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By Steve Herschbach
What we are discussing is usually called "Recovery Speed" by most manufacturers. From the White's XLT User Manual:
"Recovery Speed - Speeds target responses, so several targets that are close together can each respond.
When a metal is detected, it takes a fraction of a second for the detector to process the signal before it can respond to another metal target nearby. The time it takes to process the first metal target signal so that the second metal target signal can respond is called RECOVERY SPEED.
There are advantages and disadvantages to fast (high numbers) and slow (low numbers) RECOVERY SPEEDS. Faster RECOVERY SPEEDs work well in high trash areas. However, they will have some difficulties with very deep targets as well as double responses on shallow targets. Slower RECOVERY SPEEDs do not work very well in high trash areas. However, they will have better responses on very deep targets. Slower speeds also have more definitive discrimination sounds. A custom setting needs to be found that suits the preferences of the individual and the conditions in the area. As a general rule, the closer together the metal targets are in an area, the faster the recovery speed should be. The more spacing between targets, the slower the speed should be. Don't use the fast speed if you don't need to.
In very trashy areas it is recommended to switch to a loop smaller in size than the standard 9.5 inch black loop. Smaller loops offer better separation between targets. However, larger loops detect deeper and cover more area with each pass. RECOVERY SPEED combined with a smaller loop can be used to search severely trashy areas."
Just to confuse people White's decided to call it "Recovery Delay" on the V3i. A low recovery delay equates to a fast recovery speed.
From the White's V3i User Manual:
"Recovery Delay - 1 – 200 200 = slowest. Additional and separate (beyond filtration) selection for the signal response time. Short response time benefits performance in high trash by providing better target separation. A longer response time allows a larger window to detect deeper targets. Ideal Recovery Delay is dependent on Ground Filter selection, ground mineralization, trash density, and your average sweep speed (how quickly you move the search coil)."
It would seem detector manufacturers abhor standard terminology, even the same manufacturer! XP has decided to call Recovery Speed by an even newer term - Reactivity. From the Deus User Manual:
Regarding the VLF detectors.Can someone answer for me what constitutes a VLF with good discrimination?.I feel to discriminate that speed is a factor as well.Otherwise no matter how good,if a target is next to iron it will read off a good hit.
The Deus has fast reactivity,so is this now a good discriminator.Between ferrous and non ferrous?. How does this compare to say the Nokta Impact for speed discrimination.
Thanks in advance
While looking around on the Minelab site I came across this article by Bruce Candy. It will certainly be a re-read for some but for me it was a first.
There is much more than just Minelab in the article. It included ground balancing, discrimination, gold detectors, coin detectors and a host of other related issues with knowing some of the technology about target detecting.
It doesn't yet include ZED technology but does explain why it is so hard to have a gold detector that discriminates. (When you discriminate you lose targets!)
By Steve Herschbach
This is an informal survey, just out of curiosity. For those of you who have been out prospecting in the last year (back to Sept 2014) and actually have found gold nuggets, what detector or detectors did you find the gold with? The poll is not meant to prove anything. I am just wondering what detectors are most commonly in use now for finding gold nuggets by those who are actually finding the gold.
I am posting this on the most of the active US forums so please do not post your answer in more than one place. In a week I will compile all the answers from all the forums and post the results back to each one. Thanks in advance for you participation.
I own a number of units but so far in the last year my gold was found with the Minelab GPZ 7000, SDC 2300, and a few nuggets in trashy areas with the Makro Racer.
Hi Steve, please I need your advise on the detetctor that I just ordered from China, Nugget 9.5inch, waterproof coil with 9.6khz. Its sold by Chinavasion. I actually ordered before getting to know about this site of yours and as someone with little or no knowledge about the detetctor, I go for something cheap and also with a reasonable depth. The depth of this machine is 3.5m. I am writing this because I could still cancel the order if I know it won't be functional. I also noticed yesterday that most of the detectors from US give 5yrs warranty while this one gave just 1yr warranty. Please kindly advise. Anybody else could give helpful hints. I will also like to know what the FREQUENCY rating means to a detetctor. Thanks