[time-nuts] oscillators

Bob Camp lists at rtty.us
Fri Aug 31 01:12:10 UTC 2012


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.


On Aug 30, 2012, at 8:01 PM, Jim Lux <jimlux at earthlink.net> wrote:

> On 8/30/12 9:33 AM, Bob Camp wrote:
>> Hi
>> The fundamental / third approach is one of several possible ways to go. You
>> can also run an SC on the B and C modes to get thermometer data. Early
>> implementations used a pair of independent blanks, one cut to be a good
>> thermometer. Some have even gone as far as to mount a thermistor on the
>> crystal.
> I've used the "sensor on oscillator can" technique very recently on a software defined radio.  Over the next year, I'll get some data on how well it works in use.  The idea is to use a low power TCXO and a sensor, rather than an OCXO, to meet a fairly tight frequency requirement (a few hundred Hz out of 2 GHz)  The TCXO can get you do a few ppm or better. The sensor should let me get about an order of magnitude better, and I need to measure the temperature anyway, and it's easy to integrate with the software waveform code.
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