Yes indeed. Checking for birdies or any such with an unterminated antenna jack is invalid. You can terminate with a dummy load, or more practically with an antenna listening to normal band noise.
73, Guy K2AV On Tuesday, June 23, 2015, Brian Hemmis <[email protected]> wrote: > David, Your friend states there are 2 dozen birdies on 6 meters with the > antenna DISCONNECTED. This tells me nothing. Please tell him to connect a > RESONANT 6 meter antenna to the radio then tell me how many birdies he > hears. > 73, Brian K3USC > > > > On Jun 23, 2015, at 1:41 PM, Wayne Burdick <[email protected] > <javascript:;>> wrote: > > > > David, > > > > When we designed the K3S, we very carefully evaluated internally > generated spurs on all bands. We found that the KSYN3 and KSYN3A had > roughly the same number. This is consistent with both being high-level > signal sources; you can't get rid of spurs entirely. All but a very few are > masked by band noise, as well. > > > > 6 meters was no exception. Both the old and new synths show some spurs > on this band, and we adjusted PLL divider ratios, etc., to minimize them. > But the new synth -- in our tests -- doesn't have any more than the old. I > use a pair of the new synths in my lab K3S, as well as the KXV3B, which > includes premamp 2 (-145 dB MDS). I've had no problem with spurs on 6 > meters. > > > > In some cases, it could come down to how the cables are oriented. Make > sure you're orienting the cables as described in the manual, and if you > feel that you have excessive spurs, email customer support. If we come up > with any improved cable routing, we'll post to the list. > > > > 73, > > Wayne > > N6KR > > > > > > On Jun 23, 2015, at 8:52 AM, Dave G3WGN M6O <[email protected] > <javascript:;>> wrote: > > > >> Is there anyone out there yet who has done a detailed study of 6m > birdies with the new synth and either external or internal preamp? A good > friend with an early K3 is reluctant to upgrade to K3S as he hears a couple > of dozen birdies on 6m with antenna disconnected. > >> So how has this aspect of K3 performance evolved from early K3 (his is > S/N sub-100) to the K3S? > >> 73 > >> David G3WGN M6O > >> Member of the 6Gs team at E6GG in September 2015 www.e6gg.com< > http://www.e6gg.com> > >> Work us on as many bands as you can! > >> > >> > >> > >> > >> > >> > >> -- > >> View this message in context: > http://elecraft.365791.n2.nabble.com/6m-birdies-and-K3S-and-or-new-synth-boards-tp7604211.html > >> Sent from the Elecraft mailing list archive at Nabble.com. > >> ______________________________________________________________ > >> Elecraft mailing list > >> Home: http://mailman.qth.net/mailman/listinfo/elecraft > >> Help: http://mailman.qth.net/mmfaq.htm > >> Post: mailto:[email protected] <javascript:;> > >> > >> 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] <javascript:;> > > > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[email protected] <javascript:;> > > > > 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] <javascript:;> > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] <javascript:;> > > 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] <javascript:;> > -- Sent via Gmail Mobile on my iPhone ______________________________________________________________ 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]
