SA2009 in combination with BT-20 (on a USB cable) seems to be less sensitive than SA2007 was with LT-20.
I don't know where the filtering/sensitivity settings are, but I can put either the BT or LT above, below, left or right of my Garmin Zumo that is happily tracking 3D and the SA software stays in the acquiring mode for 1/2 a day.
The "sat info" tab shows maybe one or two red satellites, the rest in gray, no green ones.
I know I have a clear view of the southern sky, as I said the Garmin Zumo tracks just fine from that dashboard location and I can put the delorme puck over, under, left or right of it, but it still doesn't recognize enough sats to get a fix.
So, IS THERE software filtering of the data stream ?
e.g. check summing as a sanity check ?
and does it just discard messages that fail the checksum ?
I would LIKE to have ECC on the messages, but maybe that is expecting too much.