This coil has recently touched down in Australia.
http://phasetechnical.com.au/product/detech-15-super-deep-mono-coil/
Detech have labelled it as being a Spiral Plus winding, but what the changes actually are, I'm not exactly sure.
I did a bit of testing with it up at Mt. Crawford, mainly on buried targets and some air tests and I was most impressed.
It seemed every bit as sensitive as the 14" Ultra, but had more punch on bigger targets.
The two times I had it out the weather was really terrible. First trip was freezing cold, rain, and I actually got hail in my jacket pocket as I was running back to the ute.
So I gave it a quick run across the saturated ground, and it was very stable. Ticking all the boxes so far! Second trip was really really windy and EMI was up, so I pulled the old 4500 out (forcing me to run in Enhance), and it was very stable. I detected for a short while and dug a nice variety of targets, from tiny lead fragments to large bullets at very good depth. The clarity of signals even on the faintest responses was the real standout feature. Just had to get it across some gold...
I then took it across and used it on my way to and from the Laanecoorie Bash. I pulled into a spot around 3:30pm, so only had a few hours. I first went over the same few mullocks heaps where I pulled 5 bits with the 5000 and 12" Evo on a previous trip. No joy. So I just started circling around the adjacent ground. Ended up with 4 bits for 1.19g, smallest was 0.1g, and nearly a perfect ball.
Sunday headed for home, I was in two minds where to go, but decided to return to the same spot for a better look. I parked the car in a different location, and noticed some overgrown heaps right next to the road. Decided to grab the 2300 for a run, and pinged two bits in short time, then after 8 bits of lead, it was back to the car to grab the 45 and 15" detech. I walked in from a different angle and for the life of me couldn't find the same area I was working. I then came across a spot I was familiar with as I had found some gold with the SDC there a couple years ago. I'd put everything across that spot and couldn't get anything else. It was very loose river wash, so I always thought there had to be something out of range for the SDC there. I got a very faint blip in the threshold, and after scraping off a bit of ground it became a signal. Out popped this one. After digging tiny stuff, a piece like this feels like a 3grammer haha, but it was only 0.77g.
I then went for a while not digging much and again on the edge of an old timers hole got a very faint signal (probably would have missed this without the sP01 enhancer). In a little ball of clay out popped a flat 0.17g bit.
Then targets became scarce. It was getting warmer and I needed a drink top-up. I was in two minds whether to go home or grab the SDC for another half hour. I ended up just walking/swinging very slowly back to the car. I swing across the base of a tree over an accumulation of leaf/bark mulch, and got a little dipping signal. It was the nice deeper one I was hoping for. I am so used to digging scrappy reefy bits from the hills, when I dig a nice flat clean piece like this it feels like a 4 grammer! But at 1.68g I'm still a happy camper.
The final tally of 7 bits for the 15" Detech, teamed up with the old faithful 4500 and SteelPhase enhancer.
Great coil. Can't wait to see what it'll do in Fine Gold on the 5000
