Oh, it is mostly over my head, but thank you for the explaintion. My frist transceiver was a Kenwood. They were at one time one of the best. Maybe Elecraft has started a new apporach to transceivers. N6XVT 73
Sent from my iPhone On May 16, 2010, at 6:38 PM, "Geoffrey Mackenzie-Kennedy" <gm4...@btinternet.com > wrote: > 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 <karl...@sbcglobal.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
