High Frequency coils

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El Dorado
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High Frequency coils

Post by El Dorado » Sun Jul 30, 2017 1:21 pm

Sorry if this has already been spoken about but, what is the difference in the coils other than the size?

Hauptmann aD
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Re: High Frequency coils

Post by Hauptmann aD » Fri Aug 04, 2017 10:59 pm

This high frequency - its much higher for the elliptical (around 80 Khz).

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Dave8472
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Re: High Frequency coils

Post by Dave8472 » Sat Aug 12, 2017 9:55 pm

Also the new white ones do not go down in frequency as low as the black ones.

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

Black coils

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.

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Kaleb
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Re: High Frequency coils

Post by Kaleb » Sat Aug 12, 2017 10:27 pm

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.

https://youtu.be/3HAQ8JjYrNs

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.

Rivers rat
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Re: High Frequency coils

Post by Rivers rat » Sun Aug 13, 2017 3:05 pm

Testing the elliptical at the moment on the Thames and having fun....


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Kaleb
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Re: High Frequency coils

Post by Kaleb » Wed Aug 16, 2017 7:51 pm

Had an hour out on pea stubble earlier with the HF Elliptical coil on a highly iron contaminated area and had 2 hammered and a small buckle in amongst the iron, early days but very impressed.

Stock HOT with sens lowered to 86.

::g

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