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F70 Uncovers Benchmark Relics - - -

dahut

Active member
There is a large, undeveloped field area near my house that I have suspected for some time might hold a few good relics.
100 yards away, Barber coins and trade tokens have turned up, so the chance seems to exist. To date, this theory remains just that - a theory.
I have yet to uncover anything really good there, but I continue to go back from time to time. You know how it is, you just can't give up too easily on a place.
I both hope something will eventually surface there and I find it is a great place to "relic hunt" close to home.

With the latter thought in mind, I finished today's errands, grabbed up the newly resurrected F70 and shot on over there.

Now, I say "newly resurrected F70" for a reason. When I got this unit, I had traded an older Eagle II SL for it. No sooner did I get it in the field than it went nuts with electrical interference. The guy I got it from is a straight arrow and said he had the same problem - he reckoned it was just the way the F70 behaved. See, he'd heard all the complaints about the erratic nature of these new Fishers, too.
Well, that wasn't gonna fly with me... I needed to make this thing work, so it could become my primary unit.
So at his suggestion, I contacted Mike Scott at First Texas.

Long story short, that swell, heckuva guy up there in Wisconsin took good care of me. He stuck by me until he KNEW I was taken care of right.
I know I keep pounding this drum, but there are many people out there putting down the new Fisher and First Texas as producing junk equipment. These 'experts' like to tout it as a company more focused on flooding the market than caring for their customers and their reputation. Nothing is further from the truth, I'm here to tell you.
Anyone wants to ask me more about it, just send me a message. For now, I don't want to tie up more bandwidth here.


So I got he F70 to the field and decided I was going to wind it out.
"Just how far could I get with it?" I wanted to know.

Here's the settings I ended up hunting with:

DISC LEVEL: 05
SPEED: SL
SENS: 85
THRESH: -1 to 0
Tones: dP and 2F, I searched in 2F and then switched to dP to "process." Aint this FUN!!
Notch: N/A


To those of you who use the F70, you'll recognize some fairly high numbers here. I could get the THRESH up to +1 on occasion, but it got too "chirpy" at that setting, so I backed it off. Later, I realized I could have lowered the SENS and boosted the THRESH as an alternative, but I really wanted to wind out the SENS this trip. Well, I got my wish!

I was also able to ground balance the detector, something I could rarely do before - the electrical interference issues simply prevented it in the past. I attained a steady 54-55 ground phase, which is normal mid range for this area. Oh, Joy! :clapping:

SO what benchmark relics did all this get me? Glad you asked. Here they are:

[attachment 114354 DSCF0032.JPG]

I know, I know I dragged you along this far to look at a bunch of shot shell hulls?! Well, in a word, yes.

The thing about these is they are brass, and come hard in the mid range, from 25-50 on the VDI.... right where a lot of other desirable relics land.
You know, things like buttons and other brass items, for example. Too, there are a couple of .410 bases there. Those are not at all large and the F70 nailed them.

The fact that many of them came from good depths is also notable. Most were from what I'd estimate 4"-8" and hit both hard and repeatable. There was no doubt something was there, as opposed to the occasional induced chirp or pop. I noticed something else, too.

At lower GAIN and THRESH settings, like I've been using on the trashy high school site lately, the coils' detection field is tight and relatively narrow. But at the higher settings I was using today, the coil's detection field is noticeably expanded. "Ballooned out," if you want to think of it that way.
This bodes well for future relic hunts, yes sir.

So, I count this trip a success in more ways than one. Not only is it obvious the F70 is now working correctly, but it sure can find things!

Thanks for looking and following along!
 
Better head to your basement and start doing some crafts. :)

metamorphasis3.jpg
 
Hey, one of my best relic sites started with nothing more than brass casings. More desirable relics started showing up later. Thanks for the insights on the F70. Sounds like the F75 and yours are cousins that speak the same language. - Jim
 
Been running my F70 sensitivity on 25, threshold on +9 with the litttle 6 inch elliptical loop. Been going very deep for a small loop. Discrimination is set on 20. So many hunters are missing the boat, but that is fine with me.
 
Been running my F70 sensitivity on 25, threshold on +9 with the litttle 6 inch elliptical loop. Been going very deep for a small loop. Discrimination is set on 20. So many hunters are missing the boat, but that is fine with me.

I could have indeed gone the other way, as you mention here. But I was using Andy Meyers' new F70 information.
Simply put, Andy suggests you use the ground phase results (ground balance numerical indication) as your guide to adjusting gain.
This is all based on the fact that there are really two gain adjustments on the F70.

One is the main signal gain in the receiver, called SENSITIVITY.
The other is preamp gain, which specifically amplifies the signal received from the coil. Fisher calles this THRESHOLD.


There is little mention made of this in the manual. In fact, I've read it several times and didn't see it!
So here, then, are Andy's recommendations:

- If you ground balance low, then run the receiver gain (SENS) high - and the pre-amp gain (THRESH) low.

- On the ther hand, if your ground phase results are high, reduce the receiver gain (SENS) and increase the preamp gain (THRESH).

54, in my location on that day, is pretty low. So I upped the SENS gain until I felt I was max'd out and then worked the THRESH until that, too, peaked.
This two pronged adjustability is a feature of the F70 that sets it apart.

Many people have heard rumors and innuendo, along with some occasional whining and griping about the new Fisher F75/F70.
Like all dirty laundry, that sort of thing gets around long before any good news gets out of the gate.
So, if people are missing the boat, well, okay. They deserve it, I suppose, for believing only the griping. I've made that mistake, myself, in the past.
 
Thanks for that info Dahut, is there further information from Andy Meyers? I am not familiar with him and would like to read more.
 
gates21 said:
Thanks for that info Dahut, is there further information from Andy Meyers? I am not familiar with him and would like to read more.
Oh, my dear friend, there is indeed. Andreas "Andy" Meyer is a veritable fountain of information. Visit here to see more:

Andreas' Fisher Site

... look down the site menu on the left, near the bottom. His latest results with the F70 are newly posted there.

Andreas is one of those guys to whom we should give an award for all they do to help us. Monte Von Berry, Mike Hillis, Bill Ladd, John Bortscher, Bill Revis, TabDog.... these are a few others that come to mind.
These guys are hobbyists, working tirelessly to advance the hobby for all of us, in one way or another. And, as far as I know, they currently receive no remuneration or gratis proceeds for it, except that which they earn on their own merit. It's still just fun to these guys.

I can tell you this - If Andreas says it, you can take it to the bank.
 
John(Tx) said:
He is a wealth of info on MDing using Fishers and Teknetics and others I'm sure. HH John
He is. It was his comments on the Garrett 1350 that first caught my eye.
 
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