Steve Herschbach Posted October 8, 2019 Share Posted October 8, 2019 All-new patented 8"×12″ Dual Field coil for improved depth and sensitivity. Bonus 7.5″ Dual Field concentric coil for a limited time! To hunt all day, you need a lightweight detector that still provides high performance. The TDI SL Metal Detector has pulse induction power that provides unbeatable depth and sensitivity and is designed specifically for prospecting and identifying relics. Special prospecting features make life easier, such full-control ground balance that filters out the iron mineralization of hot rocks, black sand, and other tough grounds. This compact detector weighs only 3.5 pounds with its waterproof 7.5" x 12” High-Q Search Coil, which offers deep detection depth. Other accessory coils are also available. The rechargeable NIMH battery lasts up to 6 hours, and a backup AA battery back will power all-day exploration. Owner's Manual (for TDI SL series, none specific to High-Q) White's TDI SL High-Q Camo metal detector White's TDI SL High Q Technical Specifications* Internet Price TDI SL High Q $1099 (available in both tan or camo colors) Technology Ground Balancing Pulse Induction (GBPI) Frequency 3250 - 3370 Pulses Per Second Autotune Mode(s) Slow Motion Ground Rejection Manual, one turn control Soil Adjust Ground Balance On or Off (two position switch) Discrimination Conductivity switch*, 10 - 25 Pulse Delay Volume Control No Threshold Control One turn control Tone Adjust No Audio Boost No Frequency Offset One turn control Pinpoint Mode No Audio Output Speaker, 1/4" headphone socket Hip Mount No Standard Coil(s) 7.5" x 12" High Q plus bonus 7.5" round Dual Field (Limited Time only) Optional Search Coils Over 100 accessory coils available by White's and others Battery Rechargeable NiMH & AA Operating Time Up to 6 hours Weight 3.5 pounds Additional Technology The TDI was designed specifically to be able to use Minelab SD/GP compatible coils. However, performance can vary and the pulse delay may have to be advanced to compensate for coil differences that result in overload readings. Notes *The TDI is unique in that it can suppress audio responses into two different classes. Targets have a high tone or low tone audio depending on how the target relates to the ground balance setting. In general high conductive targets give a low tone and low conductive targets a high tone. The TDI can be set to allow for one response or the other. See White's TDI Coin Settings for more details on this control. *Notes on Technical Specifications - Detailed notes about the specifications listed in this chart. White's TDI SL High-Q Tan metal detector White's 7.5" x 12" High-Q coil for TDI series White's 7.5" round Dual Field coil for TDI series 3 Link to comment Share on other sites More sharing options...
Jim in Idaho Posted October 8, 2019 Share Posted October 8, 2019 What is the "Auto-tune" Mode, Steve? Never heard of that. Jim Link to comment Share on other sites More sharing options...
Steve Herschbach Posted October 8, 2019 Author Share Posted October 8, 2019 All threshold based motion type detectors have a threshold autotune or reset rate, either preset or adjustable. I added a link to the tech notes. Plus here is a detailed article... https://www.detectorprospector.com/magazine/steves-guides/steves-guide-metal-detector-autotune-threshold-sat-vsat/ 1 Link to comment Share on other sites More sharing options...
Jim in Idaho Posted October 9, 2019 Share Posted October 9, 2019 I had no idea that the TDI had that. The threshold on mine rises as the battery voltage declines, so I have to keep turning it down. But, it's relatively flat other than that. Just never thought about it. Also, the ad I swa for the new Whites TDI showed, and said, it had an 8 x14 DF. Apparently that ad was wrong. Jim 1 Link to comment Share on other sites More sharing options...
Steve Herschbach Posted October 9, 2019 Author Share Posted October 9, 2019 The tan page on whites website says 12” and the camo page says 14” and all the dealer ads out say 12”. The Miner John was 12” so I am going with that until proven otherwise. 1 Link to comment Share on other sites More sharing options...
Ridge Runner Posted October 9, 2019 Share Posted October 9, 2019 The only thing that would have made the video better if the TDI SL had been tan with that new coil . Chuck Link to comment Share on other sites More sharing options...
Jim in Idaho Posted October 9, 2019 Share Posted October 9, 2019 Note they said the Auto-Tune was "slow motion". That means if you swing it too fast, the A-T can't keep up. I think that may be what Reg Sniff's sweep speed mod was designed to cure. I also noticed in the video how slow they were swinging. I can see that in a patch, but you wouldn't cover much ground in general searching. Jim 1 Link to comment Share on other sites More sharing options...
garikfox Posted October 9, 2019 Share Posted October 9, 2019 I like this machine, i want one. ? Now the question is, can we use 8 x Energizer Ultimate Lithium's to gain the voltage needed for depth. 8 x 1.81v = 14.48v Link to comment Share on other sites More sharing options...
Steve Herschbach Posted October 9, 2019 Author Share Posted October 9, 2019 If the voltage did not drop almost instantly to 1.5 volts that might work. Reality is probably “no”. From https://data.energizer.com/pdfs/lithiuml91l92_appman.pdf: From ”Although the higher OCV of the LiFeS2 system is 1.8 volts, the nominal or rated voltage is 1.5 volts which makes it a suitable replacement for alkaline and nickel systems. The battery voltage will drop when it is placed under load. For this reason, the higher OCV will typically not damage electronic components, but device designers should take into consideration that the OCV of fresh batteries can range from 1.79 to 1.83V. LiFeS2 batteries fully meet the ANSI specification for a 1.5V battery. When a drain has been applied to the battery, the OCV drops dramatically and then slowly recovers with time.” 3 Link to comment Share on other sites More sharing options...
Mark Gillespie Posted October 9, 2019 Share Posted October 9, 2019 2 hours ago, Jim in Idaho said: Note they said the Auto-Tune was "slow motion". That means if you swing it too fast, the A-T can't keep up. I think that may be what Reg Sniff's sweep speed mod was designed to cure. I also noticed in the video how slow they were swinging. I can see that in a patch, but you wouldn't cover much ground in general searching. Jim You have a very valid point. 1 Link to comment Share on other sites More sharing options...
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