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Just mailed off to Mouser for the parts for the Proscan PI unit. I built the GoldPic3 and have shelved it as it didn't work right off and with the ideas I want to try the Proscan unit is much easier to modify since it doesn't have a uP.
First thing I want to build is a Time Gain Amp and the second thing is a 8-tap delay line to add the pulses over and over with each pulse, thereby giving a better S/N. Carl, I think you'll remember this if you looked over RADAR signal processing techniques, it's called "Video Integration". I would have a variable opamp delay ckt. to set the point at which I want to begin to add the return pulse. I think there's lot's of work to be done in this area and of course as mentioned on the PI forum, I am very interested in using a Spectrum Analyzer as you get alot more resolution than looking in the Time Domain. I've also bought a couple 12V latern Batts. from Radio Shack and 4-4' copper ground rods to put a DC potential in the earth to experiment with enhancing my VLF detector. I think this is what Compass Electronics is doing with their Depth Doubler for $495. I've only done a quick test in the backyard and inconclusive with the nugget I placed in the ground, but sure got alot of signals that showed up when the 24VDC potential was applied to the ground. I'm going out to the El Paso Mtns. tomorrow in the Mojave Desert and will try the DC setup again and see if I find any nuggets.
Randy Seden-Simi Valley, CA.
First thing I want to build is a Time Gain Amp and the second thing is a 8-tap delay line to add the pulses over and over with each pulse, thereby giving a better S/N. Carl, I think you'll remember this if you looked over RADAR signal processing techniques, it's called "Video Integration". I would have a variable opamp delay ckt. to set the point at which I want to begin to add the return pulse. I think there's lot's of work to be done in this area and of course as mentioned on the PI forum, I am very interested in using a Spectrum Analyzer as you get alot more resolution than looking in the Time Domain. I've also bought a couple 12V latern Batts. from Radio Shack and 4-4' copper ground rods to put a DC potential in the earth to experiment with enhancing my VLF detector. I think this is what Compass Electronics is doing with their Depth Doubler for $495. I've only done a quick test in the backyard and inconclusive with the nugget I placed in the ground, but sure got alot of signals that showed up when the 24VDC potential was applied to the ground. I'm going out to the El Paso Mtns. tomorrow in the Mojave Desert and will try the DC setup again and see if I find any nuggets.
Randy Seden-Simi Valley, CA.
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