Noise cancel, how do you do it?

[captn_se]

Chris,

After re-reading the E-Trac manual (section on Sensitivity -auto/manual), in addition to Ray's comment posted here, I will state with high confidence that the auto sensitivity function on the E-Trac/Explorers is affected by magnetic ground interference as well as EMI above and below the ground. Magnetic ground interference could be classified as ground minerals, conductive targets, and EMI. So, yes, ground that has lots of trash targets will affect auto sens, as well as highly mineralized soil, and EMI.

HH,
CAPTN SE
Dan

 

[Chris(SoCenWI)]

Dan,

Do you think that running in manual affects the the automatic ground balancing? This is one area I'm not sure how to run a test. Many people have stated over the years that all the noise you hear at high manual sensitivities is due to ground mineralization. I'm not sure if that is true. There are some places out in the boondocks like our cabin where I get tons of signals near a building, but if I get farther away(where nothing has ever been built) things quiet down hugely. Same soil, same settings, just away from all nails and other trash.

Chris

 

[captn_se]

Chris,

Regardless whether you're in auto or manual sensitivity, the ground balance of your E-Trac/Explorer is constantly changing/adjusting to magnetic interference( i.e. ground minerals, conductive trash(iron, aluminum), EMI) you encounter as you swing your coil. The rate at which these machines change update ground balance is probably proprietary, unless you can find it in a patent paper somewhere. Not sure if a ML rep/tech would give out that info. But I do know it is continuously adjusting to the ground changes. So, if you're hunting in manual sensitivity, you have your sens. at a fixed value. AS your ground starts to become more noisy due to one or more of the interference I mentioned above, the ground balancing of your machine will change like it's supposed to, but since you have your sens. fixed (manual), your machine cannot lower the sensitivity (as it can in auto sens.) to keep your machine running stable, and thus it will start to false more, and give you a more jumpy screen and FE/CO numbers.

So the ground balance is always adjusting on the E-Tracs/Explorers to magnetic interference, and we can't change that, regardless if we use manual or auto sensitivity. In auto, we're allowing the machine to keep things stable by properly matching the sensitivity to the changing ground, but in manual, we are keeping the sens. at a fixed value, which could eventually give us an unstable machine.

I imagine if EMI was the only problem you encounter in a given area, then running a high manual sensitivity would be fine because you could just do a noise cancel, and the machine would become more stable then.

Hope that answers your question.

HH,
CAPTN SE
Dan