A Registration Of VDI's

[TdG]

Has anyone ever registered VDI's in a live situation? I have found some air test registrations. Especially interested in European ones. In my use of the Manticore, there are appearing blocks of interesting, non interesting and combined VDI's. For instance a VDI of 10 or 11 is nearly all ways foil of chocolate etc. VDI's around the 20/21 are pull tabs but also led objects. I was looking int blocking out, or the other way including some especially. I will most probably have some permissions on some building sites with some pollution over old ground. I am looking for a way to scan the sites quickly as they most probably will be open to detecting for a limited time. Building is quick these days.

[fishersari]

For me I just do the mental discriminations/blocking..  blocking out certain or multiple VDI does interfere with overall tonal language imho.. Im using 5 region all tones btw and not to mentions the vdi examples that you provided were also where the gold resides.. If you looking for coins, I suggest just open up the related coins VDI, +/- 5 VDI... the same coin on-edge, co located with another nonferrous/ferrous, different depth and mineralizations will gives out different VDI. As many and more experienced detectorists here always said there will be a trade off.. 

[TdG]

3 hours ago, fishersari said:

For me I just do the mental discriminations/blocking..  blocking out certain or multiple VDI does interfere with overall tonal language imho.. Im using 5 region all tones btw and not to mentions the vdi examples that you provided were also where the gold resides.. If you looking for coins, I suggest just open up the related coins VDI, +/- 5 VDI... the same coin on-edge, co located with another nonferrous/ferrous, different depth and mineralizations will gives out different VDI. As many and more experienced detectorists here always said there will be a trade off.. 

TY, I know about the 'small' gold, but the chance finding it is too small to be interesting for now. I am trying to make a special setup that makes, that a target is as good as possible a good target to save time. Due to the options of the detector it makes my mind think about so many options. For instance, what if you do not define a volume and pitch for a certain region of VDI's, what will happen. Will it fall silent? 😄 

 

[GB_Amateur]

5 hours ago, TdG said:

...What if you do not define a volume and pitch for a certain region of VDI's, what will happen?

Have you read the Instruction Manual?

[TdG]

On 4/7/2025 at 2:21 AM, GB_Amateur said:

Have you read the Instruction Manual?

Yes I did, but it is not about programming, it is about the technology and how to use it efficiently. I now walk the detector without threshold, Iron sounds off and a 5 tone that I changed. Id's 1-17 no volume. The rest divided in groups fitting the places I hunt. Reasons, I like my peace and quiet, but mainly I do not like the dips in the threshold, there is so much trash (old, but trash) that it dips nearly every second. The discrimination is set as per the Freestyle program, trashy roman areas. 

It is a way to run it quiet and gives me opportunity to see if I can hear the better tones in between the rest of the noises. Today for the first time I thought, I am getting there. The only problem that can't be solved is the VDI region of 19-21, that is where a lot of the lead comes in. But we have marker leads for cloth and other stuff, I like those. Today I dug about 25 peaces of lead, different sizes. 

Yesterday I had a 2 stuiver peace from Zwolle, 1680, very close to some old copper piping. The piping (30 cm long) came in at around VDI 90. I had a coin weight coming in a a disturbed signal. 90-34, changing positions lead to the conclusion there was a more or less stable signal from 31-35 in between the rest. I am happy I dug it. 

[Detecting with CM]

Pretty old coin. Could you post a photo of the 2 stuiver please?

[CliveHamy]

On 4/6/2025 at 3:53 PM, TdG said:

Has anyone ever registered VDI's in a live situation? I have found some air test registrations. Especially interested in European ones. In my use of the Manticore, there are appearing blocks of interesting, non interesting and combined VDI's. For instance a VDI of 10 or 11 is nearly all ways foil of chocolate etc. VDI's around the 20/21 are pull tabs but also led objects. I was looking int blocking out, or the other way including some especially. I will most probably have some permissions on some building sites with some pollution over old ground. I am looking for a way to scan the sites quickly as they most probably will be open to detecting for a limited time. Building is quick these days.

Hi TdG

I detect in the UK, typically Devon fields, using the old Nox 800 since it came out, now for a couple of years the Manticore. If you have similar conditions then sorry there is no easy answer to isolating and digging only the good targets based on VDI numbers. I don't bother notching out specific vdi numbers and I keep the ferrous limits wide open. Often I'm in All metal as iron signals may be deep good targets, but when my brain gets tired I switch all metal off.

The problem we have in the UK (and probably the same for the rest of europe) is in the last 2000 years or so, we've had a large variation in the size and composition of our coins (let alone buttons or other artefacts) so any VDI number could be a good target.

The biggest hassle (that it looks like you are finding) is that aluminium gives off a lovely signal (and gives off a target trace along the centre line), but it can come in at anywhere from 1 to 70 on the Manticore, 1 to 24 on the Nox. It all depends on size. Small foil at the bottom end to whole soda cans at the top end with anything in between. The lower numbers cover the possibility of gold jewellery, the higher numbers bronze artefacts, silver and lead. Often alu foil is misshapen and does not sound pure, with the trace irregular, so maybe you might want to ignore low signals that sound/look like that, but hammered pennies register 7/8 on the Nox and about 16/18 on the manticore, so you are ignoring those signals at your peril. If I am in a field near a main road, or used as a picnic spot I may be tempted to avoid digging clean signals close to the surface which may be alu cans & foil, but it depends on my mood. Good high number signals along the centre line and seeming to be deep (so not recent Alu trash) are worth investigating.

I'm finding the 2d trace great. I'm digging everything blob like along or close to the centre line and taking the risk of alu. I'm also conscious that good targets that are deep or small might register high ferrous on the 2D display and may not be iron. Every now and again I'll dig a hole to see if the display changes, and if so, depending on mood and how deep I think it is, follow through and dig it.

I hope that helps. Cheers Clive

[TdG]

On 4/24/2025 at 8:52 PM, Detecting with CM said:

Pretty old coin. Could you post a photo of the 2 stuiver please?

I added one from Utrecht, the Zwolle one is in the attic. I found this one the day before. This is 1679 and in better condition, no more silvers after that.

[TdG]

On 4/7/2025 at 2:21 AM, GB_Amateur said:

Have you read the Instruction Manual?

I have and now I know you can’t in the way I wanted. But I asked because a manual is a great starting point, but experience is good for creative solutions.