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Ground balance offset ?
- Thread starter SWMO Mark
- Start date
BarnacleBill
New member
Not unless the GB varies as you move along. i.e. If most of the time it tracks at 10 then quickly changes to 20 because of streaks, then an offset of +5 would mean tracking at 15. Therefore splitting the difference. If it's consistent around one number, then no.
Also you need to try to offset manually first to see if the soil is so hot you can't offset it.
HH
BarnacleBill
Also you need to try to offset manually first to see if the soil is so hot you can't offset it.
HH
BarnacleBill
BarnacleBill
New member
I'll try to clarify.
The X705 now comes with a GB Offset capability for use in the Ground Tracking Mode. The adjustment range extends from minus(-) 15 to plus(+) 15 with 0(zero) being the center point of no Offset applied.
A. Let's take an example of a 100ft x 100ft patch of ground. If I walk to each of the four corners and ground balance, and find that the GB number is always 12. Then if I wander around a little and take some more random readings and they come up 12. In this case I don't need to use Tracking because the ground doesn't vary, I can just set it at 12 and off I go.
B. Same scenario but at the four corners I get 7,12, 18, 22. I then wander around a little and find pretty much readings in the same range and notice the changes in the soil make-up are gradual from one place to another. In this case I would turn Tracking ON and let the detector do the work for me while I concentrate on hunting.
C. Same scenario as "B". But this time I notice that the ground has narrow streaks of mineralization with rapid changes of the numbers within a distance of a foot or so. So I turn Tracking ON but notice that when I go from an area reading a 7 to a 22 that the Tracking doesn't react quick enough and I get some chattering. On the X705 the Tracking Offset is a tool to help with that issue. So to use the tool a little math is in order. The lowest number I am Tracking at is 7 & the highest 22. 22-7=15 therefore I have a 15 point spread on my hands. Take 15/2=we'll call it 8. So I go into the GB function screen, click on Accept/Rej and use the +- buttons to apply a +8 offset while Tracking. Now when the computer Tracks at 7, I've told it to apply a 15 GB point which is 8 points higher. So now this applies a buffer time on rapid ground changes since the detector will not react instantly during Tracking. Yes if I stay over areas that are 22 for a while then I'll be Tracking up at 30. If that starts to become an issue then I can reduce the offset.
It's just another tool to be used that can be helpful. If it allows the detector to be run at higher sensitivity levels without becoming chatty, then greater depth can be obtained.
As far as a manual offset which any of the new Terras can do, it's pretty much the same as it's always been. You can apply a positive or negative GB point depending on how you think it might help your situation. Personally whenever I am trying to push the detector to the sensitivity limit and am fooling with the GB, I always bobb the coil up and down in Coins All Metal mode to see if it sputters. Then I'll kick the sensitivity up a couple points and swing the coil left/right to see if I can live with it.
HH
BarnacleBill
The X705 now comes with a GB Offset capability for use in the Ground Tracking Mode. The adjustment range extends from minus(-) 15 to plus(+) 15 with 0(zero) being the center point of no Offset applied.
A. Let's take an example of a 100ft x 100ft patch of ground. If I walk to each of the four corners and ground balance, and find that the GB number is always 12. Then if I wander around a little and take some more random readings and they come up 12. In this case I don't need to use Tracking because the ground doesn't vary, I can just set it at 12 and off I go.
B. Same scenario but at the four corners I get 7,12, 18, 22. I then wander around a little and find pretty much readings in the same range and notice the changes in the soil make-up are gradual from one place to another. In this case I would turn Tracking ON and let the detector do the work for me while I concentrate on hunting.
C. Same scenario as "B". But this time I notice that the ground has narrow streaks of mineralization with rapid changes of the numbers within a distance of a foot or so. So I turn Tracking ON but notice that when I go from an area reading a 7 to a 22 that the Tracking doesn't react quick enough and I get some chattering. On the X705 the Tracking Offset is a tool to help with that issue. So to use the tool a little math is in order. The lowest number I am Tracking at is 7 & the highest 22. 22-7=15 therefore I have a 15 point spread on my hands. Take 15/2=we'll call it 8. So I go into the GB function screen, click on Accept/Rej and use the +- buttons to apply a +8 offset while Tracking. Now when the computer Tracks at 7, I've told it to apply a 15 GB point which is 8 points higher. So now this applies a buffer time on rapid ground changes since the detector will not react instantly during Tracking. Yes if I stay over areas that are 22 for a while then I'll be Tracking up at 30. If that starts to become an issue then I can reduce the offset.
It's just another tool to be used that can be helpful. If it allows the detector to be run at higher sensitivity levels without becoming chatty, then greater depth can be obtained.
As far as a manual offset which any of the new Terras can do, it's pretty much the same as it's always been. You can apply a positive or negative GB point depending on how you think it might help your situation. Personally whenever I am trying to push the detector to the sensitivity limit and am fooling with the GB, I always bobb the coil up and down in Coins All Metal mode to see if it sputters. Then I'll kick the sensitivity up a couple points and swing the coil left/right to see if I can live with it.
HH
BarnacleBill
But I like to run my GB a bit positive.....To do that on the X-70, I set my GB automatically, check it manually, and then drop the setting by 3 or 4 numbers. In my mind, I am fooling the detector into believing that the ground is a bit more mineralized than the electronics indicated. That may produce more chatter than some would like. And, I have to check and reset it as I wander across the fields, to keep it set where I want it. But if I used the standard tracking mode, it would provide the "actual" GB setting the software thought I needed, and ignore that "positive" influence I like.
Enter Tracking Ground Balance Offset.
I took my 705 out for it's maiden voyage today. This event took place at the site of an old "driving park", circa 1894. During the past 115 years the railroad was removed, the river was straightened and clips the west end of the track. And the E/W gravel road was relocated. Anyway, the site is now just a corn field.
As I entered the field I set my 705 to All Metal mode, set the NC automatically, confirmed my Volume was at 30, my Threshold was set to 4 and my Sensitivity was set to 20. I Auto GB and the 705 told me it was a 38. I checked it manually and confirmed it at 38. I then raised my Sensitivity to 27 and set my Tracking Bround balance Offset at -4. This now gave me a "compensated" GB setting of 34. (38 + -4 = 34) As I tracked across the field, the GB setting changed as necessary, just as it does with my X-70 in "normal" tracking. But now, Tracking GB Offset helps me "fool" the 705 into believing the "proper" GB setting should be 4 digits lower than it would have normally set it (with regular tracking). This gives me a continuous "positive" GB setting of -4 , instead of having to constantly check and reset it manually. At least that is what I think it does!!!
I'd like to be able to report that I found a handful of silver coins. But I didn't. My brother and I walked around there for several hours and got zip. Nada! Oh, I did manage to pull a Buffalo nickel out of another field that was the site of an old church. But other than that, it was just a great day to be outside and spend time with my brother! HH Randy
Enter Tracking Ground Balance Offset.
I took my 705 out for it's maiden voyage today. This event took place at the site of an old "driving park", circa 1894. During the past 115 years the railroad was removed, the river was straightened and clips the west end of the track. And the E/W gravel road was relocated. Anyway, the site is now just a corn field.
As I entered the field I set my 705 to All Metal mode, set the NC automatically, confirmed my Volume was at 30, my Threshold was set to 4 and my Sensitivity was set to 20. I Auto GB and the 705 told me it was a 38. I checked it manually and confirmed it at 38. I then raised my Sensitivity to 27 and set my Tracking Bround balance Offset at -4. This now gave me a "compensated" GB setting of 34. (38 + -4 = 34) As I tracked across the field, the GB setting changed as necessary, just as it does with my X-70 in "normal" tracking. But now, Tracking GB Offset helps me "fool" the 705 into believing the "proper" GB setting should be 4 digits lower than it would have normally set it (with regular tracking). This gives me a continuous "positive" GB setting of -4 , instead of having to constantly check and reset it manually. At least that is what I think it does!!!
I'd like to be able to report that I found a handful of silver coins. But I didn't. My brother and I walked around there for several hours and got zip. Nada! Oh, I did manage to pull a Buffalo nickel out of another field that was the site of an old church. But other than that, it was just a great day to be outside and spend time with my brother! HH Randy
Jackpine Savage
Active member
What in the world are you talking about Bill? Buffer time? reaction time? Heck just use what we did on the 70 and turn tracking off/back on again if it ain't a keeping up with changing ground.
Ima gonna start callin you the weatherman... is that cloudy or partially sunny?
Plain and simple. GB offset has historically been used to increase sensitivity to certain targets. a little negative under some conditions will increase sens a bit to high conductors or a little positive to increase sens to small low conductors. At times offsetting the GB can help with iron. It can't always be relied on to gain the effect you want depending on ground conditions so no one can tell some one else how it may or may not work in their ground.
Now, since ML has deemed it a useful feature to add to the 705 it should be explained clearly in the manual that it is an advanced tool for experienced users.
Until some experienced iron hunters and some one with mild ground that hunts silver gets some time on the new 705 trying various offsets it can't be said how effective a tool it is.
Oh yeah, setting the offset to a negative number to get a positive response as Digger stated below due to Minelabs reverse scaling will always remain counter-intuitive to us less sophisticated users. Please ML just let me hear the ground response not some dang tones!!!!
Tom
Ima gonna start callin you the weatherman... is that cloudy or partially sunny?
Plain and simple. GB offset has historically been used to increase sensitivity to certain targets. a little negative under some conditions will increase sens a bit to high conductors or a little positive to increase sens to small low conductors. At times offsetting the GB can help with iron. It can't always be relied on to gain the effect you want depending on ground conditions so no one can tell some one else how it may or may not work in their ground.
Now, since ML has deemed it a useful feature to add to the 705 it should be explained clearly in the manual that it is an advanced tool for experienced users.
Until some experienced iron hunters and some one with mild ground that hunts silver gets some time on the new 705 trying various offsets it can't be said how effective a tool it is.
Oh yeah, setting the offset to a negative number to get a positive response as Digger stated below due to Minelabs reverse scaling will always remain counter-intuitive to us less sophisticated users. Please ML just let me hear the ground response not some dang tones!!!!
Tom