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am I understanding the noise cancell correct,,,
- Thread starter grouser
- Start date
Jason in Enid
Active member
Thanks for that post Andy! Good to see the advice from someone who has done the experiments and talked to the engineers.
Andy Sabisch
Active member
Ray (and others),
Noise Cancel is a function that does not have a direct correlation to detection depth as the Sensitivity or Gain function does.
The Noise Cancel circuit allows the detector to ignore or at least minimize teh adverse effect of EMI on the signal leaving and returning to the detector providing for more stable operation and less chatter or noise (hence the name . . . Noise Cancel
). If you have not selected the optimal channel for the specific area you are hunting in, your detector will be more prone to chatter / noise which makes it harder to hear the deep or marginal targets we are all hoping to find. But whatever channel is selected will not produce a sharper or cleaner signal on a deep or marginal target by itself.
Detection depth is driven by the Sensitivity level selected as well as the Gain value. Both the manual and my book provide a pretty good overview of how these two functions work and how they should be used in conjunction with one another depending on the targets being sought and the conditions present. Setting Sensitivity too high will not always give you more depth - in fact at times the overload that occurs masks the weaker signals and causes one to continually recheck ghost or false signals costing time and in teh end producing fewer keepers than if it had been left in Auto or at a lower overall value.
Hope this helps
Andy Sabisch
Noise Cancel is a function that does not have a direct correlation to detection depth as the Sensitivity or Gain function does.
The Noise Cancel circuit allows the detector to ignore or at least minimize teh adverse effect of EMI on the signal leaving and returning to the detector providing for more stable operation and less chatter or noise (hence the name . . . Noise Cancel
). If you have not selected the optimal channel for the specific area you are hunting in, your detector will be more prone to chatter / noise which makes it harder to hear the deep or marginal targets we are all hoping to find. But whatever channel is selected will not produce a sharper or cleaner signal on a deep or marginal target by itself.Detection depth is driven by the Sensitivity level selected as well as the Gain value. Both the manual and my book provide a pretty good overview of how these two functions work and how they should be used in conjunction with one another depending on the targets being sought and the conditions present. Setting Sensitivity too high will not always give you more depth - in fact at times the overload that occurs masks the weaker signals and causes one to continually recheck ghost or false signals costing time and in teh end producing fewer keepers than if it had been left in Auto or at a lower overall value.
Hope this helps
Andy Sabisch
Myownwings
New member
I would also thank Prep1957 for getting us all to question what we all thought we knew.
Thanks Andy for taking the time to post I live about hour away from Downers Grove and work in that general area, a few months back I seen a very familiar logo on a persons shirt had a very nice lunch and informative meeting with the person who could not endorse your books but he would say they were quite accurate.
So I'm still very currious about the 28 frequencies, what each one is, and how the ET lumps a select few of these frequencies into their channels. Is this "lumping/selection" a constant, or hard coded into each channel, or does the ET dynamically assign a few frequencies per channel based on some sort of intelligent algorithm? If hard coded per channel, and the math is simply selection of 2 frequencies per channel, does anyone know what frequencies are per channel?
I'm new to this hobby, and see the beauty of letting the detector choose what channel is best based on different ground makeups, but I wonder if the channels were hard coded to frequencies, and it was clear what frequencies were being used per channel, the user could override selection of frequencies by mannually selecting a specific channel, and thus hunt specifically for gold, silver etc.
I'm new to this hobby, and see the beauty of letting the detector choose what channel is best based on different ground makeups, but I wonder if the channels were hard coded to frequencies, and it was clear what frequencies were being used per channel, the user could override selection of frequencies by mannually selecting a specific channel, and thus hunt specifically for gold, silver etc.
Jason in Enid
Active member
lomoch, what you asked is largely a company secret. They won't tell exactly how the detectori operates to prevent other companies from copying it. The owner's manual gives about all the info you are going to get on the subject.
Andy Sabisch
Active member
Terry (and others)
Please read the post entitled "Noise Cancel versus Depth" below. As I said, the Noise Cancel function provides stability by eliminating or reducing the effect of EMI. If the unit is more stable, you can pick up the fringe targets easier but it will not give you any more detection depth.
Try searching an area that you have given up on with a markedly lower sensitivity setting as there are times where you can pick up signals that would have been missed to the processing at higher levels . . . . Bryce has posted this a number of times. Also, if you have pretty much depleted an area, try pushing the Sensitivity to the point teh machines almost reaches the point of instability and if you can deal with the noise, you will get the last bit of detection out and see what turns up.
Remember though that old coins are not always 10"+ deep. I have hit sites that had a hard pack layer which held coins from the mid-1800's at the 6" level and then other areas that say get flooded an a regular basis have clad coins at 12". If your targets are not that deep, a smaller coil, patience and picking through the trashy sections will pay off over trying to get 12" on a dime.
Andy Sabisch
Please read the post entitled "Noise Cancel versus Depth" below. As I said, the Noise Cancel function provides stability by eliminating or reducing the effect of EMI. If the unit is more stable, you can pick up the fringe targets easier but it will not give you any more detection depth.
Try searching an area that you have given up on with a markedly lower sensitivity setting as there are times where you can pick up signals that would have been missed to the processing at higher levels . . . . Bryce has posted this a number of times. Also, if you have pretty much depleted an area, try pushing the Sensitivity to the point teh machines almost reaches the point of instability and if you can deal with the noise, you will get the last bit of detection out and see what turns up.
Remember though that old coins are not always 10"+ deep. I have hit sites that had a hard pack layer which held coins from the mid-1800's at the 6" level and then other areas that say get flooded an a regular basis have clad coins at 12". If your targets are not that deep, a smaller coil, patience and picking through the trashy sections will pay off over trying to get 12" on a dime.
Andy Sabisch
Andy Sabisch
Active member
If one is really interested in determining what level of EMI might be present, you might consider ordering one of these nifty gadgets . . . . . if nothing else it would get some attention in the local park no?
Thought some humor might lighten up the forum . . . .
Andy Sabisch
Thought some humor might lighten up the forum . . . .
Andy Sabisch
Andy Sabisch
Active member
n/t
