what is the best machine for knocking out electrical interference

[skeeter86]

Ok lets take the gloves off and hear which machines are the least to be interfered by ef or if or cell interference.

 

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[Loco-Digger]

I am very please with my F75 LTD SE which was upgraded in Feb 2015. It is very quiet now. I must admit I am not experienced with many brands. My older White's Classic ID also does well in ef areas.

 

[Sandman]

Due to the various quality of components this would be impossible to pick one brand or model.

 

[TabWhisperer]

It depends. I have had detectors go bonkers next to power lines and while others were quiet. Still others that went nuts near cell antennas (or cell phones) while other ones stayed silent. You just don't know. Too many variables with frequencies, power levels and machine sensitivities to them.

 

[Detector Wars]

Plain and simple, any machine with off-set frequencies will do the job.

Minelab Explorers can choose between 10 off-set frequencies, I can always keep mine quiet this way. I would say any FBS machine's the same.

 

[Phantasman]

I am very please with my F75 LTD SE which was upgraded in Feb 2015. It is very quiet now. I must admit I am not experienced with many brands. My older White's Classic ID also does well in ef areas.

Once again, you hit the nail on the head. A detection field is ElectroMagnetic. So how can it really be immune to EM from an outside source? The F75 was prone to EMI due to it's increased depth sensitivity. A rule of thumb would be to eliminate EMI, either turn down the sensitivity (resulting in decreased depth) or get a unit that doesn't have an increased EM field. Fisher solved their EMI problem with the latest software upgrade to not be influenced as much with EMI while maintaining excellent depth. Once they figured it out, they offered the upgrade to past users, a gallant move by them. Has any other company done this? Or do they "let sleeping dogs lie" and what you get is the old design, good or not?

While most detector companies are great in customer service, Fisher/Tek seems to have went one step further, updating previous units to newly engineered specs.

 

[ZR2guy]

The FCC

 

[foiler]

I hunt in urban environment with plenty of EMI. My X-terra 705 has never experienced EMI that it couldn't shift freq. to clear it up. Have never had a problem.

 

[LuckyLarry]

Technically, there is no constant, and various frequencies don't matter much in most cases although they can influence somewhat, because EMF is (inducted) into a circuit or field, so it is not always frequency selective. The best of the lot would be well-shielded to stop the induction, no matter if the frequency is 3 Khz or 75 Khz.

In short, most EMF, RF, or any other force can be inducted into or absorbed into and hopped into or onto any wave form of (almost) any style such as a "clipped", or square, or sine, or switching waveform circuit. "Interference" is not prejudiced, it fits in wherever it wants to, and unless regulated it doesn't care where either. Here is a (simple yet somewhat) example of how it works; this is induction-fed, and the EMF jumps on board from a voltage range of 70-1000V AC (that's a wide range, isn't it?). Non-Contact Voltage Tester ... There are some places where we will get interference no matter which detector we use, or how much it costs. And in the case of the non-contact induction voltage detector here, if it were better shielded it could not get an induced signal. This device is NOT well-shielded and that is why it works, and especially works over such a wide range.

 

[pedrocarlos]

 

[Pennypacker]

I use the Xterra 505, I too have always been able to eliminate interference when encountered by shifting the frequency a bit.