[time-nuts] True Position GPSDP + Rb X72
KA2WEU at aol.com
KA2WEU at aol.com
Sun Sep 24 08:50:10 EDT 2017
Meaning home=home ? just kidding. ,long staying constant
73 de Ulrich
In a message dated 9/24/2017 8:45:35 A.M. Eastern Daylight Time,
magnus at rubidium.dyndns.org writes:
On 09/24/2017 02:30 PM, Bob kb8tq wrote:
>> On Sep 23, 2017, at 9:39 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
>> kb8tq at n1k.org said:
>>> If the main use is feeding test gear (and not direct synthesis) an Rb
>>> pretty well. Most instruments assume a dirty reference signal and
>>> up internally.
>> What's the bandwidth on the typical cleanup PLL? How well does that
>> the noise from a Rb?
> It’s like any other PLL with noise involved. You look at the noise of
the Rb, the
> noise of the particular cleanup oscillator, and your system
requirements. In some
> cases that comes out to a few seconds. For Time Nut grade with a really
> OCXO you are at some pretty long numbers.
> If the Rb starts at 2x10^-11 at 1 second and goes down by square root
> 100 seconds you are at 2x10^12. Still not as good as a really good OCXO.
> 10,000 seconds you might get to 2x10^-13 (but probably will not). Your
> likely will climb out of the “parts in 10^-13” range before 10,000
> Lots of fun.
Once up on a time, you could order the OSA cesiums width different
oscillators, essentially to buy into different balances between
oscillator cost and performance. The time constant is adapter with
regards to oscillator type, as the trade off shifts.
I can't recall any other cesium or rubidium that did this, but HP
upgraded oscillators at one point for this reason too.
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