Did another F-75 test last night with a nail and a dime. Placed the nail directly on top of the dime. Mode = delta pitch, disc = 0 and disc = 6 in addition. The dime signal comes through loud and clear IF the coil is swung over the short axis of the nail. If you TURN 90 DEGREES and swing the coil over THE LENGTH OF THE NAIL, then all you hear is an iron tone. 90 degrees makes a huge difference. Can't say I can argue with those who recommend the all-metal-dig-it-all-strategy. At least for relic hunting at older sites. - Jim
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Rotate that coil over 'iron' targets!
- Thread starter ziphius
- Start date
The All metal `mode` is good ! You do not have to dig everything.The people that dig everything iether can`t read the F75 or they are just being silly and digging for the sake of digging.
Read the meter figures and see what the readout is telling you . Anything below 18-22 is rubbish.Also high 85-90 figures is Iron.
Above those low 18-20 fiqures is Non ferrous. You can pre check to see if its deep iron by listening and analising the signals make up, and also flicking into pinpoint to listen to the signal in that. If its a long wide signal it`s Iron, if its a short narrow signal , its usually good.
The simple thing is, to know, and learn what your F75 is telling you.
Read the meter figures and see what the readout is telling you . Anything below 18-22 is rubbish.Also high 85-90 figures is Iron.
Above those low 18-20 fiqures is Non ferrous. You can pre check to see if its deep iron by listening and analising the signals make up, and also flicking into pinpoint to listen to the signal in that. If its a long wide signal it`s Iron, if its a short narrow signal , its usually good.
The simple thing is, to know, and learn what your F75 is telling you.
Chris(SoCenWI)
Well-known member
Jim,
I've been explaining that test over on the Explorer forum for years. It's the main reason that in trashy areas you have to hit the site from many different angles.
I tried the same thing with my F-75 and it behaves the same; you can still get the hit when the nail is orientated parallel to the center web of the coil. Once you start rotating away from parallel you will eventually only get an iron hit. I also played with setting the nail a short distance to either side of the coin. The problem I had with the F-75 is that this often affects the target ID, giving a indication of a lower conductivity than what the target actually is. I also found that doing the "minelab" wiggle- very short swings over the target often helped give a better ID, contrary to what is often written about using wide swings.
I spent quite a bit of time trying different scenarios that simulated trashy environments, and found the F-75 and the Explorer were pretty closely matched. The biggest difference was that the explorer's 2 dimensional display gave a much better indication what the target next to the nail actually was. The F-75 let you know something non-ferrous was there, but was not nearly as accurate on ID. If you are in a colonial/battlefield site and digging everything non-ferrous; not a problem.
Another phenomena that I've seen with the explorer is that larger coils have more of an ability to "see" under trash that is often missed by the smaller coils. Wonder if Fisher is going to bring out larger coils?
Chris
I've been explaining that test over on the Explorer forum for years. It's the main reason that in trashy areas you have to hit the site from many different angles.
I tried the same thing with my F-75 and it behaves the same; you can still get the hit when the nail is orientated parallel to the center web of the coil. Once you start rotating away from parallel you will eventually only get an iron hit. I also played with setting the nail a short distance to either side of the coin. The problem I had with the F-75 is that this often affects the target ID, giving a indication of a lower conductivity than what the target actually is. I also found that doing the "minelab" wiggle- very short swings over the target often helped give a better ID, contrary to what is often written about using wide swings.
I spent quite a bit of time trying different scenarios that simulated trashy environments, and found the F-75 and the Explorer were pretty closely matched. The biggest difference was that the explorer's 2 dimensional display gave a much better indication what the target next to the nail actually was. The F-75 let you know something non-ferrous was there, but was not nearly as accurate on ID. If you are in a colonial/battlefield site and digging everything non-ferrous; not a problem.
Another phenomena that I've seen with the explorer is that larger coils have more of an ability to "see" under trash that is often missed by the smaller coils. Wonder if Fisher is going to bring out larger coils?
Chris
iliketodigit
New member
Chris, have a look here for a review of the Detech 15x12 SEF coil for the F75.
http://www.xs4all.nl/~pa4tu/metal-detecting/documents/test_detech.pdf
You may have to copy and paste the above url into your browser.
Take care, Mart.
http://www.xs4all.nl/~pa4tu/metal-detecting/documents/test_detech.pdf
You may have to copy and paste the above url into your browser.
Take care, Mart.
iliketodigit
New member
The major problem with the 18 to 22 range in the UK is that cut hammered coins and even some full thin ha mmered coins can come within that range.
With these that's were the tone can be a help, but in that range i dig every all signals to start with untill, i have the coke sound in my head, below 16 i don't.
Take care. Mart.
With these that's were the tone can be a help, but in that range i dig every all signals to start with untill, i have the coke sound in my head, below 16 i don't.
Take care. Mart.
Out in the field I probably get funny looks from other detectorists as I have that tendency to "circle the wagons" around a target I've located. I'll listen to it from all angles before I dig it. And I've found quite a few non-ferrous items that initially register as ferrous items. Not because of there being a nail in the hole but because of our dirt reading high on the Fe meter (.3 to 1).
RelicDigger1
New member
I'll have to agree with Dig-it. Like the hammered silvers, percussion caps fall in this range. While not quite as historically important, perhaps, or rare as an Edward I or Elizabeth I hammered, but small hat letters and numbers on battlefields and campsites here in the States fall right in that recommended "shun" range -- 18-23. I've heard that over and over. Don't dig the 23 and below.
I've dug everything 16 and above, which has resulted in several hat letters and tinback cuff buttons.
Richard
I've dug everything 16 and above, which has resulted in several hat letters and tinback cuff buttons.
Richard