[time-nuts] GPS jump

Bob Camp kb8tq at n1k.org
Sat Oct 11 11:08:10 EDT 2014


Hi

To the extent that anything *is* locked, it’s been done for a lot longer than the 1980’s. Long before common view GPS, Loran-C observations (and corrections via clock trips) were used. You can look at it as a PLL, just a *very* fancy one with *very* long time constants. 

Bob

On Oct 11, 2014, at 10:59 AM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> Hal,
> 
> On 10/11/2014 08:49 AM, Hal Murray wrote:
>> 
>> gigneil at gmail.com said:
>>>  Is it actually possible to phase lock two oscillators together cross the
>>> distance from DC to Colorado Springs? (2400 kilometers or so). ?
>> 
>> I think so - if your clocks are stable enough.
>> 
>> There is probably a simple rule for PLL stability based on round-trip-time
>> and bandwidth (and other factors).
>> 
>> 
> 
> Actually, the problem of mutual lock over distance was solved and described in the 80thies.
> 
> I can dig up the article reference from one of my books if needed.
> 
> Cheers,
> Magnus
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