EngCon..
http://xaxero.com/downloads.htm or
http://www.dxsoft.com/en/products/seatty/
both give you access to weFax with just an audio patch cord from your SSB receiver to your PC sound card.
NOTE: I tried to use the Grundig Yacht boy for this and never got good quality faxes. I think a better receiver with more precise SSB fine tuning is needed for good results. Dave...how do you get decent results on the Grundig. All i ever got reliably readable were the navtex broadcasts.