Originally posted by Geo
You understand I am not convinced your PD is detecting gold.
But let us take a hypothetical story and consider I am to take your PD with a gold sample in the coil and test it myself with my own hands.
And I observe it to beep at gold when I point it at a gold ring far in the distance.
The first thing I will do is not to look away from conventional electronics. I will first take some measurements in the circuit with high impedance instruments to see what is different when I observe it beeping at gold than when it is not beeping and gold target is removed from the test field. I would measure every stage to see what is really changing and causing the beeps. Then I would change the coil sample to copper and make the same measurements with the gold target put in the test field and then removed. This will give me some understandable base data to begin with.
Next, I would look closely at this base data to see what is the difference in the circuit signals at different stages of the amplifier when I took readings with gold sample and with copper sample put in coil. I would be paying special attention to very small millivolt differences that could be caused by thermocouple effects, and I would also be looking for slight differences in the eddy currents to see what effect they have on the front end small signals. I would do all this in a shielded and grounded work area so there are no false readings caused by tiny noise signals from the air. This is where I think a lot of errors are made by people who try to measure small signal differences.
After I make all these measurements, then I will probably see there is a difference in eddy current response from the gold sample that was placed inside the coil B field compared to the eddy current response from the copper sample. I would also probably find difference in the impedance that the same coil saw. I suspect I might find the gold sample caused less impedance to the coil. We know a normal metal detector VLF coil can see the difference between a small copper piece and a small gold piece. If I cannot see this difference in your more sensitive amplifier, then I would think I made a serious error in grounding my test equipment.
Of course, maybe I could just say it was not important to set up good shielding and grounding at a work station to get the exact measurements of small signal variations, because I already know there is no difference to be seen. But I would not do this, because I have already found from experience, that performing these small signal tests properly will show readings that I usually do not expect from simply guessing what I think the results will be. And I find that making proper measurements will usually show what is really happening inside the circuit instead of what we think is probably happening. This is where you will find out if the PD is really detecting gold, or if something else is making it beep. If you are lucky, maybe you will discover the gold sample is not responding like we expect it to from conventional eddy current electronics and the known resistance of gold. Maybe you will see how it is actually performing to help the circuit detect gold.
Then, after actually performing test point readings throughout the circuit from a shielded and grounded work area, if I see readings which show the copper and gold samples are not responding like conventional electronics tells us eddy currents and dissimilar metal junctions behave, I will think it is time to look for some more evidence in the field.
At this point I would set up some experiments to see how far I can detect a gold target. I would first find a large flat field that shows no signals at all from the PD, and then put a gold target in the field to see how far distance the PD can detect it. I would also move the target around in the field to see if the PD also detects it at the same distance. If it works as you say, then I will sign a contract with Carl-NC to take his $25,000 prize test.
And I will be happy that I have a true working LRL that finds only gold at long distances.
But remember...
This is only a hypothetical story I wrote that never ever happened in my experience.
I never saw a gold sample cause an electronic detector to find gold.
This is only the kind of thing I read stories about -- for magic PDs that nobody can demonstrate to work to find a hidden gold target from long range. I only hear stories...
So I am happy to believe everything is all true....
Same as I am happy to read fantasy adventure stories, and watch fantasy movies at the theatre.
These are very entertaining for good reading, and for good watching at the movies,
As long as I never pay 7,500 eu to buy these fairy tales, then I will remain happy with them.

Best wishes,
J_P




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