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

[Magnus Danielson]

Hi,

Yeah, I've seen the Lucent timing pair setup, and shipping cost was for 
sure involved into breaking it up into the modules and a cable.

Always nice to see how it all looked.

Cheers,
Magnus

On 2021-10-15 14:45, Bob kb8tq wrote:
> Hi
>
> There are ( or used to be ) pictures of the full up cell stations that stuff
> like the 3801 and it’s cousins went into. Just how much searching it
> would take to find them … who knows. My recollection of them is a
> very boring bunch of faceplates in a couple of side by side custom
> racks. Couple LED's here / connectors there, not a lot else.
>
> Back in the era when LPro’s were $30, the outfit that was selling the
> Lucent timing module with them in it would happily sell you the entire
> setup, shelter and all.
>
> Bob
>
>> On Oct 15, 2021, at 6:00 AM, Magnus Danielson via time-nuts <time-nuts at lists.febo.com> wrote:
>>
>> 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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