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About Chet

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    Northern California

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  1. Jonathan What outstanding information! Minelab should hire you to rewrite their manuals! Good manuals sell products. I will take this information to the field and put it to work. Thank you and have a great day, Chet
  2. I have been using the SP01 with two shoulder speakers for some time. And the separate volume control is better than just the 7000 volume control. Recently to reduce weight I removed the SP01 and speakers and went back to a single WM12 on my right shoulder. I also removed a bunch more stuff off of my harness and belt. It feels a lot better now. I may go back to the SP01 latter.
  3. Northeast and Arky, I am hard of hearing so I run the volume around 14 with the WM12 speaker. With mild ground I run the Sensitivity at 20. My first 7000 also had a noise problem when the battery would get around 50 percent down. It would get very noisy; if I put it on the car charger for 10 minutes it would quiet down until the battery got low again. Minelab replaced it quickly with help from Gerry’s. OZMOG’ I agree the 7000 is in general noisier than the 5000. On the right side chart where I have added the Bold Threshold numbers; my machine sounds like its running near the top rather th
  4. For years I ran the GPX 5000 Threshold setting with a faint audible level by following the book; which is condensed as follows; Through a process of dynamic noise compensation, Smart Electronic Timing Alignment (SETA) ensures that the threshold stability is improved and maintained, allowing you to operate the GPX 5000 with maximum efficiency under all conditions. Threshold is the constant audible background hum or noise produced by the detector. On the front panel rotate the variable Threshold control to achieve a very faint but still audible noise level. It should be smooth wit
  5. Guitar pickups are sensitive to steel or iron. So use a small piece of tape or glue to attach a light piece of iron to the leaf. Then tap it like tapping a tuning fork. Get very close to the pickup by removing the strings.
  6. Thank you that is good information. Need to study it more.
  7. Hi Green Nice work. Could you provide the weights and diameters of the lead shot. Maybe display them next of a mm scale or 1/4" graph paper like the nugget displays. Have a good day, Chet
  8. I have Red stapler and am keeping it until you show me to the patch 😄 Happy New Year! Chet
  9. The shape and angle of the target distorts the magnetic field which causes inaccurate pinpointing of the target. If the object is a spherical shape such as a BB or if a nail is in a vertical position then pinpointing will be fairly accurate. Hot rocks and mineralization may also cause some distortion. Soft iron has the most effect since it combines/concentrates and intensifies the magnetic lines of force. Gerry’s techniques above are about the best you can do to save on digging so many big holes. The attached drawing is an approximation of how the transmit and receive magnetic f
  10. If it was so easy with a metal detector then many in the Philippines would not be mining in deep mudholes such as in the following. https://www.youtube.com/watch?v=8psB-o-er5k
  11. Looks like good country to look in and just being there is great. Recommend reading this post if you haven’t already. My Tips On Nugget Detecting With The Minelab Equinox https://www.detectorprospector.com/forums/topic/7468-my-tips-on-nugget-detecting-with-the-minelab-equinox/ Have a good day, Chet
  12. Mitchel Running over the detector and breaking the lower shaft says a lot about how well the Russian coil is built. It was supporting a huge weight from a loaded vehicle. Have a good day, Chet
  13. This is an excerpt from one of my previous posts; It is reasonable to be concerned about interference from the two connectors being located so close to the coil. This is not a problem since the detector only detects motion change relative to the coil. A simple experiment will demonstrate how the detector nulls out metal that is not changing position relative to the coil. Place a small test target (0.06g) on the ground with an aluminum soda or beer can about 2 feet from it. Swing the detector over the small test target. You will only hear the response from the large can.
  14. Using other materials that Jason mentioned can be used on small coils where the coil is wound around a small core. Small AM radio antennas use a ferrite core to great advantage. Some pin pointers and metal detector probes use ferrite rods to reduce the size and concentrate the magnetic field. But the cores weigh more than the wire wrapped around them. Any material used must not dampen the high frequency positive and negative transitions of the ZVT waveform. Which is much higher than any VLF frequency. I haven’t seen an example of using a light weight dispersed or a ring of mat
  15. In the ZVT function there is an abrupt square wave transition between reversing high positive and high negative current levels. The transition periods are a high frequency function that requires Litz wire for efficiency. The Minelab and Russian GPZ coils both use Litz wire in the Transmit and Receive windings to reduce high frequency energy loss. Magnetic eddy currents from nearby wires have opposite polarity and cause energy loss in coil windings. There is less energy loss in single layer Spiral Litz windings since there are no adjacent wires above and below the single layer
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