[time-nuts] ok, newbie questions
J. Forster
jfor at quik.com
Fri Nov 26 23:43:28 UTC 2010
> Ahh. Very interesting explanation. So is it somewhat correct to assume
> (yes,
> I know) that for a stationary (non-mobile) environment, these extra sats
> dont make much difference? This seems to be what the explanation is
> saying.
Pretty much, although if your view of the satellites is obscured and you
can't cut trees, the extra birds capability might help some.
> Ok. So let me see. For a frequency standard for use in lab equipment, it
> appears that short term, phase noise and other sources of noise are the
> things to be concerned with to get better results. These seem to really
> be accomplished with a good oxco.
Yes.
However, if I want a very accurate
> time-of-day clock for long periods of time, then I need long term
> stability which is where the GPS comes in. Do I have this right?
Yes.
> So if I want a really souped-up freq standard for my lab, then I should
> concentrate on finding the best oxco I can (which may be disciplined by
> the
> GPS or manually occasionally calibrated to GPS), and use the best power
> supply I can find. These seem to be what I should concentrate on rather
> than more channels.
Yes, and a distribution amp that has good reverse isolation and low phase
noise.
> I do believe that I read some stuff on the internet that the HP GPS DO's
> do
> seem to have very good power supplies (or converters) which contribute to
> low spurs. So it seems the HP's do have a real advantage (not just the
> name).
Don't know.
> Thanks to everyone for the help (hope I am getting the idea here!)
>
> 73 Eugene W2HX
Best,
-John
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