That's OCXO, oven controlled crystal oscillator. Why X for crystal?
Christ if I know. There's a great article at
http://en.wikipedia.org/wiki/Crystal_oscillator
that includes a table of abbreviations you can refer to.
Cheers,
Dave Hart
X is easier to write than "Crys" and it's shorter in Morse code as well!
Likely from the earlier days of radio when many abbreviations and codes
were used. 73 = best wishes.
73,
David
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