I have ask this question on here and on another forum and never get an answer. On the ground probe screen I have a ground phase angle number of 174 for all three frequencies and a VDI number of -91 what does that tell me about my ground MILD, MEDIUM or Heavily minerized ground?? I need a starting point. Is there any of this info written down somewhere??
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Ground Phase #s
- Thread starter hang7575
- Start date
Larry (IL)
Well-known member
I sure did and here is the link to your first question. Within that link is another one right to the White's engineer AK1234 answering your question in more detail.
http://www.findmall.com/read.php?66,1005883,1006034#msg-1006034
A ground phase of 174 is what I would call highly minerized.
http://www.findmall.com/read.php?66,1005883,1006034#msg-1006034
A ground phase of 174 is what I would call highly minerized.
Larry (IL)
Well-known member
The ground phase # will help with the filter selection. That plus your swing speed. The ground probe on the sensitivity live control will help with the gain selection. I'm pretty sure the ferrite bead represents a pure iron target and your ground is pretty close to that. I would suggest leaving it in the factory preset unless you swing the loop real slow and then I would go to a lower #. The best way is to bury a coin and try the filters to see what works best for you in your ground. I like mine set at 5 Hz High.
I've read AK1234's post on Ground Phase numbers and it does make sense to me, BUT...is there a reference chart on how these numbers relate to what type of ground you have? For instance, If I come up with 165 degrees is that low, moderate or high mineralization? If the ground goes from 0-180 degrees, is closer to 0 very low, 90 moderate and closer to 180 very high? If that is the case, it would make it fairly simple to figure it out on our own, but I'm not sure if that is the case.
Larry (IL)
Well-known member
From what I gather from her post is Iron is 178 and salt is 90. If you are an old DFX user, that would translate to Iron as -94, DC phase, highly mineralized and 90 on the Ground Phase # would be equal to 0, DC phase, salt water on the DFX. Until we get more specific info on the ground phase # from White's or Jeff Foster, this will have to do.
Did some comparisons with the DFX, and you are correct. The ferrite bead (representing ferrous ground) read -94.2 on my DFX and -94 (for the VDI number at the top) on the V. Salt should come in on both with a VDI of about 0. The angles for the individual frequencies are in degrees rather than VDI units. The VDI number at the top is just the ground phase normalized fto standard VDI (which is what the DFX had). VDIs from 0 to 95 are nonferrous targets (coins and such).
But when talking about how mineralized the ground is, wouldn't you want to take into consideration the signal strength too? If you have ground coming in at -94(VDI) with a signal strength of 2% and another ground coming in at -91 with a signal strength of 7%, it would seem to me that the ground coming in at -91 is more mineralized even though it is a less negative VDI. But, maybe I'm way off base for the question.
But when talking about how mineralized the ground is, wouldn't you want to take into consideration the signal strength too? If you have ground coming in at -94(VDI) with a signal strength of 2% and another ground coming in at -91 with a signal strength of 7%, it would seem to me that the ground coming in at -91 is more mineralized even though it is a less negative VDI. But, maybe I'm way off base for the question.
hang7575 said:
Thx Carl and AK...so if hang7575's assumption is correct(and it sounds right to me) then can a chart be developed that shows signal strength and how it directly relates to severity of the ground? For instance, but by no means am I stating this is accurate...0-10%=low mineralization, 11-25%=moderate and 25% on up = high/very high. Thoughts?
duclaw said:
Bob says your numbers are close to how he'd classify mineralization. And since the numbers are subjective as to how different people might classify their mineralization, seems like that definition is as good as any. He also mentioned that the higher the mineralization, the slower one should sweep - which may mean a different filter should be selected. Typically the slower the sweep speed, the lower frequency filter should be used. But there are other variables that can affect all this (or so I hear), so the live controls can be your friend to quickly adjust your detector for optimum performance in your conditions.
Neil in West Jersey
Active member
ak_1234 said:
Funny, but I would have thought the opposite; the higher the mineralization, the faster the sweep should be..
ak ill take thaT to mean youre saying my above statement is true? lower mineralization , lower filter, slower sweep?? np on the oooppps just want to clarify for people like myself that get confused easily. gettin up in the years i like to make sure even thought it doesnt seem to stay with me long
Larry (IL)
Well-known member
At least the first two are correct. The sweep speed is pretty tolerant, I think. If you want to hear the very deepest of targets, you have to slow your swing speed down, otherwise just use a swing speed that is comfortable for you.
thanks larry for the reply,,, the v3 is an awesome machine and reminds of tryin to figure out these dang computers hahaha evreytime you fire it up you find something else it can do. i really enjoy getting out whether i find things or not but i hate to come home after covering a good piece of ground and find out i shouldve done something different. like slowing down. i have gone to the 5 filter numerous times with a slow sweep and had good results. the machine has no problem finding coins. i found a very small dove peace ring at 6 inches it vdi 51 solid. i think my next obstacle will be learnin how to utilize the ground probe from the tracking screen for optimal use. thanks for the info.
Larry (IL)
Well-known member
It sounds like you are doing everything right John and that V will give you many years of pleasure. Learn it one step at a time and above all, go out and just plain have fun hunting.