[time-nuts] What’s the BEST crystal?

[Bob kb8tq]

Hi

More than the cut, the packaging, resonator design, mount design, and processing of the crystal 
(in no particular order ) are what really make this or that crystal suitable for use in a precision OCXO. 
You can indeed find AT cut OCXO’s that do pretty well once they warm up ….

One wonders what the result would be of doing a large blank (> 50mm) 2.5 MHz 5th OT using modern 
design, packaging and mounting techniques. Given that it would take a rather large pile of nickels to 
find out (like > $50M worth), I very much doubt we ever will know the answer. 

Bob

> On Feb 29, 2020, at 1:05 PM, John Moran, Scawby Design <john at scawbydesign.co.uk> wrote:
> 
> Since the poor old SC cut crystal has been given such a kicking for its inconvenient placement of spurious responses, is there a better, or BEST crystal for putting in an oven and turning into a nice reference?
> 
> John
> 
> Cheers - John
> 
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