[time-nuts] Re: DIY Low offset Phase Noise Analyzer (Erik, Kaashoek)

[Bob kb8tq]

Hi

Setting a battery output to some exact voltage ( say 12.000 V ) is a bit exciting. 
OCXO performance in many cases *is* voltage dependent. You do want to run 
them at a constant / correct voltage as you characterize them.

Bob

> On Jul 15, 2022, at 3:53 PM, Dr. David Kirkby via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> On Fri, 15 Jul 2022 at 23:35, ed breya via time-nuts <
> time-nuts at lists.febo.com> wrote:
> 
>> 
>> Unfortunately, powering up the OCXOs and getting their signals connected
>> leads to some inevitable ground loops anyway, so you can't always take
>> full advantage of built-in isolation, but at least you have it. Try to
>> use it when you can.
>> 
>> The rest of the line and low frequency ground loop issues are hard to
>> predict, depending on the overall powering and operational setups, but
>> some general methods can be applied.
>> 
> 
> Would it not be worth running from NiCd batteries to eliminate PSU noise
> and conducted interference as a possible source. I believe NiCd have one of
> the lowest noises, bit no doubt Google would help.
> 
> I have a couple of high resistance meters (ie basically electrometers). A
> lot of the signals in that are optically coupled between boards.
> 
> Dave
> -- 
> Dr. David Kirkby,
> Kirkby Microwave Ltd,
> drkirkby at kirkbymicrowave.co.uk
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