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F75/70 "little coil" question. Which is better?:bouncy:

S

shadowulf

New member
I'm looking at improving my coil-quiver with a small trash/nugget coil. I know there are some huge fans of the 5"DD and have seen finds for the 6.5 conc "football".

So, what are the pros/cons of each?

Has anyone compared them both, owned both, or been in the same room with both?

Just the facts please.


TIA,
'wulf
 
I have them both. Got the 6 1/2 concentric when they first came out and used it with a regular F 75. When the LTD came out I got the two coil package which included the 5" DD.

The 6 1/2 concentric, of course, likes bottle caps far less then the 5" DD. I woods hunt a lot in the winter and I use the 6 1/2" for some of that kind of hunting. I can poke and slip it into and under places I can't the 11" and gets a little more coverage then the 5."

For hunting in heavy trash and iron, the 5" is a real killer. It can snarf a dime on edge right next to a nail or tab with slow and careful just inching along hunting. I never compared the two side by side for depth, but I always felt the 5" was some deeper.

If limited to one, it would be the 5" for my typical hunting. The DD takes mineralized ground better, too. HH jim tn
 
I agree with Jim,the 5" coil works well in the woods and other tight spots,and doesn't seem to sacrifice depth either.The 11" is like a vacuum sweeper in open fields.Another plus with the 5" I have noticed it seems to handle emi a lot better then the 11".can't comment on the 6.5" as I don't have one.Hope this helps...hh rick in mi
 
Input is input. I just found it strange that the "typical" shape for a DD is a concentric and visa-versa. And being I want to try nugget hunting with my F70, I will need a small coil, and a medium sized coil too. I'm hoping the 10x5 DD will be out by the time I feel that need.

Is the 5" DD that "sharp" when it comes to seperation? I thought it might be a little closer between the two due to their size.
 
shadowulf said:
Input is input. I just found it strange that the "typical" shape for a DD is a concentric and visa-versa. And being I want to try nugget hunting with my F70, I will need a small coil, and a medium sized coil too. I'm hoping the 10x5 DD will be out by the time I feel that need.

Is the 5" DD that "sharp" when it comes to seperation? I thought it might be a little closer between the two due to their size.
Click to expand...

I have the 5" DD coil and only limited hunting time with it but I did take it to one of my very trashy park sites and used it to hunt around a picnic pavilion.
At this site the trash is heavy with foil, pop tops and tabs of all kinds and pieces of tabs very close...lots of it in close proximity at an inch or less relative to each other.
All I can say is this thing worked great, separation was superb and I could almost get a clear picture in my head of exactly what was down there.
I did not remember this coil acting like the big 11" dd coil over some pop tops where if you "rim" the edge of the coil over these the signal will drop down into iron so you can tell, but this was over a month ago, it was a quick hunt, my first time using this small coil, and it might have done this but I wasn't looking specifically for this behavior at the time.
What I do know is at this trashy site that I had hit several times before and cleaned up pretty good I didn't dig much trash at all, dug only the solid repeating signals and still plucked out a few coins I missed on previous visits.

I also walked over to a more open area away from that pavilion with less trash and got a few pretty deep signals from 8-10" and they were tabs every time but depth does not seem to be a problem at all with this little powerhouse of a coil.

Super trashy picnic pavilions, basketball and volleyball courts are my favorite places to hunt looking for jewelry and I can see that this is going to be my main weapon this year at any new sites like these I come across, for sure, but I am looking forward to returning to lots of my old sites where I did find silver and gold cleaning up the area with my F2 and sniper except at a few of the real old ones I might just be able to find some deeper targets with the F70 and this coil that that I couldn't get close to using the F2.
 
Here is picture of a coil comparison I did for gold jewelry using a F75Ltd.

Ron in WV
 
That chart reflects my thoughts on the coils and size. The elliptical 3.5x6.5 detection pattern would seem to be close to a "sloppy" DD pattern.

I'm still debating the 2 coils. The 5" will surely hit small gold and DD are usually better in highly mineralized soil. The 6.5 will have a little beter time getting around objects and plants.
 
One last question, how does the 6.5x4 work in high iron/mineralized soil?

Sounds like the 5" has the highest number of recommends. But WV62's chart shows the 6.5 a little betteron small jewelery.

Decisions, decisions.
 
I can't say for sure why the 5" is favored by most over the little elliptical, but I would say it is depth on what it can see. If I was just looking for coins the 5" will go deeper than the elliptical. Now what I was testing the coils for was best for gold jewelry and the smallest gold that I could find in my wife's jewelry box.

So if you notice the 5" could not see all the gold targets, so if it can't see it you for sure are not going to find it. For me if I plan on hunting jewelry I would put on the little 6.5" and if I was hunting coins I would go for the 5".

But just a little story about the 6.5". I was jewelry hunting in a park that has stopped giving up the older coins, and I got a buffalo nickel and an Indian Head penny in the same day. Both coins were no more than 4" deep, was it just luck or that little coil?

Ron in WV
 
Its that "run with what you know" thing that hangs me up. In high mineralized soil, you need a DD coil. Yet, I have seen people do well with a conc in HM soil.

I will just have to find out myself, I guess.
 
I can't say much about the soil our soil is kind on the mild side and I can hunt either type of coil with very little problems. The DD would most likely be the safe way to go.

Ron in WV
 
I can say from experience that an elliptical coil will always outshine a round coil when it comes to chains without charms attached. It is the link makeup that causes this. Rings are a different matter due to bulk and that changes if the ring has been cut and doesn't complete the circle.
 
Sorry at the time I was testing I wasn't really looking for a depth number, just if I could get a siginal or not.

That F75Ltd and all its coils was sold, but I have a std f75 now and a little elliptical on the way, maybe I could get you some numbers.

Ron in WV
 
The gold chain measurement is what keeps the 6.5 in the running.
I'm still looking for a medium sized DD coil, but I know hhiw handy a small coil can be. As long as the 6.5 doesent blank/overload in nugget country, I'll try and use it. No one from the pro 5" has given any real info on nugget hunting or small chains. So I'm leaning more to the 6.5 "football".

But I am interested in what WV62 finds with his coil when it arrives.
 
Hey Shadowulf...a few years back I contacted Ralph over at Sunray...he makes those inline probes and is a sponsor of this site...I asked if he could make me a switch for my F70 with two coil jacks on it...the idea at the time was to run the main 11"dd coil through one socket, and a 5" or other coil through the other on its own separate rod...that way, all a fellow had to do was throw the switch to go live with one coil or the other...my thought process was to be sweeping merrily along with the 11", keeping the little 5" on its own straight shaft tucked through my belt loop out of the way like a sword or something, then, if I got into some heavy trash or a situation that warrented it, I could flip the switch, have the 11" go dead, and sort of use the 5 as something to check around with instead of an inline probe, it would be the little coil...see?

Anyway, he said no problem, and quoted me @ 100 bucks for the switch assembly...I just never pulled the trigger on this idea..I believe it has merit, and if I get the chance I might just go ahead and order up this Spring...it sure would be a good way to field check two coils without having to change out from one to the other all the time on a signal too...whatcha think?
Mud
 
It has merit. But with an extra shaft/coil setup, how long does it really take to change coils? 2-3 minutes? I see the switch being necessary for the invader pinpointer probe. But going from a sweeper to a trash coil? Might just go ahead and switch out and eliminate a potential problem. Now, if you make a second shaft setup as to use with your open hand. Like a jungle gym probe that can pick around the steel footings. That might be handy and needing the sunray switch.
 
That was the original idea...totlotting...sweeping the mains with the big coil, dropping in tight with the 5...I actually was just gonna use a 4" piece of pvc for the rod, or maybe a long lower rod assembly, so I could change coils quick on the main shaft without unscrewing a cable jack..tuck the unused coil/rod someplace out of the way you know..
Mud.
 
In all honesty every coil has it's plus and minus factors........

A lot of times it comes down to how you like the response of each coil... Not all respond the same way in all dirt situations or locations either..

For example I found the little 4x6 football concentric went a little deeper in my dirt over the 5" dd..But the 5" dd separated good targets from bad better.. also saw more targets per sweep at depth than the football coil did .
The football went down in a cone shape detection area..DD went the full 5" across the coil to it's max depth. At the tip of the football I hit about an inch deeper when I went over the target.. at about 1/2" detection area at the point of the cone signal I suspect.
 
I love the football coil for pinpointing. It is my go to clad hunting coil. I can turn it up on end and shove it down into the hole. Great pinpointer and still seems to go deep. I use it more than I use the 5 but people do say the DD does separate better. Let us know what you decide.

Don
HH
 
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