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Ground Tracking Prob???????????
- Thread starter mickfin
- Start date
Larry (IL)
Well-known member
I guess I'm not familiar with a ground tracking problem Mick. I'll let someone else handle this one.
I'm not sure what you're referring to with this statement "Nothing in the manuals + or - witch is Hot Ground" What do you mean for the "+ or -"?
In the sensitivity zoom window, you see the signal strength at a percentage of when the detector overloads. This isn't on any specific frequency - it's overall (the reading is on the incoming signal before it has been separated into the 3 frequencies). So, if you saw a percentage of 100%, the detector should be overloaded and you wouldn't be able to trust the data. The goal is to keep the ground signal at about 10% so that you still get depth and can still see shallow targets without overload.
In the sensitivity zoom window, you see the signal strength at a percentage of when the detector overloads. This isn't on any specific frequency - it's overall (the reading is on the incoming signal before it has been separated into the 3 frequencies). So, if you saw a percentage of 100%, the detector should be overloaded and you wouldn't be able to trust the data. The goal is to keep the ground signal at about 10% so that you still get depth and can still see shallow targets without overload.
Larry (IL)
Well-known member
I would suggest going to the Ground probe in the Sensitivity Zoom window and and set your Gain as recommended. I have gone two number higher trying to gain a little more depth, but it is a bit noisier too. You can't go wrong following the ground probe settings.
Yep, Larry is right.
But, to answer your question... Ideally all targets and ground should fall between 0 and 180 degrees (positive). In air, when you zero the detector, you will see phases of both positive and negative values - those are just noise and don't pay attention to them. If you are getting a negative phase for any of the frequencies when you lower the loop to the ground however, you probably have an overload problem. A ferrite bead should come in at 178degrees. Most ground that we see is 178 to 165 degrees (except salt which falls close to 90 degrees - different for each frequency). The VDI reading at the top of the screen is converted from the phase into VDI units like you'd see for normal targets (VDI = 19 = nickel, VDI = -78 = probably iron...) It's either going to be from the strongest signal if the detector is running best data, or the average of the two strongest signals if correlate is selected.
Hope that helps some too. But the best way to get at least a starting point on gain is to zoom the sensitivity live control.
But, to answer your question... Ideally all targets and ground should fall between 0 and 180 degrees (positive). In air, when you zero the detector, you will see phases of both positive and negative values - those are just noise and don't pay attention to them. If you are getting a negative phase for any of the frequencies when you lower the loop to the ground however, you probably have an overload problem. A ferrite bead should come in at 178degrees. Most ground that we see is 178 to 165 degrees (except salt which falls close to 90 degrees - different for each frequency). The VDI reading at the top of the screen is converted from the phase into VDI units like you'd see for normal targets (VDI = 19 = nickel, VDI = -78 = probably iron...) It's either going to be from the strongest signal if the detector is running best data, or the average of the two strongest signals if correlate is selected.
Hope that helps some too. But the best way to get at least a starting point on gain is to zoom the sensitivity live control.
I think that the answer is yes? The phase tells you what kind of ground you have (but I don't know the numbers that go with various types of ground - Bowling Green (in Kentucky?) soil I hear is around 170). The signal strength on the bottom of the screen is going to tell you generally how strong the ground is. But for picking gain, the best is to use zoomed sensitivity. Maybe somebody else knows what phases for different grounds there are.