FAQ - Coiltek Quality Metal Detector Coils Frequently Asked Questions

This page is designed to provide quick answers to many common questions we get asked from around the world. We hope that it will help you in your prospecting endeavors and lead to quicker results when you have any issues. We intend this to cover a broad range of prospecting queries and not only concentrate on the Coiltek product.

From time to time we will be updating this page with more questions as they arise and encourage you to contact us with your suggestions which could help others with their detecting experience.

1How long is the warranty for my Coiltek product?
At Coiltek Manufacturing(CTM) we provide a full 2 year warranty on all of our manufactured coils and accessories (some products may vary). This warranty starts from the date of purchase by the customer. This is applicable worldwide. This warranty covers any manufacturing errors like cracks in plastics or performance issues like no response which are from manufacturing faults – usually these are noticeable within the first few hours of use. The warranty does not cover normal use or misuse of the product. For a coil/product to continue to perform well it must be treated with care and not be used in a way that will jar or incur any sudden impact. This sudden impact may result in developing a noisy product. CTM, at its sole discretion, will determine the nature of the returned item and decide whether it is a warranty issue. Each individual case will be reviewed on its own merits and the more information you can provide the easier it will be for us to make a quick decision.
2Is the warranty transferable?
No, the warranty is only applicable for the original owner.
3What do I do to claim warranty?
When wanting to claim warranty within Australia, you can either return it to your place of purchase or send it direct to COILTEK MANUFACTURING, P.O. Box 91, Salisbury South, South Australia, 5106. It is essential you include your proof of purchase docket and a short note informing us of the problem which has occurred. Also include your return address and phone number as we may need to contact you regarding the product. If you have purchased a product outside of Australia you must return it with your proof of purchase to your local dealer who will handle the warranty claims. Ensure you include your return address and phone number whenever returning a product.
4Can my Coiltek coil be repaired? Where do I send it?
If you are within Australia then in most cases yes. There is a repair charge plus freight if the coil i outside of its warranty period. If you wish for your coil or any product to be repaired or reviewed you can forward it to us and we will assess the situation. Please include a note with your contact details and comment regarding the products behaviour. If you are outside of Australia then usually it is quite expensive to return the coil to us and if out of warranty can sometimes mean a new coil purchase. Please contact your local dealer for more information.
5Can I repair any part of my coil like cracked plastics or the plug?
Usually yes especially if you are in the middle of a planned trip and the coil is out of its warranty period. Any repair or modification not performed by Coiltek whilst the product is under warranty will void the warranty for that coil product. Regular inspection of your product can ensure you get on top of any damage early and help you use it for longer.
6Can a coil just stop working? How do i look after my coil?
Sometimes this can happen depending on the age of the coil or how it has been stored. The most crucial part to protect on the coil is its cable, especially where it enters the coil housing. If the cable happens to break at this point it is not fixable and must be returned for repair. If your coil is a fully submersible coil and there is a break at this part then the coil is not repairable. If you notice this, we recommend you turn off your detector quickly and avoid using the coil until fixed or replaced. To prevent coils being damaged we recommend that the skid-plate is used at all times. Also, ensure your coils are stored carefully and no moisture enters the coil. Always check the strain relief area where the cable enters the coil for cracks or signs of wear. Regular inspection can help prevent things going wrong in the field.
7Can water damage my coil? What coils are waterproof?
Definitely yes, only if the water gets to the internals of the coil. If you have a fully submersible coil then water will not damage the coil. Water will short out any contacts and make the coil extremely noisy. For a complete view of what our coils do and which ones are fully submersible view our Coil Comparison Chart. For quick reference here is a list of water proof coils we manufacture, the rest are only water resistant: 6" Round All Models 10x5" All models 15” All models 40x20” Anti-Interference
8How do I pinpoint with the ELITE coil?
Pinpointing is basically the same as other coil configurations however the method of tilting the coil on its side for mono’s may not be the best with this new design. Using the cross hairs method is more accurate. In this method you work up to the target found in a sweeping motion and listen for the loudest tone and visually note where the sound is heard under the coil. Usually the loudest tone is quite central to the coil width. Mark the ground with your foot in a line along where you believe the target is. Now turn 90 degrees to this line and again slowly swing up to the target area and repeat the first method. You should now have two lines which intersect. This intersection is a good way to dig in the right place. If the target is out of the hole, spread the dirt from the dig with your shoe so it is has a flat surface and slowly swing over the area listening for the loudest tone to appear. The most sensitive area of the coil is around one inch in from the edge of the coil plastics. We also recommend you use a test piece on the ground and practice the technique listening for the most repeatable, responsive area of the coil so you become used to a method that works best for you.
9Can I get an extension lead for my coil?
Yes, we can make an extension lead for almost any coil. There are certain lengths which limit performance and for DD or Anti-Interference (A.I.) coils there is a link which needs to be removed from the coil plug for the extension cable to work efficiently. The diagram for the link remove modification will be supplied upon request when purchasing an extension cable. Maximum length for coil cable including extensions are: DD or A.I. CABLE – 4 metres (total length including existing cable length) MONO CABLE – 10 metres (total length including existing cable length) NOTE: at the maximum suggested length there potentially can be some performance loss due to the length of cable.
10If the cable is too long for me can I have it shortened? Does this change its performance?
Yes, shortening a coil cable is fine however there will be a minimum distance required from the control box and headphones. If you are too close to these parts then there can potentially be an increase in noise through your detector. We really only notice performance issues when the coil cable is too long. The increased resistance of the length of cable affects the coils ability to transmit and receive within the frequency of the detector. The standard coil cable length is perfectly adequate for the detector to perform its magic and we have noticed no performance increase when shortening the cable below this length.
11Can I run my Coiltek coil without a skid plate? Does it void my warranty?
Yes. However it is always recommended to use a skid plate to avoid any unwanted damage to the coil base especially with the plastic housed coil type. Running a Coiltek coil without a skid-plate does not void warranty.
12What are the benefits in using an Anti-Interference coil?
An anti-Interference (A.I.) coil has unique abilities which set this coil apart from the others. Its main purpose is to eliminate any external interference which the metal detectors are susceptible to. The interference can come from Salt Lake hunting, electric fences, power lines, phone towers, metropolitan areas, airports, solar activity etc. By using a coil of this type you can use your detector with little or no interference noise unlike a DD or MONO. The next benefit is that the performance of the A.I. coil is only approximately 5% less than a DD coil of similar size. Therefore you can be assured that you are getting excellent depth and sensitivity where ever you use this coil type. This coil type has already been used with great success on and around salt lakes and directly under power lines in a gold bearing area. It has helped many obtain more targets in these areas as in the past no detectors could hunt in these locations with any great success. We have many people using these coils as a general hunting coil. We believe it is an essential tool to have in your detecting kit.
13I live overseas, where can I get your product?
We currently have an extensive network of dealers and distributors around the globe. Please see our where to buy page for one closest to you or contact us and we can advise you the best place to purchase.
14How should I store my coil when not in use?
Storing coils properly is essential to ensure good life from your product. The main area to protect is of course the cable, especially where it enters the coil. Most of the failings we see are at this point mainly due to constant use or pressure being placed on the entry point. When storing the coil make sure that the strain relief area has no pressure placed on it by way of other objects laying on top or being placed in tight areas. The more the cable bends in this section the more the risk of it breaking wires internally. We suggest protecting this area by means of cardboard packers or bubble wrap wrapped around the strain relief. Remember that the last thing you need happening is a coil failing in the field when you have travelled a great distance to get there. Always check you full kit before you leave!
15Is round better than elliptical?
This answer depends on what ground you hunt and what you prefer to swing. However here are some points which might help you decide what you would like to use. With the round coils you have a broad search field being emitted and this can help with depth but with the larger round coils (18” and above) can reduce your sensitivity to the sub gram targets. The round coils have the ability to cover lots of ground but can be hindered somewhat if the terrain becomes overgrown or covered in large rocks. They can pinpoint well but do take some time to find their ‘sweet spot’ but many operators are very confident with these coils. The elliptical has a narrow search field but can compensate for this as it is longer from tip to heel. It has a better ability to maneuver through tight detecting areas and can also pinpoint a little better due to the tight field at its ends. They have a great ability to cover lots of ground as they are usually longer than the equivalent round which can save time. Also because they are quite narrow compared to the round they provide a better target separation which means when you encounter two targets close together the coil can help identify to the operator that there are two targets in the ground. The Elliptical is a very popular coil for its all round ability. By assessing your hunting area and knowing the approximate depth you wish to search to will help you choose what coil to use for that area.
16What is the deepest searching Coiltek coil?
This all depends on what metal detector you are using. It is best to contact us and we can assist you in choosing the best coil for each individual situation.

Gold Extreme Series

Frequently asked questions about the Gold Extreme series.

1What do small coils do differently to the larger ones? What could you expect when using these coil types?
Smaller coils are great for the little nuggets, less than half a gram, which are reasonably close to the surface, within 100mm. They are great for areas that have been surfaced down to bedrock. Also good for species that don’t have a lot of gold in them, so ideal for detecting exposed reefs. Their physical size makes them ideal for working heavily vegetated areas and creeks with large rocks. Larger coils can detect targets deeper, but only when the targets are larger. They are not as sensitive to the tiny nuggets. They cover a lot more ground for each swing but can be difficult in areas where there is a lot of vegetation. Both small and large coils can pick up a range of target sizes however the targets need to be within the range of the magnetic field of the coil for it to respond. For small coils the field is smaller than the larger coils, but with smaller coils you have a tighter field so sensitivity is improved. Larger coils fields are broader and less sensitive but can punch deeper in to the ground than the small coils.
2There are now more choices of coils for the SDC2300 detector, what could you think about when deciding what one would be best for you?
With a choice of coils now available for the SDC2300, choosing the correct coil for the right environment can enhance performance of this machine. When detecting in thick vegetated areas, the 10"x 5" GOLD EXTREME is the best choice because its dimensions allows access to tighter areas in dense bush-land. In large open areas, where the gold is sparser and the vegetation less dense, the larger 14" x 9" GOLD EXTREME which provides greater ground cover which is optimum in these broad areas. The 11" GOLD EXTREME has the capability of finding larger nuggets at depth which the smaller and standard coils may miss and would be the choice for deeper ground where targets may be expected at depth.
3There is not one coil that will ‘do it all’ and this is the reason for more coil choices. The following are some points that new and experienced detectorists could consider when using the new GOLD EXTREME coils?
Most other metal detectors already have a range of coil sizes and types for each machine which suit different environments. Now the SDC2300 detector has a variety of coils that could enhance the detectors capability of finding gold in different environments. Each coil has a specific purpose and as with other metal detectors, these coils may greatly improve the capability of finding gold. Having gold extreme coils in your detecting toolkit, will provide the ability to select the most appropriate coil for the given situation. The combination of new coils offers the same flexibility for the SDC2300 that has been available in other machines.
4When choosing the 10x5" GOLD EXTREME coil, what could you expect performance wise from this coil?
Small coils are best at finding tiny nuggets that the stock coil may not see as well. Small coils are ideal in rough terrain and good at getting into tight spots, cracks, crevices and between rocks where the nuggets like to hide. Due to this coils elliptical shape it has an easier ability for pin pointing and easier manoeuvrability in rougher terrain. The small coil can have a brighter signal response on small targets due to a tighter magnetic field and this can be the difference between hearing a signal or not.
5When choosing the 11" GOLD EXTREME coil, what could you expect performance wise from this coil?
With the 11" coil you could expect greater depth on larger nuggets. The coil won’t be as sensitive to tiny nuggets as the 8" standard but you can use the 10x5 coil for chasing them. Due to the coils larger size you could use the 11" coil as a patch finder possibly assisting to locate new nugget bearing ground by covering a greater area more quickly. Areas you have been over with the original coil, can now be detected deeper into the ground.
6When choosing the 14x9" GOLD EXTREME coil, what could you expect performance wise from this coil?
This large elliptical coil has the best ground coverage providing 6" extra per sweep. You could expect the 14x9" coil to penetrate deeper than the standard coil, cover more ground than the 11" and 10x5" coils and run smoother in highly mineralised ground. The Elliptical shape allows for the toe of the coil to get up under brush a little easier than stock coil. Pinpointing of the targets can be faster with this coil. Performance on small targets would be less than the standard coil but it would pick up deeper targets than the standard coil.