receiver. I think this would be a very nice idea for a FLEX rig - a direct bus interface, even though it does require a tower config, and one has to be serious about the RFI issues.
What advantages would it give the user ?
compact (if ~high-current) solution. Streamlined PC-SDR communication: DMA could be used.
Interesting thoughts. Only a few small shielded sections.
Up to Antenna AD needs protection from internal PC noise
Everything up to DA for transmitter is digital - unshielded
DA out may/may not need shielding. Only need enough power to drive external amplifier - Say QRP 5W on card and external PA option.
The easiest way I can think of to do this would be to have the radio card duplicate the bus-level (register) interface of a well know NIC. In that case, everything on the host side could remain unchanged. That's a big change for the Flex hardware/firmware all around. And I'm not sure what it would gain, frankly.