Hello Wayne Would like to view both ARRL (old v new) synth plots side by side if possible! Don't subscribe to ARRL, so not privy to that info!!
Ken.. G0ORH - M3i Sent from my iPad > On 20 Oct 2015, at 01:03, Wayne Burdick <[email protected]> wrote: > > Hi all, > > You may have noticed that QST recently reviewed the K3's performance > before/after swapping in a new KSYN3A synthesizer. While the review text was > accurate (and complimentary), there was a significant error in the KSYN3A TX > phase noise plot (Figure 10). This error made it appear as if the original > synthesizer had lower (better) wide-spaced phase noise than the KSYN3A > (starting where the plot lines cross), which is not the case. > > We should have caught this ourselves before the article went to print. We > greatly appreciated the League's efforts to determine the source of error -- > equipment setup -- and re-test. The digital-print version of QST will be > corrected, and a correction will also appear in the December QST. > > The ARRL sent us the revised TX phase noise plot for the K3+KSYN3A that they > tested. You can see it here: > > > http://www.elecraft.com/specs/Joel's%20K3%2010-19-15%2020%20meter%20phase%20noise.BMP > > In addition they're testing a K3S. Its TX phase noise plot looks as good or > slightly better: > > > http://www.elecraft.com/specs/K3S%2010-19-15%20%2020%20meter%20phase%20noise.BMP > > These plots (used with permission) were for 20 meters, and are also > representative of the other bands, including 6 meters. The bottom line is > that the K3S, or a K3 with a KSYN3A, has extremely low phase noise at both > close and narrow spacings. In the case of narrow spacings, the new synth also > significantly improves the RMDR (reciprocal mixing dynamic range) over the > original, as described in the article. > > Note that the above plots show *transmit* phase noise. In receive mode, phase > noise with the new synth is even lower, especially at close spacings (under 3 > kHz from the carrier). > > There's one other measurement in the QST review that needs a disclaimer. As > you may know, the KSYN3A allows the K3 (or K3S) to be tuned down to as low as > 100 kHz, thus including the 137 kHz band. The review showed an MDS of -44 dBm > at this frequency, while in fact it is more like -115 dBm. It appears that > the K3 under test didn't have the RF board modification required, or the > modified KBPF3A filter module. > > 73, > Wayne > N6KR > > > ______________________________________________________________ > 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 > Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected]
