A smooth change of 4-18 kHz frequency with one and the same coil. Static, dynamic and mixed modes. Variable recovery speed. Wireless technologies. Maybe the Polish manufacturer is way ahead of all Garrett, Minelab, Fisher, and XP put together? Watch the video: testing a Polish-made Rutus Alter71 metal detector.
The Polish manufacturer rolled out a new machine – Rutus Alter71 – in autumn 2016. I am trying to remember… Is there any other detector capable of changing the frequency in the range of 4.4 kHz to 18.4 kHz smoothly (almost smoothly, with a 0.2 kHz step)?
A 4 kHz frequency is awesome. Try to conduct the following test with your metal detector: take a stack of copper coins and pass it edgeways under the coil. If it’s not a Minelab E-Trac or Minelab CTX 3030, you will get an iron signal. However, these coins are made of copper. It’s only the low frequency that will be sensitive enough in detecting such a target (with a pattern kinda coins in purse).