Search Coils
Check out Garrett's search coil tech sheet!
Coil Shape
| Round (Concentric) | Elliptical (Concentric or DD) |
|---|---|
|
* Reliable technology * Less expensive |
* Broader sweep pattern over the ground * Narrower target response for better pinpointing * Lets you search closer against things like trees, fences, etc. |
Internal Coil Structure
| Concentric | DD |
|---|---|
|
* Large transmitter coil/smaller receiver coil in the same plane * Searches deep in the center of the coil diameter; the outside of the coil doesn't search at full depth * Symmetry helps to minimize electrical drift due to time and temperature * Better discrimination on shallow targets and flat iron objects |
* Overlapping D-shaped transmitter and receiver coils of approximately the same size * Searches almost the whole diameter of the coil at full depth * Greater depth in mineralized soil * Broad sweep pattern * Narrower target response |
Coil Size (8" round or 10" elliptical are standard size)
| Smaller | Larger |
|---|---|
|
* Lighter * Easier to pinpoint with * Superior target separation (important in trashy areas) * More sensitive to smaller targets (important in gold prospecting) |
* Allow covering more ground with each sweep * Increased depth on medium and large size targets |
Coil Size by Activity
| Activity | Size |
|---|---|
|
Coin Shooting |
Smaller coils offer greater precision. |
|
Relic Hunting |
Larger coils' extra depth is important for older objects (usually found deeper). Relic hunters usually hunt in more remote areas with less trash, so advanced target separation isn't as necessary. |
|
Beach Hunting |
Larger coils deliver best ground coverage for large areas. |
|
Gold Prospecting |
Smaller, elliptical coils are precise and very sensitive. |
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