On 10/6/07, Jim Lux <[EMAIL PROTECTED]> wrote:
>
>
> >
> >*(Sherwood) "Phase noise does not fall off at 6 dB per octave as
> expected.
> >Flex believes the present phase noise limitations are caused by A/D
> >clock jitter". ("Clock jitter" is another word for phase noise).
> >
> >In this case the K3 has the advantage, since its phase noise
> >integrated over the entire spectrum will be lower. The 5000's relatively
> >higher phase noise will likely be an issue, especially for VHF users.
>
>
> Perhaps what Rob is measuring isn't actually phase noise? What's the
> measurement methodology? I note the K2 also doesn't show the 1/f^2
> characteristic (going from 10 to 100 kHz goes from -136 to -144, not
> the 20 dB one might expect)
Rob is/was on this list so I'll let him respond re his methodology.
Whatever it is, he's been doing it for years and all his other measurements
show decreasing phase noise with increasing frequency offset. BTW the data
is for the K3...not the K2. Here are a couple of other interesting comments
from the K3 designers on Elecraft list:
http://mailman.qth.net/pipermail/elecraft/2007-October/074865.html (KK7P DSP
designer)
http://mailman.qth.net/pipermail/elecraft/2007-October/074866.html (N6KR
co-owner)
73, Bill W4ZV
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