Hello everyone yesterday i was detecting and was not going well, i decided to make some tests , i buried a thick copper coin about 6 inches, me settings were, ferros , sensitivity 30, zero descrimiation,and combined, the ctx would not find the coin. The only way it would detect the coin is passing the coil really but really slow but i mean really slow, what am i doing wrong ?
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Need settings for depth!
- Thread starter MEV
- Start date
IDXMonster
Well-known member
Stock 11" coil Manual Sens at 30? Something isn't right...
Jason in Enid
Active member
the problem is you are trying to detect a freshly buried coin! You have to give the ground time to re-settle and compact with good contact on the coin.
think of the ground like an insulator. If a material is dense, engery passes through it easy. If you make it less dense, the energy doesn't have a solid path and does not travel as far. Your detector coil is putting out radio wave energy and listening to radio wave energy. If that energy has a harder time getting down to the coin, its going to have a MUCH harder time coming back from coin because there is so much less power to start with.
Go out and water your buried coin. stomp on it, jump on it, water it some more. give it a few months and then see what response you get.
think of the ground like an insulator. If a material is dense, engery passes through it easy. If you make it less dense, the energy doesn't have a solid path and does not travel as far. Your detector coil is putting out radio wave energy and listening to radio wave energy. If that energy has a harder time getting down to the coin, its going to have a MUCH harder time coming back from coin because there is so much less power to start with.
Go out and water your buried coin. stomp on it, jump on it, water it some more. give it a few months and then see what response you get.
GKMan
Well-known member
A freshly buried coin will be picked up by the detector a six inches, especially if he is running at 30 and even more likely if it is a thick copper coin (large cent?). Now you can swing too slow to possibly not hear a deep coin, I have been over that in other threads. What about in pinpoint MEV?
Jason in Enid
Active member
GKMan said:
You are making assumptions about his soil mineralizations, and his local background EMI. Just because a 6" coin is easy to detect for you doesn't necessarily mean the same for him.
Search and recovery
New member
If he can run sensitivity at 30 and the machine is running fairly stable, then I would make the same assumptions that he should be able to detect such large coin at 6". A simple noise cancel should get rid of the worst of EMI. Something is not right. Try burying coin in another spot and repeat the test just to be sure that there was nothing in the ground that could interfere with the coin signal. Try auto sensitivity and see what the machine is recommending. Lower numbers mean worse mineralization. When you say that the machine could not detect the coin, do you mean no signal at all, or a low skewed signal? Just trying to figure this one out.
I had an issue like this last year and I do believe it has to do with it being a fresh bury, but one other thing I hadn't even considered until somebody mentioned it to me was making sure the coil was screwed in the whole way. I typically would only screw mine in a few turns - just enough to keep it from coming loose. Turns out it was limiting my depth. I screwed it all the way in tight and it increased my depth immediately.
Umm what does the CTX do with the coin in an air test?
All of the standard config modes with default settings should find it.
If not, try an alternative coil.
If it works ok then the soil is highly mineralized. I would think it would still work though - but if not, try setting NC manually to 11.
If EMI noise, live with it and see if it works. Drop Sens back manually as an experiment, but not less than 21.
As suggested above your ground balance could be enabled and screwing you up. It is kind of tricky the way it has to be set for disabled.
All of the standard config modes with default settings should find it.
If not, try an alternative coil.
If it works ok then the soil is highly mineralized. I would think it would still work though - but if not, try setting NC manually to 11.
If EMI noise, live with it and see if it works. Drop Sens back manually as an experiment, but not less than 21.
As suggested above your ground balance could be enabled and screwing you up. It is kind of tricky the way it has to be set for disabled.
Try a manual NC setting of 11 - or let us know what auto NC comes up with. If a low number it seems to cut out some targets - especially in ferrous mode like you are.
Try playing with a bobby pin, ferrous mode, and NC manually 11 down to one - wait several seconds for the setting to take. I found that 11 seems most open and 1 most restrictive.
The other suggestion is just find another CTX to compare to as it is a quick test.
Another thing - try boosting Audio Gain up to 30 or so.
Try playing with a bobby pin, ferrous mode, and NC manually 11 down to one - wait several seconds for the setting to take. I found that 11 seems most open and 1 most restrictive.
The other suggestion is just find another CTX to compare to as it is a quick test.
Another thing - try boosting Audio Gain up to 30 or so.
I would take a look at where you are doing your test and try a different spot as the CTX should do about three times that depth. As well it will always go deeper the less reject you use--as with any detector. A Sensitivity of "30" is too high as well--interference from nearby power sources will create noise that will prevent the machine from hearing targets. "22" is a good setting to see what this machine will do. Slow your sweep down. Try some air testing on a bench with the coil suspended away from any metal. This will give you a better idea of what to expect in the field.
cjc
clivesgoldpage.com
cjc
clivesgoldpage.com
Thought of a couple other possibilities:
1) you might not be able to hear the detect frequency as well as other frequencies. I've read that some people have notches out of their hearing, so might be a good idea to try several different types of targets at that depth to see if some you hear and some not - look at the screen to see if all are detected but just don't sound off well.
2) Check to see what your Volume Gain is set at. Try boosting it up to 30 for this testing. If too low level, deeper targets could get missed. What headset you use could make a difference here too.
1) you might not be able to hear the detect frequency as well as other frequencies. I've read that some people have notches out of their hearing, so might be a good idea to try several different types of targets at that depth to see if some you hear and some not - look at the screen to see if all are detected but just don't sound off well.
2) Check to see what your Volume Gain is set at. Try boosting it up to 30 for this testing. If too low level, deeper targets could get missed. What headset you use could make a difference here too.