[Elecraft] Choice of signal source for KX3 extended temperature calibration?

[Phil Genera]

I'ts been a while, but I did this just fine with the 50mhz harmonic from
the thunderbolt.

-- 
Phil
W1JV


On Thu, May 2, 2019 at 8:00 PM Bob McGraw K4TAX <rmcgraw at blomand.net> wrote:

> I'd hang a 1N914 diode across the output of the Siglent generator and
> tune it to 25 MHz.  The 2nd harmonic should be strong enough.
>
> 73
>
> Bob, K4TAX
>
>
> On 5/2/2019 5:26 PM, Frank O'Donnell wrote:
> > Which of the following two signal sources would enable the best
> > results from the KX3's extended temperature calibration?
> >
> > --Elecraft's XG50 board, which puts out 49.380 MHz ± 5 ppm.
> >
> > -- Siglent SDG 2042X waveform generator, with input from a Trimble
> > Thunderbolt GPSDO. Maximum frequency on the Siglent is 40 MHz.
> >
> > The calibration instructions call for using a signal source close to
> > 50 MHz. Is 40 MHz close enough? The XG50 is much closer to 50 MHz,
> > whereas the Siglent/Trimble potentially has the capability of being
> > considerably more accurate. I'm interested in squeezing as much
> > frequency stability out of the KX3 as possible.
> >
> > Thanks and 73,
> >
> > Frank O'Donnell K6FOD
> >
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