First observations of the initial radar node in the Puerto Rico TropiNet X-band polarimetric Doppler weather testbed. - Miguel B. Galvez; Jose G. Colom; V. Chandrasekar 001; Francesc Junyent; Sandra Cruz-Pol; Rafael A. Rodríguez-Solís; Leyda V. Leon-Colon; Jose J. Rosario-Colon; Benjamin De Jesus; Jose A. Ortiz; Keyla M. Mora-Navarro (IGARSS, 2013)