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SEF coil & bottlecaps

D

dan93

New member
Do the SEF coils affect the ferrous numbers? Do you dig bottlecaps with the SEF coils over the stock coil?

Thanks
 
Your ferrous numbers will be the same as stock. You will dig crown tops. I dig a few iffy numbers to see what they are and if I get crowns, I ignore that number....Bet I am passing up some goodies by cherry-picking and bein lazy:clsoedeyes:
 
I've dug bottle caps with a SEF 6x8, Stock and a 13" Ultimate coil. I don't think I dig anymore with the SEF than the others. I've never noticed a difference in Ferrous numbers on all three until you start dealing with deep iffy signals and trash. One thing that I believe happens with the SEF is bottlecaps sometimes give a very flutie sound. Seems it may be more pronounced with the SEF than the others but I'd really have to do some comparing to be sure. The only problem is I've had deep coins in trashy areas sound very similar.......and I have a problem walking away from them. I have dugs some good deep targets with trash in the hole that sounded just like some bottlecaps I've dug.
 
Rusty bottle caps almost always come up at around 01-22 for me on the 6x8 coil, i dig some of they are deep
 
Thanks for help everyone! I ordered new E-trac, I will try stock coil first then get SEF after
 
one of the reasons I got rid of the SEF and got the coiltec 10x5 ... bottle caps will be off on the FE numbers everytime
 
Most rusty crown caps that have the foil liner in them, sound like a coin. If you're using TTF, then you get two sounds, iron and non ferrous at same time. That will cause me to dig them everytime......nge
 
surfchunker said:
one of the reasons I got rid of the SEF and got the coiltec 10x5 ... bottle caps will be off on the FE numbers everytime
Click to expand...

Surf when you say the FE numbers will be off..... how much?? I've had FE's vary due to many reasons I believe. I usually run as high a sensitivity which can affect FE"s. especially on deeper targets. Simply turning down sensitivity on a good sounding target has changed FE for me.... although sometimes minimally, but they do change. Whole bottle caps as opposed to crushed or folded all respond different. Throw in a nail or some other trash and FE's will be affected too. Do you find with the coiltec, bottle caps will ring up consistent enough to the point your confident enough to walk away from the target that responds with certain FE's.
 
I think its primarily the size of the coil... contributing also is the depth, position in hole, form factor and the corrosive degree of the iron that are the major factors of mis-IDing some of those older ferrous bottle caps as coins.
My large Tornado coil will correctly ID iron at all depths a lot better than my small Sharpshooter coil which likes to ID iron as a coin especially deeper iron.

My theory right or wrong, the deeper and the more corroded the iron, the less capable a smaller coil might have inducing a strong enough transmit magnetic field into the target resulting in weaker target eddy currents tricking the detector to ID more conductive. Add to this, a smaller coil might also be less capable of receiving the target's resulting weaker eddy current magnetic fields adding to flawed and jumpy IDs.

Aluminum bottle caps?
Sometimes if the depth reading is on the surface and the hand pin pointer can't detect it, 9 out of 10 times its junk with a mass larger than a coin like an aluminum bottle cap, foil ball, beaver tail or can slaw. Usually quick screw driver probing will positively ID those with no need to dig a plug.
For the deeper ones, just got to dig em.
 
most of the times a bottle cap on the coiltek will be a FE of 10 one direction and 22 the other direction ... I dig very few of them and know it's probably going to be a bottle caps when I do dig one. don't think I have ever got a good target when I thought it was a cap to start with
 
I had the SEF 8x6 and the NEL 12x8 and the NEL was the worst coil I have ever used. I really wanted to like it too. but it just didn't hit good targets very good,. broken up scratchy tones, hard to pinpoint with, It's like buying a Porsche and putting cheap walmart tires on it .... just seems to me if you have a $1500 MD you shouldn't be afraid to spend a couple hundred for a great coil, I will have to say the ultimate coil is a killer ... 95% of the time I have either the coiltek 10x5 or the Ultimate coil on there. I also have the 15" WOT for when I need extreme depth or max. coverage
 
Surf , just to be sure, don't think I was trying to dispute your results. I am interested in your results with the coiltec compared to the SEF 8x6 that I use. Like I said I need to do some more testing of targets and diggem all for a while to see if I can find a link to BC and CC that will give me a set of factors to say, "OK not digging that one". I really think it's all going to come down to audio response and less of the numbers. Thinking about adj. variability or gain either together or separate, to see if I can make BC and CC sound different. Anybody messed with this? Surf, Thanks for the comments. Hunter
 
mostly coins will be steady even if the numbers are off. but there is exceptions ... Wednesday I had a crazy bad signal in my local park that has been pounded to death for 40 years ... but I could get a squeaky high tone or it would just null out. went to QM and Manual sens at max and it was repeatable high tone but I wasn't expecting anything good, but got my first silver there a 1929 merc at 10" let your brain have the final say
 
To me or any other aging detectorist, it all depends on your current health. If your knees are shot, if your shoulder dis-locates easily, if your back is killing you....... it doesn't matter what your machine and coil brand you're using is trying to tell you, listen your body, then decide whether you're going to dig it or not. Sometimes when I have a lot of time, and the weather is cool enough, I WILL dig everything! Other times if I don't have much time to hunt, I will cherry pick. To each his own............ NGE
 
my knee's are shot too and have 12 screws and a plate in my right tib/fib plateau ... so I'm kinda of picky a lot of the times if it's loaded with junk I will dig only good targets I'm sure about (only 12-40 and up repeatable) ... old sites with few targets I will dig more targets ...
 
Well, in 2012 I had two total knee joint replacements, now I don't have any problems getting on knees w/pads. But I still bend at the waist digging targets. If I am having problems locating said target or it is much deeper than I thought, I will sit or lay next to the plug and loosen dirt with a screwdriver (so as NOT to scratch item) My screwdriver has a brass tip that I brazed onto it, then pull loose dirt out and retrieve target.....NGE
 
yeah I lay down too if it's not a quick recovery ... lol
 
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