Is there a non-engineer's guide to the Sherwood table for those of us who are not engineers?
In particular, the table is sorted by Narrow Spaced Dynamic Range, and I see that the FT5000 is listed first, but the K3 also gets a 101 in that column, albeit with a "pf" footnote instead of just an "f". I decode these footnotes to be "f" = "Measurement was Phase-Noise Limited" And "pf" = "Measurement was Phase-Noise Limited" and was "with 200 Hz 5-pole filter" OK - so why is the FT5000 at the top of the list? Why no indication of what filter was used in the FT5000? What is the second sort column for the table? What puts the FT5000 on top? What does this table really tell us? It seems that both of these receivers are pretty close as many of the numbers are similarly different from those listed below them. When a parameter is higher or lower - which is better? I presume that the higher the narrow-spaced dynamic range, the better, but what about 100kHz blocking (for example). Is higher or lower there better? The K3 is a 140 on that one, and the FT5000 is a "lowly" 127. The Down-conversion Kenwood 590 gets a 144 in this column - is that better or worse than the K3? But, the 590 only gets an 88 in the narrow-spaced dynamic range, so I guess that means it's much worse? How does one interpret this data? 73, Bob W5OV -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Bil Tippett Sent: Friday, December 31, 2010 6:18 AM To: [email protected] Subject: Re: [Elecraft] Latest Sherwood table > I wonder how such a high performance filter would work in the K3? Not that its needed in the K3. However in the interest of science, it might be a worthy pursuit. It also might push the K3 well ahead of the FT5000 in ultimate performance. Not very well since it's at 70 MHz. ;-) The Inrad filters are already better than whatever is in the FT5000 since Sherwood measured ultimate rejection in the K3 at 105 dB vs 90 dB for the 5000. 73, Bill W4ZV ______________________________________________________________ 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 ______________________________________________________________ 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
