A high enough frequency, but compared with the 9х12 and 20 kHz coil, is less demanding on the influence of the soil. High frequency allows reconnaissance of the terrain for the presence of small targets in the ground. Steadily works on soil of any complexity. It is well suited for working in medium-littered areas, when copper coins are found in poor preservation, and then maybe you should focus on finding small silver and use this coil.
Disadvantages of the coil:
1. Small depth for large and medium coins.
2. Like a coil with a frequency of 20 kilohertz, it has a tendency to sensitivity of rusty iron, but more loyally.
Advantages of the coil:
1. Well identifies small non-ferrous targets at great depths.