RadioProcessor
Most NMR/NQR applications will require that the RadioProcessor can capture a certain bandwidth around
the spectrometer frequency (or IF frequency). To show that the amplitude remains the same when the input
frequency is changed, an additional signal was captured - at 65 MHz, as shown in Figures A1.5 on the next
page. A 75 MHz value would fold back to the apparent frequency value of 0 Hz. Any larger offset of the input
frequency at this specific sampling frequency would result in a fold back into the same spectral region, making
it indistinguishable from each other. Therefore, when the center frequency is 70 MHz, the maximum usable
bandwidth that can be accommodated in the undersampling mode without distortions is +- 5 MHz.
2020-10-07
34
Figure A1.4:
70 MHz signal directly captured (undersampling).
www.spincore.com
