[casper] Tutorial 3 Calibration Problems

Hi All, I am working with the Phil Lubin's Deepspace group at UCSB on a ROACH based spectrometer. I have been testing tutorial 3 using a 1 Volt peak to peak sine wave with a frequency of 20 MHz. When set the gain to a reasonable level it outputs a sharp peak in a consistent location, but the

Re: [casper] Tutorial 3 Calibration Problems

hi tim, i suggest you phase lock your 20 MHz generator to the frequency synthesizer that's generating the adc clock, and setting the input frequency to the exact center of a spectral bin. (that insures that every spectra will have the same exact and integer number of sine waves in it). for