[time-nuts] Papers on timing for lunar laser ranging

Bob kb8tq kb8tq at n1k.org
Fri Jul 7 19:20:13 EDT 2017


Not in a commercial system ….


> On Jul 7, 2017, at 6:14 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> kb8tq at n1k.org said:
>> Consider that in 1974, I could buy a nice new car for less than what a
>> decent packaged 16 bit DAC cost.  Go back into the 1960’s and you are up
>> into the “several new cars”  range. Even for NASA projects cost did make it
>> into the equation …. 
> When was the first GPSDO shipped as a commercial product?
> There is an interesting tradeoff in GPSDO design.  With a specific DAC, you 
> can get finer steps if you reduce the tuning range.  Has anybody built one 
> with a reduced range and a knob on the side to adjust the center point of 
> that range?  You would have to adjust that knob occasionally as the crystal 
> you are tuning drifted.
> -- 
> These are my opinions.  I hate spam.
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