> On Dec 12, 2014, at 10:53 PM, [email protected] wrote: > > Hi Bob, >> or 1x10^-8 per volt. If it’s a 10 MHz OCXO. >> That would be 1x10^-14 per uV >> 4.7 x 10^-13 for 47 uV > Good, so I'm not out to lunch here. ;) Thanks for verifying those > numbers for me! > >> What makes you believe that the OCXO’s temperature performance it > not the issue? > Because I can blow a hair dryer on it, and make very warm - almost > hot to the touch and not see the phase or DAC change. Yet 2 degree > thermal cycles in the room show up in the DAC and phase. I'm pretty > sure it's not the OCXO, but if you know anything that would suggest > otherwise, please do share. >
I’ve been through the math multiple times. I’ve compared your OCXO’s to the data on best parts on the market. Let’s see: You claim you are heating up the OCXO by 30 C or so. The frequency must be below 4x10^-13 to be below your other effect. If so, your OCXO would do < 3x10^-12 over -40 to +85. That is not possible with an OCXO. What is the part number on the OCXO you are using? Who made the OCXO? Is there a spec sheet on the OCXO or a similar part from the same outfit? Dig in a bit and you will have a very hard time finding parts that are as good as the numbers I’ve been using. Bob _______________________________________________ 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.
