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Brothers, but oh so different. Tdi Sl and Tdi Pro Oz. (2 replies)

January 19, 2017, 8:59 am
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I didn't really want it, certainly don't need it.. but I bought it and paid too much. But that's what friends are for. The seller and I have gone on many detecting trips, he is now looking at his second hip replacement.. The Tdi Pro Oz series had to go. Last few outings he used my Tdi Sl and I swung his Pro. The Pro is not heavy by any means and balances nicely with most coils, but we all get old. He struggled with the Pro but had no problems with the lighter SL. For people with health issues or if for whatever reason machine weight is critical, the SL shines.

For a while I thought the only difference with the Pro and Sl, aside from size weight and power supply, were the volume control and fine ground balance, wow was I wrong..

From the same White's stable yes but very different. Ground balance settings affect the target response a little differently, the smooth threshold of the SL is not the same as the Pro's unsteady garble... I could steady the Pro threshold by dropping gain but eventually abandoned the threshold and upped the gain a little running silent. Just turned threshold down just past whisper to silent, barely a fraction of a turn, this with gain higher than with threshold. Result were better depth and target response. No fluctuations to distract me just silence.

Goes against everything I believe about nugget hunting, a nice whisper of threshold to hear those tiny fluctuations. That is how I hunt with the Tdi Sl but it just doesn't work for ME with the Tdi Pro. Just past threshold to silent, lots of gain and the PRO performs. Requires careful checking on a regular basis but that just silent position is near 12 o clock, it hasn't varied it's constant and I'm gaining confidence in this technique.

Very different machines, I have to run them their own way. After the SL I cannot stand the Pro's unsteady threshold.

Any suggestions or alternatives in regards to the Tdi Pro threshold. It is new to me so I'm certainly happy to learn and listen..

All the best,
Karelian
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Headphones opinion for TDI pro (3 replies)

January 28, 2017, 6:32 pm
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I need to get a good set of headphones for my tdi pro after finding out that my rat phones volume is way to low for some reason. I'm thinking of the sun ray pro golds anyone use these or have any opinions on what I should get? Thanks

John
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Sl mods (1 reply)

January 28, 2017, 2:20 pm
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Boykin over on the Whites main site says there are a number of mods that will make the SL equal to the PRO as far as depth--anyone know about these mods?
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All roads let to Anderson. Maybe not..? (3 replies)

February 6, 2017, 2:46 am
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Luxury item or a vital peace of equipment? First I looked at the s rod and didn't see any real issue. Experimented with the center extension rod combined with a tall man rod.. ok nice.
Weight and length of the Anderson rod were probably the deciding factors. Weight because the lighter the better.
Length because the lower shafts length can be an issue depending on the coil being used and I like that lower cam, easy swaps between White's and Minelab lowers..

If weight isn't an issue and you just want a straight shaft, just don't like the s rod? Try the White's center extension rod combined with the tall man rod. Fast easy fix for not many dollars.

The images show the Anderson Carbon Fiber rod, original s rod and the center extension rod combined with a tall man lower rod. Spoiled for choice.

All the best,
Karelian
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New to the TDI (1 reply)

February 7, 2017, 5:11 pm
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Just got a big box TDI and have been putting a little time in with it. In trying to understand the sounds, sometimes I get a signal one way but not the other . I can turn 90 deg. and the signal goes away. Are these good targets or mostly junk? Thanks for your help! HH
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TDI SL Coils (1 reply)

February 12, 2017, 9:53 am
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My TDI SL has the stock 12" coil. Are there any larger coils available for it?
If so, where can I find one.
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Exciting discovery (no replies)

February 14, 2017, 8:45 am
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I started inquiring about some old locations I hunt. Most of the locations are old, shut down schools where coal was used as a heating source for decades.
Before the EPA was birthed most people did what ever pleased them when it came to disposing of waste, regardless of what it was and these old school sites are no exception. The burnt coal waste was spread over many acres of school property which created some extremely harsh ground conditions. Grass and weeds find it hard to get a start and most areas are void of any vegetation. Most of the school grounds look like Martian landscapes with small BB size or smaller pieces of coal waste everywhere. This material attracts to a magnet with little effort and can reduce depth of all VLF detectors by well over half. In fact until recently maximum detection depth was actually 2-3”, any target deeper would give a solid iron audio report if any sound at all. After many years of hunting these areas all but completely unsuccessfully I finally purchase a White’s TDI SL.

It turned out the SL opened up these old sites and many nice coins and relics were unearthed, but not without many trials and numerous adjustments.
Case in point: one particular area had been, in my opinion hunted out with many different VLF machines over a 10 year period and I was certain there were no good targets left. I had been hunting about 15 minutes and all the SL was giving were very short audio reports, which sounded more like chatter or EMI and not targets. This prompted me to increase the time delay to about 15 “which increases the time before a transmitted signal is analyzed” thinking the small pieces of coal waste were the short reports I was hearing. Continued hunting another 5 minutes and noticed the short audio chatter continued but not to the same magnitude. Stopping and increased the delay to around 17 and off I went hunting again. Suddenly I noticed the machine was running very quiet, to quiet.
A minute or two later and a very loud low tone, which on the SL means a high conductor, I stopped and reduced the delay to 10 and found my definite answer. The coal waste was causing all the ground chatter and false audio reports. Increased the delay to 17 and recovered a wheat penny around 4” deep. Now to be honest I had to stop for a moment and think about what just happened. Decided to start over I returned to where I began hunting and discovered I had passed right over many good targets. After digging a few more wheat’s I decided to start checking these targets before digging and discovered if I decreased the delay most of these targets became the short sounding audio reports I had heard earlier. The PI was just the trick to discovering some nice coins deeper than 4” in these barren areas.
I must add the SL is not the best choice to make if there is an over abundance of nails because of the very limited discrimination capabilities of this particular machine. As a final note I must admit this machine has opened up a lot of hunted out harsh ground sites.
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TDI GOLD (no replies)

February 19, 2017, 3:07 pm
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Revisited the bad lands today. This time settings were a little different. Still a lot of nails in this area, but this time I opted to hear only low conductors and it paid off. One 10k GF and a nice 10k class ring.
And of course the double handfuls of beer tabs, beaver tails and pencil erasers.
All in all a pretty good hunt.
Todays settings were:
gain 6
GB 6
delay 18
low conductors
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Tdi Pro emergency battery power. 4 x 18650 for $4. (2 replies)

February 27, 2017, 12:51 am
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Just combined a 4 x 18650 battery holder with leads, with a female dc plug 2.1mm. Total cost $4. Some trimming of the holder and some soldering and it's too easy.
Voltage starts at 16.6 v and runs the machine for about half the time of the White's pack.
Half the weight of the factory pack, so works well in combination with my Anderson shaft to shave off a few more grams..
Not for regular use but a cheap and easy replacement or emergency power option if needed.
I charge the batteries using a dedicated smart charger after removing from the battery holder, do not use the factory charger...
Took it out prospecting and it worked well.

Even some of the local wildlife showed a bit of interest..

When they start to get a bit older I'll unpack my factory battery packs very carefully and replace the cells with the newest high capacity batteries.
Always looking to save a few dollars, it all adds up.

All the best,
Karelian
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Getting reacquainted with the TDI (no replies)

February 27, 2017, 7:14 pm
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Recently, picked up a used TDI with Reg's mods. Extreamly smooth, my third TDI and the best of the bunch with stabitly.

Been detecting a local park, using various coils mainly MinerJohn. Athough the Whites stock 12" is deep it doesn't fare as well as Miner John coils with EMI. Miner John coils are extreamly quiet even with the larger coils.

Today, dug my deepest coin from the park. A wheat penny measured 9" inches using a Periscope probe, this week before work dug 8 wheat pennies all between 6.5" to 9" inches in depth. I know some of you may feel 9" inches is not deep but for my area especially at parks that is deep.

No silver surfaced, but to get 8 old pennies from areas pounded by Explorers is extremely good. Currently, Using the 14" Miner John coil as it is the deepest and smoothest of the bigger coils even in areas with EMI. The original 14" prototype coil that came with the TDI has issues, works with high conductive but terrible with low conductive settings. But having seen what it could do with high conductive, ordered a new 14" miner John coil last week to replace the defective 14" coil.

These were dug using High Conductive setting. Also, I can't hunt with a low GB in my area as depth is lost. So i cranked up GB to around 8 and sometimes even higher, thats were im getting depth for high conductive coins and using high gain many times with maximum Gain settings.

Have a used 14"x16" Miner John coil on route as it should be here this week, looking forward to conparing it with the 14" miner John coil.

Plus, Using the 5"x10" folded Miner John coil for school yard gold jewerly hunting with Low Conductive mode. Remarkable performance with hardly no iron surfacing, what does fool me are hair pins.

For gold jewerly, Using 10uS setting. Gain at max, GB between 8 to 11 using Low conductive mode. With these settings, simple turn on and go machine and dig to ones content. The TDI is now my official Gold Jewerly hunter for schools and soccer fields.

Here are my recent wheat penny finds, nothing spectacular but from a pounded park with just a few hours total these are good scores.

Thanks for your time,
Paul
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Finally, Latest TDI gets silver. (6 replies)

March 6, 2017, 4:54 pm
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Been hitting a pounded park near my area past two weeks, handful of wheat pennies but silver has eluded the TDI.

Today, Get an extreamly deep weak signal mostly one way. Using periscope probe, target sounded good and a measured 10.5" inches deep. Was either one of two targets, deep iron or deep wheat penny. To my surprise, out pops a 1908S barber dime.

Using a 12" x 16" Miner John coil, very deep and pretty much eliminates EMI. Can hunt in areas the stock TdI coil can't, impressive depth the TDI made me a believer never would have imanged getting a silver dime this deep from a park. In my career, this is by far the deepest park dime ive dug, have dug wheat pennies at this depth but never a silver dime.

Using high conductive settings that work for my area.

GB at 11
Delay 10uS
Gain maximum
Faint threshold but not were its choppy., soft constant threshold.
High Conductive toggle setting

I run a high GB, this is were my TDI excels with depth with high conductive. Sure the ratio of iron increases but so are my older coin finds.

Thanks for looking,
Paul
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Coiltek 6" Mono Tdi coil test against NF Sadie, Miner John 6" folded mono, White's 150 etc.. (10 replies)

March 10, 2017, 12:24 am
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I've just obtained the new Coiltek 6" mono coil made for the Tdi series detectors. Give me a bit of time and I'll compare it with other small gold specialists like the Miner John folded mono 6", Miner John 9 x 5 folded mono, Nugget Finder Sadie 8 x 5 mono and whatever else I can get my hands on. Pity Coiltek didn't come to the party earlier but they are here now..

First impressions are that it is best mounted on a Minelab lower rod, it comes with mounting hardware for a White's lower, but the design and spacing dictates the use of a rubber washer, I just use the Minelab rod, much better fit..
Quick air test on 1 grain ingot, ten plus centimeters, Tdi Pro with gain at 5, 10us, GB off. Ok so just 4 inches+ with gain at half, that's 4 inches clear signal, whispers out to 15 centimeters + or 6 inches+ on 1 grain ingot. A good start.. those whispers stretched out further than other coils, but early days..
Again I'll do a proper test shortly, first air tests and a bit later hot ground to check stability and ground balancing etc.. different gain setting.. All and Low, etc.
A lot of small gold still to be found and a few decent larger slugs for the lucky few, so small gold coils make sense.

All the best,
Karelian
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Gold is a "low" conductor ? (4 replies)

March 10, 2017, 4:45 pm
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Regarding the REG SNIFF and STEVE HERSHBACH coin/jewelry settings (ie high gain, low GB, Delay10u sec. GEB on, conductivity switch High)...., I keep wondering to myself why gold is considered a low conductor while silver is considered a high conductor to the TDI when making adjustments to the ground bal. and conductivity switch....to the point that many remarks about it put gold being rejected along with iron......here is a partial list of metal ranked by conductivity that puts gold so much higher than almost all other metals that iron is barely on the same page....yet, when setting up the TDI to hunt coins, my understanding is that gold is going to be rejected......What am I missing???

Is it just that when setup this way that only high content silver or copper coins will be accepted high conductors and all other stuff including most jewelry, amalgamated metals and clad coins will be rejected along with gold, iron and all other metals unless they also have a high silver content?

Please bear in mind that I have only a couple hours with my TDI PRO as its been pouring down rain and so I can't really get out with my machine, so I am stuck with reading and trying to make sense of the ground bal. point/ conductivity setting interactions without being really able to put in the hours I know its going to take to start getting a handle on this. Thanks in advance to anyone who chimes in.......


Electrical conductivity(10.E6 Siemens/m)
Silver 62,1
copper 58,5
Gold 44,2
Aluminium 36,9
Molybden 18,7
Zinc 16,6
Lithium 10,8
Tungsten 8,9
Brass 15,9
Carbon 5,9
Nickel 14,3
Iron 10,1
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TDI PRO Chest mount and Miner John Coils (3 replies)

March 17, 2017, 6:15 pm
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I recently purchased a new 5x9 folded mono from Miner John, I took it out for the first time yesterday and was pleased with the performance, it allowed max gain, was very smooth, and pinpointed nicely even found me a merc. Unfortunately for me (I guess) I use the Pro in its chest mount configuration and the cable on the Miner John coils is to short, by about 2' to work well with the chest mount. I basically had no cable wraps on my shaft to get enough length to swing it to the side without having to turn at my hips to swing it away from my body. Sounds like no big deal except that when the cable comes straight off the coil to your controller you make a big triangle of cable between the coil/shaft/controller that gets hung up in each and every bush when you aren't out in the grass, and by the time I was done doing the swivel hip swing, I was pretty sore.

This coil is specifically advertised as compatible with the TDI PRO and so i made the leap of faith that it would be designed to work with the machine as it was designed to be used as one of the prominent features of the Pro is to be able to use it in a chest or hip mount config. That isn't the case and so I contacted Miner John and he graciously offered me a cable extender for $55 (over 1/3 the price of the coil), with the explanation that the guys in Oz didn't think it was necessary so he decided to shorten all of his cables. Would be nice if his website would state the fact that the cables are short and that they won't accommodate the PRO chest mount and tell you upfront that you would need to buy an extender cable.

It really doesn't bother me that he decided to have cables to short to work with the Hip/Chest configuration, its his product, what bugs me is he doesn't bother to tell you that and then wants $55 for a 2' piece of cable. I was a technology service merchant for 40 years and I never cheesed a customer like that in my life.

So my first experience is probably my last as his service sure ain't Whites......I guess the old saying "buyer beware" holds true...
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2016 and up SL version (no replies)

March 23, 2017, 9:07 pm
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Anyone know if the SL version for 2016,2017 is mounted on a different shaft than the standard S shaft ? Almost looks like the Pro version shaft.
1 of my competitors just bought 1 and it's not an S shaft

thanks
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Need help (4 replies)

March 26, 2017, 6:20 am
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I'm new to the TDI SL AND NEED SOME HELP. I'm in Virginia doing a civil war relic hunt and found a button and a pistol ball with my AT Pro. I dug an 8" deep hole and put the eagle button in the bottom and swung the TDI SL over the hole to hear what a good signal sounds like. It sounded great. Next I removed the button and dropped the pistol ball into the hole and swung over the hole. THE TDI SL did NOT pick it up.
WHY?
How do I set it up to hear a lead bullet?
Here are my settings
Gain - 6
Pulse delay - 10
GEB - on
Threshold - 12 o'clock
Frequency - 12 o'clock
Conductivity - All
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Couple of more silvers, (1 reply)

March 26, 2017, 5:06 am
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Been scoring several deep coins from two old parks these recent weeks, a good friend and I are getting masked coins with our Pi's.

Switched to using my two smallest coils with the TDI, 6" x10" folded and 8" x12" folded. What I'm finding is the TDI can get masked coins between the trash with smaller coils, today dug 8 coins between 6.5" to 7.5" inches deep with the 6" x10" mono. 7 wheat's and a Mercury dime, our Explorers and upper end VLF can't touch these type of masked signals.

These are not deep finds by any means, but due to masking they are beyond reach from our top end detectors. What's exciting is, Now we can go back to our old pounded parks and get these masked signals with our Pi's.

Recently upgraded to one of Reid's battery packs, and with the help of Reg coaching me with a minor change to my TDI for increased gain. Between the higher voltage battery and increased gain, Added about an inch depth to each of my TDI coils.

TDI is a great park machine, plant your feet on old park soil and the TDI will not let you down. Remarkable, And that's an understatement for this fun pi.

Pictured are today's finds on the 6" x 10" mono, and recent finds the past several weeks. Plus, Take a look at the Periscope probe thin rod in the ground, after locating the coin took a quick pic. It measured 7.25" inches in depth and the coin was actually the silver dime, was using the side of a Whites pin pointer as a ruler to measure depth. My deepest park coin is a measured 10.5" inches, had a few at this depth but the bulk of them are between 6" to 9" inches.

Thanks for looking, and thanks Reg for the mod coaching. Appreciate the help!

Paul
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Added some depth to the TDI (1 reply)

March 26, 2017, 7:48 pm
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Recently, Reg suggested I make change to my TDI. This is information he has posted before, with his permission I'm going to share my experience's with adding this mod.

My TDI has the preamp mod with the better IC, What this did was improve stability it's very smooth. Thus, Allowing more gain in area's with EMI or areas one may have issues with noise.

One of the other mod is shorting out a capacitor, This eliminates a third filter. Reg explained what I needed to do, followed his instructions and completed the mod. With this particular mod, Greatly adds depth and now the faint one way signals are a two way signal. Earlier, I was generous and mentioned it added an inch in depth. But it actually adds more under right conditions, was amazed seeing the extra depth.

Later, Added a switch so I can use the mod with either on or off position. Didn't have too, But I like knowing can always switch back to stock performance with the flip of a toggle switch or to boost mode when ground conditions allow. Without the switch, the user will need to reduce gain if they want too hunt in areas to reduce noise. This added switch with the lead's hasn't shown an issue, and it may but so far I'm not seeing any problems.

Shorting this particular capacitor was one of the mods Reg and his friend Paul were doing, Reg has this information out there on the Internet if you want to Google it.

Also, Recently purchased one of Reid man's battery's. Wow, well made and it auctally added some depth. However, The mod I'm sharing above greatly increases depth and strengthens those weak signals. From both air testing and from my test bed, anywhere from 1 to 2 inches depending on the size coil.

With Reg's permission, here are a couple of pictures with the shorted capacitor mod eliminating the third filter. I've added a switch with the leads soldered to the cap, Secured with heat sink tubing to secure the soldered wires with the capacitor so it doesn't wiggle loose out in the field.

I know Reg has mentioned this before, and I agree please don't do these mods unless you are comfortable with these things.

Thanks to Reg, the old TDI can be a TDI Pro.

All the best,
Paul
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Recent Discovery (no replies)

March 28, 2017, 6:21 am
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Recent discovery of the conductivity switch on my White's TDI SL.
The video shows what I've found.
It also works the same with the 7 1/2" dual field coil.
Just the opposite happens if you run the machine with the conductivity switch to high, low conductors are also heard.

More information to follow......

https://www.youtube.com/watch?v=D6KEe3liOtY
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Quick TDI relic hunt (10 replies)

April 10, 2017, 10:32 pm
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We have a old 1850 settlement near my area, farmer allows a friend and I access to search here anytime. About all that's left is old lead, tons of iron and once in a while an old button or old coin surfaces.

My main relic detector here is the GPX, yesterday tried the TDI which is my first time using a TDI for relic hunting. Up until yesterday, I've only used a TDI for park or gold jewelry hunting.

Wow! Wasn't expecting much difference between TDI park and relic hunting, thought I would gracefully adapt and pull finds up by the handful conductive finds that is. In stead, iron surfaced with ease sounding like good conductive signals.

Was tempted to switch to the GPX, I know it's capabilities what it can and can not do. But, Struck with the TDI managed to get a few pieces of old lead after switching to a smaller coil. Until I get used to using the TDI as a relic matching, will use smaller coils before moving up to the larger ones.

Was different, dug a higher ratio of iron with the TDI. Maybe it was me, not really accustomed to the TDI as a relic detector but put me and the TDI in an old park we always manage to get an old coin or two.

Hand's down the TDI in a park is clearly better than the GPX, but relic hunting think that's were the GPX has an edge and that's due to discrimination. Over all, I'm not giving up with the TDI going to master it in relic hunting.

Before I forget, With recent post with the SL using the Pro handle. I've never tried an SL with an S-handle, so temporary mounted my TDI on a Mars shaft to see how it swings. My GPX is mounted on one and it auctally swings well, fold's down for storage or hiking in long distances. I've found this shaft is great for these purposes, can fit inside a backpack as well.

Until the next TDI relic hunt, these are my first TDI relic finds. Iron is ok, especially from old settlements but it's nice to sometimes pass iron up to increase ones odds for a button or old coin.

Paul
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