below you were reflecting on using your X-Terra 70 with the new DD elliptical coil. In answering questions about your set-up, you replied:
"Sen. 28
Noise cancel auto.
Auto G/B machine. ground Balanced at 82 at this spot. Will auto just as good as manual. Sometimes put it a couple of numbers higher or Positive G/B just depends how bad the ground is and where I am at. This is bad ground as you see at 82 so didnot go anymore pos.
Track off.
Beach off.
Buffs read 12/14 maybe jump to 16 if deep like 8" to 10"s otherwise 12 at 4 to 6"s. Just depends how corroded they are and how bad the ground mineralization is.
Silver war nickles 1942 to 1945 shallow 2 to 4"sread 12, 4 to 6"s 12/14, 8 to 10"s they jump around a little 12/14/16 just depends how corroded they are. Down here they get a little corroded with the salt salinty and sulpher we have in the ground down here. Copper does not do well in places here. Hope you find a bunch as all the old sites I have been hunting have been beat to death and about all there is left is buffs , sheild , v, and war nickles. Which is ok, it helps to dig those targets for button hunting."
I found it interesting, and most of my findings agree with yours as far as the higher TID readings on deeper targets, which is often the rule with virtually all makes and models. However, your description of the GB used and the GB adjustment left me a little confused, to say the least! I usually use the Track function or Auto GB to establish a working setting, then I turn Track 'Off' most of the time, and sometimes I tweak the GB setting by one number.
You stated the following:
"Auto G/B machine. ground Balanced at 82 at this spot. Will auto just as good as manual."... If you get a tracked or auto-adjust GB of #82, I truly envy you That is very low mineralization! If this is over any inland site, an '82' out of a rage of '90' is especially low in ground mineralization, and that can also account for getting better TID's on deeper coins, not to mention just getting better coin audible depths.
"Sometimes put it a couple of numbers highter or Positive G/B..."... There is a misunderstanding about the X-Terra's GB settings and just what is a "Positive" or "Negative" Ground Balance.
With the X-Terra 30 the factory preset GB is similar to a setting of #6 on the X-Terra 50. The X-Terra 50's ground balance in deep woodchip-filled playgrounds around here at maybe 5, 6, or 7, so the X-Terra 30's can work w/o any problem. But in the dirt and on many grassy lawns, the X-Terra 50 requires a setting of 2, 3, or 4 due to the higher mineralization. As you can see, adjusting the GB for a lower (smaller) number reflects a more positive GB adjustment, and using the '+' touch-pad isn't a positive adjustment, but rather a more negative GB adjustment as the numeric setting is increased. The higher (larger) the GB number, the lower the mineralization, nd the lower (smaller) the GB number the higher the ground mineralization is.
Because the X-Terra 70 has a much broader adjustment range we are able to get a more "fine-tuned" GB setting. Because the X-Terra 70 has a GB numeric range from 1-to-90, a setting of '27' would be similar to a factory-set GB of the X-Terra 30. Here, in areas where my X-Terra 50 required a setting of '3' I can use '13' or '14' with the X-Terra 70.
I just finished a multi-state metal detecting (and a little fishing and varmint hunting) vacation from April 19-thru-May 1st and never found a location where I could hunt with my X-Terra 70 that allowed (or established) a GB setting lower than #44 to 47.
"... just depends how bad the ground is and where I am at. This is bad ground as you see at 82 so didnot go anymore pos."... You need to try my 'bad ground' because it is much more mineralized!
On Page 42 of the Operator's manual for the X-T 70 it describes how to obtain a good manual GB. It states you can use the '+' touch-pad to increase the GB setting (the numeric setting) or use the '-' touch-pad to decrease the GB setting (the numeric setting). What isn't explained well is that the '+' and '-' touch-pads increase or decrease the numeric settings, but that is not the same as increasing the Ground Balance to be set more positive or decreasing the Ground Balance to be set more negative. It is just the opposite, and I know for a fact that this has caused many newcomers to using the X-Terra 50 & 70 to become very frustrated with performance. Especially those who manually adjust the GB, and most especially on the X-T 50 because is doesn't fine-tune like the X-T 70.
To INCREASE the GB (not the numeric setting) of the X-Terra 50 or 70, you adjust for the smaller number and this will result is a more positive GB adjustment. To DECREASE the GB setting (or make it a more negative GB, you use the '+' touch-pad and adjust for a larger numeric setting.
For example, if an Auto GB or Tracked GB of the X-T-70 resulted in a setting of #21, and if the operator wanted to manually adjust it just slightly more positive, they would use the '-' touch-pad and adjust for a #20 or no more than a #19.
Just thought I'd comment because I know a reason why many have poor performance and noisy operation afield in some environments with the new X=-Terra's is due to the confusing adjustment requirements of the GB setting.
Happy Hunting,
Monte
"Sen. 28
Noise cancel auto.
Auto G/B machine. ground Balanced at 82 at this spot. Will auto just as good as manual. Sometimes put it a couple of numbers higher or Positive G/B just depends how bad the ground is and where I am at. This is bad ground as you see at 82 so didnot go anymore pos.
Track off.
Beach off.
Buffs read 12/14 maybe jump to 16 if deep like 8" to 10"s otherwise 12 at 4 to 6"s. Just depends how corroded they are and how bad the ground mineralization is.
Silver war nickles 1942 to 1945 shallow 2 to 4"sread 12, 4 to 6"s 12/14, 8 to 10"s they jump around a little 12/14/16 just depends how corroded they are. Down here they get a little corroded with the salt salinty and sulpher we have in the ground down here. Copper does not do well in places here. Hope you find a bunch as all the old sites I have been hunting have been beat to death and about all there is left is buffs , sheild , v, and war nickles. Which is ok, it helps to dig those targets for button hunting."
I found it interesting, and most of my findings agree with yours as far as the higher TID readings on deeper targets, which is often the rule with virtually all makes and models. However, your description of the GB used and the GB adjustment left me a little confused, to say the least! I usually use the Track function or Auto GB to establish a working setting, then I turn Track 'Off' most of the time, and sometimes I tweak the GB setting by one number.
You stated the following:
"Auto G/B machine. ground Balanced at 82 at this spot. Will auto just as good as manual."... If you get a tracked or auto-adjust GB of #82, I truly envy you That is very low mineralization! If this is over any inland site, an '82' out of a rage of '90' is especially low in ground mineralization, and that can also account for getting better TID's on deeper coins, not to mention just getting better coin audible depths.
"Sometimes put it a couple of numbers highter or Positive G/B..."... There is a misunderstanding about the X-Terra's GB settings and just what is a "Positive" or "Negative" Ground Balance.
With the X-Terra 30 the factory preset GB is similar to a setting of #6 on the X-Terra 50. The X-Terra 50's ground balance in deep woodchip-filled playgrounds around here at maybe 5, 6, or 7, so the X-Terra 30's can work w/o any problem. But in the dirt and on many grassy lawns, the X-Terra 50 requires a setting of 2, 3, or 4 due to the higher mineralization. As you can see, adjusting the GB for a lower (smaller) number reflects a more positive GB adjustment, and using the '+' touch-pad isn't a positive adjustment, but rather a more negative GB adjustment as the numeric setting is increased. The higher (larger) the GB number, the lower the mineralization, nd the lower (smaller) the GB number the higher the ground mineralization is.
Because the X-Terra 70 has a much broader adjustment range we are able to get a more "fine-tuned" GB setting. Because the X-Terra 70 has a GB numeric range from 1-to-90, a setting of '27' would be similar to a factory-set GB of the X-Terra 30. Here, in areas where my X-Terra 50 required a setting of '3' I can use '13' or '14' with the X-Terra 70.
I just finished a multi-state metal detecting (and a little fishing and varmint hunting) vacation from April 19-thru-May 1st and never found a location where I could hunt with my X-Terra 70 that allowed (or established) a GB setting lower than #44 to 47.
"... just depends how bad the ground is and where I am at. This is bad ground as you see at 82 so didnot go anymore pos."... You need to try my 'bad ground' because it is much more mineralized!
On Page 42 of the Operator's manual for the X-T 70 it describes how to obtain a good manual GB. It states you can use the '+' touch-pad to increase the GB setting (the numeric setting) or use the '-' touch-pad to decrease the GB setting (the numeric setting). What isn't explained well is that the '+' and '-' touch-pads increase or decrease the numeric settings, but that is not the same as increasing the Ground Balance to be set more positive or decreasing the Ground Balance to be set more negative. It is just the opposite, and I know for a fact that this has caused many newcomers to using the X-Terra 50 & 70 to become very frustrated with performance. Especially those who manually adjust the GB, and most especially on the X-T 50 because is doesn't fine-tune like the X-T 70.
To INCREASE the GB (not the numeric setting) of the X-Terra 50 or 70, you adjust for the smaller number and this will result is a more positive GB adjustment. To DECREASE the GB setting (or make it a more negative GB, you use the '+' touch-pad and adjust for a larger numeric setting.
For example, if an Auto GB or Tracked GB of the X-T-70 resulted in a setting of #21, and if the operator wanted to manually adjust it just slightly more positive, they would use the '-' touch-pad and adjust for a #20 or no more than a #19.
Just thought I'd comment because I know a reason why many have poor performance and noisy operation afield in some environments with the new X=-Terra's is due to the confusing adjustment requirements of the GB setting.
Happy Hunting,
Monte
The preset machines work well here. If we take Monte results as fact also, then the actual number you balance out at is apparently meaningless!!!! Just like with the CZ's, I feel what is more of an indication as to the amount or iron mineralization can be seen in how touchy the adjustment is. If it takes large number changes to hear a difference when GB'ing you got some good (mild) ground. If one or 2 numbers change the audio response drastically,,,I feel sorry for ya. 
. Getting old or too many detectors. The audio of the threshold at all these places is a low tone. If I was in manual and I adjusted the numbers down with the - button the tone just stayed low and never went to a higher tone. If I I pushed the + button the tone of the audio did go up. Now all I am trying to do is get the machine a little more positive so it will even be more sensitive to the gold buy increasing the threshold tone in G/B. Now on the DFX you Auto G/B the machine and put a +2 in the machine or increase to a positive G/B by a +2. On the Fishers you G/B to a 0 or stable threshold no increase or decrease in the threshold then just give it a little louder threshold all this does is quites the noise of the machine down a little and lets you hear the smaller gold. 
this is making me 
. I must be trying to make the X70 work like my Shadow and my Fishers cause now I am really confused. My CZ70 is a digital, my CZ 6A, CZ20,and CZ3D are analog like Tom says. The only thing I do different is I just have to go in different directions on the G/B knob. You can even put a little Pos or a increase in the Threshold on my MXT. Now maybe I got the wrong idea on making a machine a little more quiter so you can hear the gold a little better by increasing the threshold a litte in G/B. So if I have been wrong for 20 years and that is sure possible you know how us old guys are when we get something in there head 
. Now don't everybody 
me up just be gental to this old guy. After all it is hard trying to keep 13 machines and how they work stright don't you know now. 
. Later Jerry aka Tinfoil
. I am even getting to like it better then my Exp ll and that is saying a lot. I don't have anything to say neg about any of you guys that have spent alot of time evaluating the machines. I know how hard it is and I for one really appreciate everyones help. Like you, I have been doing this for 20 years and have been Thur a few machines. I have just never posted very much in the past as I was always working and hunting every chance I got when I have the time. Now that I am retired I can post more hunt more, show more of my ignorance 
and really enjoy the things I love doing most and that is metal detecting. Every machine has it little quirks like this one has. We just have to work with, share all we can find out about the machines, get everything going the right way by getting inputs from all involved That will help myself and all these owners that have them. I saw a old man today that was pushing one of those walkers and I was thinking of how to fix it up so I could metal detect with it, if I ever get that bad where I have to have one. 