On Thu, Dec 4, 2008 at 2:23 PM, Bill W4ZV <[EMAIL PROTECTED]> wrote: > > Nico, this is truly exceptional phase noise performance! My sincerest > congratulations to you. Have you described how you achieved this somewhere? > > 73, Bill W4ZV >
Not to speak for Nico, but direct sampling SDRs use a crystal oscillator for the ADC encode clock which obviously can be built to have very good phase noise. The LO generation and mixing is all done in the digital domain in the FPGA so there is no degradation of the crystal oscillator's original phase noise specs. This is not always the case for DDS/QSD based SDRs due to reasons described earlier. 73 Phil N8VB _______________________________________________ Elecraft mailing list Post to: [email protected] 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
