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Fisher f70 - Xterra 705?

Steve,
As with all tech in the VLF world it only makes sense that the concentric coil gets better ID at depth. The DD coil is not designed for target depth, but for target separation.

Having been to a lot of the sites where my CZ's cannot id good stuff so well anymore, the F70, especially with the 5" DD coil will rock the ground. There is an amazing amount of leftover silver in the intermediate ranges, say 5-8 inches. Moving it slowly through the bottlecap sea uncovers the goods readily.

That's why I got the F70, and it has been fulfilling its mission in that respect very well so far.

Now about that 15" DD coil...... Yeah baby, that's what I'm talking about! Got me waiting to see the first results.
 
Again, Tim, thanks for your obviously experienced perspective. The F70 is SO deep, that with the 5" DD, you STILL get plenty of depth. I'll have to run that coil more often. It's the "mental" block of using SUCH a small coil that stops me from hooking it up more. I just seems SO small!! :)

Steve
 
yup I'm pondering a 5" for my F70. the last couple of sites i visited were infested with nails,debris ..and as good as the stock coil is it still had trouble isolating
signals from nearby ones..It an interesting read that your coins ID as iron. the last dime i found ID'ed as a dime at 6-8" no problem.
I was getting thousands of pull tab signals at various depths and dug several to appease my curiosity. And if i used slow mode the close together signals Overloaded it.
Oh yeah my soil is very mild if your wondering.
 
Curtis --

I have ID'd deeper coins as well -- up to about 8"; not sure what the deal is in my test garden, and why the Gold Bug Pro is having no trouble. Weird. Yes, I also agree that slow mode is best for lower trash areas, but it sure is a benefit to have in some cases.

Steve
 
Hey guys I cannot understate the impression the 5" DD coil has made on me with the F70. I was never impressed with my 5" coil on my CZ's but then again I believe I got a lemon and never want to say, "fooled me twice" so I never replaced it.

My first instinct with the F70 was to go bigger, so I got that huge 12*15 SEF coil. It was worthless. Lost depth in every target category. Returned it and decided to try the smallie. WOW! It almost equals the 11" DD coil on depth for target ID, both numeric and audio. Clearly beats it in target separation hands down. I've pulled 7" deep silvers that id'd correctly out of the ground with it often. The silvers on edge, along tree trunks, under roots, etc.. It nails them. And I am talking about trashy areas.

I can still get bested by some of the ETrac guys and the F75 guys I'm sure. But if you're using the F70 or F75 against most ETrac users, you will find that in iron sites, their machines will null out over iron and if there's a silver under/next to that iron, it's yours. I think that's dependent on their settings, but I've done it more than a couple times now.

There is a LOT of silver left in the intermediate ranges in most parks, just gotta go at it the right way.
 
I only used the stock coil 2 time and both time it chattered so much I about sold the f70. could not get it to quiet down at all so decided to get the 11" dd and now I can run the sens 90 in most places with out the chatter. the deepest coin I found was a merc at 7" and it did id right. I am really glad I kept the f70 and tried the 11".

Chris
 
Good message Tim --

But, I will say this, I get SMOKED by good Etrac users -- NOT in raw depth, but in ID info. This morning, in fact, was another case in point. The ID on those machines with depth is just unbeatable. They have SO much info at their disposal; I feel like I'm "naked" with the F70 sometimes. SURE it goes just as deep; even my Gold Bug DP (11" DD coil) was DEEPER than their Etracs today, when they were running small 5" excelerator coils. I could hear several targets they could not (though I was using the larger coil), and I've never had an experience where they could hear a target that I could not, with my F70 -- even when they use their larger coils. So depth with these Fisher machines is not the issue, w.r.t. the Etracs. It's the superior ID information they have, that really helps them understand when to/not to dig. Yes, experience does play SOME part (they have it, I don't, for the most part), but it is clear that they have superior target info at their disposal, on those machines.

I dug a 1927 wheat at 5" today that IDd properly on the Gold Bug; they each dug wheats, and each dug a mercury dime (3-4"). Now, I would have hit those coins had I run over them first, as they ID'd clearly on my Gold Bug when I checked out their targets. So this time, it was not a case of them finding things I missed. Today, especially while using my F70, it was the targets I chose to dig based on MY info, that they -- after checking with their machines, would NOT have -- that was the issue.

FWIW, I did NOT use the F70 5" DD coil today, and should have...

Steve
 
Had many of those days myself. Today was the opposite for me. I got to the good targets first, for the most part. I was using the 5" coil, in a trashy area of one of Chicagolands oldest places on record. We didn't get close to the original period in finds but I got the better bunch of goodies and the only silver, a '29 merc. One Craker Jack token and one governor's race token from the 1912 election. tent grommets, buttons, old bullets, new bullets, compact, jack knives and a gold ring.

The other guys were using an ETrac, an MXT and a V3i. Together they beat me on coins with a colelctive 2 IH's and one V nick and one buff but missed out on the other things that make you go 'Wow" or "nice" when you pop 'em out.
 
3" deep, in loose wooded soil. ID'ed a solid 76. It was next to an area where the local hoodies obviously enjoy growing broken glass, screw caps and pulltabs more than they enjoy growing grass. Some pics of the goodies I got today.

Note the blob that the gold ring is encased in. Aluminum, plastic and for all I know, a knuckle joint or two. Now that was an unlovable signal bouncing like crazy with no sweet spot. But pinpoint gave a solid target under the 2" of leaves and 2" of dirt. No good reason to dig it. But then again I could have said that for the 20+ pulltabs I popped out as well.

The second pic includes two rocks of what I think is galena, (native lead) and my primary motive supporting that notion comes from the site being on the original Galena to Chicago trail at a long gone river crossing.
 
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