On 11/17/2014 5:54 PM, Bert Kehren via time-nuts wrote:
I ground one side of the tuning diode and use the 2 to 12 V as the external OCXO for my FRK's along with increasing the time constant. I have not verified it but I think removing the zener Voltage should also improve ADEV. Bert Kehren
The choice for the Zener diode came from my old boss at HP, who was very knowledgeable about using discrete zener diodes as low noise references. According to him, this particular part number has very respectable noise. This is just something you have to know experientially, there is no theory of zener noise AFAIK. You might try measuring the noise of the 6.2V reference voltage directly at baseband, and then multiplying by the 1 Hz/volt sensitivity. Let us know your results. Rick Karlquist N6RK (Now retired from HP/Agilent/Keysight) _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
