At 12:04 PM 1/24/2010, you wrote: > > >Thanks for your explanations, Bob! > >I understand the principles of driving the mixer with a squarewave >signal and that you use a comparator to change sine to squarewave. > >Where I'm failing at is the trick how to receive 30 mhz with a DDS >that make 37 MHz max without getting problems with nyquist. Can you >use a comparator to double your VCO frequency without getting >problems at the duty cycle? > > >Stephan >
This is a mixer, you are not trying to digitize the 30MHz signal where you would need a minimum of two samples, instead you are mixing it down to the base band. Cecil k5nwa www.softrockradio.org www.qrpradio.com < http://parts.softrockradio.org/ > Never take life seriously. Nobody gets out alive anyway.
