Treasure Talk< Back
Cutting it fine with small coils
Everyone that detects parks, ovals and old sites for coins and relics know that sometimes it is almost impossible to detect where there is a multitude of bad targets in the ground. These trashy areas will wreak havoc when using larger coils as they can mask the good targets often found in close proximity to rusty iron, pull tabs etc. Most of the time I use the 11-inch Double-D stock Minelab coil with my E-TRAC, but recently I have been challenged by a couple of friends to give a smaller coil a run and see if it is better in these situations. My weapon of choice was the 8-inch FBS 800 coil from Minelab and for it to be a fair test it would have to be in an area that had really been given a thorough going over with the 11-inch coil while using the same settings. There is an old blacksmith shop that would be perfect, because one side of the house is extremely trashy but I still managed to pull some good targets out with the bigger coil.
I was reasonably confident that I wouldn’t have missed much, if anything, knowing that I had been over the spot quite a few times going low and slow. This type of detecting needs extreme concentration as you have to really shut everything out and tune in to every little response that potentially could be a good target masked by rusty iron.
I had chosen to operate with an open screen, only discriminating out the lower 5mm of the screen where iron targets are obvious. You can also discriminate out the top of the screen from 1:1 to 1:39 which will reduce some noise from the halo created by rusty objects. Now it is a case of going really slow and listening for familiar tones of good targets as you move past the rubbish. It didn’t take long for me to realize that there was something very different about using the 8-inch FBS 800 coil, it was like a fine blade moving between the targets with precise accuracy. I was surprised when the good targets started to stand out leaving me wondering how I had missed something so obvious, so I started to take notice of what was around the target and how far away. It was apparent after a while that every target had rubbish outside of the 8-inch coils reach that would have been picked up by the larger coil causing possible masking.
Old Sites & Parks
This small 8-inch coil has proven its worth to me in the trashy areas of ovals, parks and old sites after only a few hunts. It has awesome capability in discerning between the ferrous and non ferrous targets with ease, as for depth there were a couple of targets retrieved at around 6 inches and I am confident that it will go deeper. I finished up with two Britannia pennies an 1890 and 1891, an old thumb bob, a musket ball, some other relics and a very high opinion of the small 8-inch FBS 800 coil that will always be close on hand. So think of all the places that you could go back over where you may just have happened to miss a choice coin or relic, I don’t know about you, but I now have year’s worth of quality places that are now detectable.
I'm wondering, in sites that are so full of ferrous, do you always run Fast Recovery ON, and Trash Density HIGH?
And these coins seem to be fairly shallow, so I'm guessing you could run your Sensitivity quite low and still see the coins?
And finally, leave some coins for me! :-)