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

Jungle
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Re: High Frequency coils

Post by Jungle » Tue Aug 22, 2017 11:02 am

Using it in rape stubble on HF 28Khz, going over a patch I've done before. Usual finds except cut quarters coming up but also digging bits of horseshoe which I don't normally.
DEUS 9" Elliptical, 9", 11" and 13" coils, MI-6, Propointer, WS4 x 2, 2nd shaft (Upgrade path:- F75+Sunray, X-terra-50)

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Re: High Frequency coils

Post by Kaleb » Tue Aug 22, 2017 11:20 am

Same here been caught out a few times on broken bits of horseshoe without the XY screen, With the XY screen it shows up as a horizontal line.
Never found so many 22 pellets and tiny pieces of lead going over previously detected areas, loves hammered coins and Roman grots on 74khz but yet to try the other 2 frequencies.

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Re: High Frequency coils

Post by Mud Max » Tue Aug 22, 2017 8:23 pm

The amount of positive comments from those who are using the HFs speaks very well for them.
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Jungle
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Re: High Frequency coils

Post by Jungle » Wed Aug 23, 2017 10:42 am

Kaleb wrote:
Tue Aug 22, 2017 11:20 am
Same here been caught out a few times on broken bits of horseshoe without the XY screen, With the XY screen it shows up as a horizontal line.
Never found so many 22 pellets and tiny pieces of lead going over previously detected areas, loves hammered coins and Roman grots on 74khz but yet to try the other 2 frequencies.
I'll give the XY a go and see if that helps with the iron. Not had so many cut quarters since the F75.
DEUS 9" Elliptical, 9", 11" and 13" coils, MI-6, Propointer, WS4 x 2, 2nd shaft (Upgrade path:- F75+Sunray, X-terra-50)

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Re: High Frequency coils

Post by cyprio42 » Wed Aug 23, 2017 7:43 pm

Hi
what frequency are you finding best for the hammys when using the 9" HF coil
thanks
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Jungle
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Re: High Frequency coils

Post by Jungle » Wed Aug 23, 2017 11:22 pm

cyprio42 wrote:
Wed Aug 23, 2017 7:43 pm
Hi
what frequency are you finding best for the hammys when using the 9" HF coil
thanks
I was using 30Khz. Just cleaned up last week's finds and there was also a fragment of a cut quarter, smallest bit of silver I've found.
DEUS 9" Elliptical, 9", 11" and 13" coils, MI-6, Propointer, WS4 x 2, 2nd shaft (Upgrade path:- F75+Sunray, X-terra-50)

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