Is it true about gold & silver KHz? please help

[Trashymetal]

Is it true about gold & silver KHz? please help

Just looking to update my first MD (Whites Prizm III) is it true that I need a MD that can go down to 1.22KHz to search only for gold ruling out all other items and 2.2 for silver, many thanks, I have found lots of coins/rings and great detector very light at just over 1kg but need to stop digging up the trash and only have notch but no discrimination on mine so possibly going for a Whites spectra V3

 

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[Eu_citzen]

Re: Is it true about gold & silver KHz? please help

Higher frequency better for gold
Lower Frequency better for Silver.
Now you don't have to be able to go to the lowest/highest frequency possible.
Even a few kHz make a difference!

As far as digging trash, get used to it!
Really its necessary to get some treasure, I'm afraid.

 

[Trashymetal]

Re: Is it true about gold & silver KHz? please help

Ahh ok thanks I was misinformed, So is it possible to get a MD with a meter in Khz that will tell me what type of metal it is? Or is it just luck due to mineralisation. The gold Saxon hoard of 1,600 gold items that was found last year worth over 3.2 million you may have seen on Discovery channel was found down road to me. Just my luck to start after the find lol

 

[Eu_citzen]

Re: Is it true about gold & silver KHz? please help

Most Metal detectors (MDs) do not show the Freq's, they just operate with them.
Most use NOTCH, VDI, SOUND to name a few.. Bother to mention 'em all!

I'd be looking into a XP if I where you, they've got good reputation in the UK.
By all means though, read reviews but take it with a grain of salt!

 

[Tom_in_CA]

Re: Is it true about gold & silver KHz? please help

As Eu-citzen has told you, some machines are better for low conductors, and others are better for high conductors. The key word there is "better". It doesn't mean that one machine "only" finds low conductors, and the other "only" finds high conductors.

Also, I think you are under the mis-impression that since some machines are said to be "gold" hunting machines (or "better" on gold, or whatever) that there is somehow the ability of machines to differentiate between metals. This is not the case (despite how machines may be titled/labeled). They are merely telling high verses low conductivities, NOT telling one metal verses another. So for example, gold and aluminum are both low conductors.

And size plays in to the conductivity game too. For example: An entire aluminum can might read at quarter or whatever. But a single fingernail sized piece of aluminum (like a tab, or beaver tail, etc...) might read down low at tab or nickel or whatever. But notice that in each case, the composition, namely aluminum, has not changed, in each case. Only the size of the amount of aluminum has (entire can vs tab). Thus the size plays into it.

 

[Charlie P. (NY)]

Re: Is it true about gold & silver KHz? please help

Just looking to update my first MD (Whites Prizm III) is it true that I need a MD that can go down to 1.22KHz to search only for gold ruling out all other items and 2.2 for silver, many thanks, I have found lots of coins/rings and great detector very light at just over 1kg but need to stop digging up the trash and only have notch but no discrimination on mine so possibly going for a Whites spectra V3

You have notch but no discrimination? I think you are mistaken. The Prism III gives you five "presets" of discrimination. "Notch" refers to a gap in the discrimination range of conductivity. Discrimination (aka: "DISC" or "Rejection" on some units) rejects metals of conductivity lower than the selected setting. Notch pulls in a range within that discrimination zone ("notch in") or rejects an additional range of conductivity above the discrimination setting ("notch out") So you can have discrimination with no notching capability (like my Minelab Musketeer) but you cannot have a notch without having some discrimination to be notched in or out.

It also pays to remember most detectors are designed to assume targets are coin sized and shaped objects in 12" or less of soil. For some a hubcap at two feet deep "looks" the same - that is has a similar conductivity - as a silver dime at 6 inches.

 

[Frankn]

Re: Is it true about gold & silver KHz? please help

O.K. forget about knowing the frequency! I use the Whites XLT. It has a bar graph on the display. That bar graph is telling you what metal is down there. If it is the dreaded aluminum, a little black mark will display about a 1/16" to the right of the center mark. If it is a silver coin, the little black mark will display on the right side of the display. etc,etc. The big bug in the ointment is that most targets are alloys which you get several black marks displayed at once. It is true that certain frequencies will respond better to gold or silver but only to a limited extent.
To see this you have to know how a detector works. It transmits a signal into the ground and all or part of that signal returnes. Your detectos gets three peaces of information from the returned signal. 1- the strength of the received signal as compaired to the transmitted strength.
2- the time it took for the signal to return.
3- the frequency shift of the return signal.
1&2 are used to figure the dept and size of the target. This causes problems sometimes because a large item that is deep can show as a small item that is shallow.
3 this is used to tell what metal is there. "background" all solid items have atoms that vibrate, but they vibrate at different frequencies.. So they have different return frequencies.

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[Charlie P. (NY)]

Re: Is it true about gold & silver KHz? please help

When you start to talk on the level of molecular vibration you should realize the wavelengths are in the nanometer range. Tiny fractions of a millimeter. Metal detectors detect in the VHF ranges. Wavelengths of KILOMETERS in length (several MILES long) (i.e. 3KHz is a 100Km long wave - 62 MILES long).

Your metal detector can't listen in to cell phone transmissions - at 2.4GHz. Molecular vibrations are millions of times smaller than those.

Quantum mechanics does not translate well into practical applications.

 

[Frankn]

Re: Is it true about gold & silver KHz? please help

I think you misunderstood what I said. The returned signal is slightly altered from the transmitted signal, not the resinate frequency of the target. That is what tells the detector what the metal is!
Lets hear your description of how the detector knows what metal is down there, but please leave out the nano & quirk!

Personal message to Charlie P: Don't bother looking in the box, the cat won't be there!

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[veronasteve]

Re: Is it true about gold & silver KHz? please help

i think what your talking about is to do with nugget hunting .....which is found in the us and oz! in which case machines with gold detecting coils and software might be important,,,,but for the uk and mr herberts hoard any good machine over £450 say will do,,,chunks of metal will always be detected no matter what the metal.