A Question and My Take on Noise Cancel

[RLOH]

I have had Explorers of some kind since they came out and can remember lots of chatter about noise cancelling. To be honest, I never truly understood what noise cancelling actually does. The book says to hold the coil off the ground and noise cancel. The book also says it will automatically pick the 11 clearest channels. Does this mean the clearest frequencies? If this is true, you are now using an 11 frequency detector instead of 28 frequency. For most of my time using an Explorer, I did not noise cancel. The only time I would noise cancel was if I encountered emi. I never noticed any difference whether I noise cancelled or not.

Recently, I have been noise cancelling every half hour or so. When I make some good finds, I go into options and see where the noise cancel has set the detector. It seems that the magic number for making good finds is "7". When I turn on the detector and I don't noise cancel, I will check the noise cancel setting. It seems to be "7". Is this the factory default or is it the last setting from the previous hunt?

Today, I manually set the SE Pro to 7 and had some success. The initial noise cancel set the detector to "1" . I found two deep Indians from a spot I have hunted dozens of times.

I never worried about noise cancelling, but would appreciate if someone can explain it in more detail. Maybe my theory is lame. I have had too many days when spots I have hunted hard produce numerous good coins. I always attributed these finds to my expertise LOL, but maybe there is more to it.

 

[IDXMonster]

I’ll type out the whole thing when I get home if someone doesn’t beat me to it.

 

[IDXMonster]

No takers? Ok, let’s go....

SUPPOSEDLY!...and this is taken from what I understand and have read in literature....28 frequencies are transmitted at once, but most of them are HARMONICS of 2 or 3 dominant frequencies. No need to explain that further for the question at hand. Noise cancelling will shift that entire set of 28 frequencies up or down by .5-1 kHz at a time. So you have 11 SETS of 28 frequencies at your disposal, depending how the machine is feeling. If you were to do a “factory reset” of your machine, you would see that the channel chosen will be 6. You might be seeing 7 because that’s what it was on when last shut off. After a reset(completely back to factory settings) you should see channel 6 to start with. This makes sense, and is likely the specific set of frequencies the machine would use IF the ability to shift them around was not available. From 6, you can shift UP 5 or DOWN 5. The 28 frequencies are still being employed no matter what channel you’re on, just shifted slightly to try to avoid those sources of EMI which can interfere with stable operation.

 

[RLOH]

Thanks for the explanation. I was completely off base with my interpretation of noise cancelling. Ray

 

[BigTony]

Interesting but don’t wait 30 minutes to perform noise cancel.
If you feel you aren’t getting clean signals then it’s possible that the ground has changed and you should perform noise cancel.

Tony N.J.

Ps: glad you handled that one IDX

 

[IDXMonster]

Interesting but don’t wait 30 minutes to perform noise cancel.
If you feel you aren’t getting clean signals then it’s possible that the ground has changed and you should perform noise cancel.

Tony N.J.

Ps: glad you handled that one IDX

Tony....To add, noise canceling ONLY has to do with EMI(sources of electromagnetic interference) and does not involve ground conditions. The ground mineral is handled by an internal tracking system which is not anything we as users can adjust. Just FYI...

 

[BigTony]

IDX, you are right, my mistake.

If my machine doesn’t act accordingly then I hit noise cancel and am on my way.

Tony N.J.

 

[IDXMonster]

IDX, you are right, my mistake.

If my machine doesn’t act accordingly then I hit noise cancel and am on my way.

Tony N.J.

You are not completely mistaken Tony, and we have to be careful...when you have power lines and infrastructure BELOW GROUND, it CAN make it appear as though you might have bad ground, and noise canceling would cure this. The key is, the coil must be SITTING STILL to test this. If it’s just sitting there and still carrying on and making noise with NO coil movement, this is an EMI issue. They can be and often are mistaken for one another, but like you said...just hit noise cancel to be safe. The next step to tame too much chirping and false signals would be to lower the sensitivity....or go somewhere else. A smaller coil might also help with EMI, but is counter-productive when it comes to achieving maximum depth obviously.