Noticed something on my F75ltd

[WV62]

I noticed when I had a test garden that my F75ltd would read all my coins that were over 3" deep as iron. Was wondering if anybody else has seen this with their 75's?

Ron in WV

 

[Elton]

No Sir.is it a clean garden down deep........Might be pieces of iron causing you problems

 

[WV62]

Elton,

I did clean the garden but was having so much trouble with the 75 that I pulled the coins. But I started off with a couple of coins at 3" then dropped down an inch and the last coin was a quarter at 9".

Ron in WV

 

[TerraDigger]

Were you using the 11" DD coil. They can misread up to 3" from the coil bottom. Its a DD coil design issue, not a mfg flaw. Just a thought on what issue might be.

 

[NE Digger]

how conductive is it? The only time my LTd will report a coin as possible Iron is if its on the extreme edge of detection, or its heavily masked, or if its in very conductive soil.

 

[WV62]

how conductive is it? The only time my LTd will report a coin as possible Iron is if its on the extreme edge of detection, or its heavily masked, or if its in very conductive soil.

The soil is pretty mild here, most everywhere I GB about 54 to 57.

TerraDigger,
Yes I was using the 11" DD coil.
And the reason I ask the question was to see if the edge of detection is around 3 to 4 inches.

Ron in WV

 

[gmanlight]

Something does not sound right.
The GB # is not the true indicator of how hot your ground is .
The FE bar is a better tell of how mineralized the ground is.
My GB is Hi 60s to low 70s but my FE bar almost never even hits one bar
and my ground is mild.

 

[Elton]

n/t

 

[NE Digger]

Most of my soils here for instance Gb 65 to 70 or so (occasionally a bit higher), but the severity of it is very mild, as evidenced by the lack of any bars on the Fe304 meter.
I still think you have a fair amount of iron in your soil by the sounds of it. How many bars do you get on the Fe304 meter while your sweeping? Is it a loamy soil or more clay like? is there a substrate under the dirt you dig in? We have a few areas around here (very few) that mess with us, and its a thin layer of silt over a pretty dense layer of clay. the good thing is the clay stops the targets so they dont get too deep.
You also may be hunting in a coal region, with cinders and Culm everywhere. That will give most detectors fits. Hard to say, but somethings going on........

 

[osgood]

I use three tone, there is no way my f75 ltd would id a coin at 3 inches as iron, i use the 11 inch double d. Havent had an issue with that either. Just puttin in my feedback. good luck, CO

 

[WV62]

Guys you kind of got on that Fe304 bar graph, I really haven't paid much attention to it. I know I have seen it give some indacations at times but to say it is running high or low I will need to check tomorrow.

Went back to my manual for a little refresher and here is what it said.

The Fe3O4 bar graph on the LCD display indicates the amount of magnetic mineralization. The
searchcoil must be in motion to measure Fe3O4. The most accurate measurement is obtained
by pumping the searchcoil, as in the Ground Balancing procedure.
The two-digit G.B. Setting number displayed on the LCD indicates the type of ground
mineralization.
Some typical ground mineralization types are:
0

 

[gmanlight]

PM sent

 

[WV62]

Ok here is my Fe304 bar graph readings.

3= none

1= none

.3= some

.1=
Most readings in this range .03 to .1
.03=

.01= all above this

my GB numbers are 54 to 57

So from that can anybody tell me if my soil is hot or not? Also is the thought still that the soil is my problem?

Ron in WV

 

[NE Digger]

just for the heck of it, have you tried airtests outside somewhere away from any interference? I'd be curious what those results were, to establish a baseline for you. All its doing is taking the soil out of the equation and testing the potential of the machine.

 

[WV62]

Maybe can work in an air test tomorrow, I am in the middle paint out some rooms, but I have my wife convinced I need 4 hours between coats. See if I can work something out.

New problem maybe, when I went out this morning for the Fe304 readings and when I turned it on it didn't come on, checked for batteries and they were in there. I turned it back on and it didn't come on, so I just watched it and after several seconds it powered up. This happened one time before but at the time I just wasn't sure what was going on but today I was kind of ready for it and I am sure this time. Anybody else ever had a problem like that.

Ron in WV

 

[shooter]

None fact that paint fumes intoxication takes at least 6 hour to fulling clear the lung and blood stream.

 

[Elton]

n/t

 

[WV62]

Thanks shooter I will pass that info on maybe I can get another couple hours of testing.

Elton,

Right now I have the little 6.5" elliptical on it which I did pick it up used, I am trying to get a picture of it powering up, I noticed several times the back light would start to come on but the Big LE in the middle wasn't coming up like normal. Now that I am trying to catch it, it won't do it. Anyway now that you say maybe the coil I will change it and the batteries as soon as I give up on the picture.

Ron in WV

 

[MarkCZ]

Not an F75, but my F2 started acting up not wanting to power up, but it got bad pretty quick. I had to send it to First Texas for warranty repair, they had to replace the membrane touch pad. It had to be defective, that little F2 even after the repair hasn't seen 20 hours of service, the pad had NO damage and no signs of wear.
Its working fine now.

Mark

 

[WV62]

just for the heck of it, have you tried air tests outside somewhere away from any interference? I'd be curious what those results were, to establish a baseline for you. All its doing is taking the soil out of the equation and testing the potential of the machine.

Ok NE Digger, I am still painting the inside of the house, but my wife is out running the roads, left me here to work. As soon as she cleared the driveway I headed outside with the F75 for that air testing. I taped a quarter on a stick and stuck it in the ground. I couldn't get it to read iron at all. When I would get to the edge of detection the ID would drop to a dime and beyond that it was just gone. Being I was by myself and didn't have a lot of time I could get a good measurement but I was past 12" I am pretty sure.

Tried going through the different process modes and the Cache process looked to be detecting the farthest but I had to drop the sensitivity from 90 to 45 to settle the machine down. Still the farthest at 45. I had the disc set at 6 for all the testing and I was using the 11" DD coil.

Ron in WV