Hello All, I am trying to build a 2-pol spectrometer in a ROACH 1. I started with the Casper mlib_devel PFB+FFT but I ran out of slices so I swap the PFB for the one used at VEGAS (taken from the monroe_library_latest) on the git repo.
The model compiled but I am having problems with synchronization. The zero channel jumps around every time I run the bof (It can be anywhere). I check my sync pulse, replace the sync_gen block from the latest mlib_devel and fill the parameters following the Chen,McMahon,Parson's paper but I am still having trouble. I am aiming for a 4-tap, 2**12 points, 8 simultaneous inputs spectrometer. The sync_gen block as well as my calculations from the paper's formula gives a minimum sync period of 36864. I am using N_acc (scale) = 512. I have tried the sync_gen block as well as the configuration (counter+comparator) suggested on the sync pulse usage paper but neither seems to work.On simulations the pulse looks ok for both cases. Have someone ran into similar issues? Cheers, Ricardo. -- Ricardo Finger Camus Electrical Engineer Astronomy Department University of Chile Of: 56(2)9771122 Casilla 36-D, Santiago. http://www.das.uchile.cl/lab_mwl/
