On Tue, Dec 2, 2008 at 6:49 AM, Paul Christensen <[EMAIL PROTECTED]> wrote: >>> Its dynamic range may be OK for IMD but today's SDRs cannot approach the >>> BDR of >>> rigs like the K3 until even higher resolution ADCs become available. > >> Sorry to tell you a bad new: you are wrong! > Nico & Phil, > > When can we expect to see direct R.F.-sampled SDRs with better MDS > performance? When we compare MDS data across QST product reviews in a 500 > Hz filter B/W, we see marginal figures of ~ -128 dBm @ 14 MHz. This is true > of the Perseus, SDR-IQ, and Flex 5000A. > > By contrast, radios such as the K3 and Orion offer excellent MDS figures > approaching -140 dBm while still providing excellent close-spaced > blocking and I3 dynamic range. > > Paul, W9AC >
Hi Paul, There is no inherent reason why the MDS could not be that low in direct sampling SDRs. It is mainly a matter of design decision/implementation. -- Phil Covington Software Radio Laboratory LLC Columbus, Ohio http://www.srl-llc.com _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
