[time-nuts] Oscillators and Ovens

Bob Camp kb8tq at n1k.org
Sun Nov 12 11:31:48 EST 2017


I would say there are *very* few companies out there that will 
sell you high grade  precision OCXO crystals in single piece quantities.  
I think  you would get one much quicker and cheaper by pulling it out 
of an eBay OCXO. You can do good far removed phase noise with 
a lot of crystals. Once you look close in, the performance of the 
resonator matters. ADEV is the same issue, longer Tau’s are very
resonator dependent. 


> On Nov 12, 2017, at 10:14 AM, Attila Kinali <attila at kinali.ch> wrote:
> Hi Jim,
> On Wed, 1 Nov 2017 11:39:32 -0700
> jimlux <jimlux at earthlink.net> wrote:
>> So, it would be nice to have a *cheap* lowish power packaged part that 
>> has the Q of an OCXO, but without the power consumption of the oven 
>> (typically measured in watts).
>> yeah, I'd be operating it *way* far from the optimum turnover temp, so 
>> the tempco might be huge (in oscillator terms), but I don't really care 
>> - in fact, that might give me a way to measure the temperature of the 
>> system.
> Have you tried to build your own oscillator? There are a few companies
> that still sell single crystals. If you could piggy pack on some bigger
> customers production, you should be able to get the crystals relatively
> cheap. All you then have to do is to design an approriate, low noise
> oscillator. If you can relax your frequency specs, ie if you don't care
> if you are off by a few ppm, then you could scavenge the rejected crystals
> from said big customer.
> 				Attila Kinali
> -- 
> You know, the very powerful and the very stupid have one thing in common.
> They don't alters their views to fit the facts, they alter the facts to
> fit the views, which can be uncomfortable if you happen to be one of the
> facts that needs altering.  -- The Doctor
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