do you want to see if your receiver has the "right stuff" ? here is an
excellent test.
in the evening (about 0200-0700) tune to 6139.8 with your receivers basic
settings, you should get a terrible het (wiht 6140). if you can get rid of
the het and listen to the low power south american local with great clarity
then your receiver has the right stuff. if no het is present, then try later
when the station on 6140 is present.

the S800 can do it supurbly with its selectable side band sync. MOST
receivers can't even do a fair job or they take a lot of work to get barely
decent results. some of the receivers that can do it give poor fidelity.