Frequency of a Metal Detector

Metal Detectors Frequency

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.

Best Frequency for Finding Coins?

Coins are generally closer to the surface and of a higher conductivity, this means that the best frequency’s for searching for coins are anywhere from 10 kHz and below. That isn’t to say that some rare gold or silver coins won’t benefit from higher frequency detectors due to their specific composition.

Best Frequency for Finding Jewelry?

Although jewelry is often marketed as gold or silver, or even platinum, the reality is that these are often alloyed with other metals that have higher conductivity so a mid-range frequency detector is acceptable for looking for jewelry. Somewhere from 10 kHz and Above should do just fine.

Ground’s Mineralization

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.

Multi Frequency Metal Detectors

Multi frequency metal detectors are devices that incorporate technology that ensures the use of more than one frequency in order to detect targets.

Some metal detectors, such as the Impact Pro, include multi frequencies for search, which are 5, 14 and 20 kHz, and the user can switch between them according to his desire and the purpose of the search.

Recently, the synchronous multi-frequency technology has been invented, such as in the Equinox device from Minelab with Multi-IQ technology, which includes a technology that allows the use of several simultaneous frequencies in order to search for underground targets and this gives better coverage of different types of minerals with different sizes small and large, as the prospector can choose one Frequencies separately to search by it as in the Impact device.

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