[Elecraft] 6m birdies and K3S and/or new synth boards

[Guy Olinger K2AV]

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 <bhemmis at mac.com> 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 <n6kr at elecraft.com
> <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 <david at aslinvc.com
> <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.
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