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Would a Hockey Puck work with the Goldscan 5?

A

Anonymous

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Checking the coil sizes for ML PIs,I believe the smallest coil which could be used with the soon to be released GS 5 is the Joey coil which is 5"X 10". I use a mono hockey puck sized coil(5") with my VLF which is excellent in high trash areas.
Has a hockey puck 5" mono coil ever been made for a PI? Apparently mono coils below 8" were not needed in the beach and prospecting environments of the past with pulse induction. Is not the smallest PI coils out there the Garrett's 3"x7" DD and the Joey 5"x10"?
However,if we follow the Infinium example, you are going to find folks who are going to use the GS 5 in ways other than at the beach and in prospecting(actually a lack of inital coil sizes did not help the Infinium here). Because of it's depth in highly mineralized ground a coin/relic function has been applied to the Infinium(certainly a challenge for users for sure). Thereby, it is reasonably to assume some folks(including myself) may wish to experiment with the GS 5 in uses outside the traditional beach/prospecting modes. Is there a role for the hockey puck with a PI unit similar to that employed by VLF users?
It appears from the field tests that the GS 5 would not need a DD in most situations. If a mono 5" could be made for the Goldscan 5 would it have advantages over the 8" mono coil?
1. Would you have better iron ID for the smallest piece of iron for a 5" coil compared to an 8".
2. better iron separation in high trash areas?
3. better sensitivity for the smallest nuggets? (or how close to the Gold Bug can you get?)
Just wondering
George
 
Hello George,
Coiltek made a 3" mono coil a few years ago and I have one.. I used it in W. Australia for pinpointing deep targets and it worked perfect...
I imagine there are some around. If you are serious about using a small high quality P.I. coil, go for it... I think they were around $100 originally... I will never sell mine as it has so many uses in prospecting...
Regards, Jim
 
Hi George,
Any size coil can be made for a PI. I used to make 5in and 2.5in coils, as accessories, for my PI's, some years ago. More recently, I made a 3in coil for a SD2200, which went to a customer in Kalgoorlie.
The smallest coil shell that I have at the moment is 5in diameter but other sizes can be made to special order.
Iron ID, target separation and pinpointing are all improved with a small coil. Small object sensitivity is not improved as much as one might think. This is due to the fact that it is the pulse delay which is the limiting factor.
Eric.
 
George,
I have been tinkering with a 3/4" coil on a
CS-6. that will detect a US nickel deeper than
7" air test.If it will work on a Goldquest-5,
I suspect that it would detect a nickel from 9 to
14".I wont talk about it, dont ask.
What you are looking for will work. go for it.
Frank.
 
I think you have to be careful Frank with the elctronics matching and not screw something up! I don't believe the coil you made if it matches the CS6 will work very well on the GS5, unless the frequency has been changed from the GS4. Don
 
Frank, What kind of ferrite rod did you use and how long was it?
 
Dave,
I dont know what kind of rode it is(what its made
of)They came from my scrap pill.10 or 15 years ago
I was into non-ferrous magnets,been useing what I
had learned back then with what I am tinkering with
now.longest coil was on a 4" core. a slug that is
1-3/4" that will go deeper.Still expermenting.
Dave on a coplanar coil,the receiver coil is twice
turns as transmite coil.do they both have same
inductance.Thank's
Frank.
 
Frank,
The inductance of the receive coil is not at all important. This is also true as to the number of turns on the receive coil. You can make the receive coil with the same number of turns as the transmit coil and it will still work. Using twice the turns will however give you a stronger receive signal. You can however simply double the coil amplifiers gain and use the same number of turns on the receive coil as the transmit coil with only a slight loss in the signal to noise ratio if you wish.
What is important is to keep the ratio of the transmit coil to the bucking (feedback) coil to the formula stated. The ratio is the area of the transmit coil to the area of the receive - bucking (feedback) coil. For a Transmit coil which is twice the diameter of the receive and bucking coil then the ratio of the two areas is four to one. The bucking (feedback) coil will then have one quarter the number of turns that the transmit coil uses.
Remember that you wind the bucking (feedback) coil over the top of the receive coil. The end result of this looks like only two coils with one mounted inside the other. These coils are simple to make but you really need an oscilloscope to make one properly.
Remember also that the article on Geotech explains a searchcoil for use with a PI detector. A searchcoil for a VLF demands knowledge of the transmit coils inductance as well as other things.
 
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