depth of f70

[jimmy clark]

im thanking about a f70. i use a dfx,which i love for id.ing gold rings, [ that is hearing the roung sound plus id no. working together. but for as depth it seems to be just avg.im wondering if the f70 can detect. a, dime,fairly good soil, which we have in east tex at 8 or 9 inches without it being to noisey?

 

[Wishful-thinker]

contemplating buying one.

 

[cometguy]

Hi there,
I vote yes. I loved my F70 and it was not too noisy. I had good luck with depth in central Indiana. I only moved up to an F75 in quest of a backlight.
The F70 is light, easy to set up, and runs forever on four AAs.

HH, Don

 

[kascinoh]

Jimmy:

I'd probably vote yes as well. I can't get you real-life conditions as my test garden is covered in 11" of snow, but what I can relate to you is this:

my F70, stock 10" coil, SL mode / -2 threshold / sens 80 / iron notched / disc of 6 will airtest on a clad dime to 11 inches with proper ID (74).

Granted, air tests are not real-life, but this machine has got bags of power/sensitivity, so I would say yes, no problems on the dime.

 

[jamt225]

http://detectorstuff.com/2009/03/09/fisher-f70-review/

"Fisher retained the most useful functions and made them very accessible to the user. Theres also a little something extra under the hood more depth than the F75! Yep, you read that right! In my soil, coil-for-coil, the F70 is slightly deeper than the F75."

 

[wltdwiz]

best machine ive ever used i love mine

 

[Cache Man]

Yes it will, if you turn the GAIN up (Threshold) in my bad soil here in TN my F-70 ground balances at 66 with a DD coil and Gain set on 5 and the sensitivity 90 I can detect silver dimes in the ground at 8"-9" with the coil held up in the air 4" inches above the target, don't worry about the noise. if you turn it down (gain and sense) you want find much, it took me 11 months to figure out how to make this detector perform this good day after day. Good Luck

 

[John LA]

n/t

 

[FloridaBob]

That's great advice. I have been a vacuum cleaner with my F70 up to about the 3 inch depth but nothing beyond. I think that I listened to closely to the posts saying to backoff the Sens and Thres till there is just silence. Makes for a quite hunt...but obviously too quite to get deeper! Can you tell me what setting you start with Thres on while you crank up the Sens to the pointy of instability? and then I assume once you find the Sens setting you crank up Thres to the unstable point as well?

Thanks and I'm anxious to go UP IT a bit!

FB

 

[wltdwiz]

are you in Florida bob ?
no black sand there so you should be able on the dry sand to crank up the sensitivity & run in sl mode
this would give you very good depth
as far as the threshold go up from the setting of -3 to 3 & if the unit acts unstable back down

heres a link on this


http://fisherf75.com/pb/wp_8bad0861/wp_8bad0861.html

hope this helps
walt

 

[ElginTim]

Working some torn up sidewalks yesterday and today, mostly using my CZ-20 because it's jsut quiter and still deep in the cinder and slush under these conditions. Went to the F70 to give it a try and it was machine-gun alley. Solid non-stop low-to-high conductive noise like I was in a pulltab/mem graveyard. Looking up I noticed that GPS locator on the five consecutive gravel trucks alongside the curb there. Thinking it might be the problem I moved about 30 feet in front fo the lead truck and sure enough, was able to FG on a lawn edge to 70, set sense to 75 and thresh to -4 and the unit ran pretty well, but it still got a lot of noise from the asphalt under the gravel bed, a former roadbed under the sidewalk bedding. Had to disc up to 40 to put a stop to the noise and finally started picking coins.

Got many more coins than I did with the CZ because the F70 does better at picking them up on edge as many were. Sadly they were all clad dimes and mems so far. One lonely 5" wheat being the exception.

Always max out sense if you want to pick coins on edge. I've found this machine will absolutely tell you if that target is a coin, flat or on edge, to the limits of it's depth capability. So far as I've been able to see, depth and target ID is much more a function of sense than of thresh. Max thresh to it's limit, then adjsut thresh, once it's quiet up the sense some more until you're not able to adjust thresh to compensate for the background noise anymore.

Last coin I dug today was an 1886 IH at 7 inches and contrary to my previous experience with the F70, the IH read solid 77 clearly.

 

[Dan-Pa.]

All depends on your mineralization and your particuliar unit...Heck getting 8 inch depth with sens at 20 and DE mode ( very low sens). with a smooth running unit...
Haven't hit an old area with little trash to give the SL deep mode a try.....so as far as I am concerned when they say capable of 13-14 inches on a coin in the manual
it may be possible when conditions and settings are right.....

 

[FloridaBob]

Yes Walt, I am in Florida. Thanks for the link as that was quite beneficial. I need to work a good bit in the test garden with sandy soil conditions to really get a better grasp on the interplay between Sens and Thres. I did get out this weekend and did a very quick re-hunt on an old yard that I cleaned out down to the ~3 inch level of clad and memorials. I went a little hotter on Sens (75) and cranked the Thres up to +3 and she was chattering away but I did pick up a 1936 and 1916 cent that I missed on previous hunts. They were about 4-5 " deep. I have no doubt in the power of the F70.....the responsibility is all mine to learn its intricacies. As they say "It's the Indian...NOT the arrow!"

Thanks again for the response.