Hi Martin,
Martin Ewing wrote:
Lin,
I'm all in favor of a higher stability oscillator. Don't know if my
enthusiasm stretches to $135, though!
A couple of features I would be interested in for the oscillator:
1. Electrical trimming, so you can tweak the setting via an external
voltage (pot.) Unfortunately, the electrically trimmed oscillators
seem to have significantly worse phase noise, and that might be
unacceptable.
It is electrically trimmed. Here's the trim app note:
"http://abracon.com/Support/AOCJY Vref App Note.pdf "
and phase plots are here:
"http://abracon.com/Precisiontiming/AOCJY Typ Phase Noise Plots.pdf"
Remember that this clocks a DDS. The highest output is 9.425, so
20*log(44.55/9.425) - so at the least, there's an extra 13.5 db
reduction of the phase noise from the oscillator.
Also, there is this nice write-up on Ten-Tec's site:
/radio.*tentec*.com/file_download/114/566_syn_article.pdf/
2. Phase lock to external (10 MHz) standard. This is particularly
good for VHF / microwave folks.
Can be done using appropriate PLL circuitry.
I don't expect we're going to get all these features from a vendor at
a reasonable price. I do think it's a shame that TT didn't pay a few
bucks more for a better TCXO as standard equipment. Maybe someone
will home brew a solution?
That's what I'm attempting here.
73 Happy New Year
Martin AA6E
p.s. Thanks for the link to my blog post. I checked it out and found
that all my figures had been wiped. They are now restored for your
viewing pleasure!
No problem!
Lin,
WB1AIW
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