....and I have an Ebay special GPSDO, which is ridiculously accurate.
But I
don't know how pure it is.
- Jerry KF6VB
On 2022-06-07 17:14, Wes wrote:
Sure, but how do you quantify the "relatively pure" source if you
build one? Typically you want it to be 10 dB better than what you are
measuring (or the measuring instrument).
The other option is a commercial source with published specs. For
example I have an ebay special Morion MV89 10 MHz OCXO that is
specified at -150 dBc/Hz at 1 kHz offset, which is way better than you
could measure with a spectrum analyzer technique.
Wes N7WS
On 6/7/2022 2:12 PM, jerry wrote:
On 2022-06-07 13:56, Wes wrote:
*plus* the phase
fluctuations in the measurement system's oscillators and/or sampling
clock jitter. This is the K3/P3.
*** I wonder if the noise of the K3/P3 could be measured using a
relatively pure
signal source - then once that's known, you would subtract the K3/P3's
noise from the
total noise measured from the DUT.
I had a book somewhere with plans for a really clean
single-frequency signal source. It used several
identical crystals; one as an oscillator and then some more as a
filter to clean it up.
- Jerry KF6VB
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