dont be afraid of losing depth with a smaller coil

[Furious T]

I was hunting a site which Ihave only been to a few times, but it has been hunted fiercely by others. The first time I went there I used the 10x5 DD coil and found 13 coins and a small 9 K gold ring. Since then I changed my coil to the 6" concentric and have found a further 63 coins (no more gold), two of the coins dating back to 1952 and 1953, one copper and the other silver. Some of these coins were found and good depth (over 3") and I was using sensitivity of 8 and 9 on the X-Terra 70. There are loads of bottle caps and pulltabs in this area, but by going slowly I'm still getting good depth, and isolating good targets. I did find another ring and a couple of earrings (not matching), but they were junk. H.H. Sapper

 

[David]

"I was using sensitivity of 8 and 9 on the X-Terra 70."

Sapper, is that a misprint or do you use sensitvity that low?? with good results with the 6" MF Concentric in high trash areas? They tell me that the 6" HF DD is the way to go in high trash areas as it has fine knife blade separation, very narrow detection pattern, being better than the much wider width knife blade detection pattern on the 5x10 HF DD and cone shape on the 6" MF Concentric. Also being a HF still handles iron trash very well.

The 6" HF DD was partly designed for prospecting to find the very smallest of gold nuggets and the finest of gold specimens with that narrow blade detection pattern thus has a secondary use application of the best target separation in coin and jewelry hunting. It may also seem like a very long time to cover a small amount of ground with such a small coil.

 

[Goes4ever]

wow why such a low sensitivity? when I use my 6" coil I crank that sensitivity up to 25-27 and can get some good depth of 6-7"

 

[Furious T]

No, it's not a misprint...the reasoning behind using such a low sensitivity is to get between the trash without the signal "spreading" either side of the coil..I find I get better definition.. the older coins I mentioned have been out of circulation in Aust. since 1966-1967. The copper penny, a large coin by any definition was between 4"-5", but the signal was quite strong. The silver coin is about the size of your quarter and it was about 3" - 4" and again gave a good signal and a stable reading (34). Both coins were in areas which held lots of pulltabs, ring pulls and screw caps, the screw caps giving readings between 28 - 36, depending how misshapen they are. In another completely different area, about 3 months ago, I found 18 pennies and halfpennies together. Now I know I had detected the target before, but with a larger coil and higher sensitivity it read as one large target. It was under a railway viaduct and I assumed (many times over the years) that it was a large piece of rusted iron fron the bridge. The smaller coil with lower sensitivity gave me much better definition and prompted me to investigate..boy, was I surprised when I kept finding the coins, in a patch as big as an 8" coil and about 6" deep (some were slightly deeper). I dont always detect with sensitivity that low, but now, in old parks and trashy areas, I keep it lower than I used to. Try it, see if it works for you.. HH Sapper.