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Weird noise on E-trac when coin gets farther from coil

D

DigDugNY

Member
Hey guys, I noticed something while out detecting the other day and decided today that I would just wave a quarter in front of the E-trac. I noticed that once it got past a certain point it would still give a signal, but there was also another sound mixed in with it that sounded kinda like a null, but at the same time had its own quality that sounded as though somebody knocking on a piece of tubing or something . I think I might of heard this sound before on other peoples videos, but at the same time I have seen people get 7-8 inch coins without this happening. I'm posting a video that has the sound and if any of you have an explanation i'd appreciate it. I know i'm waving the quarter pretty fast, but I have gotten this sound while out detecting very slowly and have skipped targets because of it. The targets that I did get this sound with were not really deep, but is there a way I can make those signals clearer? Mind you, I have only had the machine for like 4 months, so I'm still getting used to it

http://www.youtube.com/watch?v=Pz-bdbRMPWE&feature=youtu.be
 
In past posts it is called "the thunk" I hate to tell you how many good coins I have found digging "the thunk" were other minelab users have hunted the same area and ignored.
 
Bobby s said:
Hey guys, I noticed something while out detecting the other day and decided today that I would just wave a quarter in front of the E-trac. I noticed that once it got past a certain point it would still give a signal, but there was also another sound mixed in with it that sounded kinda like a null, but at the same time had its own quality that sounded as though somebody knocking on a piece of tubing or something . I think I might of heard this sound before on other peoples videos, but at the same time I have seen people get 7-8 inch coins without this happening. I'm posting a video that has the sound and if any of you have an explanation i'd appreciate it. I know i'm waving the quarter pretty fast, but I have gotten this sound while out detecting very slowly and have skipped targets because of it. The targets that I did get this sound with were not really deep, but is there a way I can make those signals clearer? Mind you, I have only had the machine for like 4 months, so I'm still getting used to it
Click to expand...

Prep1957 said:
In past posts it is called "the thunk" I hate to tell you how many good coins I have found digging "the thunk" were other minelab users have hunted the same area and ignored.
Click to expand...

Yep. That is what they call the thunk. The real twist is that once you get deeper than the thunk zone, you get a null zone, where the machine detects it as iron, right before you lose the target entirely. Maybe that is what a thunk is, the audible target identification, and discrimination are just starting to fail. The E-Trac is superior at locking target ID at depth compared to many other detectors. I think the dimes drop to zinc and lower at 3+ inches with the F2. My friend has dug silver dimes that registered as zinc at 5" with his XLT.
 
The THUNK is normal. As others has said it's just where your target is almost out of reach. These targets if a coin will be deeeeep. I dig the "THUNK tone" signals.
 
Thanks for letting me know...i definitely have to start digging the thunk signals then. Thanks for letting me know
 
I've found the thunk to be a valuable tool as well.
It doesn't occur with every target , even if you try to raise the coil until it occurs---soil conditions and such must factor in as well as your settings. When I find a target that thunks I have also found I can use it to determine the best settings for optimum depth in that particular area. By changing settings like channels and sensitivity to maximize the depth at which the thunk appears , one can tell they are probably working with the maximum depth they are going to get with their particular discriminator settings.
The process takes a bit of time and is very localised but it can be beneficial. We all like to think we're swinging along getting 10" depth readings but in fact in may only be 6 or 8 depending on the soil. I've found the thunk can at times get me couple of extra inches :yikes:
 
Goes4ever said:
sometimes you will get the THUNK on coins standing on edge as well, and they might only be 5-6" deep
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Thanks for adding that in because I don't think all the thunks I was getting were really deep. I'll just have to dig them from now on
 
and I mean always has a 35 FE number attached. I have dug a number of those and it is always iron. Is your FE number different when you dig good targets?
 
sandnsea49 said:
and I mean always has a 35 FE number attached. I have dug a number of those and it is always iron. Is your FE number different when you dig good targets?
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I don't think Fe goes up to 35...if you mean a co 35 I have gotten indian head pennies with a fe between 12 and 15 with a 35 attached and got indians
 
GroundScanner said:
Fe. goes from 1 down to 35 and Co. goes from 1 to 50
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Oh..I have a lot of the bottom of my screen blacked out.. i barely use quick mask, but I assumed hose higher fe numbers are usually when it's iron
 
Funny reading this post. Ran into it last night. Hit an old 1 room school that I go to that is close to home. Pulled a lot of wheaties and such out. Last night I went to kill an hour and started covering it pretty quick and was not getting anything. Then I slowed way down. Looking for really deep targets. Getting really erratic signals. Sounded really choppy and numbers bouncing and hard to pick up. Decided to dig those and popped out a really deep wheatie. Then another weathie, followed by a deep rosie and an 1899 injun. They were signals that normally I would have passed on. The ferrous number would go as high as 19 and conductive numbers would jump all over and they had a dull sound with an occassional chirp. Anxious to go back now. Learn something everytime I go out.
 
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