I found this video posted by Gary Pearce, KN4AQ with HamRadioNow at the Orlando HamVacation. Greg Jurrens, K5GJ, from FlexRadio discusses software defined radio.
What’s SDR? And what will it do for you? FlexRadio’s Greg Jurrens K5GJ runs through the basics with Jeff & Gary. FlexRadio itself is sort of a tutorial, as they’ve transitioned through a few iterations of how to do SDR. So no, it’s not a 60 minute commercial for Flex. More like a 30 minute commercial for Flex. But really, it’s hard to separate.