Steve from Ohio
New member
Went out today after it rained for the last two days. Went to a local city that has a lake in the center of town with a park around it. The park is about 120 years old. The area was trashy with some pretty bad ground readings.
I started to detect when a guy came up to me and started asking questions about the F-70. Seems he has tried to detect the park for several years and could not find much at all.
I told him today I found two gold rings, a silver ring and several coins. He was amazed. I was too because the ground was real trashy and the minerals in the ground were reading 85 almost everywhere I was at. The dirt bump was at 3 bars.
We started to do some tests with my F-70 on a target that was reading 5 inches down at a reading of 84 but also it was jumping to 14 to 20. The F-70 did a slight click (almost un-noticeable) after hitting 84 and then read in the iron area. It did the exact opposite after swinging back. I was running in the discrimination mode, DE speed,
notching out iron, foil, tabs, and zinc. Sensitivity was set at 40 due to the bad ground with default speed and a -5 threshold. Running 4H tones.
I thought to myself that my F-70 must be acting up. I did a reset and it still was reading 84 and then jumping to 14 to around 20.
So I figured I might want to test some things out on this obvious target that I was not sure was a quarter or what.
I first did a swing test. I swung the metal detector at a regular pace and of course it read it fine. I then sped up the swing going faster and faster to see when the F-70 would not read whatever it was. I could not swing it fast enough for the F-70 not to pick up that target. I was swinging the F-70 so fast that the coil looked like a blur as I moved it. Readings jumped from 84 again to around 20. It was hitting something.
Quite impressive.
I then did a air ground depth test. I had brought along a wooden yardstick and set it up to measure how high I could go until the target faded out.
I was able to swing the F-70's coil up to 8 inches before the F-70 just could not detect that target any longer.
I then dug up the target and it was as the F-70 had said at 5 inches. The problem about that was that it was a small piece of rusted iron in the hole and my Vibraprobe 570 hit that. I thought " Oh great, I have a machine that just loves iron and reads it at 84 and 14 to 20."
I removed that iron and ran it across the coil..a very small click and a reading of 15. OK...discrimination seems to be working. So I scanned the hole with the F-70 again and boom, the 84 reading. So I took the Vibraprobe and started to probe around and there it was, a 1953 Washington quarter exactly at 5 inches about 2 inches to the right in the side of the hole near where the iron was.
The F-70 was impressive with that quarter and piece of iron. I cannot imagine too many other machines out there being able to recover that fast.
Found some clads ($5.72) and hit a few pieces of aluminum can that was hit with a mower.
A pretty good day overall and I was able to learn a lot about the F-70 and what it can do.
I started to detect when a guy came up to me and started asking questions about the F-70. Seems he has tried to detect the park for several years and could not find much at all.
I told him today I found two gold rings, a silver ring and several coins. He was amazed. I was too because the ground was real trashy and the minerals in the ground were reading 85 almost everywhere I was at. The dirt bump was at 3 bars.
We started to do some tests with my F-70 on a target that was reading 5 inches down at a reading of 84 but also it was jumping to 14 to 20. The F-70 did a slight click (almost un-noticeable) after hitting 84 and then read in the iron area. It did the exact opposite after swinging back. I was running in the discrimination mode, DE speed,
notching out iron, foil, tabs, and zinc. Sensitivity was set at 40 due to the bad ground with default speed and a -5 threshold. Running 4H tones.
I thought to myself that my F-70 must be acting up. I did a reset and it still was reading 84 and then jumping to 14 to around 20.
So I figured I might want to test some things out on this obvious target that I was not sure was a quarter or what.
I first did a swing test. I swung the metal detector at a regular pace and of course it read it fine. I then sped up the swing going faster and faster to see when the F-70 would not read whatever it was. I could not swing it fast enough for the F-70 not to pick up that target. I was swinging the F-70 so fast that the coil looked like a blur as I moved it. Readings jumped from 84 again to around 20. It was hitting something.
Quite impressive.
I then did a air ground depth test. I had brought along a wooden yardstick and set it up to measure how high I could go until the target faded out.
I was able to swing the F-70's coil up to 8 inches before the F-70 just could not detect that target any longer.
I then dug up the target and it was as the F-70 had said at 5 inches. The problem about that was that it was a small piece of rusted iron in the hole and my Vibraprobe 570 hit that. I thought " Oh great, I have a machine that just loves iron and reads it at 84 and 14 to 20."
I removed that iron and ran it across the coil..a very small click and a reading of 15. OK...discrimination seems to be working. So I scanned the hole with the F-70 again and boom, the 84 reading. So I took the Vibraprobe and started to probe around and there it was, a 1953 Washington quarter exactly at 5 inches about 2 inches to the right in the side of the hole near where the iron was.
The F-70 was impressive with that quarter and piece of iron. I cannot imagine too many other machines out there being able to recover that fast.
Found some clads ($5.72) and hit a few pieces of aluminum can that was hit with a mower.
A pretty good day overall and I was able to learn a lot about the F-70 and what it can do.
