J. Fielden <[email protected]> wrote: > is the kx3 receiver RF direct sampling or ?
Hi Jim, The KX3's architecture is pretty unique. First, we use a quadrature downconverter to get I and Q signals at a baseband (zero Hz) I.F. Using a zero I.F. allows us to insert optional high-performance analog roofing filters into the path, protecting the A-to-D converter and DSP from out-of-band signals. The roofing filter module includes a narrow filter for CW and a medium filter for SSB/DATA. When the filters are installed, the KX3 has blocking dynamic range of nearly 140 dB, higher than that of even the most advanced direct-sampling radios. (But not quite as high as the K3S, which uses a superhet architecture with crystal filters to obtain off-the-charts dynamic range in the 150 dB range.) With the filter module, the KX3 places 5th on Sherwood's receiver performance chart: http://www.sherweng.com/table.html Even without this module, the KX3 receiver would still be in the top ten. That's the long answer :) 73, Wayne N6KR ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
