F70 questions

[limegoldconvertible68]

I have been trying to get out with my new machine for an hour or so everyday after work and my comfort level is going tremendously. It seems that my phantom signal problem is actually just very very small pieces of metal. I have spent some serious time at a few of those and each time I finally came up with something resembling a piece of bird shot. Turning down the sensitivity does work but I would rather keep it cranked up and deal with it knowing I am getting max depth. One thing I notice a lot is that when I remove my initial plug the machine changes its ID of the target. Many times I get a great reading of 69-73 with depth of 4-6 inches. I cut the plug and run the machine but over the hole and now it reads 95 and it always ends up as junk. Is this common? Does it ever lead to something good? When I am coinshooting I am tempted to pass up anything reading in the 90's because every single thing I have dug in that range has been trash. So far the detector has impressed me. I can't believe how it pulls in the deep targets. With my old machine I knew when a target was at the end of it depth range by how weak the signal was. I have yet to notice a weak signal with the F70 even though I have been down to about 10 inches already.

 

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[George (MN)]

I'm not a top expert, but will try to help. It seems most coins down a few inches or more in mineralized ground bounce from maybe 55-90+. If ID is consistently 95, I think that's even higher than expected for a silver dollar. So large trash, maybe hot rock, or small trash too weak for valid ID # would be likely.

Some of the weaker signals, but still maybe not faint, will occur using SL all metal mode, thresh -9 to -5 and a sensitivity of 30-40. These settings will give a consistently correct ID on a quarter to 11" in my air tests. It may be possible to turn up sens more, but this will make beeps stronger. If one prefers modulated audio (deep items weak beep), these settings may be desireable.

I'm not real familiar with ammo, but assume birdshot is smaller than a dime? If so, sensitivity to smaller than coin-sized objects can be reduced by lowering threshold. This will cut depth on coins, unless you increase sensitivity. Negative threshold & high sens seem best for deep coins.

I tried DE disc 25, thresh -1, tones 4 H, tabs notched, & beeps all over but coin beeps wider. My 5" deep clad dime sounded off even with coil 3" above ground. Hope this helps! HH, George (MN)