What does it mean when I here people say that the fisher f75 up averagesome.
This is referring to meter readings.
Well, up average using the model you mention here.
Can be driven by soil Minerals.
Depth of target.
Conductivy of target.
Size of target.
Size of coil used depending on depth of target.
Now nonferrous mixed with iron, detector can do both.
Average of multiple nonferrous targets under coil, is different animal really.
Now this average Vdi reported on multiple objects under coil.
This is not true here in the strictest sense.
Why?
Will largely depend on size of target and its conductivity.
For example take a clad dime and a pull tab,,,yep an average will likely happen.
Take a real small pice of foil and a clad dime,,,here dime will rank supreme, and the real small foil is beaten out badly by the detectrors operation.
User here could see actually a true ID of clad dime or very very close to true I.d of clad dime.
Now, there is nonferrous that reads in iron range. Yep it can happen.
The iron actually pulls against the nonferrous signal, this tug of war can put meter reading some times on these targets to like meter readings 6,7,8, ect.
Now, depending on the overbearingness of the iron vs the colocated nonferrous object, the " colocated signal provided could be deeper in the iron range,,hence unless a user digs this deeper Vdi iron range signal, they likely will never know the nonferrous object exists.
One last scenario.
Deeper targets can report as iron with iron meter reading Vdi wise.
Soil mineral levels can accelerate this process making a shallower nonferrous object read as iron sooner.
Some folks, me as well have had some success, watching depth meter using pinpoint.
You might see for example a signal repeating as iron, pinpoint tells you it is 11" deep.
Pinpointing also shows a rounder style target.
So a person can dig these and might find a good find.
Basically in this example, detector is lying to user,,but users can play the odds and expose the detectormformlyint using pinpoint function.
Very possible for a small nuance of audio presentation to give a hint too, like tone that has not totally transitioned to hard iron tone, yet signal not pure like a nonferrous signal generally is.
No matter which detector model one uses. As they grow with their units.
Here is the question folks should be asking themselves.
When you get a less than stellar signal,,,,do you smell a RAT??
When you start out foxing the less textbook signals, and make some better/nice finds then you are getting there with your instrument.
Way too many variables to list.
Only use in varied sites, digging too will expose and help one learn.
Detectors do have tendencies, but tendencies are just that.
Their are exceptions too.
These I call the RATS.
Hunting hard hunted sites, they usually have less textbook signal, more less stellar, it is here where I feel more advanced learning will take place.
Cheers.