Taper Functions, Input Levels, and RFI Excision Taper Functions, Input Levels, and RFI Excision Three input data taper functions are available for tayloring the spectrometer's instrumental profile to special purposes, and others could be added to the software without much trouble. The improved isolation comes at the price of slightly poorer resolution and some loss of sensitivity. The parameter TA is used to specify the taper function.
Y turns on the half-window time offset.
S which balances the input levels just before the beginning of each scan. This would normally allow full amplitude range for the largest possible narrowband input signal, but the noise power would be confined to the lowest few bits. The input word shifting range is from 2 to 5 bits, which is equivalent to an output power word shift of from 4 to 10 bits. The bit shift parameter is WS, whose default value is 2. The wide dynamic range inherent in the FFT spectrometer should confine the effects of narrowband interference to a relatively small number of spectral channels.