High and low tones on same coins ?

[Digger 45]

With the Xterra 705 i sometimes get a high or a low tone, lets say a nickel is discovered reading 10-12 using the 10 x 5 coil sensitivity at 18-20 at one time it will sound out at a low to med tone and then another target with a nickel will read the same but sound out at a high tone like a dime, after extracting each target there are no other masked targets in the ground. Both nickels are laying flat not on edge. The only thing i can think of is maybe the ground balance is difference in the two locations and that may make a difference.

Also using 99 tones while detecting. It is more likely with nickels than any other coins, dimes and quarters always ring true high tones and pennies are true, clad at 30-32 and copper at 38.

Not a problem just wondering if there are other ideas out there as to why this happens.

 

[pescadore]

I have never dug a nickel from a high tone with an Xterra before. Not saying it can't happen but I wouldn't be able to help. I do however wish we could set up tones for certain VDI's like some other detectors allow. When using detectors that allowed it, I always set the nickel range to a high tone.

 

[kevmar]

Depth can and usually will influence the range of tones produced by a similar target,
if I were you i'd give 2 tones a try,
I have found hundreds of nice things using only 2 tones,
and I only got the 705 around February time.

 

[Mark in S.E. IA]

I have found old Buff's or V's that have come in as a dime and even a quarter. The only times I have had that happen is when the soil was really hot with GB numbers below ten and I was getting a lot of high tone chatter from the soil. You'll run in to a lot of weird things while MDing that you just can not explain, it just happens.

 

[Digdoggy]

Do you have TID stability on. Its the plus sign on your screen. You may even held the mode button too long not realizing it which turns this feature on. It can give the wrong audio response for a given TID and even warns this in the manual. It does just what your explaining. Just trying to help but you prob already checked that feature.
If its not that there may have been ferrous metalic molecules around that nickle that read lower than norm. Like a pipe that was removed from that spot at one time. The hole may read clean because you removed the little area of metalic molecule and mixed it up. HH GL..

 

[Digger 45]

Yes the TID is on but thanks anyway, i do have extremely hot soil and some times my ground balance is running in the single digits, i run tracking all the time just for that reason. Yesterday i pulled a nickel at the usual 10-12 with an extremely high sound it was a 1975 and then just the next coin read a 10-12 with a med tone and it was a 1983 nickel on the ground they both sounded the same, so i think you may be right there is some masking metal small enough to change the sound but not the digital read out. Kind of interesting anyway.

Thanks for your help, good luck hunting.