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EMI Question

E

Elton

New member
I have detected for years....... Used Whites, Fishers, Garrett's, Minelabs, Tesoro, Treasure Barons, and others.................. Up till a few years ago I never had EMI Problems.


What's changed ?? I have issues in many places with the newer detectors........... What have they added to the detectors, or removed that was on the Older model Detectors... My OLD, OLD XLT still detects about any place I take it....... My Minelab does well too, but on occasion you get EMI with it.... Fishers and T2 are subject to heavy EMI interference.. The new V3i I bought has same issues of EMI.. So did the F75 LTD it was terrible in a lot of areas with EMI......

Has to be an answer that I'm possibly over looking.......... Were we oblivious to EMI in past years, and just worked through it ??? Was EMI Not an issue a few years ago ?? IS it a new awareness we
just learned from reading others posts and we blame everything EMI ... :help:
 
EMI is hard to ID and I don't experience much of it out in the rural areas where I live and hunt most of the time but I do run into it more in the cities. The big change in the last 5 years or so is the amount of wireless communications going on from computers (Wifi) to cell phones and even TVs. I don't know if this has any effect on our detectors, but there seems to be a lot more cell towers everywhere now.
 
Also some detectors and or coils are not shielded very well (Even some Newer detectors) or at all and IT DOES make a difference! The control boxes should be shielded as well as the coils and any other electronics as well.There is NO EXCUSE why today's modern detectors can not be shielded especially since most of them are digital.Most of the control boxes on newer detectors are not shielded at all and even some of the cables have poor shielding.

RonK
 
Like I said..it sure has become an issue. I hope the companies take notice and address the issue. I hunt city areas and wow.. it's getting bad.
 
n/t
 
Here's part of the problem. Every wire and conductor, even the shield, is an antenna. Now shielding when there's an earth ground is easy but we don't have that option. Dealing with it without that earth ground is more difficult. With the number of wireless routers, cell phones, power lines, etc. growing constantly we live in a soup of em signals across quite a spectrum. I guess I'm lucky as both my detectors handle it well.

Since many of us don't get to hunt way out away from humanity I'd say it's going to only become a bigger issue for the folks who design and build these things.
 
Here is something else I forgot to add.Most of the detectors that I have had with a metal control box Never had EMI problems anywhere or very little.It was very rare to have any kind of problems with my metal control box detectors but most of them were analog which is quieter than digital.I understand what you are saying about the shielding and other components in side the box but I shield electric guitars and that really cuts down on the noise.I use copper tape most of the time but it also has the advantage of and earth ground as you mentioned but even so....It still cut the external noise quite a bit.A properly designed detector can be made with better shielding than what some are building today.I realize using a metal control box can get a little heavy but that alone will cut back on some of the EMI but not all.If they build the coils and cables with better shielding it will also help..maybe not 100% but it will help to a certain degree.Another thing is today's detectors are mostly digital and that always adds to the problem of picking up unwanted EMI.Even noise generated by the digital circuit itself can cause extra noise.Nothing is perfect but I still believe they can build better shielded detectors than what they are now and cut back on more of the noise so we can run higher gain.Why even build a higher gain detector if we can not take advantage of it and have to run at very low gain just to get it stable? Also sometimes certain frequencies can be quieter depending on design and mode used.Well I'm out of here for now before I make someone mad at me!

HH!
Ronk
 
Gonna agree with Ronk. My White's Silver Eagle (aluminum housing) is much more resistant to EMI than the all plastic housing detectors I have used. Aluminum blocks EMI to a significant degree. That's why it is used as shielding in wire.
 
Well, I'm going to politely disagree. There is nothing special about aluminum for blocking emi. We use shielded wire all the time in my business and none is aluminum and without the shield being earth grounded it doesn't work anyways. Any metal can shield but ONLY if it is well grounded to earth. No earth ground, no shield. Your machine does so well because of it's design, not the case.

Both of my detectors have plastic cases and have no trouble with emi.
 
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