Coil choise.

What would be a good coil for deep small target with better pin pointing, ive got a NF 17 x 10in mono, should i go smaller in coil size?

JeffH.

I've got a mate with a 2100 had it since new, mainly uses commander 11 dd and coiltek 14 dd has no problems pin pointing nuggets and both seem to have good depth relative to size.

G.B.

JeffH, if you're using monos as you've stated, then you pretty lucky as monos are sensitive across the board. You will pick up a .35gm target even with an 18" but it will boom in alot louder with a smaller coil. You've stated that you want to find "deep small" targets so in order to get depth, you need to use a larger coil but not too large that it's not as sensitive to the smaller targets. It really depends on the depth in the area that you're detecting. Maybe you need to dig a hole and check the depth.
The 17x10 is a good alrounder but then again the 11"Minelab is great too. Maybe going to a 14" round might give you a little extra depth without sacraficing too much sensitivity. That's probably the step up I would take first but as I mentioned earlier, it all depends on the depth of the area you are detecting. Sometimes, you just wont hear those small targets at depth, no matter what coil you are using....
Cheers

The main problem is as the hole gets deeper the coil wont fit in the hole and as you said its super sensitive, even if i bump a rock or stick it goes off.

Make the hole wider

G'day JeffH.

Frankly,I'm quite surprised you haven't complained about ground noise when using monos on your SD2200.Anyway,not to stray away from your main question,the current NF 14x9 elliptical mono(CPA Series) will go deeper on the sub gramers,(bellow the 1gram mark),than its bigger brother the 17x11 mono.
As for my recommendation,the 14 inch DD Coiltek Elite Pro,both for sensitivity and depth,not only on the sub gramers but multy-gramers as well.

Cheers kon61.

Hi Jeff
I have not used the 17" x 11" coil but from what I have read it has good sensitivity & decent ground coverage, plus the shape of the coil makes pin pointing a breeze in saying that you still need to have the basics of pin pointing nailed no matter what coil you use example I find pinpointing with a 20" easy yet some struggle with an 11", being new to this game I would suggest that you try to contact somone in your area from this forum who is experienced so that they can help you with a number of the finer points of detecting, better still if there is some sort of test bed near you that would be great??
cheers
Lee

I was thinking of making a poly pipe setup in the back yard to test it on.

JeffH wrote:The main problem is as the hole gets deeper the coil wont fit in the hole and as you said its super sensitive, even if i bump a rock or stick it goes off.

Hi Jeff,

How old is the coil? Have you made sure that the coil plug is tight? Does the coil sound off when you wriggle the lead where it goes into the housing?
If it is sounding off when bumping sticks, if it is not still under warranty, I would be getting a new one. Nothing worse than a coil that falses when bumped It will do your head in!

Cheers Mick

On my 2100 I use the NF 14 round , picks up the sub gram at 8 inches and got a 10 gram at 500 mm . Also used the 17 x 12 but it doesn't have the depth or sensitivity of the 14 round. Also I use the finders superfix , the difference with or without is huge .
Goldpick

Goldpick wrote:On my 2100 I use the NF 14 round , picks up the sub gram at 8 inches and got a 10 gram at 500 mm . Also used the 17 x 12 but it doesn't have the depth or sensitivity of the 14 round. Also I use the finders superfix , the difference with or without is huge .
Goldpick

that's 17 x 11 not 12 and both mono

Goldpick, I'm interested that you use the superfix. I bought one some time ago and tried it for about 2 hours. I just wasn't happy with it or the sound it was making or the way it performed. Maybe I'll try it again somtime. Have you compared the detector response on a target with and without the superfix where you have picked up a target using the superfix but couldn't hear it without the superfix attached?
Cheers

Mechanic wrote:

JeffH wrote:The main problem is as the hole gets deeper the coil wont fit in the hole and as you said its super sensitive, even if i bump a rock or stick it goes off.

Hi Jeff,

How old is the coil? Have you made sure that the coil plug is tight? Does the coil sound off when you wriggle the lead where it goes into the housing?
If it is sounding off when bumping sticks, if it is not still under warranty, I would be getting a new one. Nothing worse than a coil that falses when bumped It will do your head in!

Cheers Mick

The coil came with the detector, apperently its not very old and looks in top condition, i dont know if the leads creat a noise when moved, something ill have to try when i get it out, im running a Detac enhancer and super regulator so i find even the smallest bit of metal even at 5-6 in sounds off quite loudly.

Costasdee. Yea I compared with and with out superfix. With the superfix I find it much easier to hear small and large targets Deep , it works great on mono coils , we have a test patch 70 mtrs from a major powerline , in bad ground and with superfix I can easily pick up a 14 gram target at 650 mm . With out there is no way I would dig the target ( very hard to here signal if at all ) we tested a 8 inch mono , 14 mono , 17x11 mono , 11dd , 18 round dd and a large eptical dd . Of all these the 14 round was best by far with the dd coils coming in dead last. The 8 inch mono was good to 200 mm on sub gram but that's the best it could do. Even running the superfix in minelab mode is a huge improvement than without it.
Goldpick

Hey Goldpick
I see you are in Townsville! this test patch you mention, is it on a secret spot? Would it be possible to do some testing of my SD2200 there? I can fully understand if not, but it can't hurt to ask.
cheers
Lee

Well there you go, rang the NF manufacture this morning, appartently my coil has problems and they will replace it at no cost, very help-full people.

You just cant complain about that service.... good onya NF!!