Can Some Explain the Difference Between

[murfar1]

the terms automatic ground balance/fixed ground balance? One in the same? Does that mean auto ground tracking? Trying to figure out what the Scorpion is doing. Here's a quote I recently read -- "ALL current Brand-name detectors have "autotrak" inherent in their circuitry. Without it none of the detectors would ever stay ground balanced at all, even the manual ones. The automatic ground balance is always running and always there, and is found in all detectors -- ALL metal detectors currently made have "autotrak" AKA "fast retune or return to automatic ground balance" -- Thanks

 

[Fishers Ghost]

Ground tracking/Balancing and Auto retune are two completly different things.

All detectors do not have Auto ground Balance.

In Auto ground balance the detector continualy monitors the ground mineralisation and adjusts the electronics such that the mineralisation has no effect on the threshold tone and the detector will continue to detect to its max depth Therefore if you were to raise or lower the coil the threshold would not alter or alter very little when auto GT is operating correctly.

In Auto Retune the threshold tone is continually reset to your preset level. Therefore when the mineralisation changes so that it either causes the threshold to go up or down then the auto tune resets it to your level but if you were to lower or raise the coil the threshold would change and then retune again or you would manually adjust it. Auto Retune does not cancell out the effects of mineralisation and even though in say, fast Retune (SAT) the threshold may remain fairly steady but depth would still be lost when mineralisation is high because in auto retune the ground mineralisation is not canceled out.

Many VLF detectors have a preset amount of ground Balance built into the ccts in the disc mode and will therefore operate quite well in ground mineralisation within the range of the preset fixed GB These machines often have a manual or Auto GB All Metal Mode and some will have a non GB TR Mode that has Auto/ manual or Push button Threshold Retune. The TR mode is ok in non mineralised ground.

Detectors with preset fixed GB often have a silent threshold and also a very fast Auto retune and this allows these machines to run quiet over high mineralisation because all of the ground noise due to the mineralisation is rapidly retuned below audible threshold levels and this results in the detector not having good detection depth capability compared to a machine with good ground tracking adjustments. These detectors also have extreme sensitivity which causes them to give solid hits on small or large targets which makes it difficult to guestimate the target depth or size.