[Elecraft] Re: KPA100 RS 232 Interface

[Wayne Burdick]

Gary,

Thanks for your sentiments on this. As internal true-RS232 interfaces
go, we do feel that ours is pretty unobtrusive. Certainly our
high-frequency DC-DC converter is a huge improvement over the use of
200-kHz on-chip converters, which can trash large parts of the low bands
in particular. 

However, even though the remaining birdies are weak, we'd like to
eliminate them if possible. We've put together a more comprehensive list
of possible approaches and will report back to the group.

73,
Wayne
N6KR


Gary Hembree wrote:
> 
> >Just wondering if anyone else besides me has a noticable spur at 14030(+/-)
> >being generated by the RS232 stuff. Whenever I plug the cable into the K2
> >and any other computer . . .
> 
> This is an old story.  Check the archives from about a year ago.  Tom,
> N0SS, and others including myself chased these birdies for a while.  The
> worst for me was at 18.100 MHz at about S5.  Luckily I'm not interested in
> that frequency.  Most vanish into the ambient suburban power line and
> consumer digital noise storm here, including all of them on 20 meters.  Not
> a real problem, unlike some other transceiver brands that I've used.  Your
> experience can be different of course.
> 73
> Gary, N7IR
> DM43bi