Multi turn potentiometer

[Mark-VA]

Would a multi turn potentiometer on the TDI allow for more GB range adjustment?
Mine has a 3/4 turn and at times a true GB is difficult to achieve and then it changes quickly.

[ivconic]

Multiturn will only allow you to make a more precise and stable setting, but in the same range.

[Carl-NC]

Correct, multi-turn will not change the range but will make it easier to hit the right spot.

[Mark-VA]

Okay, I guess I need to confess, I have more than one reason for wanting to change the GB controller or why I wanted dual GB controls. As you all may know targets can be balanced out so they are silent or close to silent when passing by the coil. A 1906 $5 gold coin will balance out about 9 1/2, not that I want to balance out this particular coin but I'm just saying. Many nails will balance out at around 4-5 which does give me some degree of so called discrimination (just a word). Interesting how this happens but since I don't hunt gold nuggets (because in my are they are all but non existent) I'm a gold ring hunter. On a VLF detector I never pass up a nickel signal because many of my found rings read nickel or just below. The TDI allows me to hunt areas (extreme ground combined with coke) where no other detector I have allows with any success. I was hoping the Tarsacci was the detector but EMI crippled the detector in my areas. My main less desirable are pieces of aluminum cans, can pull tabs and the old beer pull tabs.
While re-reading all my PI information I came across a post by Reg when the TDI first came out about how the machine could balance out many undesired targets using the GB control. Here is a quote from this particular article by Reg, Quote: "Keep in mind this GB procedure and how it works because it is very important. Why? Simple, as far as the PI is concerned , the ground signal is simply another object's signal and other objects act much like the ground. In other words, if the GB control was infinite, then all objects would have a setting on the GB control where they balance out, meaning the signal from that object is minimal."

Now you may know where I'm going!

[Carl-NC]

You can do this, but gold rings fall all over the range and so does trash, so the minute you null out a piece of trash you are also nulling a gold ring. The same is true with VLF discrimination (or target ID). If you want gold rings you simply have to dig everything.

[Mark-VA]

As always a word of wisdom. Thanks
That is why I always dig nickel signals. Only found 1 ring that read above a nickel all the rest range mostly in the foil area.
Guess I'll just set the GB and flip the switch to low and continue to hunt. According to Reg a true mono coil will give more audio clues to nails than the other type coils.