![]() ![]() In 2002 White's introduced the White's MXT at 14 kHz, and it is a perfect example of how detectors running in the "teens" make excellent "do-it-all" detectors. Examples would be the 48 khz White's GMT, 71 kHz Fisher Gold Bug 2, 56 kHz Makro Gold Racer, and 45 khz Minelab Gold Monster 1000. Machines 30 khz and higher tend to be dedicated prospecting machines. Their extreme sensitivity to tiny trash items like aluminum bits do not make them very practical for any detecting except gold prospecting. High frequencies 30 khz and over have extreme sensitivity to low conductive and small items, but also struggle more with ground penetration and hot rocks. There are too many models to list but most people have heard of the 6.5 khz Garrett Ace 250 as a perfect example. Low frequency machines under 10 khz therefore tend to be aimed at the coin detecting market. ![]() Many do not even offer ground balance controls because a factory preset level works well enough for some uses. ![]() Low frequency detectors also do not "light up" the ground or hot rocks as much as detectors operating at higher frequencies. If you look at this typical metal detector target scale below you will note that non-ferrous items read higher not just based on conductivity but size also. Low frequencies, that is single digit frequencies under 10 kHz, react well to high conductive targets, like coins, or large items, even if those items are of low conductivity. Most metal detectors process a single frequency. The ICMJ has a policy against mentioning brand names in articles so I wanted to post this as a supplement to the article. Those of you with a digital subscription can read it online. The latest issue of the ICMJ is out, and I have an article in it titled Selectable Frequency vs Multi Frequency Detectors. ![]()
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