One of the bad things about the DD coils is sometimes bottle caps are harder to tell from good targets. With a little practice and keen ear to the audio one can tell the tell tale signs of a cap. Usually falsing at the tip or heel of the coil is a great indicator. I feel the advantages of depth and separation greatly outweigh the negatives of digging a few screw caps. I also will prefer a smaller coil over a bigger coil in most situations. Yes bigger coils get more depth but the main trouble I see is not the depth it is the target mashing of trashy areas.
I have found more good targets with the stock coil or smaller coils. If you have any questions about metal detector coils or detectors in general please contact me. I would be more than happy to make you great deal and answer all your questions.
These features are particularly useful if you find yourself searching for small objects in particularly littered areas. Metal detecting is not as simple as choosing a metal detector unit, adding a search coil, and then starting your adventure.
Pulse induction PI technology uses a single coil to act as both a transmitter and a receiver. Alternatively, they may also use multiple coils that work together as one unit. Hinted at by its name, PI sends short, powerful bursts of currents, known as pulses, straight through a coil of wire. These pulses generate a brief magnetic field, which then reverses polarity and collapses the moment the pulse ends. The result will be a sharp electrical spike.
As for VLF, this technology uses two coils to operate. One coil acts as the transmitter, while the other coil receives, therefore allowing the user to pick up on the targets in the ground. The coil that transmits creates a magnetic field to react to any metal objects around.
Once it finds its target, a current forms. The receiver coil then takes that signal and amplifies it so that you can hear it through a speaker or your headphones if attached. Some metal detectors with VLF technology can also translate the received signal into a number if the current is strong enough for it. However, it does indicate that the grains or the particles inside the ground soil will produce a magnetic response.
It can also mean that they will be attracted to a magnet. More specifically, highly mineralized soil will have similar characteristics to metal. There are various levels of ground mineralization too.
For example, new soil is typically low in mineralization. This is something to always keep in mind while metal detecting because the minerals in the soil can lead to false signals. This is because the metal detector will focus on picking up the metal characteristics in the soil rather than any actual treasure.
Going to the beach, however, can cause a mixture of mineral and salt issues that can create issues with false signals. Pulse Induction, in particular, does well at coping with mineralization. What type of ground are you typically searching on? Are you searching in underwater areas? Is the area filled with high or low ground mineralization? Some search coils will work better in certain situations than others. If you get a larger search coil, you will have a better chance of getting larger ground coverage and at greater depths.
This will help you to discover those larger targets. At the same time, you must remember that you may be sacrificing high levels of sensitivity for this increase in the scanning area. This will likely prevent you from locating smaller targets. When you look at it the other way, smaller search coils are excellent at target separation. They may be the best choice to handle those trashy areas so you can look through all the litter and find the treasure beneath.
Their main purpose is to achieve maximum depth on larger nuggets. As the detection field is less dense close to the coil, but spread out over a bigger area, this results in a slight loss of near surface sensitivity, which can actually help to reduce the signal response you may get from hot rocks and hot pockets of ground. The other benefit of large coils is that they usually make you improve your technique, by sweeping the coil slower and more methodically, and moving large obstacles out of the way, which can lead to more gold finds.
Coil Shape — Round vs. Elliptical One of the main differing factors in coils is shape. So how does the shape of a coil change its performance? As a general rule, a round coil has the capability of more depth compared to an equivalently sized elliptical coil. This is due to the transmit winding being physically wider, and the way the electromagnetic field is transmitted into the ground.
A round coil handles ground mineralisation well, has good depth, and is easy to achieve good coil control when swinging. However, the larger sizes can be difficult to manoeuvre in heavy vegetation, and give a reduced signal response to smaller shallow targets. The main appeal of a round coil is that they will always achieve better depth than an equivalent sized elliptical coil, assuming they have identical electronic properties. However, elliptical coils come with their own advantages, mainly very good sensitivity, a sharper less broad signal to deeply buried targets, and better ground coverage at depth.
All these benefits are the reasons why elliptical coils are often the preferred choice when it comes to patch hunting. An elliptical coil is also better in thick scrub, and will give a great signal response on smaller targets, being especially sensitive at the toe and heel of the coil. However, this can work against you at times as it also gives an increased response to hot rocks and mineralisation pockets.
As always, it is all about compromises, and elliptical coils do have a couple of negatives. For a Monoloop winding in an elliptical shape, the response on the side of the coils is poor compared to a round coil, which the user needs to be aware of when detecting around obstacles.
Standard Coils The standard coils included with most gold detectors will be a coil size and shape that will be a good all-round size to complement the technology used and the performance characteristics of the detector. The Mono position will operate a little more smoothly. The DD position may give a slightly brighter response, but it is a very small difference.
Next time you come across a faint response, try both and see what you think. Remember to re-ground balance when you change switch positions. Cheers, Nenad. Toggle navigation. Share this story. November 6, Leave a comment. May 9, 2 comments. May 5, 7 comments.
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