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Does VDI number drop with depth on F75?
- Thread starter Canewrap
- Start date
tmanfromtexas
New member
I posted last night that I got a 85/87 signal at 12 inches in pin point. Turned out to be a penny at 9 inches. I think that the only thing that would affect the numbers to lower would be trash above or next to the target. Last weekend, I was getting low 60s and high 50s on a wheatie at about 7 inches. I pulled several pieces of foil out of the hole that was above the penny. TMAN...
there is a co-located target.....and then the F75 will UP average on the ID. While some might not like that....its a GOOD thing. 
A good example is if there is a low conductor like a rusty nail close to the target at depth............AND your accepting nails (low disc setting). Most detectors will down average an ID at any depth.....and due to loss of signal.......AND the proximity of the low conductor.......will report the good target as iron.....or a VERY low VDI. As the 75 averages up.....and your accepting the unwanted co-located target........the 75 will report the good target at a higher ID.....causing you to want to dig it, instead of dismissing it as junk. This allows you to hear and recover many many good targets lesser machines will pass right over!
When I first got my F75...............I found the high ID's I got on cetain targets at depth annoying.....but as I discovered exactly what was happenning...........it enabled me to recover many many more targets I'd have missed before. You may not know exactly WHAT the deep target IS, due to its inaccurate ID.......but the target will be in your pouch....instead of still in the ground. Since I hunt mostly colonial sites....................I want to dig it ALL..regardless of ID.
A good example is if there is a low conductor like a rusty nail close to the target at depth............AND your accepting nails (low disc setting). Most detectors will down average an ID at any depth.....and due to loss of signal.......AND the proximity of the low conductor.......will report the good target as iron.....or a VERY low VDI. As the 75 averages up.....and your accepting the unwanted co-located target........the 75 will report the good target at a higher ID.....causing you to want to dig it, instead of dismissing it as junk. This allows you to hear and recover many many good targets lesser machines will pass right over!
When I first got my F75...............I found the high ID's I got on cetain targets at depth annoying.....but as I discovered exactly what was happenning...........it enabled me to recover many many more targets I'd have missed before. You may not know exactly WHAT the deep target IS, due to its inaccurate ID.......but the target will be in your pouch....instead of still in the ground. Since I hunt mostly colonial sites....................I want to dig it ALL..regardless of ID.
Everett Cavanah
New member
yes !!!!!! big time
This is weird that we have some saying it raises the numbers and some saying it lowers it. I'm in the lowering it camp. I've posted this before but I can't tell you how many times now I've dug very deep bullets and now I've got a few buttons to do the same thing; that being while hunting in all metal you'll get an iron hit that will jump up into the nickel, tab, and zinc range only maybe once or twice out of 3-4 swings over the target. I've dug a bunch of bullets that have done that. Out of the ground they will read TAB/ZINC nearly 100% of the time, but DEEEP in the ground, at least in this dirt here, they'll read lower. They still have good audio (unless you're in disc mode and then it will be broken if you are knocking out iron) but the IDs are off.
One VERY interesting thing to me though...I just got my wife a brand new F-70. I've been playing with it quite a bit myself. And I like it better than my own F-75. I don't know if maybe my 75 might have something wrong with it or what, that causes it to do the thing described above...but the 70 hasn't done it yet and it LOCKS solid on the VDIs. I think when my wife isn't with me, that I'll but taking the 70 out. I put the big coil on it and it's a hoss of a machine that way.
One VERY interesting thing to me though...I just got my wife a brand new F-70. I've been playing with it quite a bit myself. And I like it better than my own F-75. I don't know if maybe my 75 might have something wrong with it or what, that causes it to do the thing described above...but the 70 hasn't done it yet and it LOCKS solid on the VDIs. I think when my wife isn't with me, that I'll but taking the 70 out. I put the big coil on it and it's a hoss of a machine that way.
I for one will be following your progress with the F70 closely. I too have an F70 I bought for my wife and I played with it before I got the F75. Its definitely a more stable machine, but I didn't find it to have more depth than the F75, but I haven't tried it with the 11" DD coil. As you continue to use the F70 please post your findings.
I didn't get much time on it though. I was letting my Sunday school kids go at it while I supervised and dug for them.
But I did notice one thing for sure. The site we hunted is a big subdivision site. Houses everywhere. The F-75 has had a fit there with going crazy via electrical interference. It really don't matter what frequency it is on either. I put it on F-2 and backed the sensitivity away down to about 60 and got it tolerable. In the same place I was able to run the 70 on any frequency I wanted to, and ran it on 80 sensitivity without it chattering.
I don't think it goes any deeper than the 75 but I do believe it IDs and locks onto things better to the depth that it can detect to. I've about learned the 75 to the point of recognizing those "bounce" signals and getting the deepies. But I do like the stability and menu interface better on the 70. Other than having a bigger coil and backlight...I for the life of me don't see a reason why anybody should buy a 75 over the 70. Knowing what I know right now, if I didn't have either machine but still had this knowledge, I would buy the 70 and just buy the big coil for it. You'd still have money to spare for what a 75 costs.
I never use the static all metal mode.
Don't hunt at night.
And don't coin hunt, so the bottle cap mode ain't of benefit.
The only potential one that I *might* use that the 70 doesn't have, is the plowed field mode.
But I did notice one thing for sure. The site we hunted is a big subdivision site. Houses everywhere. The F-75 has had a fit there with going crazy via electrical interference. It really don't matter what frequency it is on either. I put it on F-2 and backed the sensitivity away down to about 60 and got it tolerable. In the same place I was able to run the 70 on any frequency I wanted to, and ran it on 80 sensitivity without it chattering.
I don't think it goes any deeper than the 75 but I do believe it IDs and locks onto things better to the depth that it can detect to. I've about learned the 75 to the point of recognizing those "bounce" signals and getting the deepies. But I do like the stability and menu interface better on the 70. Other than having a bigger coil and backlight...I for the life of me don't see a reason why anybody should buy a 75 over the 70. Knowing what I know right now, if I didn't have either machine but still had this knowledge, I would buy the 70 and just buy the big coil for it. You'd still have money to spare for what a 75 costs.
I never use the static all metal mode.
Don't hunt at night.
And don't coin hunt, so the bottle cap mode ain't of benefit.
The only potential one that I *might* use that the 70 doesn't have, is the plowed field mode.
Can you run some depth tests using the SAME coil on both the 75 and the 70? If the 70 will get the same depth and is more stable / locks better, than my decision is easy, but want to see someone with both use the SAME coil on each and see (say the 75 coil since you say it's more erratic...let's eliminate the possibility of the coil).
I put the 75 coil on the 70 and ran it for a little bit to see how it done. At least in my dirt here I can tell you that I like the 70 combo with the 75 coil. I like it better than the stock coil on the 70. It doesn't gain it that much depth but it does help it ID things a bit better that it is already detecting.
For example, as I have found with the 75 here...deep bullets will often ID as iron and then bounce into tab/zinc range. With the 70, it is the same way on really deep stuff but with the 75 coil on it, it is able to ID things better to the depth that it can detect. Make any sense?
I actually like the 70's coil on the 75. I think I may just swap the two out and give that a run or two.
For example, as I have found with the 75 here...deep bullets will often ID as iron and then bounce into tab/zinc range. With the 70, it is the same way on really deep stuff but with the 75 coil on it, it is able to ID things better to the depth that it can detect. Make any sense?
I actually like the 70's coil on the 75. I think I may just swap the two out and give that a run or two.