[time-nuts] Thermal impact on OCXO

Bob Camp kb8tq at n1k.org
Mon Nov 7 12:51:50 EST 2016


> On Nov 7, 2016, at 12:45 PM, Chris Caudle <chris at chriscaudle.org> wrote:
> On Mon, November 7, 2016 11:41 am, Chris Caudle wrote:
>> On Mon, November 7, 2016 11:20 am, Bob Stewart wrote:
>>> Either then OCXO is making up for the temperature change
>>> by increasing the temperature
>> Isn't that the entire point of an OCXO?
> Actually, that is not very precise language on my part.  The OCXO does not
> increase the temperature, it increases the heat input to the oven to
> counteract the decrease in ambient temperature, i.e. attempts to keep the
> internal oven temperature constant.

…. and as it does so, it pulls more current (or less) which changes the voltage
on the ground pin which hits the EFC reference which impacts things to a 
greater or lesser extent depending on the board layout.


> -- 
> Chris Caudle
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