I am looking to buy an additional coil for my MK 14kHz to get some extra depth while in the field. I cannot decide between AF35 and KR40. Could you please advise which coil shall I purchase to add some depth for coin, jewellery and relic hunting and why?
I would really appreciate your answer!
Thank you in advance!
Good morning, just looking for some feedback on the CoilTek 18X12 Goldstalker Mono Elliptical coil. Anyone had any experience with it? If so, what are your opinions on its abilities please.
On a different note, how about the Minelab Commander 15X12 semi-ellipitical mono?
I realize there are newer, probably much better coils for the GPX, but I'd really like some information on either of these coils by anyone that's used them.
Any feedback on either coil is much appreciated, including which one you think might be better than the other . . . (I've never used either one, but have a chance to buy, but can't find any reviews so far except by the manufacturers.)
Thanks for your time, and all the best,
By Steve Herschbach
As introduced on the White's pulse induction detectors beginning in 2008.
A new dual field search coil for pulse induction metal detectors has multiple coplanar wire coils of different diameters connected in series with the output of a pulse source, overcoming the loss of target size resolution associated with a single coil search loop. Small objects are sensed by an internal small coil and larger objects are sensed by the larger outside coil, and the overall depth of target sensing remains similar to that of a single coil construction. The smaller coil is isolated from the pulse source by the inductance of the larger coil and will ring at a frequency determined by its own parameters. To prevent the smaller coil from ringing, a second damping resistor is connected across the terminals of the smaller coil at the junction of the large and small coils making up the modified search loop.
White's Dual Field Search Coil
I have been playing with my Garrett Euroace (Ace 350) for the past couple of days, working it out and learning the machine to teach my daughter how to use it. I was air testing some modern coinage to see what notches on the target ID scale they come up as so I could set up her discrimination. I got lazy and started waving them on the detector side of the coil, I noticed I was able to detect the coins all the way up to past where the shaft changes from plastic to metal, this is at 40cm, 15.7 inches in the old digits, this was with the coil straight too so when it's tilted it's even closer to the metal part of the shaft.
This means the coil is obviously seeing the metal shaft, if the coil is moving such as adjusting it's tilt I noticed the detector gets a target in when in all metal, if I use my heavy coin discrimination pattern it doesn't false when the coil moves. I was wondering why this was falsing when the coil moves was happening yesterday until today when I was able to duplicate it when I discovered by accident I could detect coins past where the shaft changes to metal, it's the coil picking up the metal shaft!!! If I move the coil with it sitting on my table, even the slightest bit it rings off on the shaft!
I realize I've not got the stock coil on there and the Nel Tornado is known as a deep coil but this is now a problem for me and the only solution I can think of is to notch out the discrimination point where the shaft sits so it can't see it, but then it may miss good targets in that range too.
I don't want to put the stock coil back on it, the stock coil wasn't too great and I really like this Tornado coil.
Are there aftermarket shafts for Garrett that have a longer lower shaft? or is there some shaft from another detector I could mount it on that is longer in the plastic part? I'm not a big fan of the shaft anyway, it doesn't even have Cam locks so a replacement shaft wouldn't be such a bad option.
Here is a quick video showing a coin detecting past the shaft change over point, the amazing thing is the Target ID for the coin is bang on where it should be even at that depth.
Any help with this one would be appreciated as I've now given the detector to my daughter who decided she likes detecting now (finally) as she has a yellow bumble bee looking detector that can discriminate virtually everything out except our gold coins 🙂
I just got my 6” coil, and a dedicated lower rod is on the way. To make on-site coil changes fast and easy I came up with the following system.
Each lower rod and coil have the cord fastened near the bottom with just enough slack to flip the coil flat for my carry bag. Then I made the straps shown with adhesive backed Velcro from the $ store. The soft part goes around the middle rod by it’s adhesive backing. But then it extends 2” and the hard part of the Velcro goes on the sticky side of it so one side is hook Velcro and the other side is loop Velcro and then it is trimmed narrower with scissors. I have one of these on either side of the folding mechanism I installed on my box shaft. What saves time in the field is that these straps stay on during coil change and securely fasten the coil wire.
Also, in my case with the folding shaft I used zip ties to make a loop in each coils cord to go where the folding mechanism is where the cord never interferes with the folding or unfolding of the shaft. I will keep the other coil in my detector bag so I can change the coil during a detecting outing it the situation warrants it.
No big deal but easy enough that others may consider doing this method of strapping. A