On 3/12/16 7:35 AM, Bob Camp wrote:
Hi
The conventional MCXO uses an AT cut crystal rather than an SC. It
runs on the fundamental and the third overtone. You can build one
with just about any normal fundamental crystal. There are also people
doing OCXO’s sort of the same way. Back when the MCXO came out, it
was about the only way to get a TCXO that had < 1x10^-8 sort of
stability. Now you can get that with a cheap (as in not $5,000 each)
commercial IC based TCXO.
And heck, if you can tolerate the 1.5W warm up power, you can get ppb
sorts of accuracy in a OCXO at 250mW. (Vectron EX421) They're a few
hundred dollars.
The Qtech MCXO is about 100 mW, and somewhat bigger than the EX421 (not
much bigger)
The vectron MX-503 is in the 50 ppb range at 40 mW (I don't know how it
does the internal compensation.. maybe it uses some other kind of
temperature sensor)
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