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Dominant 22.5 coins in 3 freq. Best Data?

B

BHNugget

Member
Ive seen posts saying that the 22.5 is hitting deep coins very good and was wondering what everyones experience is that has had this happen to them while in 3 freq. best data?
I havent had it happen to me,but then I havent made it a habit of digging deep 22.5 hits while looking for coins either,I figured they were probably bottle caps or such.
 
All my coins deep or shallow have all hit hardest with the 2.5 KHz and the 7.5 kHz a close second on the really deep ones. The 22.5 kHz barley registered on a 9" dime. I don't get the whole 22.5 KHz for coins. There is a reason whites engineers chose the 2.5 kHz frequency for the deep silver and chose the 3 kHz frequency for the dfx. The people I have seen that claim the 22.5 KHz hits harder on coins seem to back this claim up with shallow clad finds ??
 
There's a topic on the Whites forum in the V3 section...looks like the story is "it depends on your soil conditions". I find myself wondering why the principles regarding frequencies are all of a sudden different for the V3. I can easily accept that this might be true for certain locales, but overall it flies in the face what you would expect.
 
22.5 hits best on low conductive metal. Nickles and small gold.
 
woodchiphustler said:
22.5 hits best on low conductive metal. Nickles and small gold.
Click to expand...

On this side of the pond 2.5 Khz would be best for coins in normal ground conditions, but if I were in England or other European countries, I would certainly think about the 22.5Khz. Hammered silver (and of course gold) would definitely be more sensitive to the higher frequency.
 
Woodchip...I just returned from 8 days detecting in England and used 22.5 exclusively. Results: 9 Roman silver, 2 brooches, a Roman and Viking, 2 Medieval seal matrix's, 3 groats and a few cut coins, also got an Alexander, I think, of Scotland hammered silver. Countless buttons and greenies. All in all it was a great trip for me.....Heading back next year.....Jim
 
22.5 is the dominant freq here (in the norcal bay area) on deep coins. To make things even more confusing a coin in the 5-6" range is sometimes be dominant in 7.5. To clarify, on deep coins blue (22.5) will be the longest line on pinpoint. I can't give any input on the dominant frequency in analyze mode on deep coins here because in the 6"+ range my analyze mode simply fails to work at all - I believe all of this to be due to very high mineralized soil in our area.
 
RacerX said:
e in the 6"+ range my analyze mode simply fails to work at all - I believe all of this to be due to very high mineralized soil in our area.
Click to expand...

I think this may be the case across the board. Unless the signal is strong, you need to work very hard to get an accurate graph in the analyze mode. My advice, rely more on your ears, and your experience than the analyze screen.
 
woodchiphustler said:
22.5 hits best on low conductive metal. Nickles and small gold.
Click to expand...

I think that's that point...what you say is what White's says and is what general knowledge supports. Why does 22.5 hit stronger on deep coins in the US in some areas, as has been reported? If this is so, and I have no reason to doubt these people's experience, then why didn't we use 15KHz on the DFX for deep coins (I know 15 is quite a ways from 22.5, but both are high in the general purpose detector world)?
 
The Beep Goes On said:
woodchiphustler said:
22.5 hits best on low conductive metal. Nickles and small gold.
Click to expand...

I think that's that point...what you say is what White's says and is what general knowledge supports. Why does 22.5 hit stronger on deep coins in the US in some areas, as has been reported? If this is so, and I have no reason to doubt these people's experience, then why didn't we use 15KHz on the DFX for deep coins (I know 15 is quite a ways from 22.5, but both are high in the general purpose detector world)?
Click to expand...

I'm guessing the 22.5 being the dominate frequency is the exception not the norm it certainly is not the case for me in my area and that's why I think whites chose the 2.5 for the V3 and the 3 for the DFX for the deep silver programs.
 
For me in my ground 2.5 hits the hardest for deep silver and coppers. I didn't do any measuring in the different frequencies, I'm going by the length of the bars in pinpoint.
 
Thats basically what I go by Larry,but Ive noticed on some targets,and I cant remeber what they were,when pinpointing showed a dominant frequency but changed as I dug closer to the target.Ive also had a dominant frequency in pinpoint,but had the analyze show a different dominant frequency before digging.Have any of you experienced these circumstances in your ground?
 
22.5 is the way to go on cut coins , small roman and hammered.
 
woodchiphustler said:
22.5 is the way to go on cut coins , small roman and hammered.
Click to expand...

I agree - 22.5KHz is very sensitive to the thin stuff, but I have had (shallow) very small hammereds using a modified Hi-Pro setup.
 
Best frequency is determined not only by metal content, but also size & thickness. For thicker coins with high silver content (US silver), there is no question that 2.5kHz will hit harder than 22.5kHz. For US nickels (even though they are 75% copper) 22.5kHz will hit hardest. 22.5kHz may also work best on small thin coins, even those with high silver content, due to skin effect. High frequency may also work best on low silver content coinage. 7.5kHz is typically better on copper coins.

In short, test the detector for the items you want to find. If all you want is US silver, then you should use 2.5kHz. If all you want are thin gold rings or small nuggets, then select 22.5kHz. If you want hammered silver, then test a typical target and see what works best. If you want best depth on a wide range of targets, use 3F.

- Carl
 
Hmmm, so you're saying a US silver dime should pinpoint with 2.5 as the dominant bar always?

Would you believe me if I made a video of the silver dime in my test garden hitting best on 22.5? :detecting:
 
RacerX said:
Hmmm, so you're saying a US silver dime should pinpoint with 2.5 as the dominant bar always?

Would you believe me if I made a video of the silver dime in my test garden hitting best on 22.5? :detecting:
Click to expand...

I don't think he said always. And this from Carl's first paragraph " 22.5kHz may also work best on small thin coins, even those with high silver content, due to skin effect. " He also stated thicker U.S coins. Although in my area silver dimes hit harder on 2.5 but I would guess the silver dime could go either way depending on depth,angle, and how thin its been wore. It also seems to depend allot on peoples ground conditions.
 
None the less,Id love to see the video Racer.At what depth in your area do you see the dominant freq. go from 2.5 to 22.5?
 
On the Whites forum the 2 guys have very mild soil. One of them is in mineral free Florida. Both of these guys used the 15 khz with the DFX for coins so the V3 isn't different. They preferred the high frequency on both detectors. Rob
 
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