)


Dig em all,

1 user likes this post: Kozi M

#5

silver
Member
Joined: 19 December 2013
Posts: 15,426
Member
30 July 2017 09:04 am

Just gotta make sure of your permissions and that your not leaving a mess hey. smile


What a great day ! ,... " I'll see you in the field ".


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