[time-nuts] Linear voltage regulator hints...
kb8tq at n1k.org
Sat Dec 13 08:53:01 EST 2014
> On Dec 12, 2014, at 10:53 PM, dan at irtelemetrics.com 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.
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.
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