[time-nuts] The "NAKED" 5065A optical unit

Mark Goldberg marklgoldberg at gmail.com
Tue Feb 20 11:36:49 EST 2018


On Tue, Feb 20, 2018 at 2:30 AM, Poul-Henning Kamp <phk at phk.freebsd.dk>
wrote:

> If that is the case, I think it will make sense to give the lamp
> its own adjustable voltage regulator (LM317), so the power can be
> reduced to what is optimal/necessary without having to take the
> lamp apart and change a resistor.
>

I don't know anything about these devices, but for TCXOs, the power supply
noise significantly affects the phase noise of the output. An LM317 is not
well specified for noise and I expect is is orders of magnitude worse than
something like an LT3042 low noise regulator.

Regards,

Mark


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