[time-nuts] Linear voltage regulator hints...
Bob Camp
kb8tq at n1k.org
Sat Dec 13 13:53:01 UTC 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.
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
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