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Small Coil , Which one is the best?
- Thread starter GroundScanner
- Start date
GroundScanner
Active member
Thank you all for the input, i myself am leaning toward the 6x8 sef.
No, 8X6 SEF DD butterfly style coil. Black in color and hits the same vdi as my other coils. Love mine. Super light weight and better
Separation & Depth then my 6x10 DD & 5.3. My D2 is still the Boss for coverage and depth but at my age I cover more ground in
Trashier area's. Can't get it to overload... Even at 15 w/tx boost on.
IMHO this is what works for me.
8x6" SEF (Butterfly)
Search Coil for White's
(All Spectras/DFX/MXT/M6)
Coil Cover Included
Cat# 134-8x6w
Separation & Depth then my 6x10 DD & 5.3. My D2 is still the Boss for coverage and depth but at my age I cover more ground in
Trashier area's. Can't get it to overload... Even at 15 w/tx boost on.
IMHO this is what works for me.
8x6" SEF (Butterfly)
Search Coil for White's
(All Spectras/DFX/MXT/M6)
Coil Cover Included
Cat# 134-8x6w
Is there any reason we can't spray paint the 8x6 SEF white? I frankly find it odd that coil manufacurers keep making most coils in black, and then warn against over heating a coil once failure complaints come in... saying "You are asking for trouble leaving a coil inside a car trunk, due to adhesives around the coils reflowing inside." What do they do? Keep making them black! martin
Temperatures encountered while hunting aren't going to permanently damage coils. Colors are only going to be affected by radiation heat (sunlight absorption or reflection). A coil in a trunk will get just as hot whether it is black or white. White coils will be less affected by hot sunlight so they may be less affected by temporary shifts (accuracy).
It's funny, people were asking if they could paint the 6x10 black because they didn't like the way the white coil looked. I was selling another brand coil and had a hard time selling it because it was white. they wanted the newer black one.
If the paint has no metal in it, it will not harm the coil performance.
Most of the very early ( years ago) coil problems were caused by curing problems IMHO.
It's funny, people were asking if they could paint the 6x10 black because they didn't like the way the white coil looked. I was selling another brand coil and had a hard time selling it because it was white. they wanted the newer black one.
If the paint has no metal in it, it will not harm the coil performance.Most of the very early ( years ago) coil problems were caused by curing problems IMHO.
"Most of the very early ( years ago) coil problems were caused by curing problems IMHO."
I was being sorta smarty over the black color, but I vaguely remember a post you replied to once Rob about the black 8x6 SEF coils not being as heat resistent as the white SEF coils. My take then from your comment was that color and heat saturation counted between white and black. The subject then(I have to research that post to find it) wasn't specifically about the colors, but kinda about non-Whites coils and after market coils.
About the curing problems you mentioned from years ago. I started the Whites trek in 2010, and me being a retired electronics guy who did his share of reliability tests over 20 years, before presenting the product to the US government, reliability tests were done. Doesn't it make sense today that I shouldn't have to worry each time I take ALL of my coils in the car with me on a hunt because I might get resin reflows and weakened coils? Seriously Guy, just interior cabin heat in a car? Fox himself said that "it's asking for a disaster to happen" by leaving coils in the trunk of a car for the interior heat.
Painting a coil white was just a sarcastic point to be made over the issue of killing coils in car trunks, yet the post I am trying to remember that you responded to about the differentiation between the white colored SEF, and the black 8x6 SEF, still comes to mind. If you really think about it though, a less than hard core detectorist like I was when I started, would easily put a coil under 100 degree Texas heat for hours any given day and pack all his coils in the trunk, even on casual rides.
You are telling me that I can't perma
I was being sorta smarty over the black color, but I vaguely remember a post you replied to once Rob about the black 8x6 SEF coils not being as heat resistent as the white SEF coils. My take then from your comment was that color and heat saturation counted between white and black. The subject then(I have to research that post to find it) wasn't specifically about the colors, but kinda about non-Whites coils and after market coils.
About the curing problems you mentioned from years ago. I started the Whites trek in 2010, and me being a retired electronics guy who did his share of reliability tests over 20 years, before presenting the product to the US government, reliability tests were done. Doesn't it make sense today that I shouldn't have to worry each time I take ALL of my coils in the car with me on a hunt because I might get resin reflows and weakened coils? Seriously Guy, just interior cabin heat in a car? Fox himself said that "it's asking for a disaster to happen" by leaving coils in the trunk of a car for the interior heat.
Painting a coil white was just a sarcastic point to be made over the issue of killing coils in car trunks, yet the post I am trying to remember that you responded to about the differentiation between the white colored SEF, and the black 8x6 SEF, still comes to mind. If you really think about it though, a less than hard core detectorist like I was when I started, would easily put a coil under 100 degree Texas heat for hours any given day and pack all his coils in the trunk, even on casual rides.
You are telling me that I can't perma
You need to read more closely. In discussing colors I said color made no difference when a coil is in a trunk because there is no sunlight and therefore no absorption or reflection to factor.
Never did I say you couldn't permanently damage a coil in an enclosed hot car. I said you shouldn't permanently damage a coil under hunting conditions outside. When hot they can change accuracy but should go back to normal when they cool. If my computor speaker pad overheats, the speakers quit. When it cools they work again, same idea.
Just did a search,
The atmosphere and the windows of a car are relatively transparent to the suns shortwave radiation and are warmed little. This shortwave energy, however, does heat objects it strikes. For example, a dark dashboard or seat can easily reach temperatures in the range of 180 to more than 200 degrees F.
In the discussion of the 6x8 color was not a factor. The WHITE 10x12 was optimized for the Spectras, the 6x8 which happen to be black was not optimized. Optimization not color was beginning discussed. Would a black colored coil absorb more radiated heat than a white coil which would reflect some, YES. That was DeTech's explanation for making the 10x12 white to help with temporary null shift.
Never did I say you couldn't permanently damage a coil in an enclosed hot car. I said you shouldn't permanently damage a coil under hunting conditions outside. When hot they can change accuracy but should go back to normal when they cool. If my computor speaker pad overheats, the speakers quit. When it cools they work again, same idea.
Just did a search,
The atmosphere and the windows of a car are relatively transparent to the suns shortwave radiation and are warmed little. This shortwave energy, however, does heat objects it strikes. For example, a dark dashboard or seat can easily reach temperatures in the range of 180 to more than 200 degrees F.
In the discussion of the 6x8 color was not a factor. The WHITE 10x12 was optimized for the Spectras, the 6x8 which happen to be black was not optimized. Optimization not color was beginning discussed. Would a black colored coil absorb more radiated heat than a white coil which would reflect some, YES. That was DeTech's explanation for making the 10x12 white to help with temporary null shift.
Just to throw another spanner in the works....Earlier this year in the UK we had some snow & just after the snow was followed by freezing temp's...I took a chance & detected in some woodland with my V3i & the "white" 10 x 12 SEF , the coil got partially covered in iced snow....The coil started to overload at RX 12, went home & cleaned the coil....Stored the coil indoors & checked it 3 day's later RX 15 no over load !!... Coils been good ever since, looks like these coils don't like the cold either...
Ytcoinshooter
Well-known member
Intersting thread. I routinely cover any detector or coil riding in my trunk or back seat with a towel or other barrier to reduce heat absorbed and / or keep direct sunlight off it. In the trunk I place the control box (if a detector) or coil under the furthest part of the trunk that meets the back seat. Back seat items that might stay in the car go on the floor, covered. The detector I plan to use is riding on the back seat....maybe I'll buckle it up next time LOL 
!
Im kind of a freak at taking care of my stuff because I dont want a self induced problem.
Looking forward to getting out again with my V3i. I also am anxious to try out the 950 coil to compare it to the 2D.
HH-Bruce
! Im kind of a freak at taking care of my stuff because I dont want a self induced problem.
Looking forward to getting out again with my V3i. I also am anxious to try out the 950 coil to compare it to the 2D.
HH-Bruce
The temperature problem is of interest to me out here in west Texas and it is not in transporting the detector. It is 2:15 pm CT and the air temperature is 96.5 F in the shade. I just took my hand held temperature gun and took a reading of the ground surface out where we would be out swinging the coil---it is already at 150.3 F. We have not even hit our high for the day which is expected to be over 102F.
TX boost and the small coils are a match made in heaven living here in the Pacific Northwest. Just getting in tight to rough ground amongst the brambles is huge not to mention the rough hillsides. People here built along the railroad tracks too. You can think all you want to about roads,gathering spots and public areas from back in the day but "paths" are not as obvious and between blackberry bushes and all the undergrowth.....there are hillside towns that had populations in the thousands and not much left to suggest it.
1. 4x6 works great to work old chain link fences like no other.....rings. Sidewalks that have re-enforcing rebar close to the edge...add TX and your down to the original "grade" where coins roll off the sidewalk and "stay", sitting on the harder subgrade. (For some reason I've found more SLQs' here than any other one spot?) Detuned settings will also allow this one to get under the bottom rail of old bike racks.
2. The 5.3 is a goto coil under the heavy EMI lines and leaky transformers when doing parking strips. TX boost here rules and make sure you have either extra batteries or rechargeable as it's a juice eater!
In a world thats not all "fields", the small coils get you in there tight and get you added finds when you bring them into an intelligent approach. (Taking advantage of the "lazy" in us all is a "last frontier" too.)
1. 4x6 works great to work old chain link fences like no other.....rings. Sidewalks that have re-enforcing rebar close to the edge...add TX and your down to the original "grade" where coins roll off the sidewalk and "stay", sitting on the harder subgrade. (For some reason I've found more SLQs' here than any other one spot?) Detuned settings will also allow this one to get under the bottom rail of old bike racks.
2. The 5.3 is a goto coil under the heavy EMI lines and leaky transformers when doing parking strips. TX boost here rules and make sure you have either extra batteries or rechargeable as it's a juice eater!
In a world thats not all "fields", the small coils get you in there tight and get you added finds when you bring them into an intelligent approach. (Taking advantage of the "lazy" in us all is a "last frontier" too.)