F75 vdi's

[jas415]

I got the new LTD Se about 2 months ago and have done ok with it, but I am having either learning issues or settings issues. I start with sense at about 75-80, disc at 15, 4 tones, de mode, and small coil. To me it says every 68-75 signal is a dime. When I look at the little boxes above the numbers, the dime box is filled in and the numbers can be anywhere from 68-75. The confidence do dad seems to be 'positive' it is a dime if right over the target on pin point and quite often it is a penny. Clad quarters also are anywhere from 73-80 and they are most often identified as a dime. So what I am asking is; Does this machine have any degree of accuracy as to target ID other than a rough estimate? I have done air test after air test and it is stable as can be but the ID's are quite often wrong. Some wheats are coming up as 74-75, then others are 69-72, zincs can be down in the 50's to upper 60's, and the tones being as they are limited to 4, seem to be stable. I have found a lot of good stuf with it but the target ID to me is an issue. I got this F75 as a 'different' backup machine to my CTX, which is exceptionally accurate on target ID, and maybe I am just too used to the CTX, So, can someone steer me toward a set of VDI numbers that are accurate or is it more like a ballpark identification with the F75.

 

[Elton]

Make certain your hitting the middle of the coil as you swing.and are there any other items in the hole or near your pinpoint area..

 

[Coin Rescue Inc]

For me clad dimes and copper pennies ring up the same. They are about the same size and the clad dimes are 90 percent copper. So the dime label might mean clad dime-penny
My clad quarters ring in a bit higher like up to 80 to 88. zincolns are low like yours.

Now any iron near a coin can lower the numbers and make the Identification number read low.

How bad is your dirt.

I experimented with a clad quarter and an 1-1/4" solid iron nail. And placed them side by side. The numbers de come bouncy and ring up like tabs in the 50's.

Keep in mind there are two separate processes going on.
Audio and visual ID numbers.

The Audio is always more reliable. So if you set up in multiple tones always investigate the higher tone. It might be a masked target. If a coin is real deep you might get the audio but no ID number.

In Nov I had a higher target In the low 80's and s grunt for iron.
I dug the plug and pin pointed the hole and found an old rusty nail.

 

[Charlie P. (NY)]

Here's a list I made for my F75. Haven't had a chance to see if the upgrade is consistent. And remember - these aren't gospel. Depth, orientation (flat, on edge, etc), condition, all may put a little variation on the relative conductivity.

 

[mudpuppy]

I guess I'd drop sens to 50 and try DP tones..just as a test....you should easily get tighter readings than you are, not all over the place in that wide a spectrum...generally only a few integers if any...what you are experiencing is way too wide.....so drop into DP to see if theres a tone difference between a Q and a D just as a reference point...

The copper pennies and dimes..they are so close both in tone and TID...73-75....with a lower sens, a guy can sort of get an idea based upon the 'size' of the tone, crispness and volume...but that takes a huge amount of practice, so for all reasonable purposes, the older copper pennys and D's sound and TID the same, I can pick dimes, but its taken me 4 straight years of running the same settings to hear the subtle difference...I can easily tell a canadian penny from a dime though, just by the higher ping and higher TID 78...The Q should be unmistakable mid 80's and a Half should be a solid 92....
Mud

 

[Steve O]

Yea Jas, going from the CTX ID to the 75 may get you frustrated. The minelab's ID is probably the best going. The 75 is more sensetive and therefore a bit jumpy. Stay with it though.....it is a great detector when working properly. Keep your GB spot on too.

 

[Coin Rescue Inc]

For me clad dimes and copper pennies ring up the same. They are about the same size and the clad dimes are 90 percent copper. So the dime label might mean clad dime-penny
My clad quarters ring in a bit higher like up to 80 to 88. zincolns are low like yours.

Now any iron near a coin can lower the numbers and make the Identification number read low.

How bad is your dirt.

I experimented with a clad quarter and an 1-1/4" solid iron nail. And placed them side by side. The numbers de come bouncy and ring up like tabs in the 50's.

Keep in mind there are two separate processes going on.
Audio and visual ID numbers.

The Audio is always more reliable. So if you set up in multiple tones always investigate the higher tone. It might be a masked target. If a coin is real deep you might get the audio but no ID number.

In Nov I had a higher target In the low 80's and s grunt for iron.
I dug the plug and pin pointed the hole and found an old rusty nail.

(TEXT was cut off?) I rechecked the area with the F75 and the high tone was in the plug. It was a silver quarter. Just an example of an ID number and tone that vary due to masking.