[time-nuts] tube GPS receivers

[Bob Camp]

Hi

AC137 doesn't ring any bells. True tube core (no solid state at all) isn't something that was dimensioned in K words. A couple hundred words was pretty big stuff. "Quite a bit" of core done that way is a lot of tubes. As the number of tubes goes up, the time to failure comes down….. hours … minutes … who knows.

Bob

On Jun 22, 2013, at 9:14 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> Hi Bob,
> 
> On 06/23/2013 02:35 AM, Bob Camp wrote:
>>>> How accurate?? Resolvers are good to about 16 bit accuracy, so I guess 1
>>>> part in 60,000. if the orbit circumference is 163 Mm, then a resolver
>>>> can determine the position to a few km.
>>>> However, I don't know that that is good enough. If you need to know to 1
>>>> chip at C/A code rates, 1 microsecond, that's a pretty small fraction of
>>>> one 12 hour rev of 43200 seconds. But maybe not.
>>> 
>>> Hmm. You could tabulate it even. It would be quite a bit of core-memory,
>> 
>> Core and tubes??? Hmmm…..
> 
> We could get you some AC137 to play with if you want...
> 
> Cheers,
> Magnus
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