Minelab Explorer

[Cris Martin]

Hi Guys. Just bought an Explorer XS and so far it's super. Whether it's worth the extra cost remains to be seen. Those of you who know my Detecknowledgy site know I'm a tinkerer. So..... How exactly do we see this composite signal then?



Click Here (http://members.aol.com/omlcgm/detecknowledgy/detecknowledgy.htm)

[Carl]

I would love to finally see what the waveform looks like. I've been messing around with ideas in MathCAD but the composite that I came up with does not seem right. I will try to post it.

- Carl

[Carl]

http://www.thunting.com/geotech/forum/tech/images/ofdm.gif


Here is a MathCAD plot of 17 equally weighted frequencies starting at 1.5kHz.

If you slightly change some of the amplitudes you don't see a whole lot of change in the time domain. Of course, the frequency domain amplitude (via FFT) is pretty predictable. Likewise, changing some of the phases produces little change in the time domain, but the frequency domain gets pretty interesting. The amplitudes do not change, but the FFT phase plot is very sensitive. So using a DSP to analyze return phase info seems like a good bet.

[Sean Goddard]

Why stop with 17 frequencies?

Why not 64!!! Or by steping in 100Hz blocks, 940!!