Small coils have extremely good depth and sensitivity despite what popular belief would tell you. If you regularly search areas that you know contain valuable old coins and lots of iron and rubbish then you owe it to yourself to get a small coil.
Why should I do that? The reason is simple really:
• Small coils will see coins and artefacts better and easier than a bigger coil that might blank them out due to trash items nearby.
• The pin pointing can be fantastic and you will soon develop little “tips & tricks”.
• The separation between good and bad items can be fantastic.
• Interference in the form of EMI from pylons can also be minimized, because the Rx winding is much smaller so is therefore less prone to picking it up making it easier then to hear the real signals rather than “stray falses”.
As an example, the small 6 inch Double-D coils on the X-TERRA is uncanny…simply amazing performance! This is especially good for gold prospecting with the X-TERRA 70 and 705 models. They see ‘less of the ground’ and more of the target.
However, the beauty of small coils is, one can almost get away with using full sensitivity if one wants to, but it could get a bit ‘blippy’. Backing down to a happy medium still gets decent depths. However, the usable sensitivity issue is important, because small coils are less affected by ground minerals and the proximity of junk and ferrous items. So where the sensitivity on a larger coil would have to be reduced to not pick up on this junk, the small coil’s sensitivity could be “opened up” as the narrow area of detection is less affected by these “stray beeps” one gets from junk items overwhelming larger coils!
In public parks around trees with bulging roots and for small jewellery recoveries this coil will work very well and scrubbing along the surface is recommended to achieve maximum detection depths. Similarly, on farms between plough rows these coils are very effective as it’s easy to zip along the sides of the furrows. Woodland is another area where small coils offer great potential as its small size gets in much closer to tree trunks. Small coils have a sharper detection point than most other coils so you will find coins, even some ridiculously easy targets missed previously by other detectors. It’s not just depth here that counts – it’s getting coin hits in amongst high trash – they do that extremely well.
So why not look into getting one of these for your coin shooting arsenal! You’ll be glad you did.
Good Hunting
Des Dunne
Comments
H
I'm delighted you're enjoying your new E-TRAC metal detector.
For FE and CO numbers on gold rings it's difficult to say precisely what numbers you may get?
This because there are so many designs and styles of gold rings, carat types, combinations of precious metals in rings, the depth, angle and time a ring has been in the ground and the type of soil the ring is in will all have an impact on how and in what way the ring will signal it's presence to your coil?
I'd say that the carat of the ring and mineralisation levels of the soils in your area will be the most important factors that you would have to consider: depth too of course because the deeper the target the 'less reliable' the numeric readings...meter ID systems are the same no matter the type of detector...mineralisation levels will alter readings especially at depth beyond seven or eight inches.
But, I have done a test for you!
I've taken a selection of gold rings from my finds and placed them two inches deep in moderately mineralised soil.
Note, E-TRAC's Auto Sensitivity wouldn't rise beyond 16.
A large 2-gold content "Butler High School 1925 class ring" registered FE 12 CO 21
A small 9ct gold engagement ring registered FE 12 CO 04
A mens 9ct sygnet gold ring registered FE 12 CO 05
A medium size gold plated ring registered FE 12 CO 37
I hope ths helps Bob!
Des Dunne