I think Dave and Adrian's conclusion is correct. My take: for a SDR, if no signal was converted during the A to D stage, there will be no signal to "dig out" during the D to A stage. No amount of signal processing or noise reduction will help since there is nothing there. Nothing is buried in the noise floor.
Ron N4XD Sent using https://www.zoho.com/mail/ _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
