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newbie question about nulling out?:confused:
- Thread starter Joe19403
- Start date
This is a good question that will get a "mulit-sided" answer. In short I believe you can miss good targets. How?
1. Depends on where your discrimination is set at....how low your Fe goes down to.
2. Depends on swing speed. Slower is better, but TOO slow can be deterimental depending on where your sensitivity is set at.
3. Depends on "angle" of approach. Some coins are so masked or on edge that only the right angle will give you a hint that something is down there.
My conclusion, and this is how I hunt (not necessarily the right way)...
I don't worry about it. I have my discrim. open down to the 27th line, so I'm not worried about missing stuff. Its more about putting up with the falsing and such.
When hunting in Conductive tones and with a discrimination pattern, if you are "nulling" out more than you like due to iron, than it is probably a good idea to switch to a fairly wide open screen and go to the Two Tone Ferrous (TTF). This will increase you "productive" time while making "non-ferrous" targets stand out.
In a nutshell, the E-Trac is good at getting the good tones out of a null.
NebTrac
1. Depends on where your discrimination is set at....how low your Fe goes down to.
2. Depends on swing speed. Slower is better, but TOO slow can be deterimental depending on where your sensitivity is set at.
3. Depends on "angle" of approach. Some coins are so masked or on edge that only the right angle will give you a hint that something is down there.
My conclusion, and this is how I hunt (not necessarily the right way)...
I don't worry about it. I have my discrim. open down to the 27th line, so I'm not worried about missing stuff. Its more about putting up with the falsing and such.
When hunting in Conductive tones and with a discrimination pattern, if you are "nulling" out more than you like due to iron, than it is probably a good idea to switch to a fairly wide open screen and go to the Two Tone Ferrous (TTF). This will increase you "productive" time while making "non-ferrous" targets stand out.
In a nutshell, the E-Trac is good at getting the good tones out of a null.
NebTrac
Should null on any target disc'd out, providing the target's numbers fall under the "disc'd" out region. I'll give you an example.
On the E-Trac rusted bottle caps (these are the ones used back in the 20's - 50's and such. There must be something on the inside of them that will cause them to "act" like a nickel. There are time when you hit them and they just call out "nickel" 12-13 or 12-14. Even at depth. But as you start to circle all of sudden things change.
As you circle the Fe will stop to raise, you see a 17, then a 22, then 26, while the Co. stays dead on 13 or 14. As you continue to circle all of sudden they'll null out. So you hit QuickMask and your Fe. number has jumped to 01. Dead give away for an old pop top.
In a nutshell here, I usually dig 'em and get rid of the signal at the old spot I hunt at, now at parks I generally let them stay in the ground to confound other detectorists...but I usually dig a few to "confirm" what I thought my machine was telling me.
NebTrac
On the E-Trac rusted bottle caps (these are the ones used back in the 20's - 50's and such. There must be something on the inside of them that will cause them to "act" like a nickel. There are time when you hit them and they just call out "nickel" 12-13 or 12-14. Even at depth. But as you start to circle all of sudden things change.
As you circle the Fe will stop to raise, you see a 17, then a 22, then 26, while the Co. stays dead on 13 or 14. As you continue to circle all of sudden they'll null out. So you hit QuickMask and your Fe. number has jumped to 01. Dead give away for an old pop top.
In a nutshell here, I usually dig 'em and get rid of the signal at the old spot I hunt at, now at parks I generally let them stay in the ground to confound other detectorists...but I usually dig a few to "confirm" what I thought my machine was telling me.
NebTrac
I have had my threshold null out even in a wide open screen with no discrimination, running auto +3 sen, in TTF. It happens in places where there is nothing more than a thin layer of poor soil covering old rocks-really old rocks. My guess is that this is caused by the conductive properties of hot rocks. 75% of my tones are high, but numbers are mostly in the bottom right with lots of bleed through to 1-30 to 1-36. the remainder are low tones. I have a difficult time trusting any of the signals; tones or numbers. Its very difficult to get the CO number to stick in a general column with so much old rock about.
I know there is good stuff in this place, I've dug it out, but back to the original question, has anyone else experiences a nulling in a wide open screen?
I know there is good stuff in this place, I've dug it out, but back to the original question, has anyone else experiences a nulling in a wide open screen?
If you have your ground set to difficult, and your trash level set to hi, your machine should still give you a signal on any target that you do not have discriminated out. Keep in mind that the presence of iron, or other disc'd out targets will have an effect on the accuracy of the audio and ID numbers displayed on the screen. A smaller coil can in some cases make a huge difference in what you see and hear.