The 1350 faa radar creates aliases in the alfa band
when the digitizer has the radar in band. The plot shows the location
of the aliases versus sky frequency (.ps) (.pdf)
for the 100 Mhz setup. The aliases are the 2nd and 3rd harmonics of the
radar at baseband. They could also be produced in the 1st IF after the
100 Mhz filter. For more info on how this is happenning see: faa
radar aliasing in band