GPX 6000 - Emi Troubles - Some Data For Minelab?

[Gold Catcher]

Interesting. I will have the 14DD handy....

[Norvic]

Ok, yesterday whilst detecting I had an irregular event for my remote area, a light plane went over at probably 1000ft, sight seeing I suspect. My 6K went totally unstable, so leaving it on no adjustments, coil on ground I had a spell and observed once the plane had moved on the 6K quietened down and I carried on for rest of detect. Unusual I've not experienced a detector react to such in such a way before, but it gives me an appreciation more of a detecting environment a lot are in everyday.

[Jonathan Porter]

The 6000 is extremely wide band width, but I’m surprised a light plane at 1000 foot could set if off that bad. Fences can also be problematic (not as bad as a 5000) but fences will cause some irregular jitter when you get too close. The key is to keep the coil as flat as possible during periods of instability. 

[Bishop]

Aircraft have transponders.  radio transmitter-responder. to assist in identifying them on air traffic control radar.
detectors pick up the signal.

as long as im posting, here is a pic of today's gold.

[Norvic]

JP I am assuming it was the plane, no fence was within cooee or anything else that I was aware could set off the 6K, stability returned once plane was well past, experience I`ve not noted before thus plane could have had some unusual electronic gear on board. I know helicopters much closer have no effect as my backyard have them going over daily during winter delivering tourists to the resort properties and chasing poachers, they come in pretty close to identify non-poachers. Keeping the coil flat and close to ground did not help as that is normal for this old codger, especially yesterday as I was having a productive day, mobile phone on as per norm. w/. Oziexplorer for tracking/waypoint saving and not in aeroplane mode.

Please note I am assuming it was the plane, be only if more times this occurs can such an assumption be verified, I too was surprised.

[Skookum]

Mine still protests with every airliner overhead, but it’s usually only about a minute of waiting or so, which isn’t intolerable. On a related note regarding EMI, we experimented with two 6000s, today. The 11 inch coils managed alright as long as they were kept 20-30 feet apart. We did not run that experiment with the 14 inch coils.
Later on, we did put on the 14 inch just to listen the threshold and test the sensitivity to some of the smallest nuggets. Even in Auto 1 Difficult EMI Cancel mode there was some mild interference chirping along with the other machine off. Unfortunately, I didn’t remember to flip the headphones back on. With hindsight, I’m suspecting the speaker was the cause. Always curious to hear anyone else’s results as they come in. 

[oneguy]

Been running mine in manual 1 and 2 with intermitant emi as usual...able to work around the emi in my area with some agravation on my part...lol.  Tried my corded sennhauser headphones and didn't notice any difference so went back to the speaker.  I have noticed in my area some planes cause emi issues and some don't...????

[Skookum]

 

2 hours ago, oneguy said:

I have noticed in my area some planes cause emi issues and some don't...????

I don’t recall the exact equations from the college physics days, but I’d bet interference is governed by an inverse squared law regarding distance.  Perhaps altitudes used nearer to metro areas are in a whole different league than cruising altitudes with regard to EMI. But, I respectfully defer to any physicists or engineers.

[rvpopeye]

I would think some planes have differing amounts of EMI depending on the composition of the construction too. Like wi fi works poorly in my RV..