[Elecraft] KTCX03-1 high stability reference oscillator

[Bob McGraw K4TAX]

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:
>   dubususa at gmail.com
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