On 11/14/2010 6:46 PM, D. Peter Maus wrote:

...
HF aero comms are not all USB. Some are. Most are still AM. This is due
to the ability of AM signals of very low level to be noticed while other
comms are taking place, facilitating discovery in an emergency when
conditions are less than ideal.


Then, digital should have already replaced that. A program reading the
input to a sound card, from the audio off a receiver, is probably around
a 1,000 times more accurate, able to decode the signal -- of course I am
just guessing, but I bet I am close ...

Seems you have come up with another good argument to go digital ...

Regards,
JS