Best frequency for metal detectors

Best frequency for metal detectors

The best metal detector frequency is in the range of 5 kHz to 15 kHz. This range is where most general purpose metal detectors are tuned in as well, and is also the easiest to manage for beginners. However, you can always get more specialized detectors once you master the basics.

 

How does frequency affect metal detectors?

The operating frequency of a metal detector refers to the number of electromagnetic waves (measured in kilohertz per second or kilohertz per second) that a metal detector coil is able to produce in a specified period of time, generally per second of operation. Metal detectors’ frequency can range anywhere from 1.5 kHz per second to 100 kHz per second. However, to be fair, most metal detectors operate between frequencies of 5 kHz per second and 25 kHz per second. This means that a standard metal detector is able to send between 5,000 and 25,000 electromagnetic waves to the ground every second.

 

Multi-frequency metal detectors vs. single-frequency metal detectors?

Most metal detectors are single frequency detectors. This means that it operates at one frequency and this frequency only or less than 10 kHz per second or above 30 kHz per second. The former is good at penetrating the ground and finding highly conductive targets. The latter is better at finding smaller targets with lower conductivity, but it also struggles with penetration into the ground.

However, there is a small percentage of newer devices that can detect two or more frequencies at the same time. These metal detectors are known as synchronous multi-frequency detectors. As I said, this can happen at the same time, or perhaps in a rapid imperceptible exchange pattern.

These detectors are just as reliable as single frequency detectors, but are clearly more capable due to their improved detection range. The only downside is that these machines can be difficult to use at times, and they definitely cost more than the average metal detector. However, if you are somewhat skilled and money is not a big issue, this new technology is definitely better (as long as the manufacturing quality remains unchanged) and well worth the investment.

Some of the newer simultaneous multi-frequency detectors can detect more frequencies than ever before. Previously, the standard was either one frequency or three frequencies (aka the three selectable frequencies). But, a new technology called Full Band Spectrum can detect up to 28 total frequencies simultaneously. This ensures that you can detect any number of targets regardless of size, composition or depth.

 

Best frequency to find coins?

Coins are generally closer to the surface and have a higher conductivity, meaning that the best coin hunting frequency is anywhere from 10 kHz and lower. This does not mean that some rare gold or silver coins will not benefit from higher frequency detectors due to their specific composition.

 

Best frequency to prospect for gold?

Gold is mostly found in small pieces, and of course in remote areas such as Western Australia. However, if it’s gold you’re after, you’ll need a 14kHz and above machine. The better, the more the gold has a very low conductivity, so it will be difficult to detect it in another way.

 

How does the ground’s mineralization affect frequency?

Given the impact that mineralization of the ground can have on the normal operations of a metal detector, it makes sense that it will also affect the frequency you should use to detect. First thing’s first, regardless of frequency, you should use a pulse induction metal detector if possible because it will not be affected by mineralization. However, low frequency is probably the best choice for high mineralization. The higher the frequency, the more affected by the composition of the ground and even temperature fluctuations.

Following this logic, when you are looking for treasure on the beach, especially a salt water beach, it is better to use low frequency pulse induction metal detectors. Moisture in the sand, along with salt and any other number of minerals, can cause false signals that affect high-frequency machines and very low-frequency machines.

 

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