I am looking for a laboratory which has a 500 or 600 MHz Bruker NMR machine without digital filtering. I would like to send you one liquid sample in a NMR tube for a quick 1D NMR measurement which I would like to compare with my own measurement with digital filtering done on the same sample. After the measurement you can dispose the sample, no worries with mailing! I only need the data (zip-File by e-mail). The question is: how do hard-ware (Bessel-Type) and digital filters react on very high sample concentrations - which artifacts do the filters produce?
Have you tried to switch off the digital filtering? In Bruker NMR spectrometers you can set the parameter DIGMOD to "analog" and your spectrometer will work like the old AMX spectrometers, using analog filters and without digital filtering.
Digital filtering would produce spurious peak(s). Analog acquisition results in severe base-line distortion. These effects disappear if you use appropriate receiver gain and reduced pulse length.
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