Wayne,
thank you for your clarification. That was something that appeared very
strange to me while looking at the graphs, and was thinking if it was some
sort of mistake. Probably many people had my same thoughts.
Unfortunately the QST paper copies can't be fixed, and this will generate
some confusion in the next weeks. The same for the MDS issue.
Anyway, thanks for the clarification! I have one more reason to upgrade my
synthesizers now, and I'll do that as soon as I have one excuse for a trip
to the USA :)
Ciao, 73
Fabio
IZ4AFW / IO4W / NZ1W
2015-10-20 2:03 GMT+02:00 Wayne Burdick n...@elecraft.com [Elecraft_K3] <
elecraft...@yahoogroups.com>:
>
>
> 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
>
>
> __._,_.___
> ------------------------------
> Posted by: Wayne Burdick <n...@elecraft.com>
> ------------------------------
> Reply via web post
> <https://groups.yahoo.com/neo/groups/Elecraft_K3/conversations/messages/25309;_ylc=X3oDMTJybGJ1bzhoBF9TAzk3MzU5NzE0BGdycElkAzIwMTQ5NDI4BGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAMyNTMwOQRzZWMDZnRyBHNsawNycGx5BHN0aW1lAzE0NDUyOTk0MTM-?act=reply&messageNum=25309>
> • Reply to sender
> <n...@elecraft.com?subject=Re%3A%20QST%20Review%20of%20KSYN3A%20synth%20has%20erroneous%20TX%20phase%20noise%20plot>
> • Reply to group
> <elecraft...@yahoogroups.com?subject=Re%3A%20QST%20Review%20of%20KSYN3A%20synth%20has%20erroneous%20TX%20phase%20noise%20plot>
> • Start a New Topic
> <https://groups.yahoo.com/neo/groups/Elecraft_K3/conversations/newtopic;_ylc=X3oDMTJmODU0Y3JqBF9TAzk3MzU5NzE0BGdycElkAzIwMTQ5NDI4BGdycHNwSWQDMTcwNTA2MzEwOARzZWMDZnRyBHNsawNudHBjBHN0aW1lAzE0NDUyOTk0MTM->
> • Messages in this topic
> <https://groups.yahoo.com/neo/groups/Elecraft_K3/conversations/topics/25309;_ylc=X3oDMTM3NjcyczVlBF9TAzk3MzU5NzE0BGdycElkAzIwMTQ5NDI4BGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAMyNTMwOQRzZWMDZnRyBHNsawN2dHBjBHN0aW1lAzE0NDUyOTk0MTMEdHBjSWQDMjUzMDk->
> (1)
> Visit Your Group
> <https://groups.yahoo.com/neo/groups/Elecraft_K3/info;_ylc=X3oDMTJmazJ2bWVsBF9TAzk3MzU5NzE0BGdycElkAzIwMTQ5NDI4BGdycHNwSWQDMTcwNTA2MzEwOARzZWMDdnRsBHNsawN2Z2hwBHN0aW1lAzE0NDUyOTk0MTM->
>
> - New Members
>
> <https://groups.yahoo.com/neo/groups/Elecraft_K3/members/all;_ylc=X3oDMTJnaGEzNTQwBF9TAzk3MzU5NzE0BGdycElkAzIwMTQ5NDI4BGdycHNwSWQDMTcwNTA2MzEwOARzZWMDdnRsBHNsawN2bWJycwRzdGltZQMxNDQ1Mjk5NDEz>
> 15
> - New Photos
>
> <https://groups.yahoo.com/neo/groups/Elecraft_K3/photos/photostream;_ylc=X3oDMTJnbzF1OHVnBF9TAzk3MzU5NzE0BGdycElkAzIwMTQ5NDI4BGdycHNwSWQDMTcwNTA2MzEwOARzZWMDdnRsBHNsawN2cGhvdARzdGltZQMxNDQ1Mjk5NDEz>
> 5
>
> [image: Yahoo! Groups]
> <https://groups.yahoo.com/neo;_ylc=X3oDMTJlc2o4b205BF9TAzk3NDc2NTkwBGdycElkAzIwMTQ5NDI4BGdycHNwSWQDMTcwNTA2MzEwOARzZWMDZnRyBHNsawNnZnAEc3RpbWUDMTQ0NTI5OTQxMw-->
> • Privacy <https://info.yahoo.com/privacy/us/yahoo/groups/details.html> •
> Unsubscribe <elecraft_k3-unsubscr...@yahoogroups.com?subject=Unsubscribe>
> • Terms of Use <https://info.yahoo.com/legal/us/yahoo/utos/terms/>
>
> .
>
> __,_._,___
>
______________________________________________________________
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
Message delivered to arch...@mail-archive.com
