Hi Most charts show the temperature coefficient going through zero around 5V and passing 2 mV/C in the vicinity of 6V.
Bob > On Nov 18, 2014, at 12:10 PM, Richard (Rick) Karlquist > <[email protected]> wrote: > > > > 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. _______________________________________________ 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.
