[Elecraft] KTCX03-1 high stability reference oscillator

[Edward R Cole]

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
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