Best Frequency for Detecting Gold _ Directed to Carl-NC

[ZuMi77]

What is the best frequency for detecting gold using a two-box metal detector which generates pulse signal?

[Detectorist#1]

Short question with long answer..... especially for two-box PI MD!

[Detectorist#1]

Working frequency for pulse detectors is not so essential as for VLF detectors. Other parameters have main role in the detecting.

[Detectorist#1]

But your question is very interesting. The strange using of DD coil and Omega coil in pulse detectors give us "Hybrid" detectors in range 0f 2008 to 2024 years. Maybe the strange using of two-box coils in pulse detectors will give us the next variant of "hybrid" detectors. But maybe it's time for Carl to explains what to expect.

[ZuMi77]

Thank you all for your replies.

Please note that I'm interested in a two-box metal detector with a transmitter that puts out pulsed signal.

[Carl-NC]

Please note that I'm interested in a two-box metal detector with a transmitter that puts out pulsed signal.

Why?

[ZuMi77]

Dear Carl-NC,

I'm seeking your recommendations. If you are referring to the "pulsed signal", as far as I know, pulsed signal is better for detecting gold than sine wave signal. So, any recommendations are based on this. Please correct me if I'm wrong.
In the metal detector article it says "the transmitter puts out a pulsed signal".

Yours

[GeoMax]

Hi ZuMi77,

why do you not try it out yourself and determine the best frequency for gold? A suitable simple two-box detector for that would be the T/R locator. With that detector you can easy select different frequencies with just a jumper each. This gives you already the direction which frequency would work for detecting gold the best. After finding the right direction of frequencies, you can fine tune it. The circuit diagram of the T/R Locator can befound on Geotech Forum as well.

[Carl-NC]

Dear Carl-NC,
I'm seeking your recommendations. If you are referring to the "pulsed signal", as far as I know, pulsed signal is better for detecting gold than sine wave signal. So, any recommendations are based on this. Please correct me if I'm wrong.
In the metal detector article it says "the transmitter puts out a pulsed signal".
Yours

I depends on what you are looking for and under what ground conditions. The question is, why do you want a 2-box PI system? That's a pretty specific request that practically no one else uses.

[Detectorist#1]

Hi Carl,
Yes, that's a pretty specific and no one else uses but maybe have some new possibilities. Two-box coils configurations also uses induction balance configuration. This is next configuration maybe useful for hybrid MD creating.

[ZuMi77]

I depends on what you are looking for and under what ground conditions. The question is, why do you want a 2-box PI system? That's a pretty specific request that practically no one else uses.

Thank you Carl for the answer.
I may misunderstand something; in the ETI 566 project it is said that "the transmitter puts out a pulsed signal at 20 KHz"; that's why I said that the metal detector generates a pulse signal. Thanks for your patience; I'm not an expert, but I can say I am a hard-working student.

If you don't mind, please check the highlighted text on pages 1 & 6. I have an enquiry; there is something I don't understand. I hope you can help explain it.

On page 1:
The transmitter puts out a pulsed signal at 20 KHz.

On page 6:
Hartley oscillator operating at around 100 KHz.

The transmitter puts out a pulsed signal at 20 KHz, but the Hartley oscillator (which is the main part of the transmitter) is operating at around 100 KHz.

[Carl-NC]

OK, now I understand. ETI 566 is an old TR design that uses a squegging oscillator. You would do far better to use a modern VLF design or a PI design. Again, it depends on what you are looking for.

[ZuMi77]

OK, now I understand. ETI 566 is an old TR design that uses a squegging oscillator. You would do far better to use a modern VLF design or a PI design. Again, it depends on what you are looking for.

The expected target is around 1 liter paint can or bigger.

If you have time, please take care of the enquiry.

[Loufihamza]

Hey