Before and after upgrade F75

[WV62]

I noticed a difference when doing a ground balance from before and then after upgrade. After upgrade I took it to one of the areas I hunt a lot just for a test run. Right off I noticed that when trying to find a clean spot with the trigger PP mode that I was now getting a pretty loud tone all the time where before I could get it to go quit over a clean spot and then do the GB. I wondered around there for several minutes and I noticed that over the loud tone I could hear some trash targets so I just did the GB off to the side away from the trash and I was able to get GB numbers about the same as before upgrade.

Anybody else noticed this problem?

Ron in WV

 

[Coin Rescue Inc]

If I remember correctly the default ground balance before the upgrade was 60?
Now it is 80. At 80 I have a difficult time ground balancing especially indoors in there is EMI. It is like trying to ground balance over metal.
When you get that sound you describe, I wonder what your Fe meter reads. Maybe the sound is EMI. The meter would confirm that theory.

 

[MarkCZ]

Big Brother, didn't I read in one of the topics that the upgrade changed the default ground balance setting? if so that may be the reason.
It sounds like when your turning on the detector and getting setup that the default GB setting is at a point that the detector has a "Positive" reaction to the ground in the pinpoint all-metal mode.

Mark

 

[MarkCZ]

If I remember correctly the default ground balance before the upgrade was 60?
Now it is 80. At 80 I have a difficult time ground balancing especially indoors in there is EMI. It is like trying to ground balance over metal.
When you get that sound you describe, I wonder what your Fe meter reads. Maybe the sound is EMI. The meter would confirm that theory.

"CR" I guess we were working on our replies at the same time because when I started my post Ron's was the only one here. LoL!

Mark

 

[WV62]

You know that would explain it, I just never thought about the new default GB setting. I have the old manual and took a look through it to see what old GB default was, couldn't find it, can't remember but that 60 sounds right.

When I get back and have a little more time I will go through the manual again.

Thanks for the quick answer,

Ron in WV

 

[Charlie P. (NY)]

As I recall it was 60.

 

[MarkCZ]

This is the only thing I found doing a quick look through the manual, it does refer to "60" but here its about sensitivity and NOT GB. I'm still looking for the default GB number.
Added some more screen shots

The term is "Ground Pickup"

The Preset GB level of the F75 is supposed to go positive.

But I still didn't see what the default GB value is?

Mark

 

[mudpuppy]

Enough of this technical blather!
Will one of you Poindexters please get out of the house and go find some metal to post a hunt about? I'm dying here! Anything! Even zincs will do...Forget about the 'air tests and GB' and go swing some over dirt please! .
Mud

 

[Coin Rescue Inc]

It was 16 degrees this morning and 10" of snow tonight. Well that is the prediction.
thought about metal detecting the snow banks where the plows push the snow when cleaning the parking lots.

instead I went out and metal detected in a local pawn shop and found this.

 

[Lakota]

Mud is that your snow ??? lol

Ok I'll help you out but it will be over in the Tesoro forum, Cutlass is keeping the streak alive.

And yeah the old default was 60 which is pretty close to where my ground is in a number of locations... wonder why the increase to 80... That is how the Omega is set up, at preset 80 GB.

Wont be able to comment on how this will effect me with the 75, but I never had any trouble GB'n the Omega.

Muds right though... Brave the cold and get that early year lo0t boys

Lakota

 

[WV62]

So my ground in that location ground balances about 68 and with a starting GB of 60 before up grade lower than my ground and 80 now above my ground does explain my problem. I should have thought of that but with all the other problems being talked about I think I was just locked up on broken detector.

I have only been hunting with the F75 since 2010 so I am kind new at it.LOL

Thanks for the help,

Ron in WV

 

[Coin Rescue Inc]

So does ground balance settings above or below the actual ground balance number affect air test results?

 

[2 Much Trash]

Enough of this technical blather!
Will one of you Poindexters please get out of the house and go find some metal to post a hunt about? I'm dying here! Anything! Even zincs will do...Forget about the 'air tests and GB' and go swing some over dirt please! .
Mud

 

[WV62]

So does ground balance settings above or below the actual ground balance number affect air test results?

Just my opinion the GB setting has very little effect on air test results, reason the only thing moving is the target you a swing in front of the coil. That is why when air testing I just use the default GB.

Ron in WV

 

[MarkCZ]

So does ground balance settings above or below the actual ground balance number affect air test results?

I don't think GB effects air test unless you test at one extreme then test in the other extreme, even then you may not notice a difference. GB is canceling out ground effects (minerals) and this more effects the all metal modes than the discrimination modes. There is NOTHING in the air to cancel out!

Proper GB sets the detector to not go positive on the ground minerals, or go negative on them. Take out the minerals and you've just taken out the need for GB altogether!

This is why they are certain detectors, probably more than we know of where the GB is ONLY in the all metal modes. That's partly because in discrimination there is more than enough discrimination at the modes lowest setting to cancel out most levels of normal mineralization.

Mark

 

[MarkCZ]

So my ground in that location ground balances about 68 and with a starting GB of 60 before up grade lower than my ground and 80 now above my ground does explain my problem. I should have thought of that but with all the other problems being talked about I think I was just locked up on broken detector.

I have only been hunting with the F75 since 2010 so I am kind new at it.LOL

Thanks for the help,

Ron in WV

Big Brother, I know at one point sometime back your were experimenting with "Power Balancing, am I right in that this is slightly adjusting the GB positive for better depth in discrimination mode?
I know at the time you wasn't testing that with the F75, but the F75 manual clearly states that the preset GB will go positive on most ALL soil types, what if a person used the default setting, learned to pinpoint without going to the all-metal pinpoint mode would this give the user a form of "Power Balancing"? I never really got a handle on the power balancing.

Mark

 

[togg77]

Ron FYI my 75 was manuf. 1/14 and the default GB is 60.

 

[WV62]

So my ground in that location ground balances about 68 and with a starting GB of 60 before up grade lower than my ground and 80 now above my ground does explain my problem. I should have thought of that but with all the other problems being talked about I think I was just locked up on broken detector.

I have only been hunting with the F75 since 2010 so I am kind new at it.LOL

Thanks for the help,

Ron in WV

Big Brother, I know at one point sometime back your were experimenting with "Power Balancing, am I right in that this is slightly adjusting the GB positive for better depth in discrimination mode?
I know at the time you wasn't testing that with the F75, but the F75 manual clearly states that the preset GB will go positive on most ALL soil types, what if a person used the default setting, learned to pinpoint without going to the all-metal pinpoint mode would this give the user a form of "Power Balancing"? I never really got a handle on the power balancing.

Mark

Yep little brother I was but it was with a Tesoro and when I did the power balance I would loose AM, it didn't take me long to think that was a bad idea. Now you may be on to something with the F75. Sounds like maybe Monte needs to chime in on this one.

 

[Charlie P. (NY)]

I don't think so. Air is effectively non-conductive so there is nothing to "balance" with.

But there is also no attenuation to alter the signal and no mineral component for the detector to try and interpret a target through.

Kind of like evaluating a flashlight by shining it in your eyes while outdoors in sunlight. Yep, works and is bright.

 

[NE Digger]

Mine did the exact same thing before the second upgrade, and I noticed it immediately after getting it back. When you'd fast grab, even though the machine "seemed" to ground balance according to the numbers, it would NOT quiet down audibly. In fact it would stay quite loud. After the second trip to FT it workes just fine. First time to them they retained my original control head. When it came back the second time the control head had been completely replaced. Not sure if that was a factor, but all is fine with mine as we speak, and I am very happy with it.