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Winding coils for depth

A

Anonymous

Guest
Hello all,
My tests using my Minelab PI using a 11"DD,14"DD and 18"DD over 3 targets of various mass and surface area showed that for every 1" extra in diameter of the coil above the 11" gave a average loss of depth of 5 percent.
Can you rewind a coil to regain this loss of depth as the diameters increase?
Thanks in advance,
Gazza.
 
What are those three targets: composition and size?
bbsailor
 
bbsailer,
Targets were :
1.25" diameter(2.5oz gold nugget)
3.5 x 3" x 2" (30oz copper nugget)
7" x 6" x 1" (40oz copper nugget}
The test over the gold nugget was the one which disappointed me the most with the larger 14" and 18" as each could not detect further their diameters as the 11" was able too.
Gazza.
 
Was the test done in air or a redug hole? As on a nugget of 2.5oz I have found that all tests done on other than undisturbed nuggets are way out and don't give accurate readings. Also as for the "loss" as you put it I would say that would be the case for most detectors. Also bear in mind that the 11" coil would be the most sensitive due to size than the others and although your tests show what you have said, in reality you should find the 2.5oz nugget at more than twice the depth of the 11" with the 18". I know that when we first used our regulator system, tests showed us with our SD2000 when using a 24"UFO coil we gained, from standard battery to our maximum regulated voltage, 5-8" in depth. With my GPM Mod alone Jack Lange reported that the SD2000GPM with an 11" DD gained 4" over his best 2200 to equal if not better the GP Extreme. This was without the regulation system. So in conclusion battery power and detector have a lot to do with gain from one coil to another. Believe it or not but a SD2000 attached to a CRO on the 11" DD coil can see a AU50c at around 4 feet! but you cannot hear it. People often asked me why I don't make a CRO like add on for the detectors and that is simple who wants to dig a 6 foot hole for mineralised dirt or a hotrock?
 
Ismael,
Thankyou for your detailed reply.
Agreed, digging deep holes in hard ground I'll leave well alone and just admire those dug with blisted hands as evidence from our pioneering prospectors of old.
 
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