[Elecraft] Noise Power Ratio and the K3 with new synthesizer?

[Rick Stanback]

I just completed the build of my KAT500 and KPA500 and I had the
following issues.

The KAT500:
the software was very flaky trying to connect to the KAT. I run Fedora
21 so it might be the bleeding edge Linux.  I did finally get the
connect and hit the optimize for KPA500 button.  I am still not able to
hit the tune button on the KAT500 and get the K3 to xmit and tune.  If I
hit the button and then hit the tune button manually on the K3 it tunes?

KPA500:
When I first powered up the display would say KPA500 for a bit then
Invalid??  Then if I put the amp to oper it would immediately get the
270v fault.  I took it apart and inspected all the connections including
the ribbon cables and although I did not find anything out of place or
not seated when I put it back together it seems to just work?  I have
made a few contacts and everything seems to be OK.  The amp follows the
K3 band with no problems.


-- 
Rick Stanback (N4WCQ)
"Chance only favors the prepared mind. Louis Pasteur"


On Thu, 2015-03-12 at 14:08 -0400, Scott Manthe wrote:
> I suspect that the "Noise Power Ratio" test was used because that is the 
> only test that Adam could use to get his beloved Icom gear near the top 
> of the list. Mr. Farson has had a website devoted to Icom gear for many 
> years, so I'm not sure if this test could be considered even remotely 
> objective.
> 
> Here is a NPR tutorial from another source, for those interested and 
> technically proficient enough to investigate further.
> 
> 73,
> Scott, N9AA
> 
> On 3/12/15 10:53 AM, Chip Stratton wrote:
> > Adam Farson VA7OJ has an article in the current March/April 2015 QEX
> > discussing the use of Noise Power Ratio (NPR) to help define a
> > receiver's performance in a crowded band in a way that might be more
> > illuminating than the simpler two tone tests. Its an interesting
> > discussion which makes some sense, but then I'm not anywhere close to
> > an expert in that field.
> >
> > In any event, he has figures from a number of transceivers, including
> > a couple of K3s which no doubt do not have the new synthesizer. The
> > K3s still performed very well relative the the rest of the field in
> > these tests, though they were slightly behind the IC-7700, IC-7800,
> > and TS-590S.
> >
> > Which of course makes me wonder how the K3 with new synthesizer would
> > perform in this arena?
> >
> > >From a guy with a mild metrology addiction...
> > Chip
> > AE5KA
> >
> 
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