[time-nuts] Re: HP Z3801A - Dead GPS Receiver - Oncore VP

[Bob kb8tq]

Hi

The stability profile of the GPS timing signal changed significantly when SA was turned off. 
Things like sawtooth correction that didn’t make much difference in the 1990’s now did 
make a difference. Time constants and OCXO parameters that made sense “before” didn’t 
make sense “after”. 

More or less: When you make profound changes in the GPS timing signal, the best approach 
to accurately recovering that signal has to change to match the new signal. Does everybody
change everything the next day? Of course not. It takes a while for folks to work out what’s
what with the “new rules”. 

Bob

> On Oct 14, 2021, at 8:12 PM, Hal Murray <halmurray+timenuts at sonic.net> wrote:
> 
> 
> kb8tq at n1k.org said:
>> The other way to look at it: The Z3801 and it???s kin basically went obsolete
>> in 2000 when SA was turned off. Once that happened, the design approach
>> changed.
> 
> Could you please say more.  What changed in the design approach?
> 
> Can I tell the difference by looking at a box?  Or poking at the serial port?
> 
> 
> 
> -- 
> These are my opinions.  I hate spam.
> 
> 
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