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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