Sorry Alan.... did not check the author on that item! Thanks for your comments. Yes, of course. I see now (the IQ theory) but not why there is a 24 kHz restriction.
Max,
No, I've not got a SDR-radio setup at the moment but as i described I thought the Softrock IF mode was capable of 48KHz span. The pictures on Simon's page are not clear enough for me to see the span shown there.
