Now it is time to talk about coils and detectors working at high frequency and about advantages and disadvantages of such a mode. Here we go.
HIGH FREQUENCY (11-18 kHz) is “specialized” in detecting artifacts made of bronze, silver and gold as well as small silver coins. As a rule such targets have small size, this is why detectors working at high or mid-frequency can hardly detect them – the definition of such targets jumps between “ferrous” and “non-ferrous” metal, or the detector defines such targets as “ferrous” metal objects.
One more weighty advantage of a high frequency is high-speed signal processing, it allows to use the detector for work in trashy areas. Due to high-speed signal processing and small side-to-side motion amplitude you can detect a non-ferrous target surrounded by ferrous metal targets.
At the same time high-frequency detectors are slightly inferior to mid-frequency detectors in finding copper coin-size targets and is considerably inferior to low-frequency detectors in the range of medium and large targets detection.
An unpleasant aspect of high-frequency detectors is their strong susceptibility to electrical interference and highly mineralized soils, which is especially noticeable when working with large diameter coils. Sometimes even a cell phone can cause interference problems.
It should be noted that high-frequency and mid-frequency coils effectively realize their potential irrespective of their size – from large 15” to small 5-7″ coils.
Metal detectors: X-Terra; Signum MFT, AT Gold; AT PRO; Gold Maxx Power.