Hello,
I asked for a 3 corner hat measurement for phase noise.
Managed to work it out myself.
In case anyone else wants to know:
First of all Timepod does do it but only for Allan Deviation.
But I wanted it for phase noise.
So if you make three phase noise measurements A vs B (call result X), A vs C
(call result Y), B vs C (call the result Z)
So you have three results X, Y, Z in dB.
Then you do the following.
Divide the dB by 10
Antilog them
Then Osc A = (X+Y-Z)/2
Osc B = (X+Z-Y)/2
Osc C = (Y+Z-X)/2
Then log10 the above three results
Then multiply by 10 to get back to phase noise in dB.
So I made three measurements and got -115 dB, -114 dB and -113 dB
The individual phase noise of each oscillator worked out to
be -119.72, -116.78 and -115.35
The results are only accurate when the 3 oscillators are within 3 to 5 dB of
each other, so its just an approximation.
Regards
Martyn
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