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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