How Do Multi Frequency Metal Detectors Work?

Have you recently purchased a multi frequency metal detector and are wondering how it works? Perhaps you are considering making your purchase and want to know more about it? Or maybe you are curious about metal detectors and want to know how they work. Whatever your reason is, you have come to the right place for answers!

We know how confusing and murky the metal detecting world can be, especially if you are new to it all. Finding the right metal detector can seem daunting, especially if you don’t know the different types and how they work. One type that leaves most people confused and unsure are multi frequency metal detectors. 

So we are here today to put your mind at rest and get you the answers you need! Keep reading to find out what a multi frequency metal detector is and how it works to see if it’s the right fit for you! 

What Is A Multi Frequency Metal Detector?

Before we get into how a multi frequency metal detector works, let’s take a step back and have a quick recap for those in the room that need it!

A multi frequency metal detector is a metal detector that can use multiple frequencies simultaneously. They can be more expensive than very low frequency metal detectors, setting themselves as reasonably priced to expensive metal detectors. 

You can find some affordable options, of course, but they are few and far between and often require a lot of research to find. But if you have the budget, they can be fantastic additions!

The ability to detect multiple frequencies simultaneously can help you find more items better suited to beach detecting and for use in saltwater. If you like metal detecting on the beach, it can be a fantastic option for you! 

Multi frequency metal detectors often come with electable frequencies and an increased depth detection that makes them a popular choice with other detectorists. They also tend to handle mineralised soils better and are more multi-purpose than other detectors on the market. 

The downside to these is the heftier price tag than other detectors, which can put some beginners or those on a budget off.

You also need to consider that the efficiency of these detectors depends on the signal and processing analysis, and it’s best to check customer reviews for more information on specific detectors. 

It’s also worth noting that the multiple frequencies are not always disclosed to the consumer. You aren’t always offered clear information about how many frequencies are used and what they are.

Usually, this information helps you decide if the frequencies on the metal detector are best for you. Some brands now tell you how many frequencies the detector has and what they are, but be sure to contact the manufacturer if they don’t, and you want more information! 

However, if you are looking for a metal detector for beach detecting, capable of handling different frequencies simultaneously, then a multi frequency metal detector is the one for you! Now that we have covered what they are, let’s look at how these metal detectors work. 

How Do Multi Frequency Metal Detectors Work?

Let’s get straight into it! Multi frequency metal detectors work by outputting three to five different frequencies at the same time.

By doing this, you are more likely to pick up a target as you have different frequencies scanning the area simultaneously. It increases your chances of finding something under the ground and having a more enjoyable experience! 

There are currently two types of multi frequency detectors available for coin detection. Some of these will transmit square waves, which is effectively a multi-frequency transmission.

Others will use a more advanced transmit signal in the form of multi-period rectangular waves. These rectangular waves tend to give more useful information than square waves, offering more frequencies effectively. 

These can be more accurate and help find targets easily. The T signals that the detector transmits at different frequencies are usually not contaminated by soil mineralisation like other metal detectors, offering more accurate and promising results. 

These multi frequency detectors tend to be more stable than single frequency detectors, and as we mentioned earlier, are fantastic for use in saltwater and beach detecting. But they do come at a price.

The higher cost that we mentioned can be off-putting to some detectorists and is a factor you should strongly consider. 

But also, for the detector to run multiple frequencies simultaneously is a lot of work. As it sends these frequencies, it will require a lot of processing which takes time. It can hinder your performance and negatively impact the depth and reactivity of your metal detector too.

This means that you might miss items hidden deep below, leaving you disappointed. You can usually check customer reviews or product descriptions of the multi frequency detectors before purchasing to check the detector’s depth and accuracy. 

The setup of a multi frequency metal detector will be virtually identical to other detectors. You will still have a control box, search coil, transmit electromagnetic field, and target response like you would on other metal detectors.

There is plenty of information and tutorials online about how all these components work on a metal detector if you are curious. 

Unlike other metal detectors, multi-frequency metal detectors can detect multiple frequencies at the same time and detect items hidden deeper below the surface.

While they are more expensive, these detectors, especially those using Multi-IQ technology, will have a higher level of accuracy even at deeper lengths and make your detecting experience more enjoyable than before! 

Final word

And just like that, we have come to the end of our metal detecting journey today! As you can see, multi-frequency metal detectors can be a fantastic detector to use. Their ability to transmit multiple frequencies simultaneously increases your chances of finding a target both on or underground and is sure to offer an enjoyable experience!

While they can take longer to process and analyse results and have a heftier price tag, the increased accuracy has made them a popular choice with beginners and advanced detectorists alike. 



Written by Gavin Bowler

Keen history and blogging enthusiast. I love metal detecting. Read more of Gavin's articles.