[time-nuts] Papers on timing for lunar laser ranging
jimlux at earthlink.net
Fri Jul 7 19:14:41 EDT 2017
On 7/7/17 3:14 PM, Hal Murray 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 1960â€™s and you are up
>> into the â€œseveral new carsâ€ range. Even for NASA projects cost did make it
>> into the equation â€¦.
Note that these papers are talking about optical ranging to the
reflectors left on the moon by the Apollo missions, but the actual work
was being done recently (e.g. it's a Microsemi 5071 Cesium clock)
> When was the first GPSDO shipped as a commercial product?
An interesting question - at least 20 years ago - XL-DC manual, Rev E,
> 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.
My mid 2000s 10 MHz OCXOs from Wenzel have both EFC and a manual
adjustment of some sort (I'm not sure what's under the little cap on the
side.. a trimmer cap or something?)
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