[time-nuts] Oscillator temperature compensation

[Max Robinson]

The university of Florida still owned, that's right owned, an IBM 709 when I 
was there 1960 through 1968.  I took a tour of it and punched a few cards to 
program it.

IBM didn't sell computers to anybody not even the feds but they sold this 
one.  That should have made the purchasing department at U of F suspicious. 
I think they ran it until 1970 when it was replaced by a 360.

Regards.

Max.  K 4 O DS.

Email: max at maxsmusicplace.com

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----- Original Message ----- 
From: "Hal Murray" <hmurray at megapathdsl.net>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Saturday, June 22, 2013 4:10 PM
Subject: Re: [time-nuts] Oscillator temperature compensation


>
> magnus at rubidium.dyndns.org said:
>> On 06/22/2013 05:27 PM, Didier Juges wrote:
>>> A real treat would be to do the GPS receiver with tubes ;)
>> The the correlation channel(s) would be possible to do in tubes. The rest 
>> of
>> the processing is "problematic".
>
> The IBM 709 was tubes.  (Well, mostly, they used transistors on the front 
> end
> of the memory.)  Memory was 32K 36 bit words.  Call it 128K bytes.  That
> might be enough.
>
> It had a cycle time of 12 microseconds.  12 ns would be 1000x as fast.
> That's 80 MHz, a reasonable speed for an ARM.  So the CPU in today's GPS
> systems is 300x to 1000x faster than the 709.
>
> Anybody know what fraction of an ARM it takes to do the GPS calculations?
>
> Do you have to keep up, or can you do the calculations for every N-th 
> second?
>
>
> -- 
> These are my opinions.  I hate spam.
>
>
>
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