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F 75 LTD first impressions

J

jimmyk

New member
Hi all:

I put my F 75 LTD together this AM and ran through a battery of air tests. Very impressive. From DE mode to BP there was an inch and a half to three inches improvement, testing ten differnt targets. I then tested it in CL mode. I wasn't expecting much, but WOW. It is only slightly slower than BP mode. I couldn't really see much difference between BP and DE speed-wise. CL mode added another two and a half to four inches ON TOP of the BP mode. I had as much as a six inch differnce between DE and CL on some targets. I see hugh potential with this machine.

There was a "Read This First" paper in the box. I noticed something interesting in it. It said "You may find that sensitivity increases as you incread the discrimination level". I put it to the test. Normally, on the F 75, as you increase your discrimination you lose depth. I tested it at disc. level of 5 in DE and got very good depth. At dis. of 10 it dropped off a couple of inches. Normal. At disc of 10, it was getting readings almost identical to the disc 5 setting. At disc 25, it added and inch and a half to two inches of depth. Amazing. BP with disc of 25 added another inch to three inches on top of that. I didn't do it with the CL mode, since it has a little slower recovery, but I'm sure it would be even deeper. Very interesting.

I normally relic hunt in all metal, or 0 disc. with two tones. I took it to my test garden and the increase was there in the ground, as well. It seemed to actually run better at disc of 5 rather than 0. I have a ten inch dime and a ten inch .58 cal. minie ball buried. It wouldn't hit the dime in disc. but blasted on the bullet. I could raise the coil four inches off the ground and still get it. In CL mode I could raise it six inches and get it. It was loud in all metal, as well.

I plan on hitting some pounded Civil War sites next week to see what I can dig. Right now, I'm very pleased with what I see. Having used an F 75 for over two years, there was no learning curve to slow me down.

Thanks for looking, and keep on diggin'

jimmyk in Missouri
 
n/t
 
Mine was shipped today and I imagine it will be here next week. If I get the same depth out of mine as you are saying you are getting with yours, than I wont have a use for my TDI. We'll see when mine gets here.
 
Jimmy thanks for the report. It's very interesting that it wouldn't hit the dime at 10".

I'm curious what the soil is like in your test garden? The two main F75 Ltd reports I've seen have been where the soil is apparently inert or close to it, and given those ideal conditions I'd expect phenomenal results (should get almost as much depth in that soil as an air test), but I'm curious how it'll do in more complex soil conditions.

Thanks,
Brian
 
jimmyk said:
Soil is sandy/loamy.

jimmyk in Missouri
Click to expand...

I take it there's no mineralization? Do you recall what the GB # is when you GB, and what the dirt/FE03 meter reads ?

Thanks,
Brian
 
I'm a little north of you near Knoxville and don't see much of the red clay you have in your neck of the woods. But I wanted to ask you about using all metal on your sites.

I was helping a guy find the corner pins on his property and found the first one easily enough, hunting in all metal. But when I moved to the area where the second one was supposed to be, we dug several items without finding it. The one we found was basically a piece of rebar stuck vertically in the ground, so I was basically searching for a iron target the size of a half dime or so.

One thing that bothered me is that I noticed that in all metal, my detector wasn't as sensitive to iron as I would have liked (in that situation, of course). I finally figured out that my machine wasn't ground balanced correctly. But when, as a test, I switched to discriminate and set my machine on 0 Discriminate, that same iron pin wouldn't even give a broken signal on my machine.

For relic hunting, that might in itself be a good thing, but it puts doubt in my mind as well. Hence my question:

In hot (iron) ground, when you GB your detector to that ground, aren't you in essence discriminating that ground out? And if you're trying to tune out that irony ground, couldn't that in itself result in missed targets, because it's basically GBing iron out, to a certain degree?

Just curious, but it got me to thinking.
 
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