TC-AZ Posted March 31, 2021 Share Posted March 31, 2021 This maybe a newbie question but, what is the difference in the 12" Dual Field Coils pictured here other than the black and white labels? Is one 1st gen. or 2nd gen. or something else? Thanks, TC-AZ Link to comment Share on other sites More sharing options...
Geotech Posted March 31, 2021 Share Posted March 31, 2021 No difference. Link to comment Share on other sites More sharing options...
Steve Herschbach Posted March 31, 2021 Share Posted March 31, 2021 The black and white decals are newer is all, the gold scheme being used for ages before the change. Link to comment Share on other sites More sharing options...
Hard Prospector Posted April 1, 2021 Share Posted April 1, 2021 Those DF coils really sucked down the battery juice causing the TDI to become un stable (and difficult to ground balance). I would check the batteries every couple hours of run time. The smaller DF coil for sure better than the larger one. Link to comment Share on other sites More sharing options...
GB_Amateur Posted April 1, 2021 Share Posted April 1, 2021 57 minutes ago, Hard Prospector said: The smaller DF coil for sure better than the larger one. Better in what way? Link to comment Share on other sites More sharing options...
Hard Prospector Posted April 1, 2021 Share Posted April 1, 2021 Sensitivity to smaller non ferrous targets objects. The TDI always lacked the power to effectively use the larger loops to any decent depth, especially gold. Link to comment Share on other sites More sharing options...
Cascade Steven Posted April 1, 2021 Share Posted April 1, 2021 Is the battery drain issue and lack of power issue of larger coils also applicable to the TDI Pro and also the TDI SL? Link to comment Share on other sites More sharing options...
Hard Prospector Posted April 1, 2021 Share Posted April 1, 2021 11 hours ago, Cascade Steven said: Is the battery drain issue and lack of power issue of larger coils also applicable to the TDI Pro and also the TDI SL? Mostly the SL as it ran (mostly) on AA's with the usual White's slide in clam shell..........but even the Pro with its larger rechargable battery pack was still no depth demon. You could never trust the low battery light indicator to signal when the voltage dropped below the point where the batteries should be replaced or recharged. Every 2 hours of run time I would check or change them out in the field. If nugget shooting with this detector its been my experience that loops 6 x 10 or SMALLER were most effective, especially the (5 x 9) folded over mono. The larger DF coils were the worst (unless looking for .50 cal musket balls or civil war belt buckles). The TDI series was a good PI that held lots of promise to evolve. Unfortunately chief engineer Dan Geyer, who ran the project and was advancing it, suddenly passed away at the worst possible time. Turns out he was irreplaceable. I believe the loss of this brilliant man began the down hill slide not just for the TDI but for White's in general. Link to comment Share on other sites More sharing options...
Cascade Steven Posted April 1, 2021 Share Posted April 1, 2021 Hard Prospector: Thank you for your insight. I have a TDI SL and am still learning the details of this machine. Link to comment Share on other sites More sharing options...
Hamid Posted April 1, 2021 Share Posted April 1, 2021 TDI is unbeatable machine. There still is nothing that will match them for depth on gold items! They are no other PI units out there today that can equal it's performance. Those loops are rare, you are so lucky to have them. Remember that well, any coil has a name "TDI" works extremely well, just which one that needs to use in right place. I wish you all the best🙂 Hamid Link to comment Share on other sites More sharing options...
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