No criticism of Elecraft nor the K3 was intended, besides I do not have any good hard data as to the receive signal handling capability of the K3's DSP sub-system.
What triggered my comment was that the TS-590 is said to use only two roofing filters and it is claimed by the manufacturer that "it has the best receiver specs out there". If it is a superhet, this sounds suspiciously like a receiver that uses a H-Mode mixer, high IIP3 roofers, and a "strong" IF. The H-Mode is a type of mixer which appeared more than 15 years ago and yields very good "IMD" performance, better than most, and as far as I know is not yet used in commercial amateur receivers - I don't know why not. It will be interesting to see whether or not the designers of the TS-590 receiver have used a proper Gain Distribution analysis to obtain optimum IMDDR3 performance, which should include every "stage" or element in or which impacts on the signal path, this includes L-C filters, crystal filters as well as LO phase noise. It will also be interesting to see their approach to the LO, because a PLL based synthesiser whose cost is within budget would probably be too "noisy". All should be evident from the schematic when and if it becomes available. 73, Geoff GM4ESD On Sunday, May 16, 2010, at 11:30 PM, Karl Marderian <[email protected]> wrote: > For me and all others (I maybe the only one). Does this imply the > enginreers at Elcraft need to do some brushing up on designing of DSPs. > Are you saying their heterodynes aren't would they should be. > N6XVT 73 > > Sent from my iPhone ______________________________________________________________ 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
