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Now I'm studying at three (3) different coil designs in three (3) different sizes. 1) The 22" CoilTek mono coil, 2) The 21" - 17" DeTech SEF coil, 3) The 32" DeTech concentric coil. All are designed for the Minelab pulse inductors. As you know, application is large meteorites in western...

By the way, the ProScan TDI manual says (in several different places) that turning the GEB circuit ON reduces the absolute detection depth of the machine. Running the TDI with the GEB turned OFF is deeper. Does anyone know how much deeper? 10% ~ 50% ~ "A lot" ~ "Not much" Anyone? Thanks

Oh. My. God... As a matter of coincidence, THAT VERY THING happened yesterday. The TDI was running well, threshold purring consistently, and then it went blank. I swept that spot several times--same thing--the sound stopped. Couldn't figure it out. Today, I'm 80-miles away from it, and I don't...

How is everyone's winter going? Summer here has been remarkably bearable--no complaints. A couple of questions! With the GEB circuit turned OFF (Ground Balancing Knob = Inactive) the PulseScan TDI ground balances using it's internal circuitry alone. Is it possible to use the Threshold to...

Is there an online tutorial or book that provides a step-by-step (and I do mean `step-by-step`) explanation and parts list on how to make a DIY 1-meter (36-inch to 40-inch) concentric or dual-field coil for the TDI PI detector? I want to make a BIG coil that has wheels like a GPR unit--but with...

Does it make sense to use the TDI with a 32-inch coil for scouting gold? Say you`re way out in the desert with a dozen different dry washes that all look the same (in a 50-square mile chunk of country) and you don`t what has gold and what does not. The 32-inch coil covers a lot of ground. Can...

To answer XLOOXs question, the E-Trac VLF detector has automatic GB and it sees the 4-penny target at 13-inches on every Automatic setting. On Manual it sees it at a 10 out of 30 Gain (1/3) power. The E-Trac is unbeatable among VLF detectors--with one giant exception. ~> It is an aluminum...

THANK YOU! The manual that came with my NEW TDI Pulse Scan (in the box) was a pre-print Draft copy, and it is hard to read and not very good. Downloaded it and THANK YOU, once again. Rob

I had the TDI out the day before it snowed--a lot. I placed four (4) older Canadian pennies linearly in duct tape and buried them 13" deep. (Great for test gardens, old Canadian pennies are known for their high quality copper/tin (bronze) content and they sing on a VLF-machine exactly like...

Very often I detect abandoned homesteads and in and around little rural towns where a metal detector is still a true novelty. Almost every day I can and do detect a place that has never been metal detected before. Despite this, I very rarely find silver coins and I have never see a gold one in...

Another question, a little off topic, but I thought I would ask. I've notice a HUGE DIFFERENCE with both the TDI and VLF (ETrac) detector when detecting old, large iron. With the ETrac big iron objects scream at extreme depth--it's incredible. And also, there is a detectable halo around long...

Well... I'm back. More or less. (Headache and tired early in the evening.) Also, my youngest daughter and her fiance are now recovering from COVID. Daughter was 3x vaccinated and her symptoms have been mild, mostly fatigue. Fiance was only 2x vaccinated and he has fractured ribs from coughing so...

Please forgive my absence, I've been struggling with Omicron COVID and have been pretty tired. I am 3x vaccinated so the symptoms, beyond fatigue, have been mild. EVERYONE is this country has Omicron, had Omicron, or is about to get Omicron. My wife is recovering as well. This country has not...

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Here are photos of the 1:6 ratio Vernier controls for GB & Threshold modification that is available on US ebay. Description "If, like me, you've had trouble getting the Ground Balance and Threshold controls right on that ragged edge for nugget-hunting, this is your mod. These controls have a...

Thank you, Adrian ss for the link to this article! That really helped. Stupid me, in the area where I've been testing the TDI, the soil actual contains quite a bit of clay, and clay means iron mineralization. This is why my TDI is basically useless with the ground balance turned off--as you...

"Medal" detectors... Yep, I did that. I went out over the weekend and ran the TDI PulseScan over a long buried 8" iron pipe that is exactly five (5) feet under the ground. First thing I noticed--noticed it right off: I don't know what I'm doing without the GEB (Ground Balancing Toggle)...

Most of the American desert (Arizona, New Mexico, California) gold hunters are actively mining YouTube for Australian metal detecting content--it's the best way to learn the best techniques. And the big dream for everyone is to go to western Australia and find it. (I have to admit, I'm one of...

Hello all, I just registered on the forum for a single reason: I am seeking advice from the best medal detectorists on the planet--the Australians. (I'm in the States and I detect in Wyoming, Colorado, Kansas and New Mexico for about everything.) Several months ago, my wife bought me the last...