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Just Purchased the 6" DD High Frequency Coil (Pics + Test)

nero_design

New member
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Okay, I did it. Today, after reading the posts here on the forum and contemplating the suggestions and advice given, I went out and picked up the DD 6" HF coil for the X-Terra 70 as well as one of those wacky new gold pans everyone is talking about.

First thing I have to report is what other owners have noticed - that the new 6" coil is incredibly sensitive... I almost expected a larger coil to be more sensitive but this little coil is designed for the tighter places in a creek or stream. My biggest problem was finding a small enough nugget to test it with... and this is about the smallest I had... just 0.02 gram in weight.

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To show you just how small a target this is, I've photographed this mini 'nugget' both on the scales to confirm weight and then next to a 2 gram nugget to show the scale difference. The camera makes them look a lot bigger but next to the two grammer, this tiny little 0.02 gram 'micro-nugget' gave me a far clearer signal than I expected. I expect this 6" coil should allow me to find quarter-gram nuggets or larger wedged under light gravel, in cracks in the bedrock or under stones.
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As noted by others, Prospector Mode is much more sensitive to the presence of nuggets than Relic/Coin-Mode when using this coil. The mini nugget triggered a 4 & 6 on the Target ID with Stabilizer ON. I was also able to pick up on some fine gold particles in a sample I have which were probably .1 of a gram. But that sort of thing I can find panning. I was impressed that it was able to detect a 0.02g nugget - or should that be micro-nugget? It's a fairly clear signal and even the targeting mode can pinpoint it. Bear in mind that these were 'air-tests'... but I'm willing to bet that in a shallow creek, this coil gives me a great opportunity to find small gold (or larger) which would have eluded detectorists in similar locations using traditional techniques with typical unsealed ground coils.

I also obtained a $30 stainless steel Yabbie (bait) pump and bought some PVC plumbing accessories from the hardware store to make a gold sucker or 'crevice sucker' out of it. I made two different tube endings for it to allow me to suck up coarse gravel as well as get into tighter cracks and crevices. I tried scraping the cracks with my knife but couldn't get the particles to land in my pan. I even tried my spoon with not much luck. I wished I'd bought something like the Bait Pump with me at the time.

I'll leave for a field test in about two days when my friend gets free time. The creek I'll be prospecting in showed me a half dozen strong particles of fine gold in just one pan last week before I had to leave. I'll spend a day following the creek and sampling the bedrock where possible. I'll get a chance to test this unusual looking gold pan too... now that alone should be interesting They're on eBay now ('Gold Rush Pro Series Pan') for around $20 at the moment as well. But why did they have to make it bright Blue? I thought Black & Green were better for identifying gold particles.
 
n/t
 
Here you go... a short video I made today after three prospectors looked at the tiny spec of Gold (as in the pictures above) I had brought to show them. They laughed when I told them I got a target response signal from it. "Too small!" they said. Other comments were a little more profane (lol!)

One had an X-Terra with the 5x10" HF DD Coil and another insisted we try it on the coil... but we had no response at all from the nugget which seemed to confirm their belief. I did mention to them there was a big difference between the two coils. So I took my speck home again and air-tested it on camera.

http://www.youtube.com/watch?v=Y0Q0A6L-5og
 
And that the X70 "appeared to be stable" as opposed to his new detector, because it wasn't "Sensitive Enough".

Last year I made a post concerning how sensitive the X70 was with the 9 inch concentric 18.75KHz in Prospecting Mode. I will say it was met with some derision as I was pointing this out on another forum in reference to a soon to be released detector. Below is a quote from my original post and a couple of photos which your video supports as my observations being accurate. Keep in mind this was NOT the elliptical or 6 inch DD HF's.

"I was finding a fair number of tough targets like open hoop earrings, toe rings, stud earrings and earring backs. Later in the day after getting a bit tired I decided to try prospecting mode after setting iron mask to 5, sensitivity to 30, and tones at 22. Once engaged it was if this beach had never been detected before. It took about 30 minutes to move ten feet because stud earrings and backs(14) were coming up one after the other. I finally got tired of it, and went back to Coins mode. I would not want to use this mode in heavy foil trash."

[attachment 78687 earbks.jpg]
[attachment 78689 general.jpg]

If I return to this same beach with the 6 inch DD in Prospecting Mode I know I had better have a bottle of Aleve in my kit, or I won't be fit to walk the mile back to my car.:lol:

HH
BarnacleBill
 
Hi BarnacleBill
That's interesting to see how fantastic your own results were. Some of those finer targets you dug would be hard to spot in salt laden wet sand with just about any detector I imagine. I have no illusions that my 0.02g nugget wouldn't likely trigger a noticeable reading if buried under 10 inches of wet sand & gravel but it shows me I'll likely spot small gold in the sizes I'm after in this creek (anything over 1/5 gram or so wedged beneath other large objects and moss).


JUST ran another air test. I noticed a LOUDER rise in pitch than even the above experiment with just a small pinch of gold particles which collectively weighed under 0.05gram. That's so small it's almost dust! And it was spread out in the plastic gem jar too... not clumped. I just tested it again and WOW!

In the post that you read, did you say the X-Terra 70 owner (who sold his X-70 after deciding it wasn't sensitive enough) later found his new replacement to be less stable than the X-70? Hmm. Do you think he should have considered a different coil for his area first? The X-70 owner I met today had a lot of experience with detectors but was having a hard time on the Goldfields using his X-70 with all the hotrocks here in Australia. I thought that was odd when I heard. He sure enjoyed the X-70 on the beach and seemed very pleased with it...but on the Goldfields, he got pretty annoyed with the device... even with an Elliptical HF coil on it. Alfter talking to him about his experienced, the first thing I discovered was that he had not read the instruction manual. (That was the same oversight that I had myself when I first got the X-70) And if you don't set the GB and Noice Cancel just right for each soil zone, you pick up the hotrocks pretty fast. That was another thing I suspected he's overlooked. Interestingly he had the Beach Setting on which I found curious. Ground Tracking might have helped although I can't be sure. He sure seemed like an pleasant and considerably experienced detectorist and it was probably his first time with the X-70 on hot soils... without glancing at the manual that is.

Took me one very frustrating adventure on hot soil to get me to sit and read the manual. Only then did I realize I wasn't setting the GB and NC correctly.
After that, it was a much more pleasant experience.

PS: I can't WAIT to try this new coil in the gold speckled creeks here!
 
because you had some nice effects and the conversion to flash came out very well with nice resolution.

HH
BarnacleBill
 
Hi Barnacle Bill

First video I've posted with the clarity I've been trying to get!
I should have shot it in daylight though for brighter images.

Camera = Canon MVX10i DV camera
Software = Edited in Apple iMovie HD (my camera's normal resolution though)
Converted to mp4 format with 'iSquint' (free software converter) to allow me to place the video on my iPod.
Uploaded same mp4 format video to YouTube.


I believe all the things I've used have Windows based counterparts. iMovie and iSquint are supposed to be available
for both Mac & Windows.

... No, I'm not a video Pro - but thanks. I used to produce visual effects in a 2D format for film and television... this is one of the few times
I've edited video as it was never necessary for me to do so at work. I've been pulling my hair out trying to get better videos onto
YouTube without any joy with the results. YouTube seems to really compress everything else I've put up. Seems I got lucky or their have
improved their video compression system.
 
I can't even get a test video up on youtube yet! I tried about 5 times and nothing. I'll bet my 12 year old son could do it in his sleep. But at 47 I'm going to do it my way!!!
 
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