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  1. AVXVA

    TDI Pulsescan modifications AND BIG coils

    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...
  2. AVXVA

    TDI Pulsescan modifications AND BIG coils

    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...
  3. AVXVA

    TDI Pulsescan modifications AND BIG coils

    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...
  4. AVXVA

    TDI Pulsescan modifications AND BIG coils

    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
  5. AVXVA

    TDI Pulsescan modifications AND BIG coils

    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...
  6. AVXVA

    TDI Pulsescan modifications AND BIG coils

    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...
  7. AVXVA

    TDI Pulsescan modifications AND BIG coils

    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...
  8. AVXVA

    TDI Pulsescan modifications AND BIG coils

    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...
  9. AVXVA

    TDI Pulsescan modifications AND BIG coils

    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...
  10. AVXVA

    TDI Pulsescan modifications AND BIG coils

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  11. AVXVA

    TDI Pulsescan modifications AND BIG coils

    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...
  12. AVXVA

    TDI Pulsescan modifications AND BIG coils

    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...
  13. AVXVA

    TDI Pulsescan modifications AND BIG coils

    "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)...
  14. AVXVA

    TDI Pulsescan modifications AND BIG coils

    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...
  15. AVXVA

    TDI Pulsescan modifications AND BIG coils

    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...
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