Hello All, I am trying to add AO-73 to SatPc32 so I can have CAT. I have added the following line to the doppler.SQF file AO-73,145955,435145,USB,LSB,REV,0,0 and am unable to get it to work.. I have successfully operated CAT with SO-50 and FO-29.. Thank-you, Michael A. Foster – N8iup