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Everything posted by Jim in Idaho
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TDI Ground Balance On Versus Ground Balance Off
Jim in Idaho replied to Steve Herschbach's topic in White's Metal Detectors
John, I couldn't agree more. I'd be happy with a TDI SL that ran from a 21v 5-cell Li-ion battery pack. Maybe with Reg Sniff's filter capacitor modification to ice the cake! Combine that with a Nugget Finder 12" round, spiral wound coil and you'd have a lightweight, really capable PI. Jim -
TDI Ground Balance On Versus Ground Balance Off
Jim in Idaho replied to Steve Herschbach's topic in White's Metal Detectors
The "deeper with GB on" is true with the SL, but apparently not the others. Auminesweeper is right, and my tests also bore it out. Regardless of the GB setting, as long as it's "on" the air tests show a definite improvement. Reg S. and I discussed this at length, and didn't come to any conclusions as to why, though Reg mentioned the GB circuit on the SL is different than the other TDI's. Jim -
The PI detectors use a voltage regulator on the Receiver, but the transmit circuitry is current driven, so a higher battery voltage means a stronger pulse into the ground. My personal theory on why this mostly pertains to the larger coils is that the smaller coils are "maxed out", or saturated, at the regular 12v nominal, so don't benefit much from the higher voltage. Jim
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Mark, he has a hard time with typing anymore, so seldom posts, unless he has something of real value to add to a discussion. Jim
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New White's Electronics Forum Is Up
Jim in Idaho replied to Mark Gillespie's topic in White's Metal Detectors
Yeah, I tried to login...no go. Also tried to register, but it asked me to choose a subscription to buy, with no choices. I sent a note to Vbulletin about it. Maybe they can straighten it out. Jim -
First Gold This Season For Me....
Jim in Idaho replied to oneguy's topic in Detector Prospector Forum
From what I see up here in Idaho & Wyoming, cold weather has no impact on ticks. Many of them even at elevations above 7,000', where it gets way below zero. One of 'em in Wyoming got me a few years ago, and I ended up with Rocky Mountain Spotted Fever. Now I treat all my outdoor clothing with Permethrin, and my skin with Picaridin. Tick diseases are really nasty. Jim -
My pleasure, Mark. It's nice to be able to make a contribution to the forum. I've looked at, and enjoyed your videos, too, and appreciate your efforts to educate us on the TDI SL. Jim
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More on this subject.....I'm just going to attach the files, as I find them Jim TDI SL Tests.doc
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Mark, I think the entire results were posted on the White's forum on Findmall, and I may have posted them on the White's factory forum, too. I'll do some looking around. I did some other testing, too. I may have all that in my PC, too. haven't looked at it for a while. I did some looking and found this in my files, on the 7.5DF: Battery Voltage tests Whites TDI SL 7.5"DF coil Freq: centered: Pulse Delay: 10: Gain: Max !6.2V Nickel 1 grain Gold Bar GB OFF: 10.75" 2.75" GB ON Switch in "all" Min. 12.75" 2.75" Max. 13.25" 3.00" GB On Switch set in "low" N/C N/C 12.3v Nickel 1 grain Gold Bar GB OFF 11.0" 2.75" GB ON Min. 12.75" 2.75" Max. 13.0" 2.75" Jim
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Anybody Know What's Up With White's Forums?
Jim in Idaho replied to Jim in Idaho's topic in White's Metal Detectors
This has nothing to do with Findmall. It's White's Factory forum...not the Whites forum/forums on Findmall. Jim -
I did a whole series of tests, on the TDI SL, and 16.8v battery. at the request of Reg S. He had particular rules about how the tests would be performed. In a nutshell, the results were a definite improvement in both depth, and sensitivity to small items. But the improvement only came with the larger coil. The smaller coils tested included the MJ 5 x 9, and the 7,5"DF. Neither showed much improvement over the 12v battery. Reg and I discussed this, and did not come to a conclusion on the reasons. My thought was that the smaller coils are saturated at 12v, and the extra voltage doesn't allow any more current into the generated magnetic field. On the 12"DF, however the improvement was about 20% as I recall. With the 12"DF, my SL can see a 1 grain nugget at 3" in an air test. It can also see a nickel at 16.5". Best depth was with the target moving vertically toward the coil. That was one of Reg's rules for the testing. I had posted all the test results, but don't remember where. This was about 3 years ago. Jim
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In all the testing I've done, I got the deepest results, regardless of coil used, or battery voltage, with GB on. Just saying. Jim.
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Anybody Know What's Up With White's Forums?
Jim in Idaho replied to Jim in Idaho's topic in White's Metal Detectors
I heard from Steve Howard Monday morning. He said they hoped to have it up this week. Jim -
My testing indicates the 12"DF is very good. Only exceeded by the Nugget Finder 8 x 6 Sadie, and the Sadie, while being more sensitive to really small gold, doesn't match the 12"DF for depth on the bigger items. That said, I haven't tried any of the larger coils by other manufacturers. I liked using the MJ 5 x 9, but it didn't equal the Sadie on the small stuff. The only thing I didn't like about the 12'"DF is it's cumbersome for prospecting in rough terrain. Jim
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The Day We Rolled An Expensive Prospecting Rig
Jim in Idaho replied to klunker's topic in Detector Prospector Forum
Here ya go...The other one is the T38 Talon. I spent the summer of '71 at the training base for the T38 in Arizona. I was a radar tech. -
Anybody Know What's Up With White's Forums?
Jim in Idaho replied to Jim in Idaho's topic in White's Metal Detectors
Thanks for the update! Jim -
Haven't been able to get on there for a couple of days. I'm wondering if they stopped having the forums? Jim
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The changes to the TDI SL were about increasing the sweep speed, without loss of sensitivity to small nuggets. That was accomplished by changing the aforementioned capacitor values. Here's what Reg posted on this mod. "The caps being removed are C20 &21, .47uf and will be replaced with .22uf. Use 50v Panasonic, or Rubicon Stacked Metal Film Polyester type." Credit to Reg Sniff The only other change was increasing the battery voltage to 16.8 volts. There is a small risk of trouble by doing that. The capacitors in the power supply are only rated for 16v. But I don't know anybody that has used the higher voltage that has had problems. I've been using the 16.8v pack for 2 years. It does make a substantial difference in depth and sensitivity. Jim