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22.5cm (9”) Round DD coil:
13 to 15.7kHz, 26 to 31kHz, 50 to 59kHz
24 x 13cm Elliptical DD coil:
13 to 15.7kHz, 26 to 31kHz, 68 to 81kHz
4 frequencies (4kHz ; 8kHz ; 12kHz ; 18kHz) + shift plus/minus
Despite all the excessive hype, the advantages in the UK are minimal for the white coils, unless you are searching for small gold nuggets or in heavily mineralised soil then the black coils have more advantage with the lower frequencies for depth, and 12-18khz is more than adequate for small hammered without loosing all the depth.
This is a good video showing the elliptical coil in use on UK soil and also on a highly mineralised test bed, I know air tests are not the same as being in the field but it does look like it has a use on some sites. I have one coming Monday and looking forward to seeing how it performs.
Stock HOT with sens lowered to 86.