F70 Depth

[MichiganJason]

I've been out detecting every day since I got my F70 which has been about a week now. I have been finding a lot of things but still have yet to even get a signal on anything over 5 inches...every single time I get a good signal it's 3 inches or less. I've been experimenting but nothing seems to help in the depth department. I wonder if I'd get better performance from the 10'' coil. Maybe it's this Northern Michigan ground? With my Omega8000 I was able to get 7-8 inches on a coin frequently...doesn't the F70 and the Omega8k basically have the same specs?

 

[mudpuppy]

You will be reaping the benefit from some of us that have been swinging this unit pretty much DAILY for over a year. A lot of times, (I think its ground balance) the TID will say 3" even if the coin is 5. I sort of got used to it and can tell the depth by the strength of the pinpoint squeal. If I take my time and gg properly, the depth reading is accurate. I have this football field where I shoot a lot, its been great practice since the sidelines and bleacher areas are full of trash, but the main field is very clean, there I can run sens up pretty high, and thresh pretty close to zero but still neg. I like the disc low, like 10 or less, I did get a 8" silver washington q outta there, and 2 7" silver rosie dimes, both occured on pretty damp soil days. I had to cut the sod and get my 6" probe on in there to root it out. I got a 1910 barber dime in the outfield at a baseball field on a day like that, and it was 7" at least. all very solid signals, On the beach in the wet sand at the waters edge, you will dig some deeper targets, probably because of the moisture. If you do try the 10" stock, let us know how it performs as I have 0 hours on mine...Mud

 

[MichiganJason]

I just went out with the 10'' and can honestly say I will never use the 11'' again. I went to this small patch of grass near my house...maybe 20ft by 20ft that I did yesterday with the 11''. I found 7 old buttons in one hole, a couple wheats, and a 44d Merc. The 10'' ran so stable, and pinpointed better, and the depth seemed better...the merc was about 6-7 inches deep. I'm wondering if the 11'' is defective.

 

[mudpuppy]

n/t

 

[TerraDigger]

Even though its the F70 being discussed, Monte (FMall Detector Guru) prefers the concentric coil on his Omega instead of the 11" DD for coinshooting. And his soil in the Pacific Northwest is very mineralized. Conventional wisdom states the 11" DD should be the one to use because of the heavy mineralization. But he prefers the concentric. Jason, some of his reasons are what you stated.

 

[MichiganJason]

I was running it at disc 20 sens 70 thresh -3 and let me tell you it's like a brand new machine.

 

[ez4sure]

i agree since my dd coil messed up ive been using the stock coil it gets better depth with it i can run the sense much higher that might be why . the dd is better in trashy areas and pin points better in my opinion so mud you should try the stock coil for a day and give us your opinion hh

 

[ElginTim]

Wish I had a concentric coil to try out on my F70, guess that's #1 on my list when I get this clad pile tumbled. I've heard so much about how deep the 11" DD is but have not experienced that myself in two years with this rig in pretty much every soil condition Northern Illinois has to offer. Still like the coil though I prefer the 5" DD for the sites where I use the F70 most often.

Thanks for some good input Jason!

 

[MichiganJason]

Exactly, the 11'' for me is mediocre at best. Oddly, when I ran the Omega the 11'' was great and it was the 10" I couldn't get great performance out of. The 10'' on the F70 allows at least for me, the ability to be more stable at higher sensitivity levels. Some times that's all it takes...a nice quiet hunt that allows you to separate the good signals without getting bombarded with chatter. Bigger doesn't always mean better I say. When I use to swing a Coinstrike, I kept the 5.75'' coil on at all times. The depth was about equal, you could really cherry pick targets, and the ground balance was simple being such a small surface area.

 

[mudpuppy]

I've got some commitments to attend to for the next few days, but by thursday I should be able to give the 10 a go...I'll take it to some places I've been to a lot and see what it can do.
When I bought this unit, everybody was saying the 11dd really makes the F70 shine. It does for shallow quick brooming, and maybe the concentric is the ticket for deeper silver..I sure could use a couple of silver coins this Fall. i will say this, those DP tones are great in the trash. Thanks Jason!
Mud

 

[Cache Man]

you just stated your problem. the 11" DD coil gets 1 1/2" inches more depth than the stock coil, your settings are all Wrong to get any depth you need to set it on sens 99 and threshold +4-9 with the DD coil, you can click on my posts and research the F-70. HH

 

[MichiganJason]

With the 11'' dd coil, I can't even turn the sens up past 75 without constant chatter and false signals.

 

[Cache Man]

F-70 and F-75 are really noisy when turned up BUT they do not false, they are the only detectors that can be run wide open and never false, you should be running in 3h, tone hunting only if you are coin shooting. you can't go by the screen if you do you will think its falsing, to get any depth you will have to get used to the noise. if you are swinging the coil at the rate that you should be you want have time to here much noise. you need to research EMI and you will find out how it affects the fisher detectors

 

[MichiganJason]

Well I'll phrase it differently....I like the 10 inch coil much better.