[time-nuts] oscillators

Jim Lux jimlux at earthlink.net
Fri Aug 31 03:36:47 UTC 2012

On 8/30/12 6:29 PM, Magnus Danielson wrote:
> On 08/31/2012 03:12 AM, 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.
> I haven't seen that any of the TCXOs compensates for the temperature
> hysteresis. It would be cool if they did.

That is the dominant error source for changes over the 5-40C.. about 0.2 
ppm difference when going up from -55 to +85 and going down over the 
same range.

> The ability to handle temperature gradients can be troublesome for both
> TCXOs and OCXOs.
> TCXOs have become quite good these days.
> Cheers,
> Magnus
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