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

[Magnus Danielson]

Hi,

Well, designs from before SA off did get better performance, even if not 
optimum for the new condition. As they where installed, it did in itself 
not cue for a shift, but rather, as the equipment it was installed with 
was tossed, these receivers could be salvaged and used on their own. It 
would be neat to see how that installation actually looked, because it's 
pulled from some chassi and I've never seen how that setup really looked 
and was wired.

Other receivers where not integrated the same way, so they would have 
longer operational life.

Cheers,
Magnus

On 2021-10-15 02:35, Bob kb8tq wrote:
> 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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