Frank in NH
Active member
Using the 8000 today noticed it loves rusty bottle caps using 11' coil, they came in as quarters with high tone. Has anyone noticed this? Have not tried the 10" stock coil on the rusty caps yet, does it do any better?
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Omega and rusty bottle caps?
- Thread starter Frank in NH
- Start date
Frank, the Omega with the 11 inch dd does like rusty bottle caps. I have got into an area that people must have had a beer party. First thing I noticed was the numbers. Seemed that rusty caps would be at 86-87 and less than three inches in pinpoint. With any other coins at the three inch depth, a zinc is 78, a copper memorial is 82 and a clad dime is 84. The Omega locks hard on shallow coins with the numbers and if the numbers differ from these numbers, it is 9 times out of ten a rusty bottle cap. It is hard not to dig a high tone or number in the 80's, but I have found shallow 86 or 87 numbers are bottle caps. It is not much to go on, but after digging a hundred 87 numbers, I have found all but a couple to be caps. Good luck and I hope this helps. R.L.
Here's a few tips and tricks I saved off from another discussion concerning those pesky steel bottle caps (ultimately I think the best solution is to use the 10" elliptical or 8" round concentric coils):
Txquest posted this tip for steel bottle caps:
When I get a dime-quarter signal, I will re-sweep using only the tip of my coil, if the target still registers dime-quarter, I dig, if the VDI falls into the 60's, it is probably one of those pesky caps. This is still a study in progress as I am a new owner with the Omega. Hope this helps.
Jackpine Savage followed up with this:
While not fool proof your method of ID'ing bottlecaps works for me as well. To take it a bit further, on shallower relatively loud hits, sweeping the tip of the coil an inch or so off the bottlecap should give an iron reading while coins will still read as non-ferrous albeit a much lower reading.
Those deeper softer hitting bottlecaps are still dug
but using this method saves a lot of time on the vast majority I run into.
Then Dave Johnson (designer of the Omega) chimed in with this:
Steel bottlecap trick that actually works
Posted by: Dave J. [ Send a Message ]
Date: August 07, 2010 05:42PM
Registered: 3 years ago
Posts: 85
Most of our recent mid and upper range Teknetics and Fisher metal detectors use a signal processing algorithm which is very good in many ways, but does "like bottlecaps" a little more than some other ID algorithms. Not that the steel bottlecap problem is unique to our machines, most modern VLF machines exhibit it to some degree esp. when using a DD searchcoil.
My personal steel bottlecap trick is to turn the searchcoil into the vertical plane and sweep all the way across the target. A coin will usually give a double hit and will usually ID both hits in the range which is normal for that type of target. In other words it will usually more or less agree with the ID you got will sweeping over the target in the normal manner.
Trash of irregular shape will tend to depart more from the ID you got in the normal sweep. Steel bottlecaps will usually ID down into the iron range when you do this.
This technique works better with smaller searchcoils than with larger ones.
I haven't tried it on machines of other manufacturers but I would guess it will work with most of them also.
--Dave J.
FTP-Fisher
One thing that's interesting is that on the T2 there's a bottle cap program that works very well with the 11" DD. On the F75 there's also a bottle cap program, unfortunately it doesn't work well at all with the 11" DD. It would be great to see the program they implemented on the T2 carried over to the other FT products.
HH,
Brian
Txquest posted this tip for steel bottle caps:
When I get a dime-quarter signal, I will re-sweep using only the tip of my coil, if the target still registers dime-quarter, I dig, if the VDI falls into the 60's, it is probably one of those pesky caps. This is still a study in progress as I am a new owner with the Omega. Hope this helps.
Jackpine Savage followed up with this:
While not fool proof your method of ID'ing bottlecaps works for me as well. To take it a bit further, on shallower relatively loud hits, sweeping the tip of the coil an inch or so off the bottlecap should give an iron reading while coins will still read as non-ferrous albeit a much lower reading.
Those deeper softer hitting bottlecaps are still dug
but using this method saves a lot of time on the vast majority I run into.Then Dave Johnson (designer of the Omega) chimed in with this:
Steel bottlecap trick that actually works
Posted by: Dave J. [ Send a Message ]
Date: August 07, 2010 05:42PM
Registered: 3 years ago
Posts: 85
Most of our recent mid and upper range Teknetics and Fisher metal detectors use a signal processing algorithm which is very good in many ways, but does "like bottlecaps" a little more than some other ID algorithms. Not that the steel bottlecap problem is unique to our machines, most modern VLF machines exhibit it to some degree esp. when using a DD searchcoil.
My personal steel bottlecap trick is to turn the searchcoil into the vertical plane and sweep all the way across the target. A coin will usually give a double hit and will usually ID both hits in the range which is normal for that type of target. In other words it will usually more or less agree with the ID you got will sweeping over the target in the normal manner.
Trash of irregular shape will tend to depart more from the ID you got in the normal sweep. Steel bottlecaps will usually ID down into the iron range when you do this.
This technique works better with smaller searchcoils than with larger ones.
I haven't tried it on machines of other manufacturers but I would guess it will work with most of them also.
--Dave J.
FTP-Fisher
One thing that's interesting is that on the T2 there's a bottle cap program that works very well with the 11" DD. On the F75 there's also a bottle cap program, unfortunately it doesn't work well at all with the 11" DD. It would be great to see the program they implemented on the T2 carried over to the other FT products.
HH,
Brian