The aerostat is a tethered balloon radar that flies above lajas puerto and is used for drug interdiction. ... 160 usecs per frequency, 320 usec for a frequency pair (sequential in time) . ... Blanking . The radar is blanked for 42 degrees of azimuth (1.43 secs) centered on the arecibo direction. ... The radar is also blanked for 14.5 degrees (.48 secs) when it points at the san juan airport (or maybe the radar). This occurs 73.5 degrees (2.45 secs) after the start of the AO blanking. ...