[time-nuts] oscillators

Jim Lux jimlux at earthlink.net
Thu Aug 30 23:35:24 EDT 2012


On 8/30/12 6:12 PM, Bob Camp wrote:
> Hi
>
> If the temperature is varying slowly *and* there are no gradients you may get your order of magnitude over some range. You might be surprised at your TCXO. A lot of them are pretty darn good in the vicinity of room temp. You may already be an order of magnitude past your ppm or two for fairly normal temperature changes.
>

Temp does vary slowly (the radio weighs on the order of 6kg)..

Need to hold spec (in theory) from -20 to +40C.  The oscillator runs 
about 10 degrees hotter inside.

About 0.2 ppm from 5C to 40C.  +/- 1ppm worst case over the whole 
temperature range.

What I'm also interested in is whether I can compensate a non TCXO 66MHz 
CPU clock oscillator (even cheaper, potentially better phase noise with 
a higher Q crystal, etc.)




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