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

[Brian Hemmis]

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> 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> 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!
>> 
>> 
>> 
>> 
>> 
>> 
>> --
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>> Sent from the Elecraft mailing list archive at Nabble.com.
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