aksafari Posted May 11, 2011 Report Share Posted May 11, 2011 Has anyone here tried wrapping extra coil wire through a large ferrite ring instead of winding it around the shaft, then securing the ring to the shaft so it doesn't move? The coil wires are shielded, so it THEORETICALLY shouldn't make a difference, but with sensitive electronics and precise timing, maybe some ground shield interference canceling would have interesting results. At the least, it might make a fun experiment. Or maybe try the two-piece snap-on ferrite cylinders. Link to comment Share on other sites More sharing options...
kamikaze Posted May 11, 2011 Report Share Posted May 11, 2011 It might work but iirc it's purpose is more to reduce transmission of emi rather than receiving of... There are ferrite beads of various values that would fit the cable nicely. Mind you installing the wrong value could actually increase emi output... Link to comment Share on other sites More sharing options...
pkirkll Posted May 16, 2011 Report Share Posted May 16, 2011 Dave Lester a ML dealer in Congress has had them in stock all year. Link to comment Share on other sites More sharing options...
aksafari Posted May 16, 2011 Author Report Share Posted May 16, 2011 Interesting. I wonder what effects he's found from their use? I would think stocking them means there's some useful purpose. Link to comment Share on other sites More sharing options...
FlakMagnet Posted May 17, 2011 Report Share Posted May 17, 2011 I have been using a ferrite ring for about six months.The area's I hunt in are huge emi fields. I am using it on a 14" elip. Advantage coil.If it works, as you might expect, it's results are subtle at best.Flak Link to comment Share on other sites More sharing options...
aksafari Posted May 17, 2011 Author Report Share Posted May 17, 2011 Wow, a first hand account. Thanks, Flak. It's always interesting when I have an idea, and I don't actually have to experiment to check it: other people had the idea first and have already done the research. Like they say 'A day in the library can save you six months in the lab'. I suppose you replace 'in the library' with 'on the internet', these days. Link to comment Share on other sites More sharing options...
FlakMagnet Posted May 17, 2011 Report Share Posted May 17, 2011 I should have added that it is a two piece snap-on ring...Also you should know, I do not plan on taking it off...I like it.Flak Link to comment Share on other sites More sharing options...
montana Posted May 17, 2011 Report Share Posted May 17, 2011 Flak. Put one on your headphone cable if you are using headphones. I've been told that they clean up any white noise that may be present. I've got some ferrite rings coming and will experiment with them.----Bob Link to comment Share on other sites More sharing options...
pkirkll Posted May 17, 2011 Report Share Posted May 17, 2011 Can I put one on my speaker wire Bob???I bought the 2 piece jobs from Dave L in congress..I think I gave one to Rob, I know I gave a couple to Chris } and his dad at bthe Decision Corner/ liars circle /cookoff /get together this year...chris and his dad were gonna check them out and see what they thought....To be honest I haven't used a detector enough to know if they are helping me or not....but the 4000 is sure smooth up here in NV!They were only 5 or 6 bucks so what the hey.....you know. Try em and if you don't like em use them for sinkers when you go surf fishing.From up in the land of everything...northern NV...Paul....or. I was a congressman Link to comment Share on other sites More sharing options...
El Dorado Posted May 17, 2011 Report Share Posted May 17, 2011 I have been using one on my commander 12x15 Mono for awhile. I really can't say if it helps or not, but leaving it on anyway. That coil runs very quiet with it on or off..... Link to comment Share on other sites More sharing options...
montana Posted May 17, 2011 Report Share Posted May 17, 2011 Paul. You surely could put one on your speaker wire. I would fix it so it couldn't slip around, like maybe a few wraps of electrical tape to get the diameter close to the inside diameter of the ferrite ring. One advantage of the ferrite ring on your coil wire may be that it could lessen the EMI transmitted by your detector, thereby allowing 2 similar detectors to work closer together since that is supposed to be the main function of the gadgets.----Bob Link to comment Share on other sites More sharing options...
aksafari Posted May 17, 2011 Author Report Share Posted May 17, 2011 Fascinating anecdotes, everyone. Didn't imagine that there would be such widespread usage already! As they say 'there's nothing new under the sun', so I shouldn't be surprised! Link to comment Share on other sites More sharing options...
notoriouskelly Posted May 18, 2011 Report Share Posted May 18, 2011 We used to put them around phone system cables - don't know if they work; just did what we're told Link to comment Share on other sites More sharing options...
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