4 kHz, 14 kHz or 28 kHz VLF Detector question

[Tony (Michigan)]

I've been looking into some VLF metal detectors. This one company has a relic and a TID.

I know for sure they have the 14 kHz TID detector. They were supposed to come out with the 4 kHz and 28 kHz TID as well.

Wouldn't the lower 4 kHz be less succeptible to iron nails and rusty bottle caps? But the trade off is wouldn't it be more succeptible to pieces of aluminum foil? Of course it would be hotter on gold.

This afternoon I was able to access their web site but, all over the world, each web site which sells their detectors is now being updated so I am hesitent to name the brand.

So, what's the best for coin shooting and getting around iron? 4, 14 or 28 kHz?

 

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[Charlie P. (NY)]

My Minelab is 7 KHz and LOVES aluminum. My Fisher is 13 KHz and seems to do better on nickels and is less fooled my aluminum - but it is also newer generation-wise and also has TDI read-out.

I'd go with the 13 or 14 for coins. In fact, I did!

 

[Rawhide]

I dont dig foil with my etrac. The F75 and AT Pro hits hard on foil. If your coin hunting shoot 14k, gold 28k, or deep targets bigger than a quarter 4k. Good Luck.

 

[Tony (Michigan)]

I dont dig foil with my etrac. The F75 and AT Pro hits hard on foil. If your coin hunting shoot 14k, gold 28k, or deep targets bigger than a quarter 4k. Good Luck.

Interesting. I went to Tesoro and their Lobo gold detector operates at 17.8 kHz, Garret's gold detector operates at 18 kHz to find gold nuggetts.

 

[Terry Soloman]

You do not want to go above 14kHz for a coinshooter. Higher kHz see SMALL targets much better, while lower kHz see coin size targets better and deeper.

 

[sprailroad]

It has always seemed in the past that, the lower freq's , such as 4kHz as you mentioned, were better on copper, silver and brass, and perhaps a little deeper as well, the higher numbers like 14kHz, 28kHz etc. were better on say gold and other low conductivity items, (lead sinkers, pull-tabs, nickels), in fact in the past the "normal" on new detectors was about 8kHz for all around detecting. But now I think, with all the advancement in current tech. (Just like cell-phones, T.V."s etc.) many detectors seem to be around the 14kHz range, give or take, as your Gen. purpose coil. Higher or lower, might be used for "Target Specific" type of hunting, High kHz for say small gold, Low kHz for say Silver. As for iron, many detectors will have a "Iron Cancel" type of thing, it helps a lot, but is not fool proof. Many on T-Net has had great success with something around 14kHz, and again Iron? It can be eliminated, unless your relic hunting, then it can be used as a good tool I believe. In general hunting, I think you'll find more with something around 14kHz.

 

[Tony (Michigan)]

Interesting, sprailroad, that the Silver µMax operates at 10 kHz.
The Detech relic detector operates at 4.8 kHz and punches deep into the ground.

They are in Bulgaria. I used Google Translate to translate this:

The Detech Relic Striker is a 4.8-kHz monofrequency VLF / IB equipped with a 18 "x15" (18"x15")
Symmetric Electromagnetic Field (SEF) mastodontic plate. These first information, read by a search
engine with a pinch of technical knowledge, are indicative of a more focused detector in search of highly
conductive metal objects (copper, bronze and silver), of not too small dimensions, at remarkable depths
and capable of To penetrate mineralized soils.

 

[b3y0nd3r]

Tony there is a lot of mis-information here. While it is true that lower frequencies hit better on deep silver, higher frequencies work better at unmasking in iron. I once ran a White's V3i in the 3 khz and it read surface foil like it was silver. As for the whys, that is an in depth discussion for next time. If you have to choose just one frequency out of the three you mentioned, go with 14khz as it is a decent all around frequency. As for this statement you made:

"Wouldn't the lower 4 kHz be less succeptible to iron nails and rusty bottle caps?"

Short answer is NO. But it is susceptible to Iron falsing(an iron object begins to decay when it is underground and the small iron particles that collects at the tips(for a nail) reads like a high conductor)

"But the trade off is wouldn't it be more succeptible to pieces of aluminum foil?"

On the surface yes because this acts just like iron falsing.

"Of course it would be hotter on gold."

It would be the worst on gold. High frequency works well with at detecting materials in the low conductor side.

 

[oldkoot]

The higher the frequency the more sensitive a detector is on smaller non ferrous targets I:E Gold,Aluminum Foil,Lead bullets,Brass items that's why detectors like the new GM 1000 is at 45 kHz,one of the Gold bugs is 71 kHz and the whites GMT is at 48 kHz,they see smaller non ferrous better,at 4 kHz a detector will see larger non ferrous at depth,but will also see coins and iron and like b3y0nd3r said the 14 kHz would be a better all around frequency

 

[cudamark]

Or get a Minelab FBS machine and have 28 frequencies!