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Recent content by Eric Foster

  1. E

    PULSES FROM THE PAST

    This is the first belt mounted underwater P.I. that I made. It was a 'one off' and made for a professional diver who was searching for a valuable platinum ring with several diamonds. It was lost off the end of a pier somewhere in the UK, but I can't remember where. The ring was found, and that...
  2. E

    Detectors in a Pelican Case

    Hi All, I am in the process of re-housing the electronics of a Vallon P.I. mine detector and plan on using a 1050 Pelican case. I would be interested on hearing from forum members who have used this type of case. i.e. problems; reliability; is the gasket good; does the purge valve leak; any...
  3. E

    I'm Back!

    I must have polarized my brain cells with all those magnetic pulses I have absorbed over the years. It's impossible to retire from P.I.. Here I am at a local beach a couple of weeks ago getting back into the swing of things.
  4. E

    BAD GROUND ANALYSED

    I have recently had discussions on an Australian forum with Prospector Al about some bad ground on a gold detecting site, which is part of a claim being worked by Sawmill, a professional prospector. This ground was reported as being so severe that
  5. E

    DECAY CURVE PLOTS

    Here is a bit of history as these plots were done by me in 1967. The object was to look at the responses of different width brass rings and see how it affected the rate of decay. It also demonstrates that the response is that of the object which previously had been subjected to a magnetic field...
  6. E

    Greener Living, More Noise.

    I have converted one of my rooms at home into a supplimentary workshop for PI tests and experiments. Here I have been working on a low noise front end but was puzzled as to why the noise level went up considerably in the late evening. Changing the coil orientation did nothing as did neither...
  7. E

    2010 Lesson 1 - Flyback

    A common misconception is that the voltage flyback pulse has a direct bearing on the signal from a metal target. PI theory shows that it doesn't. The voltage pulse occurs simply because the coil becomes almost open circuit at the end of the TX drive and the collapsing magnetic field tries to...
  8. E

    Back from Australia

    Just back from Australia where I had a very pleasant and productive three weeks. In Victoria I met and worked with some professional prospectors at various sites in the bush and conducted tests on different size nuggets, and of course the highly iron mineralised ground. It is very important to...
  9. E

    Thank you all..

    once again for your support and messages. The funeral was last Monday and all went well. There was over 150 at the Memorial Service. I am now in Ireland for a break with our son Eddie and his family. Problem is that I fell on the first day and dislocated my left shoulder. More hospital visits...
  10. E

    P.I. Tuned Marker Locator

    Most PI experimenters have found that if there is an unused coil close to an operating PI, then a ringing waveform will appear on a scope connected to the first amplifier, that cannot be damped out. Even reels of hookup wire under the bench will re-radiate this ringing over quite a considerable...
  11. E

    More Good TDI Information

    See posts since 18th July at http://bb.bbboy.net/alaskagoldforum-viewthread?forum=2&thread=71 Eric
  12. E

    New Instrument that will Advance our Knowledge of Magnetic Ground

    In order to better understand the problem of magnetic soil and how it affects PI metal detectors, for the past 18 months I have been busy designing a Magnetic Viscosity Meter. Used in conjunction with a Bartington MS2B susceptibility meter, it has proved invaluable in classifying different soils...
  13. E

    GS5C in the Garden

    A garden, or backyard, is not normally the place to go hunting with a P.I. Bits of rusty iron, nails, and all sorts of trash, litter the ground down to several inches, particularly where we live, which was once part of a farm where there were lots of outbuildings and sheds which have long been...
  14. E

    Oz Ironstone Plots

    For those interested in waveforms here are a couple of plots done with some new equipment I have designed. [attachment 85037 Oz1000.jpg] This is a linear plot and shows the rapid increase in ground signal strength at short delays. In fact I could not use 10uS because the instrument overloaded...
  15. E

    Changeover Switch

    I seen that the GPX4500 has a switch to turn off the ground balance. What a neat idea! In the GS5C the switch has disappeared, and replaced with something more useful. Eric.
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