A
Anonymous
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I have a chance to drop in and see how things are going. I thought I would chime in on the topic of frequency and Time Domain and Frequency Domain.
One patents deals almost entirely with the Time Domain aspect of the Explorer. It is the retangular dirve to the coil and front end of the receiver. The block diagrams and other drawing is more concerend with ground compensation, the pulses to the TX coil, demodulators, they show three demods that are in pairs of two each for mid, low and the high frequencies. Once it leaves the demodulators and is filtered that is pretty much the end of the explanation so one would think this is just a Time Domain thing.
The second patent deal with the Frequency Domain and discriminaiton and is where you will find most of information I often talk about becaue it is the discrimination and Id that is the problem and not depth with multiple frequency or single frequency. Just about any good VLF and PI will get all the depth needed.
The third patent is fairly simple and deals with the coil. All three are listed in the back of the Owners Manual and can be looked up on the Internet. I have gone through them and "think" I understand what they are saying. As always there are areas that they don't go into as it is just how things are done with many electronic devices.
So it depend on which area you discuss as to which is best in terms of time domain or frequency domain <span style="background-color:#ffff00;">in my opinion</span>. If you look at the front end and don't get into the demodulators and the output of this section then it is time domain. Once you get past that then it is frequnecy domain.
<STRONG>The Explorer is different in that it is a groups of detectors that fall under PI or pulse induction. Minelab got past the discrimination problem by usng both frequency domain and time domain and the problem with power consumption by most PI detectors.</STRONG>
It does use 28 frequencies, it does shift these as far as the specturm is concerend with the bottom and top frequencies set. They are critical to discriminaiton and the pulse cycle, one narrow pulse and one long pulse is how they reject the soil minerals, discriminate and id metals. Noise cancel is very important and should be done over ground with no targets present.
Have a great Christmas and Holidays,
HH, Cody
One patents deals almost entirely with the Time Domain aspect of the Explorer. It is the retangular dirve to the coil and front end of the receiver. The block diagrams and other drawing is more concerend with ground compensation, the pulses to the TX coil, demodulators, they show three demods that are in pairs of two each for mid, low and the high frequencies. Once it leaves the demodulators and is filtered that is pretty much the end of the explanation so one would think this is just a Time Domain thing.
The second patent deal with the Frequency Domain and discriminaiton and is where you will find most of information I often talk about becaue it is the discrimination and Id that is the problem and not depth with multiple frequency or single frequency. Just about any good VLF and PI will get all the depth needed.
The third patent is fairly simple and deals with the coil. All three are listed in the back of the Owners Manual and can be looked up on the Internet. I have gone through them and "think" I understand what they are saying. As always there are areas that they don't go into as it is just how things are done with many electronic devices.
So it depend on which area you discuss as to which is best in terms of time domain or frequency domain <span style="background-color:#ffff00;">in my opinion</span>. If you look at the front end and don't get into the demodulators and the output of this section then it is time domain. Once you get past that then it is frequnecy domain.
<STRONG>The Explorer is different in that it is a groups of detectors that fall under PI or pulse induction. Minelab got past the discrimination problem by usng both frequency domain and time domain and the problem with power consumption by most PI detectors.</STRONG>
It does use 28 frequencies, it does shift these as far as the specturm is concerend with the bottom and top frequencies set. They are critical to discriminaiton and the pulse cycle, one narrow pulse and one long pulse is how they reject the soil minerals, discriminate and id metals. Noise cancel is very important and should be done over ground with no targets present.
Have a great Christmas and Holidays,
HH, Cody