PI Vs VLF Air Tests

		Quote:			Posted by Ridge Runner
	So they are not a Simple matter of 2 Radios, One Sending and one Receiving , It is more like us we Shout in A Canyon and wait for the Echo, Only the PI is doing this from 700 to many 000s times A Second,

Actually a PI runs at a very slow pulse rate (+- 90 to 120 p/s) but then the amount of EMF that it sends on each pulse is huge, this EMF is sent back as eddy currents, iron being the one that sends the most back and gold the least. Because the PI sends this big pulse gold can be detected at more depth this also makes it possible to detect small gold close to the surface. When the pulse has been sent the detector TX is turned off and the RX is turned on after a delay of a few uS, so yes it is a bit like being in a valley and waiting to hear the echo except that an echo is heard a few times but our piece of gold discharges the eddy currents only once after every pulse that it gets so actually it's more like firing a gun, the sound only comes once after the bullet has gone.   

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Xavier

  Yes X like Echo location.   If they can do Distance with a Laser by measure of time we could do Depth in a PI.  No Mater what the Target is by time.

Posted on: August 13, 2015, 08:20:24 pm

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We need to figure out a way to Exaggerate the Response.

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		Quote:			Posted by Lord Dracon
	GPR is cool to find larger objects ATM, but still needs refining to find the smaller stuff. needed to be like HD not just standard broadcast on a big screen. those units look pretty heavy too!... suppose it will only be a matter of time before they use a muti-frequency version for both large and small objects - if that's possible. also I wonder if a PI could be used to map an area in conjunction with VLF and GPS... maybe that is what whites is working on

Well I have A few Whites Machines, And I can't Fault them, If the do bring out something New I will most likely Buy it, There is One Machine that I will never Give up no matter what they Bring Out, I also have other machines on Back Order too,

RR

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		Quote:			Posted by xavier
	The best way to go that I know of is to have two coils the Tx made with 0.8mm wire and the RX with 0.25mm wire and many more turns for a better reception, I was thinking of having the RX coil to ground while the TX coil is turned on but this is just an idea.

X Dude,turn on your Skype

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		Quote:			Posted by Lord Dracon
	hey X, this is something I've been thinking about for a while now... just seen this post.. lol check out my post (today's) re Surf PI and pinpointed functions and second coil.. lol .. again my main concerns are loss of sensitivty and flyback voltages ... but I'm sure this has a work round  also if. using 2 samples one on each coil the depth could be calculated ... theoretically... would just need a fast enough chipset/Microprocessor to perform the necessary calculations. as tx fires an initial pulse will register on the RX, then the flyback from the target will register (second pulse) the distance between the two will be your measure of depth....   again just an idea

Yeah wot you said, Xavier explained the working politics of a PI to me, Although I have owned a couple and Know how to work them the internal side of things can be a bit Daunting, if you are not well versed, Aye

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