is there a technique for setting notch width

[calebsone]

is there a technique for setting notch width with a on the board trimmer. what i mean is like ground balance using ferrite and silver. is there a way of knowing if you set the notch width to the optimal setting.

[calebsone]

so no one has any methods to know if you have full range of use for notch

[kt315]

full range you mean of a foil of -
1/ small size
2/ middle
3/ big
4/ pull tab

is it good or not? or you mean something another?

[Carl-NC]

There's not an optimal setting for notch width, it's just a discrimination method. You can set it narrow or wide, depending on how much you want to discriminate. As an example, Tesoro sometimes has variable notch width.

[Silver Dollar]

Not many people using notch. The Golden saber project morfed into TGSL with the notch removed.
The problem is you can eliminate good targets. Most people just use discriminate and try to eliminate
iron and maybe foil from time to time.

[Qiaozhi]

The notch feature is only really useful in one particular case; and that's when you're looking for a lost item, and you don't want to spend time digging unnecessary targets. If you have an identical item, you can use it to notch out everything else in an air test. Otherwise, as Silver Dollar said, experienced detectorists only knock out iron, and occasionally foil.

[Carl-NC]

Notch can be useful in certain situations. I once hunted a spot that had a severe abundance of a particular pull tab, and another spot that had a lot of .22 casings. I could also see using it to knock out zinc pennies.

[kt315]

which notch and where? in King Cobra the notch does not knock out the metal. it changes only sound, from hight pitch to low if there is a foil or ferrous.
a notch in ML GT or Elite, for example, works in another fashion, like Carl wrote.

[Merc]

Actually the King Cobra should go silent on objects within the notch in notch Reject mode. The notch width is adjustable internally. Objects above the notch give a high tone, objects below the notch give a low tone. If you turn the notch off, you still get two-tone audio above and below the notch setting with zero notch width.

Merc

[calebsone]

i am talking about the king cobra i just figured its notch was similar to the golden saber so i thought there was a methods to its set up like ground balance but i think i see what you all mean. i was thinking if to wide you would lose targets like silver and to narrow it would be to like detecting something even if there was no targets maybe. guess i thought wrong thanks everyone for the help.i have noticed the notch isn't the necessary.again thanks everyone. kt i did mean just that but i think i know how to set it up now.

[kt315]

notch width is some kinda a sector on one phase scale of the discrimination. it lows the sound pitch on unwanted metal targets. that wrote Merc is wrong, there is no silent, this is not modern technology more advanced that really silent, that is old analog tech. set the pot in middle position, go trip, then 45 grad at left from the middle, go trip, then 45 at right, etc... it is fully intuitive tuning, you have to be observe reaction at a foil, pul tab etc. - those have to give low tone or edge of low-to-high-to-low.

[Merc]

Perhaps there is a misunderstanding. I made a video to demonstrate.

Merc
https://www.youtube.com/watch?v=W-nM...OFp4LNl5zWTi6A

[calebsone]

merc thanks its good to see what it should be doing and at what setting. kt i see what your saying on how to set the width i just have to try different placements of the trimmer till i get the best one at high and low notch on the out side pot right?

[kt315]

Merc, if you are now so activizated up in forum... I ask you to help and give me a data on additional components above IC soldered at right corner of pic. this is pic of GMT1650 you shared.
I see resistors 100K, maybe... caps 50pF, maybe, and points of the soldering.
you video is good. thanks.

[scrungy_doolittle]

multiple notches would be useful. You could set them to accept or reject. Accept if target falls within a notch, or multiple notches. I wish the VDI had it, so you could say accept anthing with a phase angle
of reject anything from 1 to 40 accept 40 to 50 report as zinc reject 50-60 and so on.