I have about 5hrs with the new 11''DD,I have been pulling coins out with it. What I have noticed from the very first time is, I have found it to be very noisy. I can get it to run somewhat quite with low SEN-20-40 and Thres -3-4-5 -Disc1-5 and changing the frequances. Is this normal with 11''DD???????------after1----Thanks
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F70 and 11''DD
- Thread starter After-1-
- Start date
I don't have the big DD on my F70 but we have an ATPro with an 8"x11" DD my grandson and I have used for water hunts. I agree there is a lot of noise compared to the elliptical. Just the difference in the way it looks at bottle caps opens a whole new area of noise right where we like to listen for big silver. I like the coverage though and their pretty good in mineralized soil and EMI conditions but you need to keep them ground balanced--------Hope this helps -------IB
A1 That is another reason why I didn't like the 11" DD coil. I am not a fan of DD coils. How about another site? Does it do that on other sites? There is a return policy awaiting, my friend. How about Disc@20? ,Sens@53? and it gets 4-5" with the 6.5" coil. Just let me know and don't get frustrated it isn't worth it. PM coming........Z
WV62
Well-known member
For sure if you are in an area with EMI the 11" coil will pick it up better than the smaller coils. The 11" coil is a bigger antenna. I have found that sometimes it will go somewhat quiet when swinging over the ground but when I stop it will start to chatter, but I am running a F75.
Most that I have read about the F70 and 11" has been positive, I would take it to another location more out of the city area and give it another try, before giving up on it.
If you have to make a lot adjustments detuning the detector for the 11" coil you will lose so much depth that you may as well change to a smaller coil.
Give it a chance,
Ron in WV
Most that I have read about the F70 and 11" has been positive, I would take it to another location more out of the city area and give it another try, before giving up on it.
If you have to make a lot adjustments detuning the detector for the 11" coil you will lose so much depth that you may as well change to a smaller coil.
Give it a chance,
Ron in WV
------------------IB
Welcome Cole and thank you. Don't want to take over the post from A1 but been thinking about this for sometime. You mention chain link fence. Did you ever try to ground balance on the fence? I have no idea what the fence frequency/number is but if you got rid of fence noise everything else would be target noise? Anybody try this? Don't know if this will work but I will try it soon. Thanks.....Z
Even out of the city, some cellphones will drive some metal detectors nuts, whereas the same cellphone in the city may not present much problem because the phone is throttling back the transmit power being closer to the cell antennas. So-- whenever you're experiencing suspected electrical interference, step one is turn your cellphone OFF (not just standby).
Out in the middle of nowhere I've seen my cellphone interfere with the Tek G2, which many regard as virtually immune to electrical interference. Had to turn the cellphone off. Same machine in the factory office surrounded by cellphones, computers, and flourescent lights runs wide open no problem.
Out in the middle of nowhere I've seen my cellphone interfere with the Tek G2, which many regard as virtually immune to electrical interference. Had to turn the cellphone off. Same machine in the factory office surrounded by cellphones, computers, and flourescent lights runs wide open no problem.
Mark in NC
Member
Bigger coil = bigger antenna to pick up stuff...good and bad! The F70 is the under-estimated butt kicker in the Fisher lineup. When you can run that 11" DD and turn up the heat, expect deeeep coins! Mine found me one of the deepest silver quarters I've ever dug.
REVIER
Well-known member
I think this big DD is one amazing coil.
Pop tops used to be a huge problem for me but I have learned techniques that took care of that quickly, efficiently and easily when using DD's mounted on the F70.
I have experience using it on my F70 in both great and horrible soil and it seems to work well in both...with the right settings.
In great soil I have never dug targets so deep in my life using this coil...easily in the 8-12" area but even a few further than that up to the 15" mark with some decent screen ID information too.
In good soil, even with huge EMI chatter I get with the power turned up, once you get used to the noise and jumping it always seems to stop and tell you when you are swinging over real targets. I found a gold ring nestled in between two pieces of iron at a site with the most severe EMI I have ever encountered once. It takes patience and practice to understand and notice the cues, plus some slow movements of the coil, but I have found too many good targets under these types of difficult conditions to call it luck.
By turning the sense down to 30 in that good soil I have waded into sites so trashy that I was even crazy to attempt it but somehow lowering the sense that much still gets amazingly deep and seems to hone that scanning field down to something similar to a precise scalpel with laser-like precision. I have plucked out many nice pieces of jewelry and a few silver coins in some extremely trashy sites this way while avoiding most trash.
In the bad soil I hunt in now I have found I do get a bit deeper using this big coil over the standard elliptical and sniper but because all the local sites I have used it at seem to be built on old landfills or areas filled in with landfill and iron slag from local foundries the sniper coil gives me better and more stable ID's at deeper levels especially in the predominantly trashy sites I usually hunt.
As I venture out to more normal sites with less iron under the soil I will mount this coil back on and see how it handles areas with just the red dirt mineralization problems we all need to deal with here in the south. I bet I can find some good settings and more stable behavior at depth under those conditions in some less trash filled and more wide open sites or hope to, anyway.
Use this coil at the right sites with the correct settings and the sky is the limit as far as I can tell.
As far as noise I have gotten used to it but I have found that certain tone choices in noisy areas can be mentally fatigueing and will eventually drive you crazy.
My normal shallow coin and jewelry hunting 4H tone selection and my recent experimentation experience using DP works great in low noise and low power settings but when going deeper or at sites with jumpy EMI problems I found that listening closely, watching the screen and using one of the lowest three tone choices, 1, 1F or 2F makes me notice more better targets as they pass under the coil and keeps me sane.
Dave J. once gave some advice to a hunter that was having a difficult time dealing with EMI and chatter at all power levels to switch to mono tone.
I figure there had to be a scientific reason for this suggestion and in sites with bad problems like that this is what I do and I have found some great targets using that tone option because it does seem to be the quietest choice under those conditions.
Pop tops used to be a huge problem for me but I have learned techniques that took care of that quickly, efficiently and easily when using DD's mounted on the F70.
I have experience using it on my F70 in both great and horrible soil and it seems to work well in both...with the right settings.
In great soil I have never dug targets so deep in my life using this coil...easily in the 8-12" area but even a few further than that up to the 15" mark with some decent screen ID information too.
In good soil, even with huge EMI chatter I get with the power turned up, once you get used to the noise and jumping it always seems to stop and tell you when you are swinging over real targets. I found a gold ring nestled in between two pieces of iron at a site with the most severe EMI I have ever encountered once. It takes patience and practice to understand and notice the cues, plus some slow movements of the coil, but I have found too many good targets under these types of difficult conditions to call it luck.
By turning the sense down to 30 in that good soil I have waded into sites so trashy that I was even crazy to attempt it but somehow lowering the sense that much still gets amazingly deep and seems to hone that scanning field down to something similar to a precise scalpel with laser-like precision. I have plucked out many nice pieces of jewelry and a few silver coins in some extremely trashy sites this way while avoiding most trash.
In the bad soil I hunt in now I have found I do get a bit deeper using this big coil over the standard elliptical and sniper but because all the local sites I have used it at seem to be built on old landfills or areas filled in with landfill and iron slag from local foundries the sniper coil gives me better and more stable ID's at deeper levels especially in the predominantly trashy sites I usually hunt.
As I venture out to more normal sites with less iron under the soil I will mount this coil back on and see how it handles areas with just the red dirt mineralization problems we all need to deal with here in the south. I bet I can find some good settings and more stable behavior at depth under those conditions in some less trash filled and more wide open sites or hope to, anyway.
Use this coil at the right sites with the correct settings and the sky is the limit as far as I can tell.
As far as noise I have gotten used to it but I have found that certain tone choices in noisy areas can be mentally fatigueing and will eventually drive you crazy.
My normal shallow coin and jewelry hunting 4H tone selection and my recent experimentation experience using DP works great in low noise and low power settings but when going deeper or at sites with jumpy EMI problems I found that listening closely, watching the screen and using one of the lowest three tone choices, 1, 1F or 2F makes me notice more better targets as they pass under the coil and keeps me sane.
Dave J. once gave some advice to a hunter that was having a difficult time dealing with EMI and chatter at all power levels to switch to mono tone.
I figure there had to be a scientific reason for this suggestion and in sites with bad problems like that this is what I do and I have found some great targets using that tone option because it does seem to be the quietest choice under those conditions.
Mark in NC
Member
It was between 11 and 12 inches. In my soils, that's really deep. It was also in a location I had walked over many times with various machines. The 11" DD and F70 had it singing out, loud and clear!
Stanislav M
New member
My Fisher with 11 DD - SEN 90 (very much rubbish, 70-82 ) Thres -1
Very good work but slightly noise
Very good work but slightly noise
still looking 52
Well-known member
If you are going to use just one coil it has to be 11" DD. With all the benefits it has it can't be beat. This coil will go deep and cover a lot of ground plus it's very easy to pinpoint with and trash separation is also excellent for a coil that big.
REVIER
Well-known member
jimmy24us said:
I have posted this rimming trick all over the place and have been thanked repeatedly for doing it because it works.
As I said before I have 3 coils and every one is a joy to use.
The concentric works great in all sorts of sites but in the ones infested with pop tops it shines.
Be that as it may I tend to use my DD's more often so it is important to avoid frustration wading into a sea of these things in trashy areas when you have a DD on the end of your stick and you are too lazy to change over to a concentric...which I am.
Almost two years exploring the deep technology and almost unlimited settings so far in my anal way of experimentation and I have barely scratched the surface of what the F70 is capable of achieving.
I really believe that.
Out of everything I have learned lessons filed away regarding two specific things I consider most important...how to successfully hunt in iron and dealing with pop tops using DD's.
Below is that pop top technique copy and pasted from another post...
I have the 10" standard concentric, the big 11" DD F75 and the 5" DD for my F70 and I use and love all 3 types.
The 11" gets scary deep, the concentric is great under most circumstances and does deal with the bottle cap problem easily, the 5" is surprisingly deep and my choice in heavy trash and iron infested sites.
All 3 have found me mucho coins both old and new and tons of silver plus many gold targets.
I use the DD's more than the concentric and hunt public parks loaded with pop tops and use a technique that makes those pop tops a total non issue.
If you try this you will find you can efficiently and easily eliminate 95% or a bit more of these hated things and make hunting trashy sites with DD's, (if you choose to do this for whatever reason), just as frustration free as when you use concentrics.
This technique is called rimming and trust me it works on most shallower tops at 6" or less in depth.
I have dug hundreds and hundreds of pop tops experimenting to make sure it works and now I confidently dig very few.
When you come across a high tone, high number coin like signal that is actually a pop top just make some quick side to side movements over the target as you pull back the coil.
When the front rim gets over the target and moves just a hair past the numbers will drop.
They might drop to the 40's or 30's, sometimes they will drop all the way down to iron but there will be a drop.
Coins never do this, most pop tops will.
Very flat, rusted older style caps laying flat in the soil will still act like coins and won't usually drop and there are some of these out there but really not all that many, most others will drop to lower areas.
Using low disc you can see this drops easily, using high disc, I have done a few hunts recently with disc set at 50, I have found I still get high tones and high numbers and can't see the drop but they don't repeat so I can still tell but I usually prefer using lower disc to see the drop.
Using this technique has turned hunting in my trashed out public parks using DD coils from a nightmare into a pleasure.
still looking 52
Well-known member
Revier: thanks for that tip on rimming. I'm definitely going to give that a try on my next hunt, I've been digging to many bottle caps. This one area in our park is so infested with bottle caps that we pretty much just gave up on hunting it , it's right along the curb where everybody parks there car and just throws everything out the window. We know there is silver in there but we can't get through all the trash to find the silver. I'll talked to my brother(wv62) and get a plan on how to use this rimming technique.
REVIER
Well-known member
still looking 52 said:
You guys use low disc so it should work well and knock most of them out if you look for the drop as the front rim moves over these things.
Sometimes the drop is from the dime/quarter area to the 30-40 or sometimes low 50's, I see more drops to iron just below 10.
Whatever, coins don't drop like this, neither will really rusted flattened old style tops laying flat but all other crowned pop tops should.
I just recently hunted an infested site with high disc from 50-65 and no way to notice a drop like that but in that case just look for solid repeatable high tones and numbers.
Using these settings pop tops won't repeat so you can tell.
There are techniques you can use on my Tesoros that will give you a clue about these using DD coils but they take too long so I end up digging them.
Using screen units are way more efficient, or when I do use my Compadre or the Vaq I make sure I have a concentric mounted on the Vaq or it just ain't no fun.
The pic below is from the very first time I hunted the park with a big DD coil on my Vaquero that I hang out at the most right now.
Those were in my dig it all days, I have no patience or energy to go on these kind of garbage digging hunts nowadays.
When I say I hunt trashy garbage filled parks I mean it.
Nowadays using my F70 with any coil or any Tesoro with a concentric coil this amount of garbage is no longer a great concern.
Like they used to say on tv...
"The More You Know..."