On 8/20/2013 8:20 AM, Chip Stratton wrote:
Part of the difference may be lie in the ability of the KX3 to squeeze down to a much narrower filter width than the K2. Even at wider filter settings the KX3 is easier for me to listen to however.
I suspect a large part of the difference is that the IF filters in the KX3 are DSP, which can be better shaped to optimize the total response than the crystal filters in the K2. On SSB, the TX filter is used for RX in the widest position, but the narrower settings staggertune the filters, which produces a frequency response with lots of bumps and grinds, and sounds varying degrees of awful. Part of that is due to the phase shift associated with all of those filters. It's funny -- pro audio guys understand the importance of good phase response to good speech intelligibility, but RF guys generally do not.
The K3 and KX3 also have a lot less phase noise than the K2, which I would expect to show up when digging weak signals out of big ones (like QRN).
73, Jim K9YC ______________________________________________________________ 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
