Noise cancel.

[Eddie in Poulsbo]

What is to be gained by holding your detector 12" above the ground when you noise cancel? I haven't read in either of my Explorer handbook or in Andy Sabisch's book that you need to hold your detector 12" above the ground when noise canceling. I always noise cancel before detecting making sure that the ground under my coil is clean, but have always just had my coil sitting motionless on the ground. Am I missing something here or is it that the E-Trac users are doing their noise cancel 12" above ground? Are you gaining more depth by doing this? Comments please. HH.

Eddie

 

[Andy Sabisch]

The E-Trac manual does recommend that you hold the coil motionless off the groun d and do a noise cancel. Most of us have done it on the ground since day one.

Try it both ways and you will find that 90% of the time the selected channel is identical . . . . . and the other 10% of the time you will get a slightly different channel if you try it a few times on the ground or in the air.

The trick is to keep it adjusted by routinely using the Noise Cancel feature . . . . . if the ground conditions change (look at the soil), you start getting excessive chatter from EMI or even on a set frequency say 30 to 60 minutes.

Target ID can be affected by not having the proper channel selected . . . . .

Andy

 

[Rigit]

Page 17 E-Track user guide, not sure how much the 12" thing matters

What is to be gained by holding your detector 12" above the ground when you noise cancel? I haven't read in either of my Explorer handbook or in Andy Sabisch's book that you need to hold your detector 12" above the ground when noise canceling. I always noise cancel before detecting making sure that the ground under my coil is clean, but have always just had my coil sitting motionless on the ground. Am I missing something here or is it that the E-Trac users are doing their noise cancel 12" above ground? Are you gaining more depth by doing this? Comments please. HH.

Eddie

 

[James N.D.]

When I first got my Explorer XS back in 2001, I Noise Cancelled like you do, on the ground motionless, making sure that there wasn't any metal under the Search Coil. I did fine doing that way.

Now I hold the Coil up in the air about 12" and hit the Noise Cancel Button. I look around to see if there is any Transformers nearby and if there is, I point the Detector in that direction. I think by doing it in the air, it helps knock out Electrical Interference that is above ground better than doing it on the ground, thus why some of us do it in the air. I did see an improvement with stability of the Detector when Noise Cancelling in the air and that is why I do it now. The Detector ran smoother it seemed and the chatter would be less when I first tried it.

But I also think that if there is buried Cables that are causing Electrical Interference, then doing a Noise Cancel on the ground maybe better to rid the Detector of this, since it is coming from the ground and not the air.

Whatever reasons a person does it, either in the air or on the ground, the Detector will run as smoothly as possible and if it still doesn't, then your Sensitivity is too high and will have to be dropped until the Interference isn't bothering the Detector anymore.

As I have been doing a few boulevards lately, I have had to drop my Sensitivity all the way down to at least 14 and sometimes 12 using Manual Sensitivity since Auto still would chatter a bit this high.

Hope this gives you any idea as to why some use Ground Noise Cancelling and some use Air Noise Cancelling. Just my thoughts on this! Good Luck and HH.

 

[Eddie in Poulsbo]

Thanks James. Another reason I asked was a while back I was detecting this ball field where I use to work and it seemed that no matter how I noised canceled I was getting a terrible amount of interference. I really wasn't that familiar with my XS back then and just gave up. Now maybe with your help I should go back and try what you do and who knows what I might find. Thanks James. Did you get my last PM to you? HH.

Eddie

 

[Eddie in Poulsbo]

Thanks Rigit. I don't own the E-Trac and you answered my question. HH.

Eddie

 

[Eddie in Poulsbo]

Thanks Andy. I have done the on the ground method, above the ground and even holding my XS straight our from my waist. I firmly believe that noise canceling is very important and even when I move to a different area a couple of hundred feet or so I noise cancel once again. HH.

Eddie

 

[James N.D.]

n/t