Yes I was confused by that too, it appears that Leif has adjusted the TX noise figures from the QST dBc/Hz to a bandwidth of 500 Hz which is what QST use for RX measurements.
Leif has not actually measured the K3 or KX3, just used the QST results (the graph of "composite noise" and converted them for his purpose of showing differences between receiver and transmitter noise. He has measured the particular brand that exhibited very poor noise sidebands on transmit. David Anderson GM4JJJ > On 30 Dec 2013, at 14:34, Rick Stealey <rstea...@hotmail.com> wrote: > > >> >> With regard to SM5BSZ's SDR wideband-noise performance table >> (http://www.sm5bsz.com/dynrange/dubus313.pdf): > > > Something doesn't jive with the table in the above report. > I spot checked by looking up the Flex5000A in July 2008 QST, fig 3. > QST shows wideband noise never gets worse than -120dbc, although the report > says it is -77 at 350 KHz. > And (as I remember) the K3 report from QST showed phase noise way out at the > extremes of the meausrement dropping off much more than this author reported, > down into the range of -155 db. > > Am I reading something wrong? Apparently this report is not recent because > the worst performer of late (from QST measurements) has been the FT3000. > Too bad SM5BSZ didn't comment on it. > > Rick K2XT > > ______________________________________________________________ > 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 ______________________________________________________________ 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
