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Nexus 30" and 21" Concentric Coils For Minelab GPX
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<blockquote data-quote="Candigger" data-source="post: 514002" data-attributes="member: 14328"><p>To answer accurately this question will have to go trough some digits.</p><p>I will use as an example some of my air test measurements.</p><p>All settings are FP, Mono, Fixed, Normal, Deep. </p><p>Coil 21"CC</p><p>Max. Depth/Mono - 330ml can at 145 cm</p><p>Hot Ground/ CC - 330 ml can at 140 cm, - 3.45%</p><p></p><p>Max. Depth/Mono - 600 gr. nugget at 135 cm</p><p>Hot Ground/ CC - 600 gr. nugget at 125 cm, -7.4%</p><p></p><p>Max. Depth/Mono - 5 grams gold ring at 75 cm</p><p>Hot Ground/ CC - 5 grams gold bar at 62 cm, -17.3%</p><p></p><p>Max. Depth/Mono - 5 grams gold bar at 60 cm</p><p>Hot Ground/ CC - 5 grams gold bar at 50 cm , - 20%</p><p></p><p>Max. Depth/ Mono - 0.5 grams Australian gold nugget at 19 cm</p><p>Hot Ground/ CC - 0.5 grams Australian gold nugget at 20 cm , + 5.2% </p><p></p><p>I have more detailed test table, which describes the tendency of loosing depth consistently when the coils are used as Concentric. In Mono mode they are deeper always, short of the 0.5 grams gold nugget case where the RX loop adds some small extra depth.</p><p></p><p>So to answer your question you will have to choose what type of target is the most likely for you to be interested in and then take into account the mentioned above results, which vary from 20% loss of depth to 5.2% gain of depth.</p><p></p><p>As a rule of thumb 10% smaller in diameter coil will exhibit 20% loos of depth. So in the worse result scenario this 21"CC in Hot Ground mode will be equivalent to a 19" Mono. If we take into account that the GPX depth changes are not linear with coil size increments then the 21"CC in Hot Gropund mode will be more equal to 19.5-20" Mono.</p></blockquote><p></p>
[QUOTE="Candigger, post: 514002, member: 14328"] To answer accurately this question will have to go trough some digits. I will use as an example some of my air test measurements. All settings are FP, Mono, Fixed, Normal, Deep. Coil 21"CC Max. Depth/Mono - 330ml can at 145 cm Hot Ground/ CC - 330 ml can at 140 cm, - 3.45% Max. Depth/Mono - 600 gr. nugget at 135 cm Hot Ground/ CC - 600 gr. nugget at 125 cm, -7.4% Max. Depth/Mono - 5 grams gold ring at 75 cm Hot Ground/ CC - 5 grams gold bar at 62 cm, -17.3% Max. Depth/Mono - 5 grams gold bar at 60 cm Hot Ground/ CC - 5 grams gold bar at 50 cm , - 20% Max. Depth/ Mono - 0.5 grams Australian gold nugget at 19 cm Hot Ground/ CC - 0.5 grams Australian gold nugget at 20 cm , + 5.2% I have more detailed test table, which describes the tendency of loosing depth consistently when the coils are used as Concentric. In Mono mode they are deeper always, short of the 0.5 grams gold nugget case where the RX loop adds some small extra depth. So to answer your question you will have to choose what type of target is the most likely for you to be interested in and then take into account the mentioned above results, which vary from 20% loss of depth to 5.2% gain of depth. As a rule of thumb 10% smaller in diameter coil will exhibit 20% loos of depth. So in the worse result scenario this 21"CC in Hot Ground mode will be equivalent to a 19" Mono. If we take into account that the GPX depth changes are not linear with coil size increments then the 21"CC in Hot Gropund mode will be more equal to 19.5-20" Mono. [/QUOTE]
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Nexus 30" and 21" Concentric Coils For Minelab GPX
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