GoldCTX, from what I understand of the Iron reject function it really does not identify iron. It identifies and discriminates any target with certain signal characteristics similar to iron. It will discriminate a nugget if its signal is similar. That is not true discrimination~ its just a signal cut off like a threshold adjustment. That information was in the literature when the first Iron cut outs came to be in ML. I've played with the function as well and a large piece of gold shallow sounds and cuts out just like a tin can.
I have no idea if the GPZ incorporates the same function or even if it can. Certain non-disclosure agreements are keeping that answer to them selves I think
*Steve* But I'm sure we'll know before long.
What Candy was describing was where the target signal response is picked up in the null created by the transmission.
As to the phasing that the video touches on I am pretty certain now that what is occurring is a nullification technique for the output pulse.
One big problem with current PI technique is that you have to wait for the transmit pulse to die off before the receive circuit goes to work. The result if you don't is a lot of noise induced into the receive circuit that will mask small target responses to the transmit pulse. This limits depth and sensitivity. In PI the transmit and receive circuits are tied to the same coils so its not just the ground that has to die down but the coils as well. In the ZVT they have separated the coils, added another receiver circuit and have modified the transmition pulse so that it does two things~ pumps the ground with the induction pulse to "ring" the nuggets bells and pumps again in reverse phase to nullify the induced pulse response of the ground. The nuggets will continue to ring but the ground goes quite. The two recievers at this point take notes and give signal response. The receive coils also receive a benefit from the transmit cycles activities~ due to proximity they will go quite faster than the ground and as a result have long window to look for the "ringing" nuggets.
Lots of other stuff to say but that's my basic impression of the working technique. Zero Volt Transmission is a good term for it.
The principle can be related to noise cancelling technique like a Bose headset.
Yep 40% more trash and bullets sounds about right. Hopefully they are shallow
The incorporation of a display makes me happy and hopeful that my thought on a signal graph and ground reference can be achieved. I've kicked the idea around for years and would like to see it without having to strap an android phone to the handle. But audio is almost useless without a ground reference. I don't see why the operation system could not be able to achieve this in the GPZ. So for that I do validate your idea on firmware upgrades that are useful CTX
Huntsman,
Radar theory is completely different than VLF and PI theory of operation. VLF measures distortion to the carrier wave transmitted and converts those distortions to useful data. PI induces currents into metals and then listens for the bleed off of those currents *eddy current ringing* as they die off. Radar sends a transmitted pulse and then listens for the return of the same signal from other objects it reflects from *as you describe and I know as fact as well* however the information gained is inferred not known for what is being seen. ie: a stealth jet looks like a bird or vice versa~ the information is inferred not known.
The two closest technologies that could give actual data on materials that I know of are X-ray and Terrahertz technology... The first is to dangerous to use and the second is still developing and I know of no portable method that would be effective for use.
