I ordered my K3S with the optional KTCX03-1-F which the description
shows "1 ppm f/w correction to 0.5 ppm, factory installed".
In 3+ years of use, I check the calibration on a monthly basis. I find
it to be always better than +/- 1 Hz at 10 MHz. I have adjusted the
Ref Osc as needed. I find it to be well worth the addition.
73
Bob, K4TAX
On 5/20/2019 9:30 AM, Edward R Cole wrote:
Elecraft specs from my 2010 K3:
TCXO01 = +/- 5ppm for 0 to 50c
TCXO03 = +/- 1ppm
But I recall Wayne stating the TCXO03 actually does close to 0.5 ppm
At 28-MHz 5ppm = 140 Hz, 1ppm = 28 Hz, 0.5ppm = 14 Hz
I installed the EXREF on my K3 with an external OCXO 10-MHz standard.
At 28-MHz I measure +/- 1.5 Hz (counter toggles between 1-Hz and 2-Hz
offset) with the TCXO03. It would be 7.5 Hz using the TCXO01.
Since I operate digital eme on frequencies up to 10-GHz this is useful.
73, Ed - KL7UW
http://www.kl7uw.com
Dubus-NA Business mail:
[email protected]
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